前置知识: 部署Kubernetes集群的方式
目前生产环境部署kubernetes集群主要由两种方式:
- kubeadm:
kubeadm是一个K8S部署工具，提供kubeadm init和kubeadm join，用于快速部署kubernetes集群。
- 二进制部署:
从GitHub下载发行版的二进制包，手动部署每个组件，组成kubernetes集群。
除了上述介绍的两种方式部署外，还有其他部署方式的途径:
- yum:
已废弃，目前支持的最新版本为2017年发行的1.5.2版本。
- minikube:
适合开发环境，能够快速在Windows或者Linux构建K8S集群。
参考链接:
https://minikube.sigs.k8s.io/docs/
- rancher:
基于K8S改进发行了轻量级K8S，让K3S孕育而生。
参考链接:
https://www.rancher.com/
- KubeSphere:
青云科技基于开源KubeSphere快速部署K8S集群。
参考链接:
https://kubesphere.com.cn
- kuboard:
也是对k8s进行二次开发的产品，新增了很多独有的功能。
参考链接:
https://kuboard.cn/
- kubeasz:
使用ansible部署，扩容，缩容kubernetes集群，安装步骤官方文档已经非常详细了。
参考链接:
https://github.com/easzlab/kubeasz/
- 第三方云厂商:
比如aws，阿里云，腾讯云，京东云等云厂商均有K8S的相关SAAS产品。
- 更多的第三方部署工具:
参考链接:
https://landscape.cncf.io/
一.K8S二进制部署准备环境
1.集群角色划分
| 主机名 |
IP地址 |
角色划分 |
| k8s-master01 |
10.0.0.241 |
api-server，control manager，scheduler，etcd |
| k8s-master02 |
10.0.0.242 |
api-server，control manager，scheduler，etcd |
| k8s-master03 |
10.0.0.243 |
api-server，control manager，scheduler，etcd |
| k8s-worker04 |
10.0.0.244 |
kubelet，kube-proxy |
| k8s-worker05 |
10.0.0.245 |
kubelet，kube-proxy |
| apiserver-lb |
10.0.0.240 |
apiserver的负载均衡器IP地址 |
2.所有节点安装常用的软件包
1.所有节点CentOS 7安装yum源如下:
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
curl -s -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
2.所有节点安装常用的软件包
yum -y install bind-utils expect rsync wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git ntpdate bash-completion
将软件包打包命令: (下面这条命令可以跳过，是我用于内网打包软件时使用的哈!)
mkdir 01-linux-env && find /var/cache/yum -name "*.rpm" | xargs mv -t 01-linux-env/
3.k8s-master01节点免密钥登录集群并同步数据
1.设置主机名,各节点参考如下命令修改即可
hostnamectl set-hostname k8s-master01
2.设置相应的主机名及hosts文件解析
cat >> /etc/hosts <<'EOF'
10.0.0.240 apiserver-lb
10.0.0.241 k8s-master01
10.0.0.242 k8s-master02
10.0.0.243 k8s-master03
10.0.0.244 k8s-worker04
10.0.0.245 k8s-worker05
EOF
3.配置免密码登录其他节点
cat > password_free_login.sh <<'EOF'
#!/bin/bash
# auther: Jason Yin
# 创建密钥对
ssh-keygen -t rsa -P "" -f /root/.ssh/id_rsa -q
# 声明你服务器密码，建议所有节点的密码均一致，否则该脚本需要再次进行优化
export mypasswd=yinzhengjie
# 定义主机列表
k8s_host_list=(k8s-master02 k8s-master03 k8s-worker04 k8s-worker05)
# 配置免密登录，利用expect工具免交互输入
for i in ${k8s_host_list[@]};do
expect -c "
spawn ssh-copy-id -i /root/.ssh/id_rsa.pub root@$i
expect {
\"*yes/no*\" {send \"yes\r\"; exp_continue}
\"*password*\" {send \"$mypasswd\r\"; exp_continue}
}"
done
EOF
sh password_free_login.sh
4.编写同步脚本
cat > /usr/local/sbin/data_rsync.sh <<'EOF'
#!/bin/bash
# Auther: Jason Yin
if [ $# -ne 1 ];then
echo "Usage: $0 /path/to/file(绝对路径)"
exit
fi
if [ ! -e $1 ];then
echo "[ $1 ] dir or file not find!"
exit
fi
fullpath=`dirname $1`
basename=`basename $1`
cd $fullpath
k8s_host_list=(k8s-master02 k8s-master03 k8s-worker04 k8s-worker05)
for host in ${k8s_host_list[@]};do
tput setaf 2
echo ===== rsyncing ${host}: $basename =====
tput setaf 7
rsync -az $basename `whoami`@${host}:$fullpath
if [ $? -eq 0 ];then
echo "命令执行成功!"
fi
done
EOF
chmod +x /usr/local/sbin/data_rsync.sh
5.同步"/etc/hosts"文件到集群
data_rsync.sh /etc/hosts
4.所有节点Linux基础环境优化
1.所有节点关闭firewalld，selinux，NetworkManager，postfix
systemctl disable --now NetworkManager firewalld postfix
setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
2.所有节点关闭swap分区，fstab注释swap
swapoff -a && sysctl -w vm.swappiness=0
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab
free -h
3.所有节点同步时间
- 手动同步时区和时间
ln -svf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
ntpdate ntp.aliyun.com
- 定期任务同步(也可以使用"crontab -e"手动编辑，但我更推荐我下面的做法，可以非交互)
echo "*/5 * * * * /usr/sbin/ntpdate ntp.aliyun.com" > /var/spool/cron/root
crontab -l
4.所有节点配置limit
cat >> /etc/security/limits.conf <<'EOF'
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
EOF
5.所有节点优化sshd服务
sed -i 's@#UseDNS yes@UseDNS no@g' /etc/ssh/sshd_config
sed -i 's@^GSSAPIAuthentication yes@GSSAPIAuthentication no@g' /etc/ssh/sshd_config
- UseDNS选项:
打开状态下，当客户端试图登录SSH服务器时，服务器端先根据客户端的IP地址进行DNS PTR反向查询出客户端的主机名，然后根据查询出的客户端主机名进行DNS正向A记录查询，验证与其原始IP地址是否一致，这是防止客户端欺骗的一种措施，但一般我们的是动态IP不会有PTR记录，打开这个选项不过是在白白浪费时间而已，不如将其关闭。
- GSSAPIAuthentication:
当这个参数开启（ GSSAPIAuthentication yes ）的时候，通过SSH登陆服务器时候会有些会很慢！这是由于服务器端启用了GSSAPI。登陆的时候客户端需要对服务器端的IP地址进行反解析，如果服务器的IP地址没有配置PTR记录，那么就容易在这里卡住了。
6.Linux内核调优
cat > /etc/sysctl.d/k8s.conf <<'EOF'
# 以下3个参数是containerd所依赖的内核参数
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv6.conf.all.disable_ipv6 = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF
sysctl --system
7.修改终端颜色
cat <<EOF >> ~/.bashrc
PS1='[\[\e[34;1m\]\u@\[\e[0m\]\[\e[32;1m\]\H\[\e[0m\]\[\e[31;1m\] \W\[\e[0m\]]# '
EOF
source ~/.bashrc
5.所有节点升级Linux内核并更新系统
1.k8s-master01节点下载并安装内核软件包
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm
2.k8s-master01节点将下载的软件包同步到其他节点
data_rsync.sh kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm
data_rsync.sh kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
3.所有节点执行安装升级Linux内核命令
yum -y localinstall kernel-ml*
4.更改内核启动顺序
grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg
grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"
grubby --default-kernel
5.所有节点更新软件版本，但不需要更新内核，因为我内核已经更新到了指定的版本
yum -y update --exclude=kernel*
6.所有节点安装ipvsadm以实现kube-proxy的负载均衡
1.安装ipvsadm等相关工具
yum -y install ipvsadm ipset sysstat conntrack libseccomp
2.所有节点创建要开机自动加载的模块配置文件
cat > /etc/modules-load.d/ipvs.conf << 'EOF'
ip_vs
ip_vs_lc
ip_vs_wlc
ip_vs_rr
ip_vs_wrr
ip_vs_lblc
ip_vs_lblcr
ip_vs_dh
ip_vs_sh
ip_vs_fo
ip_vs_nq
ip_vs_sed
ip_vs_ftp
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF
3 修改ens33网卡名称为eth0【选做，建议修改】
3.1 修改配置文件
vim /etc/default/grub
...
