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kubejoin，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.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
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
curl -o /etc/yum.repos.d/docker-ce.repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.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



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/

2.免密钥登录集群并配置同步脚本

    (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)所有节点设置相应的主机名及hosts文件解析
cat >> /etc/hosts <<'EOF'
10.0.0.201  k8s-master01
10.0.0.202  k8s-master02
10.0.0.203  k8s-master03
10.0.0.204  k8s-node01
10.0.0.205  k8s-node02
EOF


    (3)将“k8s-master01”节点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-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02)

# 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-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02)

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)测试同步脚本是否正常工作
cp /etc/hosts /tmp/
data_rsync.sh /tmp/hosts

3.Linux基础环境优化

    (1)所有节点关闭firewalld，selinux，NetworkManager
systemctl disable --now firewalld 
systemctl disable --now NetworkManager
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("crontab -e")
*/5 * * * * /usr/sbin/ntpdate ntp.aliyun.com


    (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'
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

4.所有节点升级Linux内核

    (1)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
yum -y localinstall kernel-ml*


    (2)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

    (3)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*

5.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)手动加载模块
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack

    (3)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

    (4)启动模块，如上图所示，这是Linux 3.10.X系列的内核模块，并不是我们需要的!
lsmod | grep --color=auto -e ip_vs -e nf_conntrack


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~

6.重启所有节点并检查内核和模块是否配置成功

(1)查看现有内核版本
uname -r

(2)检查默认加载的内核版本
grubby --default-kernel

(3)重启所有节点
reboot

(4)检查支持ipvs的内核模块是否加载成功，如上图所示，支持了更多的内核参数。
lsmod | grep --color=auto -e ip_vs -e nf_conntrack

(5)再次查看内核版本
uname -r

二.基础组件安装

1.所有节点部署docker环境

(1)所有节点安装docker
yum -y install docker-ce-19.03.* 

(2)将docker的CgroupDriver改成systemd，并配置镜像加速和私有镜像仓库地址
mkdir /etc/docker
cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "registry-mirrors": ["https://registry.docker-cn.com","https://tuv7rqqq.mirror.aliyuncs.com"],
  "insecure-registries": ["k8s-master01:5000","harbor253"],
  "log-driver": "json-file",
  "log-opts": {"max-size": "200m"},
  "storage-driver": "overlay2"
}
EOF

(3)设置开机自启动
systemctl daemon-reload && systemctl enable --now docker
systemctl status docker
docker info | grep "Cgroup Driver"
docker info | grep  "Registry Mirrors" -A 2


温馨提示:
    "https://registry.docker-cn.com"这个是docker在中国区域的镜像仓库，但在教室测试貌似网速部署很好，建议使用阿里源即可，若配置多个也没问题哈。

2.部署etcd和K8S程序

(1)下载K8S，etcd的软件包
# wget https://dl.k8s.io/v1.23.4/kubernetes-server-linux-amd64.tar.gz

wget https://dl.k8s.io/v1.23.15/kubernetes-server-linux-amd64.tar.gz
wget https://github.com/etcd-io/etcd/releases/download/v3.5.2/etcd-v3.5.2-linux-amd64.tar.gz



(2)解压K8S的二进制程序包到PATH环境变量路径
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}

(3)解压etcd的二进制程序包到PATH环境变量路径
tar -xf etcd-v3.5.2-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.2-linux-amd64/etcd{,ctl}

(4)将组建发送到其他节点
MasterNodes='k8s-master02 k8s-master03'
WorkNodes='k8s-node01 k8s-node02'
for NODE in $MasterNodes; do echo $NODE; scp /usr/local/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} $NODE:/usr/local/bin/; scp /usr/local/bin/etcd* $NODE:/usr/local/bin/; done
for NODE in $WorkNodes; do     scp /usr/local/bin/kube{let,-proxy} $NODE:/usr/local/bin/ ; done


(5)查看kubernetes的版本
kube-apiserver --version
kube-controller-manager --version
kube-scheduler --version
etcdctl version
kubelet --version
kube-proxy --version
kubectl version



(6)所有节点创建工作目录
mkdir -p /opt/cni/bin

(7)切换分支，版本取决于所部署的K8S版本
git clone https://github.com/dotbalo/k8s-ha-install.git
cd k8s-ha-install/
git checkout manual-installation-v1.23.x

三.生成K8S集群证书文件

1.k8s-master01节点下载证书管理工具

(1)k8s-master01节点下载证书管理工具(该证书文件可以提前下载好发给大家即可)
wget "https://pkg.cfssl.org/R1.2/cfssl_linux-amd64" -O /usr/local/bin/cfssl
wget "https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64" -O /usr/local/bin/cfssljson
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson

(2)所有Master节点创建etcd证书目录
mkdir /etc/etcd/ssl -p

(3)所有节点创建kubernetes相关目录
mkdir -p /etc/kubernetes/pki

2.k8s-master01节点生成etcd证书

(1)生成etcd CA证书和CA证书的key
cd /root/k8s-ha-install/pki
cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca


(2)颁发证书
cfssl gencert \
   -ca=/etc/etcd/ssl/etcd-ca.pem \
   -ca-key=/etc/etcd/ssl/etcd-ca-key.pem \
   -config=ca-config.json \
   -hostname=127.0.0.1,k8s-master01,k8s-master02,k8s-master03,10.0.0.201,10.0.0.202,10.0.0.203 \
   -profile=kubernetes \
   etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd

(3)将证书复制到其他节点
MasterNodes='k8s-master02 k8s-master03'

for NODE in $MasterNodes; do
     ssh $NODE "mkdir -p /etc/etcd/ssl"
     for FILE in etcd-ca-key.pem  etcd-ca.pem  etcd-key.pem  etcd.pem; do
       scp /etc/etcd/ssl/${FILE} $NODE:/etc/etcd/ssl/${FILE}
     done
 done

3.k8s组件apiserver相关证书

(1)生成kubernetes证书
cd /root/k8s-ha-install/pki
cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca


(2)生成apiserver的客户端证书
cfssl gencert   -ca=/etc/kubernetes/pki/ca.pem   -ca-key=/etc/kubernetes/pki/ca-key.pem   -config=ca-config.json   -hostname=10.96.0.1,10.0.0.250,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,10.0.0.201,10.0.0.202,10.0.0.203   -profile=kubernetes   apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver

(3)生成apiserver的聚合证书
cfssl gencert   -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca 
cfssl gencert   -ca=/etc/kubernetes/pki/front-proxy-ca.pem   -ca-key=/etc/kubernetes/pki/front-proxy-ca-key.pem   -config=ca-config.json   -profile=kubernetes   front-proxy-client-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-client


温馨提示:
    (1)"10.96.0.0"是k8s service的网段，如果说需要更改k8s service网段，那就需要更改"10.96.0.1";
    (2)如果不是高可用集群，10.0.0.250为Master01的IP，我这里这个是高可用的vip;

4.k8s组件controller manager相关证书

生成 controller-manage的证书
cfssl gencert \
   -ca=/etc/kubernetes/pki/ca.pem \
   -ca-key=/etc/kubernetes/pki/ca-key.pem \
   -config=ca-config.json \
   -profile=kubernetes \
   manager-csr.json | cfssljson -bare /etc/kubernetes/pki/controller-manager


# 注意，如果不是高可用集群，10.0.0.250:6443改为master01的地址，6443改为apiserver的端口，默认是6443
# set-cluster：设置一个集群项
kubectl config set-cluster kubernetes \
     --certificate-authority=/etc/kubernetes/pki/ca.pem \
     --embed-certs=true \
     --server=https://10.0.0.250:6443 \
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

# set-credentials 设置一个用户项
kubectl config set-credentials system:kube-controller-manager \
     --client-certificate=/etc/kubernetes/pki/controller-manager.pem \
     --client-key=/etc/kubernetes/pki/controller-manager-key.pem \
     --embed-certs=true \
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

# 设置一个环境项，一个上下文
kubectl config set-context system:kube-controller-manager@kubernetes \
    --cluster=kubernetes \
    --user=system:kube-controller-manager \
    --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

# 使用某个环境当做默认环境
kubectl config use-context system:kube-controller-manager@kubernetes \
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

5.k8s组件scheduler相关证书

cfssl gencert \
   -ca=/etc/kubernetes/pki/ca.pem \
   -ca-key=/etc/kubernetes/pki/ca-key.pem \
   -config=ca-config.json \
   -profile=kubernetes \
   scheduler-csr.json | cfssljson -bare /etc/kubernetes/pki/scheduler

# 注意，如果不是高可用集群，10.0.0.250:6443改为master01的地址，6443改为apiserver的端口，默认是6443
kubectl config set-cluster kubernetes \
     --certificate-authority=/etc/kubernetes/pki/ca.pem \
     --embed-certs=true \
     --server=https://10.0.0.250:6443 \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

kubectl config set-credentials system:kube-scheduler \
     --client-certificate=/etc/kubernetes/pki/scheduler.pem \
     --client-key=/etc/kubernetes/pki/scheduler-key.pem \
     --embed-certs=true \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

kubectl config set-context system:kube-scheduler@kubernetes \
     --cluster=kubernetes \
     --user=system:kube-scheduler \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

kubectl config use-context system:kube-scheduler@kubernetes \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

6.生成admin的证书

cfssl gencert \
   -ca=/