GRUB_CMDLINE_LINUX="... net.ifnames=0 biosdevname=0"
3.2 用grub2-mkconfig重新生成配置。
grub2-mkconfig -o /boot/grub2/grub.cfg
3.3 修改网卡配置
mv /etc/sysconfig/network-scripts/ifcfg-{ens33,eth0}
sed -i 's#ens33#eth0#g' /etc/sysconfig/network-scripts/ifcfg-eth0
cat /etc/sysconfig/network-scripts/ifcfg-eth0
4 重启操作系统即可
reboot
温馨提示:
如果无法正常启动，则可用考虑将ens33网卡替换为eth0网卡，建议不要忘记写"DEVICE"字段哟。
5 验证加载的模块
lsmod | grep --color=auto -e ip_vs -e nf_conntrack
uname -r
ifconfig
温馨提示:
Linux kernel 4.19+版本已经将之前的"nf_conntrack_ipv4"模块更名为"nf_conntrack"模块哟~
二.安装K8S相关的基础组件
1.所有节点安装containerd
1.1 所有节点安装containerd组件
wget -O /etc/yum.repos.d/docker-ce.repo https://download.docker.com/linux/centos/docker-ce.repo
yum -y install containerd.io
温馨提示:
其实我们只需要安装containerd组件即可，但是安装docker也无妨，可以管理起来很方便。
如果你想要安装docker的话，我推荐使用"docker-ce-20.10.24 docker-ce-cli-20.10.24"版本。
1.2 配置containerd需要的模块
1.临时手动加载模块
modprobe -- overlay
modprobe -- br_netfilter
2.开机自动加载所需的内核模块
cat > /etc/modules-load.d/containerd.conf <<EOF
overlay
br_netfilter
EOF
1.3 修改containerd的配置文件
1.重新初始化containerd的配置文件
containerd config default | tee /etc/containerd/config.toml
2.修改Cgroup的管理者为systemd组件
sed -ri 's#(SystemdCgroup = )false#\1true#' /etc/containerd/config.toml
grep SystemdCgroup /etc/containerd/config.toml
3.修改pause的基础镜像名称
sed -i 's#registry.k8s.io/pause:3.6#registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.7#' /etc/containerd/config.toml
grep sandbox_image /etc/containerd/config.toml
1.4 所有节点启动containerd
1.启动containerd服务
systemctl daemon-reload
systemctl enable --now containerd
systemctl status containerd
2.配置crictl客户端连接的运行时位置
cat > /etc/crictl.yaml <<EOF
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 10
debug: false
EOF
3.查看containerd的版本
[root@k8s-master01 ~]# ctr version
Client:
Version: 1.6.27
Revision: a1496014c916f9e62104b33d1bb5bd03b0858e59
Go version: go1.20.13
Server:
Version: 1.6.27
Revision: a1496014c916f9e62104b33d1bb5bd03b0858e59
UUID: 4a5766bc-691f-49be-9182-b467ed31e330
[root@k8s-master01 ~]#
2.安装etcd组件
2.1 下载etcd软件包
wget https://github.com/etcd-io/etcd/releases/download/v3.5.10/etcd-v3.5.10-linux-amd64.tar.gz
2.2 解压etcd的二进制程序包到PATH环境变量路径
1.解压软件包
tar -xf etcd-v3.5.10-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.10-linux-amd64/etcd{,ctl}
2.查看etcd版本
[root@k8s-master01 ~]# etcdctl version
etcdctl version: 3.5.10
API version: 3.5
[root@k8s-master01 ~]#
2.3 将软件包下发到所有节点
[root@k8s-master01 ~]# MasterNodes='k8s-master02 k8s-master03'
[root@k8s-master01 ~]# for NODE in $MasterNodes; do echo $NODE; scp /usr/local/bin/etcd* $NODE:/usr/local/bin/; done
3.安装k8s组件
3.1 下载k8s二进制软件版
3.1.1 选择K8S的版本
如上图所示，我们需要选择我们要下载的K8S版本号。
3.1.2 进入CHANGELOG目录
如上图所示，我们需要进入到CHANGELOG目录，以便于查看个版本的CHANGELOGs日志信息。
3.1.3 查看对应K8S版本的CHANGELOG文档
如上图所示，目前官方最新的版本是K8S 1.28，本次我打算部署最新版本的K8S。
3.1.4 选择K8S的服务端二进制软件包链接
如上图所示，目前K8S 1.28.3是最新版本，可以下载对应服务端的二进制软件包。
3.1.5 根据CPU架构选择合适的K8S软件包
wget https://dl.k8s.io/v1.28.3/kubernetes-server-linux-amd64.tar.gz
3.2 解压K8S的二进制程序包到PATH环境变量路径
1.解压软件包
[root@k8s-master01 ~]# tar -xf kubernetes-server-linux-amd64.tar.gz --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy}
2.查看kubelet的版本
[root@k8s-master01 ~]# kubelet --version
Kubernetes v1.28.3
[root@k8s-master01 ~]#
3.3 将软件包下发到所有节点
MasterNodes='k8s-master02 k8s-master03'
WorkNodes='k8s-worker04 k8s-worker05'
for NODE in $MasterNodes; do echo $NODE; scp /usr/local/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} $NODE:/usr/local/bin/; done
for NODE in $WorkNodes; do echo $NODE; scp /usr/local/bin/kube{let,-proxy} $NODE:/usr/local/bin/; done
三.生成k8s和etcd证书文件
1.安装cfssl证书管理工具
github下载地址:
https://github.com/cloudflare/cfssl
温馨提示:
生成K8S和etcd证书这一步骤很关键，我建议各位在做实验前先对K8S集群的所有节点拍一下快照，以避免你实验做失败了方便回滚。
关于cfssl证书可以自行在github下载即可，当然也可以使用我课堂上给大家下载好的软件包哟。
具体操作如下：
1.解压压缩包
[root@k8s-master01 ~]# unzip yinzhengjie-cfssl.zip
2.重命名cfssl的版本号信息
[root@k8s-master01 ~]# rename _1.6.4_linux_amd64 "" *
3.将cfssl证书拷贝到环境变量并授权执行权限
[root@k8s-master01 ~]# mv cfssl* /usr/local/bin/
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# chmod +x /usr/local/bin/cfssl*
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# ll /usr/local/bin/cfssl*
-rwxr-xr-x 1 root root 12054528 Aug 30 15:46 /usr/local/bin/cfssl
-rwxr-xr-x 1 root root 9560064 Aug 30 15:45 /usr/local/bin/cfssl-certinfo
-rwxr-xr-x 1 root root 7643136 Aug 30 15:48 /usr/local/bin/cfssljson
[root@k8s-master01 ~]#
2.生成etcd证书
2.1 k8s-master01节点创建etcd证书存储目录
[root@k8s-master01 ~]# mkdir -pv /yinzhengjie/certs/{etcd,pki}/ && cd /yinzhengjie/certs/pki/
2.2 k8s-master01节点生成etcd证书的自建ca证书
1.生成证书的CSR文件： 证书签发请求文件，配置了一些域名，公司，单位
[root@k8s-master01 pki]# cat etcd-ca-csr.json
{
"CN": "etcd",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "etcd",
"OU": "Etcd Security"
}
],
"ca": {
"expiry": "876000h"
}
}
[root@k8s-master01 pki]#
2.生成etcd CA证书和CA证书的key
[root@k8s-master01 pki]# cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /yinzhengjie/certs/etcd/etcd-ca
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# ll /yinzhengjie/certs/etcd/
total 12
-rw-r--r-- 1 root root 1050 Jan 7 15:36 etcd-ca.csr
-rw------- 1 root root 1679 Jan 7 15:36 etcd-ca-key.pem
-rw-r--r-- 1 root root 1318 Jan 7 15:36 etcd-ca.pem
[root@k8s-master01 pki]#
2.3 k8s-master01节点基于自建ca证书颁发etcd证书
1.生成etcd证书的有效期为100年
[root@k8s-master01 pki]# cat ca-config.json
{
"signing": {
"default": {
"expiry": "876000h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "876000h"
}
}
}
}
[root@k8s-master01 pki]#
2.生成证书的CSR文件： 证书签发请求文件，配置了一些域名，公司，单位
[root@k8s-master01 pki]# cat etcd-csr.json
{
"CN": "etcd",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "etcd",
"OU": "Etcd Security"
}
]
}
[root@k8s-master01 pki]#
3.基于自建的ectd ca证书生成etcd的证书
[root@k8s-master01 pki]# cfssl gencert \
-ca=/yinzhengjie/certs/etcd/etcd-ca.pem \
-ca-key=/yinzhengjie/certs/etcd/etcd-ca-key.pem \
-config=ca-config.json \
--hostname=127.0.0.1,k8s-master01,k8s-master02,k8s-master03,10.0.0.241,10.0.0.242,10.0.0.243 \
--profile=kubernetes \
etcd-csr.json | cfssljson -bare /yinzhengjie/certs/etcd/etcd-server
[root@k8s-master01 pki]# ll /yinzhengjie/certs/etcd/
total 24
-rw-r--r-- 1 root root 1050 Jan 7 15:36 etcd-ca.csr
-rw------- 1 root root 1679 Jan 7 15:36 etcd-ca-key.pem
-rw-r--r-- 1 root root 1318 Jan 7 15:36 etcd-ca.pem
-rw-r--r-- 1 root root 1131 Jan 7 15:40 etcd-server.csr
-rw------- 1 root root 1679 Jan 7 15:40 etcd-server-key.pem
-rw-r--r-- 1 root root 1464 Jan 7 15:40 etcd-server.pem
[root@k8s-master01 pki]#
2.4 k8s-master01节点将etcd证书拷贝到其他两个master节点
MasterNodes='k8s-master02 k8s-master03'
for NODE in $MasterNodes; do
echo $NODE; ssh $NODE "mkdir -pv /yinzhengjie/certs/etcd/"
for FILE in etcd-ca-key.pem etcd-ca.pem etcd-server-key.pem etcd-server.pem; do
scp /yinzhengjie/certs/etcd/${FILE} $NODE:/yinzhengjie/certs/etcd/${FILE}
done
done
3.生成k8s组件相关证书
3.1 所有节点创建k8s证书存储目录
[root@k8s-master01 pki]# mkdir -pv /yinzhengjie/certs/kubernetes/
3.2 k8s-master01节点生成kubernetes自建ca证书
1.生成证书的CSR文件： 证书签发请求文件，配置了一些域名，公司，单位
[root@k8s-master01 pki]# cat k8s-ca-csr.json
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "Kubernetes",
"OU": "Kubernetes-manual"
}
],
"ca": {
"expiry": "876000h"
}
}
[root@k8s-master01 pki]#
2.生成kubernetes证书
[root@k8s-master01 pki]# cfssl gencert -initca k8s-ca-csr.json | cfssljson -bare /yinzhengjie/certs/kubernetes/k8s-ca
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# ll /yinzhengjie/certs/kubernetes/
total 12
-rw-r--r-- 1 root root 1070 Jan 7 15:47 k8s-ca.csr
-rw------- 1 root root 1675 Jan 7 15:47 k8s-ca-key.pem
-rw-r--r-- 1 root root 1363 Jan 7 15:47 k8s-ca.pem
[root@k8s-master01 pki]#
3.3 k8s-master01节点基于自建ca证书颁发apiserver相关证书
1.生成k8s证书的有效期为100年
[root@k8s-master01 pki]# cat k8s-ca-config.json
{
"signing": {
"default": {
"expiry": "876000h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "876000h"
}
}
}
}
[root@k8s-master01 pki]#
2.生成apiserver证书的CSR文件： 证书签发请求文件，配置了一些域名，公司，单位
[root@k8s-master01 pki]# cat apiserver-csr.json
{
"CN": "kube-apiserver",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "Kubernetes",
"OU": "Kubernetes-manual"
}
]
}
[root@k8s-master01 pki]#
3.基于自建ca证书生成apiServer的证书文件
[root@k8s-master01 pki]# cfssl gencert \
-ca=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
-ca-key=/yinzhengjie/certs/kubernetes/k8s-ca-key.pem \
-config=k8s-ca-config.json \
--hostname=10.200.0.1,10.0.0.240,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.yinzhengjie,kubernetes.default.svc.yinzhengjie.com,10.0.0.241,10.0.0.242,10.0.0.243,10.0.0.244,10.0.0.245 \
--profile=kubernetes \
apiserver-csr.json | cfssljson -bare /yinzhengjie/certs/kubernetes/apiserver
[root@k8s-master01 pki]# ll /yinzhengjie/certs/kubernetes/apiserver*
-rw-r--r-- 1 root root 1314 Jan 7 17:03 /yinzhengjie/certs/kubernetes/apiserver.csr
-rw------- 1 root root 1679 Jan 7 17:03 /yinzhengjie/certs/kubernetes/apiserver-key.pem
-rw-r--r-- 1 root root 1712 Jan 7 17:03 /yinzhengjie/certs/kubernetes/apiserver.pem
[root@k8s-master01 pki]#
温馨提示:
"10.200.0.1"为咱们的svc网段的第一个地址，您需要根据自己的场景稍作修改。
"10.0.0.240"是负载均衡器的VIP地址。
"kubernetes,...,kubernetes.default.svc.yinzhengjie.com"对应的是apiServer解析的A记录。
"10.0.0.241,...,10.0.0.245"对应的是K8S集群的地址。
3.4 生成第三方组件与apiServer通信的聚合证书
聚合证书的作用就是让第三方组件(比如metrics-server等)能够拿这个证书文件和apiServer进行通信。
1.生成聚合证书的用于自建ca的CSR文件
[root@k8s-master01 pki]# cat front-proxy-ca-csr.json
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
}
}
[root@k8s-master01 pki]#
2.生成聚合证书的自建ca证书
[root@k8s-master01 pki]# cfssl gencert -initca front-proxy-ca-csr.json | cfssljson -bare /yinzhengjie/certs/kubernetes/front-proxy-ca
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# ll /yinzhengjie/certs/kubernetes/front-proxy-ca*
-rw-r--r-- 1 root root 891 Jan 7 17:05 /yinzhengjie/certs/kubernetes/front-proxy-ca.csr
-rw------- 1 root root 1675 Jan 7 17:05 /yinzhengjie/certs/kubernetes/front-proxy-ca-key.pem
-rw-r--r-- 1 root root 1094 Jan 7 17:05 /yinzhengjie/certs/kubernetes/front-proxy-ca.pem
[root@k8s-master01 pki]#
3.生成聚合证书的用于客户端的CSR文件
[root@k8s-master01 pki]# cat front-proxy-client-csr.json
{
"CN": "front-proxy-client",
"key": {
"algo": "rsa",
"size": 2048
}
}
[root@k8s-master01 pki]#
4.基于聚合证书的自建ca证书签发聚合证书的客户端证书
[root@k8s-master01 pki]# cfssl gencert \
-ca=/yinzhengjie/certs/kubernetes/front-proxy-ca.pem \
-ca-key=/yinzhengjie/certs/kubernetes/front-proxy-ca-key.pem \
-config=k8s-ca-config.json \
-profile=kubernetes \
front-proxy-client-csr.json | cfssljson -bare /yinzhengjie/certs/kubernetes/front-proxy-client
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# ll /yinzhengjie/certs/kubernetes/front-proxy-client*
-rw-r--r-- 1 root root 903 Jan 7 17:06 /yinzhengjie/certs/kubernetes/front-proxy-client.csr
-rw------- 1 root root 1679 Jan 7 17:06 /yinzhengjie/certs/kubernetes/front-proxy-client-key.pem
-rw-r--r-- 1 root root 1188 Jan 7 17:06 /yinzhengjie/certs/kubernetes/front-proxy-client.pem
[root@k8s-master01 pki]#
3.5 生成controller-manager证书及kubeconfig文件
1.生成controller-manager的CSR文件
[root@k8s-master01 pki]# cat controller-manager-csr.json
{
"CN": "system:kube-controller-manager",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-controller-manager",
"OU": "Kubernetes-manual"
}
]
}
[root@k8s-master01 pki]#
2.生成controller-manager证书文件
[root@k8s-master01 pki]# cfssl gencert \
-ca=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
-ca-key=/yinzhengjie/certs/kubernetes/k8s-ca-key.pem \
-config=k8s-ca-config.json \
-profile=kubernetes \
controller-manager-csr.json | cfssljson -bare /yinzhengjie/certs/kubernetes/controller-manager
[root@k8s-master01 pki]# ll /yinzhengjie/certs/kubernetes/controller-manager*
-rw-r--r-- 1 root root 1082 Nov 5 11:31 /yinzhengjie/certs/kubernetes/controller-manager.csr
-rw------- 1 root root 1675 Nov 5 11:31 /yinzhengjie/certs/kubernetes/controller-manager-key.pem
-rw-r--r-- 1 root root 1501 Nov 5 11:31 /yinzhengjie/certs/kubernetes/controller-manager.pem
[root@k8s-master01 pki]#
3.创建一个kubeconfig目录
[root@k8s-master01 pki]# mkdir -pv /yinzhengjie/certs/kubeconfig
4.设置一个集群
[root@k8s-master01 pki]# kubectl config set-cluster yinzhengjie-k8s \
--certificate-authority=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
--embed-certs=true \
--server=https://10.0.0.240:8443 \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-controller-manager.kubeconfig
5.设置一个用户项
[root@k8s-master01 pki]# kubectl config set-credentials system:kube-controller-manager \
--client-certificate=/yinzhengjie/certs/kubernetes/controller-manager.pem \
--client-key=/yinzhengjie/certs/kubernetes/controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-controller-manager.kubeconfig
6.设置一个上下文环境
[root@k8s-master01 pki]# kubectl config set-context system:kube-controller-manager@kubernetes \
--cluster=yinzhengjie-k8s \
--user=system:kube-controller-manager \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-controller-manager.kubeconfig
7.使用默认的上下文
[root@k8s-master01 pki]# kubectl config use-context system:kube-controller-manager@kubernetes \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-controller-manager.kubeconfig
3.6 生成scheduler证书及kubeconfig文件
1.生成scheduler的CSR文件
[root@k8s-master01 pki]# cat scheduler-csr.json
{
"CN": "system:kube-scheduler",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-scheduler",
"OU": "Kubernetes-manual"
}
]
}
[root@k8s-master01 pki]#
2.生成scheduler证书文件
[root@k8s-master01 pki]# cfssl gencert \
-ca=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
-ca-key=/yinzhengjie/certs/kubernetes/k8s-ca-key.pem \
-config=k8s-ca-config.json \
-profile=kubernetes \
scheduler-csr.json | cfssljson -bare /yinzhengjie/certs/kubernetes/scheduler
[root@k8s-master01 pki]# ll /yinzhengjie/certs/kubernetes/scheduler*
-rw-r--r-- 1 root root 1058 Jan 7 18:56 /yinzhengjie/certs/kubernetes/scheduler.csr
-rw------- 1 root root 1679 Jan 7 18:56 /yinzhengjie/certs/kubernetes/scheduler-key.pem
-rw-r--r-- 1 root root 1476 Jan 7 18:56 /yinzhengjie/certs/kubernetes/scheduler.pem
[root@k8s-master01 pki]#
3.设置一个集群
[root@k8s-master01 pki]# kubectl config set-cluster yinzhengjie-k8s \
--certificate-authority=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
--embed-certs=true \
--server=https://10.0.0.240:8443 \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-scheduler.kubeconfig
4.设置一个用户项
[root@k8s-master01 pki]# kubectl config set-credentials system:kube-scheduler \
--client-certificate=/yinzhengjie/certs/kubernetes/scheduler.pem \
--client-key=/yinzhengjie/certs/kubernetes/scheduler-key.pem \
--embed-certs=true \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-scheduler.kubeconfig
5.设置一个上下文环境
[root@k8s-master01 pki]# kubectl config set-context system:kube-scheduler@kubernetes \
--cluster=yinzhengjie-k8s \
--user=system:kube-scheduler \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-scheduler.kubeconfig
6.使用默认的上下文
[root@k8s-master01 pki]# kubectl config use-context system:kube-scheduler@kubernetes \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-scheduler.kubeconfig
3.7 配置k8s集群管理员证书及kubeconfig文件
1.生成管理员的CSR文件
[root@k8s-master01 pki]# cat admin-csr.json
{
"CN": "admin",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:masters",
"OU": "Kubernetes-manual"
}
]
}
[root@k8s-master01 pki]#
2.生成k8s集群管理员证书
[root@k8s-master01 pki]# cfssl gencert \
-ca=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
-ca-key=/yinzhengjie/certs/kubernetes/k8s-ca-key.pem \
-config=k8s-ca-config.json \
-profile=kubernetes \
admin-csr.json | cfssljson -bare /yinzhengjie/certs/kubernetes/admin
[root@k8s-master01 pki]# ll /yinzhengjie/certs/kubernetes/admin*
-rw-r--r-- 1 root root 1025 Jan 7 19:00 /yinzhengjie/certs/kubernetes/admin.csr
-rw------- 1 root root 1675 Jan 7 19:00 /yinzhengjie/certs/kubernetes/admin-key.pem
-rw-r--r-- 1 root root 1444 Jan 7 19:00 /yinzhengjie/certs/kubernetes/admin.pem
[root@k8s-master01 pki]#
2.设置一个集群
[root@k8s-master01 pki]# kubectl config set-cluster yinzhengjie-k8s \
--certificate-authority=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
--embed-certs=true \
--server=https://10.0.0.240:8443 \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-admin.kubeconfig
4.设置一个用户项
[root@k8s-master01 pki]# kubectl config set-credentials kube-admin \
--client-certificate=/yinzhengjie/certs/kubernetes/admin.pem \
--client-key=/yinzhengjie/certs/kubernetes/admin-key.pem \
--embed-certs=true \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-admin.kubeconfig
5.设置一个上下文环境
[root@k8s-master01 pki]# kubectl config set-context kube-admin@kubernetes \
--cluster=yinzhengjie-k8s \
--user=kube-admin \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-admin.kubeconfig
6.使用默认的上下文
[root@k8s-master01 pki]# kubectl config use-context kube-admin@kubernetes \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-admin.kubeconfig
3.8 创建ServiceAccount
1.ServiceAccount是k8s一种认证方式，创建ServiceAccount的时候会创建一个与之绑定的secret，这个secret会生成一个token
[root@k8s-master01 pki]# openssl genrsa -out /yinzhengjie/certs/kubernetes/sa.key 2048
2.基于sa.key创建sa.pub
[root@k8s-master01 pki]# openssl rsa -in /yinzhengjie/certs/kubernetes/sa.key -pubout -out /yinzhengjie/certs/kubernetes/sa.pub
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# ll /yinzhengjie/certs/kubernetes/sa*
-rw-r--r-- 1 root root 1679 Jan 7 19:02 /yinzhengjie/certs/kubernetes/sa.key
-rw-r--r-- 1 root root 451 Jan 7 19:03 /yinzhengjie/certs/kubernetes/sa.pub
[root@k8s-master01 pki]#
3.9 k8s-master01节点K8S组件证书拷贝到其他两个master节点
1.k8s-master01节点将etcd证书拷贝到其他两个master节点
[root@k8s-master01 pki]# for NODE in k8s-master02 k8s-master03; do
echo $NODE; ssh $NODE "mkdir -pv /yinzhengjie/certs/{kubernetes,kubeconfig}"
for FILE in $(ls /yinzhengjie/certs/kubernetes); do
scp /yinzhengjie/certs/kubernetes/${FILE} $NODE:/yinzhengjie/certs/kubernetes/${FILE};
done;
for FILE in kube-admin.kubeconfig kube-controller-manager.kubeconfig kube-scheduler.kubeconfig; do
scp /yinzhengjie/certs/kubeconfig/${FILE} $NODE:/yinzhengjie/certs/kubeconfig/${FILE};
done;
done
2.其他两个节点验证文件数量是否正确
[root@k8s-master02 ~]# ls /yinzhengjie/certs/kubernetes | wc -l
23
[root@k8s-master02 ~]#
[root@k8s-master03 ~]# ls /yinzhengjie/certs/kubernetes | wc -l
23
[root@k8s-master03 ~]#
四.部署K8S高可用集群
1.高可用组件haproxy+keepalived安装
1.1 所有master节点安装高可用组件
温馨提示:
- 对于高可用组件，其实我们也可以单独找两台虚拟机来部署，但我为了节省2台机器，就直接在master节点复用了。
- 如果在云上安装K8S则无安装高可用组件了，毕竟公有云大部分都是不支持keepalived的，可以直接使用云产品，比如阿里的"SLB"，腾讯的"ELB"等SAAS产品;
- 推荐使用ELB，SLB有回环的问题，也就是SLB代理的服务器不能反向访问SLB，但是腾讯云修复了这个问题;
具体实操:
yum -y install keepalived haproxy
1.2 所有master节点配置haproxy
温馨提示:
- haproxy的负载均衡器监听地址我配置是8443，你可以修改为其他端口，haproxy会用来反向代理各个master组件的地址;
- 如果你真的修改晴一定注意上面的证书配置的kubeconfig文件，也要一起修改，否则就会出现链接集群失败的问题;
具体实操:
1.备份配置文件
cp /etc/haproxy/haproxy.cfg{,`date +%F`}
2.所有节点的配置文件内容相同
cat > /etc/haproxy/haproxy.cfg <<'EOF'
global
maxconn 2000
ulimit-n 16384
log 127.0.0.1 local0 err
stats timeout 30s
defaults
log global
mode http
option httplog
timeout connect 5000
timeout client 50000
timeout server 50000
timeout http-request 15s
timeout http-keep-alive 15s
frontend monitor-haproxy
bind *:33305
mode http
option httplog
monitor-uri /ayouok
frontend yinzhengjie-k8s
bind 0.0.0.0:8443
bind 127.0.0.1:8443
mode tcp
option tcplog
tcp-request inspect-delay 5s
default_backend yinzhengjie-k8s
backend yinzhengjie-k8s
mode tcp
option tcplog
option tcp-check
balance roundrobin
default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
server k8s-master01 10.0.0.241:6443 check
server k8s-master02 10.0.0.242:6443 check
server k8s-master03 10.0.0.243:6443 check
EOF
1.3 所有master节点配置keepalived
温馨提示:
- 注意"interface"字段为你的物理网卡的名称，如果你的网卡是ens33，请将"eth0"修改为"ens33"哟;
- 注意"mcast_src_ip"各master节点的配置均不相同，修改根据实际环境进行修改哟;
- 注意"virtual_ipaddress"指定的是负载均衡器的VIP地址，这个地址也要和kubeconfig文件的Apiserver地址要一致哟;
- 注意"script"字段的脚本用于检测后端的apiServer是否健康;
- 注意"router_id"字段为节点ip，master每个节点配置自己的IP
具体实操:
1.备份配置文件
cp /etc/keepalived/keepalived.conf{,`date +%F`}
2."k8s-master01"节点创建配置文件
[root@k8s-master01 ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.0.241 netmask 255.255.255.0 broadcast 10.0.0.255
ether 00:0c:29:32:73:ac txqueuelen 1000 (Ethernet)
RX packets 324292 bytes 234183010 (223.3 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 242256 bytes 31242156 (29.7 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
...
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# cat > /etc/keepalived/keepalived.conf <<'EOF'
! Configuration File for keepalived
global_defs {
router_id 10.0.0.241
}
vrrp_script chk_nginx {
script "/etc/keepalived/check_port.sh 8443"
interval 2
weight -20
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 251
priority 100
advert_int 1
mcast_src_ip 10.0.0.241
nopreempt
authentication {
auth_type PASS
auth_pass yinzhengjie_k8s
}
track_script {
chk_nginx
}
virtual_ipaddress {
10.0.0.240
}
}
EOF
3."k8s-master02"节点创建配置文件
[root@k8s-master02 ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.0.242 netmask 255.255.255.0 broadcast 10.0.0.255
ether 00:0c:29:cf:ad:0a txqueuelen 1000 (Ethernet)
RX packets 256743 bytes 42628265 (40.6 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 252589 bytes 34277384 (32.6 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
...
[root@k8s-master02 ~]#
[root@k8s-master02 ~]# cat > /etc/keepalived/keepalived.conf <<EOF
! Configuration File for keepalived
global_defs {
router_id 10.0.0.242
}
vrrp_script chk_nginx {
script "/etc/keepalived/check_port.sh 8443"
interval 2
weight -20
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 251
priority 100
advert_int 1
mcast_src_ip 10.0.0.242
nopreempt
authentication {
auth_type PASS
auth_pass yinzhengjie_k8s
}
track_script {
chk_nginx
}
virtual_ipaddress {
10.0.0.240
}
}
EOF
4."k8s-master03"节点创建配置文件
[root@k8s-master03 ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.0.243 netmask 255.255.255.0 broadcast 10.0.0.255
ether 00:0c:29:5f:f7:4f txqueuelen 1000 (Ethernet)
RX packets 178577 bytes 34808750 (33.1 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 171025 bytes 26471309 (25.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
...
[root@k8s-master03 ~]#
[root@k8s-master03 ~]# cat > /etc/keepalived/keepalived.conf <<EOF
! Configuration File for keepalived
global_defs {
router_id 10.0.0.243
}
vrrp_script chk_nginx {
script "/etc/keepalived/check_port.sh 8443"
interval 2
weight -20
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 251
priority 100
advert_int 1
mcast_src_ip 10.0.0.243
nopreempt
authentication {
auth_type PASS
auth_pass yinzhengjie_k8s
}
track_script {
chk_nginx
}
virtual_ipaddress {
10.0.0.240
}
}
EOF
5.所有keepalived节点均需要创建健康检查脚本
vi /etc/keepalived/check_port.sh
iCHK_PORT=$1
if [ -n "$CHK_PORT" ];then
PORT_PROCESS=\`ss -lt|grep $CHK_PORT|wc -l\`
if [ $PORT_PROCESS -eq 0 ];then
echo "Port $CHK_PORT Is Not Used,End."
exit 1
fi
else
echo "Check Port Cant Be Empty!"
fi
1.4 启动keepalived服务并验证
1.启动keepalived服务
systemctl daemon-reload
systemctl enable --now keepalived
systemctl status keepalived
2.验证服务是否正常
[root@k8s-master03 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:5f:f7:4f brd ff:ff:ff:ff:ff:ff
inet 10.0.0.243/24 brd 10.0.0.255 scope global eth0
valid_lft forever preferred_lft forever
inet 10.0.0.240/32 scope global eth0
valid_lft forever preferred_lft forever
3: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
link/ipip 0.0.0.0 brd 0.0.0.0
[root@k8s-master03 ~]#
[root@k8s-master03 ~]# ping 10.0.0.240
PING 10.0.0.240 (10.0.0.240) 56(84) bytes of data.
64 bytes from 10.0.0.240: icmp_seq=1 ttl=64 time=0.019 ms
64 bytes from 10.0.0.240: icmp_seq=2 ttl=64 time=0.027 ms
64 bytes from 10.0.0.240: icmp_seq=3 ttl=64 time=0.023 ms
...
3.单独开一个终端尝试停止keepalived服务
[root@k8s-master03 ~]# systemctl stop keepalived
4.再次观察终端输出
[root@k8s-master03 ~]# ping 10.0.0.240
PING 10.0.0.240 (10.0.0.240) 56(84) bytes of data.
64 bytes from 10.0.0.240: icmp_seq=1 ttl=64 time=0.019 ms
64 bytes from 10.0.0.240: icmp_seq=2 ttl=64 time=0.027 ms
64 bytes from 10.0.0.240: icmp_seq=3 ttl=64 time=0.023 ms
...
64 bytes from 10.0.0.240: icmp_seq=36 ttl=64 time=0.037 ms
64 bytes from 10.0.0.240: icmp_seq=37 ttl=64 time=0.023 ms
From 10.0.0.242: icmp_seq=38 Redirect Host(New nexthop: 10.0.0.240)
From 10.0.0.242: icmp_seq=39 Redirect Host(New nexthop: 10.0.0.240)
64 bytes from 10.0.0.240: icmp_seq=40 ttl=64 time=1.81 ms
64 bytes from 10.0.0.240: icmp_seq=41 ttl=64 time=0.680 ms
64 bytes from 10.0.0.240: icmp_seq=42 ttl=64 time=0.751 ms
5.验证vip是否飘逸到其他节点，果不其然，真的飘逸到其他master节点啦！
[root@k8s-master02 ~]# ip a
...
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:cf:ad:0a brd ff:ff:ff:ff:ff:ff
inet 10.0.0.242/24 brd 10.0.0.255 scope global eth0
valid_lft forever preferred_lft forever
inet 10.0.0.240/32 scope global eth0
valid_lft forever preferred_lft forever
...
[root@k8s-master02 ~]#
1.5 验证haproxy服务并验证
1.启动haproxy服务
systemctl enable --now haproxy
systemctl status haproxy
2.基于telnet验证haporxy是否正常
[root@k8s-master02 ~]# telnet 10.0.0.240 8443
Trying 10.0.0.240...
Connected to 10.0.0.240.
Escape character is '^]'.
Connection closed by foreign host.
[root@k8s-master02 ~]#
3.基于webUI进行验证
[root@k8s-master02 ~]# curl http://10.0.0.240:33305/ayouok
<html><body><h1>200 OK</h1>
Service ready.
</body></html>
[root@k8s-master02 ~]#
2.启动etcd集群
2.1 创建etcd集群各节点配置文件
1.k8s-master01节点的配置文件
[root@k8s-master01 ~]# mkdir -pv /yinzhengjie/softwares/etcd
[root@k8s-master01 ~]# cat > /yinzhengjie/softwares/etcd/etcd.config.yml <<'EOF'
name: 'k8s-master01'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://10.0.0.241:2380'
listen-client-urls: 'https://10.0.0.241:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.0.0.241:2380'
advertise-client-urls: 'https://10.0.0.241:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://10.0.0.241:2380,k8s-master02=https://10.0.0.242:2380,k8s-master03=https://10.0.0.243:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/yinzhengjie/certs/etcd/etcd-server.pem'
key-file: '/yinzhengjie/certs/etcd/etcd-server-key.pem'
client-cert-auth: true
trusted-ca-file: '/yinzhengjie/certs/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/yinzhengjie/certs/etcd/etcd-server.pem'
key-file: '/yinzhengjie/certs/etcd/etcd-server-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/yinzhengjie/certs/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
2.k8s-master02节点的配置文件
[root@k8s-master02 ~]# mkdir -pv /yinzhengjie/softwares/etcd
[root@k8s-master02 ~]# cat > /yinzhengjie/softwares/etcd/etcd.config.yml << 'EOF'
name: 'k8s-master02'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://10.0.0.242:2380'
listen-client-urls: 'https://10.0.0.242:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.0.0.242:2380'
advertise-client-urls: 'https://10.0.0.242:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://10.0.0.241:2380,k8s-master02=https://10.0.0.242:2380,k8s-master03=https://10.0.0.243:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/yinzhengjie/certs/etcd/etcd-server.pem'
key-file: '/yinzhengjie/certs/etcd/etcd-server-key.pem'
client-cert-auth: true
trusted-ca-file: '/yinzhengjie/certs/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/yinzhengjie/certs/etcd/etcd-server.pem'
key-file: '/yinzhengjie/certs/etcd/etcd-server-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/yinzhengjie/certs/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
3.k8s-master03节点的配置文件
[root@k8s-master03 ~]# mkdir -pv /yinzhengjie/softwares/etcd
[root@k8s-master03 ~]# cat > /yinzhengjie/softwares/etcd/etcd.config.yml << 'EOF'
name: 'k8s-master03'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://10.0.0.243:2380'
listen-client-urls: 'https://10.0.0.243:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.0.0.243:2380'
advertise-client-urls: 'https://10.0.0.243:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://10.0.0.241:2380,k8s-master02=https://10.0.0.242:2380,k8s-master03=https://10.0.0.243:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/yinzhengjie/certs/etcd/etcd-server.pem'
key-file: '/yinzhengjie/certs/etcd/etcd-server-key.pem'
client-cert-auth: true
trusted-ca-file: '/yinzhengjie/certs/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/yinzhengjie/certs/etcd/etcd-server.pem'
key-file: '/yinzhengjie/certs/etcd/etcd-server-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/yinzhengjie/certs/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
2.2 编写etcd启动脚本
cat > /usr/lib/systemd/system/etcd.service <<'EOF'
[Unit]
Description=Jason Yin's Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target
[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/yinzhengjie/softwares/etcd/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
Alias=etcd3.service
EOF
2.3 启动etcd集群
1.启动服务
systemctl daemon-reload && systemctl enable --now etcd
systemctl status etcd
2.查看etcd集群状态
etcdctl --endpoints="10.0.0.241:2379,10.0.0.242:2379,10.0.0.243:2379" --cacert=/yinzhengjie/certs/etcd/etcd-ca.pem --cert=/yinzhengjie/certs/etcd/etcd-server.pem --key=/yinzhengjie/certs/etcd/etcd-server-key.pem endpoint status --write-out=table
2.4 验证etcd集群高可用
[root@k8s-master01 ~]# systemctl stop etcd # 我们可以故意停止一个etcd节点，观察能否查看集群状态
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# etcdctl --endpoints="10.0.0.241:2379,10.0.0.242:2379,10.0.0.243:2379" --cacert=/yinzhengjie/certs/etcd/etcd-ca.pem --cert=/yinzhengjie/certs/etcd/etcd-server.pem --key=/yinzhengjie/certs/etcd/etcd-server-key.pem endpoint status --write-out=table
...
+-----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+-----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 10.0.0.242:2379 | b83b69ba7d246b29 | 3.5.10 | 29 kB | true | false | 3 | 10 | 10 | |
| 10.0.0.243:2379 | 47b70f9ecb1f200 | 3.5.10 | 29 kB | false | false | 3 | 10 | 10 | |
+-----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# systemctl start etcd
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# etcdctl --endpoints="10.0.0.241:2379,10.0.0.242:2379,10.0.0.243:2379" --cacert=/yinzhengjie/certs/etcd/etcd-ca.pem --cert=/yinzhengjie/certs/etcd/etcd-server.pem --key=/yinzhengjie/certs/etcd/etcd-server-key.pem endpoint status --write-out=table
+-----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+-----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 10.0.0.241:2379 | 566d563f3c9274ed | 3.5.10 | 25 kB | false | false | 6 | 20 | 20 | |
| 10.0.0.242:2379 | b83b69ba7d246b29 | 3.5.10 | 29 kB | true | false | 6 | 20 | 20 | |
| 10.0.0.243:2379 | 47b70f9ecb1f200 | 3.5.10 | 29 kB | false | false | 6 | 20 | 20 | |
+-----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
[root@k8s-master01 ~]#
3 部署ApiServer组件
3.1 k8s-master01节点启动ApiServer
温馨提示:
- "--advertise-address"是对应的master节点的IP地址;
- "--service-cluster-ip-range"对应的是svc的网段
- "--service-node-port-range"对应的是svc的NodePort端口范围;
- "--etcd-servers"指定的是etcd集群地址
配置文件参考链接:
https://kubernetes.io/zh-cn/docs/reference/command-line-tools-reference/kube-apiserver/
具体实操:
1.创建k8s-master01节点的配置文件
cat > /usr/lib/systemd/system/kube-apiserver.service << 'EOF'
[Unit]
Description=Jason Yin's Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver \
--v=2 \
--bind-address=0.0.0.0 \
--secure-port=6443 \
--allow_privileged=true \
--advertise-address=10.0.0.241 \
--service-cluster-ip-range=10.200.0.0/16 \
--service-node-port-range=3000-50000 \
--etcd-servers=https://10.0.0.241:2379,https://10.0.0.242:2379,https://10.0.0.243:2379 \
--etcd-cafile=/yinzhengjie/certs/etcd/etcd-ca.pem \
--etcd-certfile=/yinzhengjie/certs/etcd/etcd-server.pem \
--etcd-keyfile=/yinzhengjie/certs/etcd/etcd-server-key.pem \
--client-ca-file=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
--tls-cert-file=/yinzhengjie/certs/kubernetes/apiserver.pem \
--tls-private-key-file=/yinzhengjie/certs/kubernetes/apiserver-key.pem \
--kubelet-client-certificate=/yinzhengjie/certs/kubernetes/apiserver.pem \
--kubelet-client-key=/yinzhengjie/certs/kubernetes/apiserver-key.pem \
--service-account-key-file=/yinzhengjie/certs/kubernetes/sa.pub \
--service-account-signing-key-file=/yinzhengjie/certs/kubernetes/sa.key \
--service-account-issuer=https://kubernetes.default.svc.yinzhengjie.com \
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \
--authorization-mode=Node,RBAC \
--enable-bootstrap-token-auth=true \
--requestheader-client-ca-file=/yinzhengjie/certs/kubernetes/front-proxy-ca.pem \
--proxy-client-cert-file=/yinzhengjie/certs/kubernetes/front-proxy-client.pem \
--proxy-client-key-file=/yinzhengjie/certs/kubernetes/front-proxy-client-key.pem \
--requestheader-allowed-names=aggregator \
--requestheader-group-headers=X-Remote-Group \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-username-headers=X-Remote-User
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
2.启动服务
systemctl daemon-reload && systemctl enable --now kube-apiserver
systemctl status kube-apiserver
3.2 k8s-master02节点启动ApiServer
温馨提示:
- "--advertise-address"是对应的master节点的IP地址;
- "--service-cluster-ip-range"对应的是svc的网段
- "--service-node-port-range"对应的是svc的NodePort端口范围;
- "--etcd-servers"指定的是etcd集群地址
具体实操:
1.创建k8s-master02节点的配置文件
cat > /usr/lib/systemd/system/kube-apiserver.service << 'EOF'
[Unit]
Description=Jason Yin's Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver \
--v=2 \
--bind-address=0.0.0.0 \
--secure-port=6443 \
--advertise-address=10.0.0.242 \
--service-cluster-ip-range=10.200.0.0/16 \
--service-node-port-range=3000-50000 \
--etcd-servers=https://10.0.0.241:2379,https://10.0.0.242:2379,https://10.0.0.243:2379 \
--etcd-cafile=/yinzhengjie/certs/etcd/etcd-ca.pem \
--etcd-certfile=/yinzhengjie/certs/etcd/etcd-server.pem \
--etcd-keyfile=/yinzhengjie/certs/etcd/etcd-server-key.pem \
--client-ca-file=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
--tls-cert-file=/yinzhengjie/certs/kubernetes/apiserver.pem \
--tls-private-key-file=/yinzhengjie/certs/kubernetes/apiserver-key.pem \
--kubelet-client-certificate=/yinzhengjie/certs/kubernetes/apiserver.pem \
--kubelet-client-key=/yinzhengjie/certs/kubernetes/apiserver-key.pem \
--service-account-key-file=/yinzhengjie/certs/kubernetes/sa.pub \
--service-account-signing-key-file=/yinzhengjie/certs/kubernetes/sa.key \
--service-account-issuer=https://kubernetes.default.svc.yinzhengjie.com \
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \
--authorization-mode=Node,RBAC \
--enable-bootstrap-token-auth=true \
--requestheader-client-ca-file=/yinzhengjie/certs/kubernetes/front-proxy-ca.pem \
--proxy-client-cert-file=/yinzhengjie/certs/kubernetes/front-proxy-client.pem \
--proxy-client-key-file=/yinzhengjie/certs/kubernetes/front-proxy-client-key.pem \
--requestheader-allowed-names=aggregator \
--requestheader-group-headers=X-Remote-Group \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-username-headers=X-Remote-User
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
2.启动服务
systemctl daemon-reload && systemctl enable --now kube-apiserver
systemctl status kube-apiserver
3.3 k8s-master03节点启动ApiServer
温馨提示:
- "--advertise-address"是对应的master节点的IP地址;
- "--service-cluster-ip-range"对应的是svc的网段
- "--service-node-port-range"对应的是svc的NodePort端口范围;
- "--etcd-servers"指定的是etcd集群地址
具体实操:
1.创建k8s-master03节点的配置文件
cat > /usr/lib/systemd/system/kube-apiserver.service << 'EOF'
[Unit]
Description=Jason Yin's Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver \
--v=2 \
--bind-address=0.0.0.0 \
--secure-port=6443 \
--advertise-address=10.0.0.243 \
--service-cluster-ip-range=10.200.0.0/16 \
--service-node-port-range=3000-50000 \
--etcd-servers=https://10.0.0.241:2379,https://10.0.0.242:2379,https://10.0.0.243:2379 \
--etcd-cafile=/yinzhengjie/certs/etcd/etcd-ca.pem \
--etcd-certfile=/yinzhengjie/certs/etcd/etcd-server.pem \
--etcd-keyfile=/yinzhengjie/certs/etcd/etcd-server-key.pem \
--client-ca-file=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
--tls-cert-file=/yinzhengjie/certs/kubernetes/apiserver.pem \
--tls-private-key-file=/yinzhengjie/certs/kubernetes/apiserver-key.pem \
--kubelet-client-certificate=/yinzhengjie/certs/kubernetes/apiserver.pem \
--kubelet-client-key=/yinzhengjie/certs/kubernetes/apiserver-key.pem \
--service-account-key-file=/yinzhengjie/certs/kubernetes/sa.pub \
--service-account-signing-key-file=/yinzhengjie/certs/kubernetes/sa.key \
--service-account-issuer=https://kubernetes.default.svc.yinzhengjie.com \
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \
--authorization-mode=Node,RBAC \
--enable-bootstrap-token-auth=true \
--requestheader-client-ca-file=/yinzhengjie/certs/kubernetes/front-proxy-ca.pem \
--proxy-client-cert-file=/yinzhengjie/certs/kubernetes/front-proxy-client.pem \
--proxy-client-key-file=/yinzhengjie/certs/kubernetes/front-proxy-client-key.pem \
--requestheader-allowed-names=aggregator \
--requestheader-group-headers=X-Remote-Group \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-username-headers=X-Remote-User
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
2.启动服务
systemctl daemon-reload && systemctl enable --now kube-apiserver
systemctl status kube-apiserver
6 部署ControlerManager组件
6.1 所有节点创建配置文件
温馨提示:
- "--cluster-cidr"是Pod的网段地址，我们可以自行修改。
配置文件参考链接:
https://kubernetes.io/zh-cn/docs/reference/command-line-tools-reference/kube-controller-manager/
所有节点的controller-manager组件配置文件相同: (前提是证书文件存放的位置也要相同哟!)
cat > /usr/lib/systemd/system/kube-controller-manager.service << 'EOF'
[Unit]
Description=Jason Yin's Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-controller-manager \
--v=2 \
--root-ca-file=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
--cluster-signing-cert-file=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
--cluster-signing-key-file=/yinzhengjie/certs/kubernetes/k8s-ca-key.pem \
--service-account-private-key-file=/yinzhengjie/certs/kubernetes/sa.key \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-controller-manager.kubeconfig \
--leader-elect=true \
--use-service-account-credentials=true \
--node-monitor-grace-period=40s \
--node-monitor-period=5s \
--controllers=*,bootstrapsigner,tokencleaner \
--allocate-node-cidrs=true \
--cluster-cidr=10.100.0.0/16 \
--requestheader-client-ca-file=/yinzhengjie/certs/kubernetes/front-proxy-ca.pem \
--node-cidr-mask-size=24
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
6.2 启动controller-manager服务
systemctl daemon-reload
systemctl enable --now kube-controller-manager
systemctl status kube-controller-manager
7 部署Scheduler组件
7.1 所有节点创建配置文件
配置文件参考链接:
https://kubernetes.io/zh-cn/docs/reference/command-line-tools-reference/kube-scheduler/
所有节点的controller-manager组件配置文件相同: (前提是证书文件存放的位置也要相同哟!)
cat > /usr/lib/systemd/system/kube-scheduler.service <<'EOF'
[Unit]
Description=Jason Yin's Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-scheduler \
--v=2 \
--leader-elect=true \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-scheduler.kubeconfig
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
7.2 启动scheduler服务
systemctl daemon-reload
systemctl enable --now kube-scheduler
systemctl status kube-scheduler
8.创建Bootstrapping自动颁发kubelet证书配置
8.1 k8s-master01节点创建bootstrap-kubelet.kubeconfig文件
温馨提示:
- "--server"只想的是负载均衡器的IP地址，由负载均衡器对master节点进行反向代理哟。
- "--token"也可以自定义，但也要同时修改"bootstrap"的Secret的"token-id"和"token-secret"对应值哟;
1.设置集群
kubectl config set-cluster yinzhengjie-k8s \
--certificate-authority=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
--embed-certs=true \
--server=https://10.0.0.240:8443 \
--kubeconfig=/yinzhengjie/certs/kubeconfig/bootstrap-kubelet.kubeconfig
2.创建用户
kubectl config set-credentials tls-bootstrap-token-user \
--token=yindao.jasonyinzhengjie \
--kubeconfig=/yinzhengjie/certs/kubeconfig/bootstrap-kubelet.kubeconfig
3.将集群和用户进行绑定
kubectl config set-context tls-bootstrap-token-user@kubernetes \
--cluster=yinzhengjie-k8s \
--user=tls-bootstrap-token-user \
--kubeconfig=/yinzhengjie/certs/kubeconfig/bootstrap-kubelet.kubeconfig
4.配置默认的上下文
kubectl config use-context tls-bootstrap-token-user@kubernetes \
--kubeconfig=/yinzhengjie/certs/kubeconfig/bootstrap-kubelet.kubeconfig
8.2 所有master节点拷贝管理证书
温馨提示:
下面的操作我以k8s-master01为案例来操作的，实际上你可以使用所有的master节点完成下面的操作哟~
1.所有master都拷贝管理员的证书文件
[root@k8s-master01 ~]# mkdir -p /root/.kube
[root@k8s-master01 ~]# cp /yinzhengjie/certs/kubeconfig/kube-admin.kubeconfig /root/.kube/config
2.查看master组件，该组件官方在1.19+版本开始弃用，但是在1.28依旧没有移除哟~
[root@k8s-master01 ~]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy ok
[root@k8s-master01 ~]#
3.查看集群状态，如果未来cs组件移除了也没关系，我们可以使用"cluster-info"子命令查看集群状态
[root@k8s-master01 ~]# kubectl cluster-info
Kubernetes control plane is running at https://10.0.0.240:8443
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
[root@k8s-master01 ~]#
8.3 创建bootstrap-secret授权
1.创建配bootstrap-secret文件用于授权
[root@k8s-master01 ~]# cat > bootstrap-secret.yaml <<EOF
apiVersion: v1
kind: Secret
metadata:
name: bootstrap-token-yindao
namespace: kube-system
type: bootstrap.kubernetes.io/token
stringData:
description: "The default bootstrap token generated by 'kubelet '."
token-id: yindao
token-secret: jasonyinzhengjie
usage-bootstrap-authentication: "true"
usage-bootstrap-signing: "true"
auth-extra-groups: system:bootstrappers:default-node-token,system:bootstrappers:worker,system:bootstrappers:ingress
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: kubelet-bootstrap
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:node-bootstrapper
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:bootstrappers:default-node-token
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: node-autoapprove-bootstrap
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:certificates.k8s.io:certificatesigningrequests:nodeclient
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:bootstrappers:default-node-token
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: node-autoapprove-certificate-rotation
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:certificates.k8s.io:certificatesigningrequests:selfnodeclient
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:nodes
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:kube-apiserver-to-kubelet
rules:
- apiGroups:
- ""
resources:
- nodes/proxy
- nodes/stats
- nodes/log
- nodes/spec
- nodes/metrics
verbs:
- "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:kube-apiserver
namespace: ""
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:kube-apiserver-to-kubelet
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: User
name: kube-apiserver
EOF
2.应用bootstrap-secret配置文件
[root@k8s-master01 ~]# kubectl apply -f bootstrap-secret.yaml
secret/bootstrap-token-yindao created
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-certificate-rotation created
clusterrole.rbac.authorization.k8s.io/system:kube-apiserver-to-kubelet created
clusterrolebinding.rbac.authorization.k8s.io/system:kube-apiserver created
[root@k8s-master01 ~]#
9.部署worker节点
9.1 复制证书
1.k8s-master01节点分发证书到其他节点
cd /yinzhengjie/certs/
for NODE in k8s-master02 k8s-master03 k8s-worker04 k8s-worker05; do
echo $NODE
ssh $NODE "mkdir -p /yinzhengjie/certs/kube{config,rnetes}"
for FILE in k8s-ca.pem k8s-ca-key.pem front-proxy-ca.pem; do
scp kubernetes/$FILE $NODE:/yinzhengjie/certs/kubernetes/${FILE}
done
scp kubeconfig/bootstrap-kubelet.kubeconfig $NODE:/yinzhengjie/certs/kubeconfig/
done
2.worker节点进行验证
[root@k8s-worker05 ~]# ll /yinzhengjie/ -R
/yinzhengjie/:
total 0
drwxr-xr-x 4 root root 42 Nov 5 16:27 certs
/yinzhengjie/certs:
total 0
drwxr-xr-x 2 root root 42 Nov 5 16:27 kubeconfig
drwxr-xr-x 2 root root 72 Nov 5 16:27 kubernetes
/yinzhengjie/certs/kubeconfig:
total 4
-rw------- 1 root root 2243 Nov 5 16:27 bootstrap-kubelet.kubeconfig
/yinzhengjie/certs/kubernetes:
total 12
-rw-r--r-- 1 root root 1094 Nov 5 16:27 front-proxy-ca.pem
-rw------- 1 root root 1675 Nov 5 16:27 k8s-ca-key.pem
-rw-r--r-- 1 root root 1363 Nov 5 16:27 k8s-ca.pem
[root@k8s-worker05 ~]#
9.2 启动kubelet服务
温馨提示:
- 在"10-kubelet.con"文件中使用"--kubeconfig"指定的"kubelet.kubeconfig"文件并不存在，这个证书文件后期会自动生成;
- 对于"clusterDNS"是NDS地址，我们可以自定义，比如"10.200.0.254";
- “clusterDomain”对应的是域名信息，要和我们设计的集群保持一致，比如"yinzhengjie.com";
- "10-kubelet.conf"文件中的"ExecStart="需要写2次，否则可能无法启动kubelet;
具体实操:
1.所有节点创建工作目录
mkdir -p /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/
2.所有创建kubelet的配置文件
cat > /etc/kubernetes/kubelet-conf.yml <<'EOF'
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /yinzhengjie/certs/kubernetes/k8s-ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 10.200.0.254
clusterDomain: yinzhengjie.com
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
imagefs.available: 15%
memory.available: 100Mi
nodefs.available: 10%
nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s
EOF
3.所有节点配置kubelet service
cat > /usr/lib/systemd/system/kubelet.service <<'EOF'
[Unit]
Description=JasonYin's Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=containerd.service
Requires=containerd.service
[Service]
ExecStart=/usr/local/bin/kubelet
Restart=always
StartLimitInterval=0
RestartSec=10
[Install]
WantedBy=multi-user.target
EOF
4.所有节点配置kubelet service的配置文件
cat > /etc/systemd/system/kubelet.service.d/10-kubelet.conf <<'EOF'
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/yinzhengjie/certs/kubeconfig/bootstrap-kubelet.kubeconfig --kubeconfig=/yinzhengjie/certs/kubeconfig/kubelet.kubeconfig"
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml"
Environment="KUBELET_SYSTEM_ARGS=--container-runtime-endpoint=unix:///run/containerd/containerd.sock"
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node='' "
ExecStart=
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS
EOF
5.启动所有节点kubelet
systemctl daemon-reload
systemctl enable --now kubelet
systemctl status kubelet
6.在所有master节点上查看nodes信息。
[root@k8s-master01 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master01 NotReady <none> 30s v1.29.3
k8s-master02 NotReady <none> 31s v1.29.3
k8s-master03 NotReady <none> 31s v1.29.3
k8s-worker04 NotReady <none> 31s v1.29.3
k8s-worker05 NotReady <none> 31s v1.29.3
[root@k8s-master01 ~]#
7.可以查看到有相应的csr用户客户端的证书请求
[root@k8s-master01 ~]# kubectl get csr
NAME AGE SIGNERNAME REQUESTOR REQUESTEDDURATION CONDITION
csr-5j4xx 110s kubernetes.io/kube-apiserver-client-kubelet system:bootstrap:yindao <none> Approved,Issued
csr-9cmsh 110s kubernetes.io/kube-apiserver-client-kubelet system:bootstrap:yindao <none> Approved,Issued
csr-ght4f 110s kubernetes.io/kube-apiserver-client-kubelet system:bootstrap:yindao <none> Approved,Issued
csr-v6sbq 111s kubernetes.io/kube-apiserver-client-kubelet system:bootstrap:yindao <none> Approved,Issued
csr-xcq44 110s kubernetes.io/kube-apiserver-client-kubelet system:bootstrap:yindao <none> Approved,Issued
[root@k8s-master01 ~]#
9.3 启动kube-proxy服务
1.生成kube-proxy的csr文件
[root@k8s-master01 pki]# cat kube-proxy-csr.json
{
"CN": "system:kube-proxy",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-proxy",
"OU": "Kubernetes-manual"
}
]
}
[root@k8s-master01 pki]#
2.创建kube-proxy需要的证书文件
[root@k8s-master01 pki]# cfssl gencert \
-ca=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
-ca-key=/yinzhengjie/certs/kubernetes/k8s-ca-key.pem \
-config=k8s-ca-config.json \
-profile=kubernetes \
kube-proxy-csr.json | cfssljson -bare /yinzhengjie/certs/kubernetes/kube-proxy
[root@k8s-master01 pki]# ll /yinzhengjie/certs/kubernetes/kube-proxy*
-rw-r--r-- 1 root root 1045 Jan 9 09:43 /yinzhengjie/certs/kubernetes/kube-proxy.csr
-rw------- 1 root root 1679 Jan 9 09:43 /yinzhengjie/certs/kubernetes/kube-proxy-key.pem
-rw-r--r-- 1 root root 1464 Jan 9 09:43 /yinzhengjie/certs/kubernetes/kube-proxy.pem
[root@k8s-master01 pki]#
3.设置集群
[root@k8s-master01 pki]# kubectl config set-cluster yinzhengjie-k8s \
--certificate-authority=/yinzhengjie/certs/kubernetes/k8s-ca.pem \
--embed-certs=true \
--server=https://10.0.0.240:8443 \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-proxy.kubeconfig
4.设置一个用户项
[root@k8s-master01 pki]# kubectl config set-credentials system:kube-proxy \
--client-certificate=/yinzhengjie/certs/kubernetes/kube-proxy.pem \
--client-key=/yinzhengjie/certs/kubernetes/kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-proxy.kubeconfig
5.设置一个上下文环境
[root@k8s-master01 pki]# kubectl config set-context kube-proxy@kubernetes \
--cluster=yinzhengjie-k8s \
--user=system:kube-proxy \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-proxy.kubeconfig
6.使用默认的上下文
[root@k8s-master01 pki]# kubectl config use-context kube-proxy@kubernetes \
--kubeconfig=/yinzhengjie/certs/kubeconfig/kube-proxy.kubeconfig
7.将kube-proxy的systemd Service文件发送到其他节点
for NODE in k8s-master02 k8s-master03 k8s-worker04 k8s-worker05; do
echo $NODE
scp /yinzhengjie/certs/kubeconfig/kube-proxy.kubeconfig $NODE:/yinzhengjie/certs/kubeconfig/
done
8.所有节点创建kube-proxy.conf配置文件，
cat > /etc/kubernetes/kube-proxy.yml << EOF
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
bindAddress: 0.0.0.0
metricsBindAddress: 127.0.0.1:10249
clientConnection:
acceptConnection: ""
burst: 10
contentType: application/vnd.kubernetes.protobuf
kubeconfig: /yinzhengjie/certs/kubeconfig/kube-proxy.kubeconfig
qps: 5
clusterCIDR: 10.100.0.0/16
configSyncPeriod: 15m0s
conntrack:
max: null
maxPerCore: 32768
min: 131072
tcpCloseWaitTimeout: 1h0m0s
tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
masqueradeAll: false
masqueradeBit: 14
minSyncPeriod: 0s
ipvs:
masqueradeAll: true
minSyncPeriod: 5s
scheduler: "rr"
syncPeriod: 30s
mode: "ipvs"
nodeProtAddress: null
oomScoreAdj: -999
portRange: ""
udpIdelTimeout: 250ms
EOF
9.所有节点使用systemd管理kube-proxy
cat > /usr/lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Jason Yin's Kubernetes Proxy
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-proxy \
--config=/etc/kubernetes/kube-proxy.yml \
--v=2
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
10.所有节点启动kube-proxy
systemctl daemon-reload && systemctl enable --now kube-proxy
systemctl status kube-proxy
五.部署CNI网络插件
参考链接:
https://github.com/flannel-io/flannel
https://gitee.com/jasonyin2020/cloud-computing-stack/blob/linux89/linux89/manifests/22-cni/flannel/kube-flannel.yml#
1.下载flannel所需的二进制文件
[root@k8s-master01 ~]# wget https://github.com/containernetworking/plugins/releases/download/v1.2.0/cni-plugins-linux-amd64-v1.2.0.tgz
2.解压flannel所需的程序包
[root@k8s-master01 ~]# mkdir -p /opt/cni/bin
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# tar -C /opt/cni/bin -xzf cni-plugins-linux-amd64-v1.2.0.tgz
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# ll /opt/cni/bin/
total 68936
-rwxr-xr-x 1 root root 3859475 Jan 17 2023 bandwidth
-rwxr-xr-x 1 root root 4299004 Jan 17 2023 bridge
-rwxr-xr-x 1 root root 10167415 Jan 17 2023 dhcp
-rwxr-xr-x 1 root root 3986082 Jan 17 2023 dummy
-rwxr-xr-x 1 root root 4385098 Jan 17 2023 firewall
-rwxr-xr-x 1 root root 3870731 Jan 17 2023 host-device
-rwxr-xr-x 1 root root 3287319 Jan 17 2023 host-local
-rwxr-xr-x 1 root root 3999593 Jan 17 2023 ipvlan
-rwxr-xr-x 1 root root 3353028 Jan 17 2023 loopback
-rwxr-xr-x 1 root root 4029261 Jan 17 2023 macvlan
-rwxr-xr-x 1 root root 3746163 Jan 17 2023 portmap
-rwxr-xr-x 1 root root 4161070 Jan 17 2023 ptp
-rwxr-xr-x 1 root root 3550152 Jan 17 2023 sbr
-rwxr-xr-x 1 root root 2845685 Jan 17 2023 static
-rwxr-xr-x 1 root root 3437180 Jan 17 2023 tuning
-rwxr-xr-x 1 root root 3993252 Jan 17 2023 vlan
-rwxr-xr-x 1 root root 3586502 Jan 17 2023 vrf
[root@k8s-master01 ~]#
3.将软件包同步到集群其他节点
[root@k8s-master01 ~]# data_rsync.sh /opt/cni/bin/
===== rsyncing k8s-master02: bin =====
命令执行成功!
===== rsyncing k8s-master03: bin =====
命令执行成功!
===== rsyncing k8s-worker04: bin =====
命令执行成功!
===== rsyncing k8s-worker05: bin =====
命令执行成功!
[root@k8s-master01 ~]#
4.修改flannel官方的资源清单
apiVersion: v1
kind: Namespace
metadata:
labels:
k8s-app: flannel
pod-security.kubernetes.io/enforce: privileged
name: kube-flannel
---
apiVersion: v1
kind: ServiceAccount
metadata:
labels:
k8s-app: flannel
name: flannel
namespace: kube-flannel
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
k8s-app: flannel
name: flannel
rules:
- apiGroups:
- ""
resources:
- pods
verbs:
- get
- apiGroups:
- ""
resources:
- nodes
verbs:
- get
- list
- watch
- apiGroups:
- ""
resources:
- nodes/status
verbs:
- patch
- apiGroups:
- networking.k8s.io
resources:
- clustercidrs
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
labels:
k8s-app: flannel
name: flannel
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: flannel
subjects:
- kind: ServiceAccount
name: flannel
namespace: kube-flannel
---
apiVersion: v1
data:
cni-conf.json: |
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
net-conf.json: |
{
"Network": "10.100.0.0/16",
"Backend": {
"Type": "vxlan",
"Directrouting": true
}
}
kind: ConfigMap
metadata:
labels:
app: flannel
k8s-app: flannel
tier: node
name: kube-flannel-cfg
namespace: kube-flannel
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
labels:
app: flannel
k8s-app: flannel
tier: node
name: kube-flannel-ds
namespace: kube-flannel
spec:
selector:
matchLabels:
app: flannel
k8s-app: flannel
template:
metadata:
labels:
app: flannel
k8s-app: flannel
tier: node
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
containers:
- args:
- --ip-masq
- --kube-subnet-mgr
command:
- /opt/bin/flanneld
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: EVENT_QUEUE_DEPTH
value: "5000"
image: docker.io/flannel/flannel:v0.24.0
name: kube-flannel
resources:
requests:
cpu: 100m
memory: 50Mi
securityContext:
capabilities:
add:
- NET_ADMIN
- NET_RAW
privileged: false
volumeMounts:
- mountPath: /run/flannel
name: run
- mountPath: /etc/kube-flannel/
name: flannel-cfg
- mountPath: /run/xtables.lock
name: xtables-lock
hostNetwork: true
initContainers:
- args:
- -f
- /flannel
- /opt/cni/bin/flannel
command:
- cp
image: docker.io/flannel/flannel-cni-plugin:v1.2.0
name: install-cni-plugin
volumeMounts:
- mountPath: /opt/cni/bin
name: cni-plugin
- args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
command:
- cp
image: docker.io/flannel/flannel:v0.24.0
name: install-cni
volumeMounts:
- mountPath: /etc/cni/net.d
name: cni
- mountPath: /etc/kube-flannel/
name: flannel-cfg
priorityClassName: system-node-critical
serviceAccountName: flannel
tolerations:
- effect: NoSchedule
operator: Exists
volumes:
- hostPath:
path: /run/flannel
name: run
- hostPath:
path: /opt/cni/bin
name: cni-plugin
- hostPath:
path: /etc/cni/net.d
name: cni
- configMap:
name: kube-flannel-cfg
name: flannel-cfg
- hostPath:
path: /run/xtables.lock
type: FileOrCreate
name: xtables-lock
5.创建资源清单部署flannel程序
[root@k8s-master01 ~]# kubectl apply -f kube-flannel.yml
namespace/kube-flannel created
serviceaccount/flannel created
clusterrole.rbac.authorization.k8s.io/flannel created
clusterrolebinding.rbac.authorization.k8s.io/flannel created
configmap/kube-flannel-cfg created
daemonset.apps/kube-flannel-ds created
[root@k8s-master01 ~]#
6.观察flannel组件是否正常运行
[root@k8s-master01 ~]# kubectl get pods -A -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-flannel kube-flannel-ds-2b6dg 1/1 Running 0 2m59s 10.0.0.244 k8s-worker04 <none> <none>
kube-flannel kube-flannel-ds-4zjdd 1/1 Running 0 2m59s 10.0.0.245 k8s-worker05 <none> <none>
kube-flannel kube-flannel-ds-b2d96 1/1 Running 0 2m59s 10.0.0.242 k8s-master02 <none> <none>
kube-flannel kube-flannel-ds-s48rw 1/1 Running 0 2m59s 10.0.0.241 k8s-master01 <none> <none>
kube-flannel kube-flannel-ds-tz49n 1/1 Running 0 2m59s 10.0.0.243 k8s-master03 <none> <none>
[root@k8s-master01 ~]#
7.部署服务测试网络的可用性
[root@k8s-master01 ~]# cat deploy-apple.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: deployment-apple
spec:
replicas: 3
selector:
matchLabels:
apps: apple
template:
metadata:
labels:
apps: apple
spec:
containers:
- name: apple
image: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:apple
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: svc-apple
spec:
type: NodePort
selector:
apps: apple
ports:
- protocol: TCP
port: 80
targetPort: 80
nodePort: 8080
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# kubectl apply -f deploy-apple.yaml
deployment.apps/deployment-apple created
service/svc-apple created
[root@k8s-master01 ~]#
8.访问测试
http://10.0.0.243:8080/
可能会遇到的错误
1. Warning ClusterIPOutOfRange 27m (x10 over 54m) ipallocator-repair-controller Cluster IP [IPv4]:10.100.0.1 is not within the service CIDR 10.200.0.0/16; please recreate service
报错原因:
kube-proxy创建的svc和配置的svc不在一个网段。
解决方案:
查看"kube-proxy"的配置文件，观察是否在"clusterCIDR: 10.200.0.0/16"网段内。
2.[ERROR] Get "https://10.100.0.1:443/api?timeout=32s": tls: failed to verify certificate: x509: certificate is valid for 10.200.0.1, 10.0.0.240, 10.0.0.241, 10.0.0.242, 10.0.0.243, 10.0.0.244, 10.0.0.245, not 10.100.0.1
报错原因:
使用"10.100.0.1"作为svc地址，和证书预定义的svc的IP地址不匹配导致的错误。
解决方案:
如果依旧修改了kube-proxy的配置文件依旧无效，可以尝试先删除现有的svc应该就能解决问题。
举个例子:
[root@k8s-master01 ~]# kubectl get svc -A
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default kubernetes ClusterIP 10.100.0.1 <none> 443/TCP 5h45m
[root@k8s-master01 ~]#
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# kubectl delete svc kubernetes
service "kubernetes" deleted
[root@k8s-master01 ~]# kubectl get svc -A
No resources found
[root@k8s-master01 ~]# kubectl get svc -A
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default kubernetes ClusterIP 10.200.0.1 <none> 443/TCP 0s
[root@k8s-master01 ~]#
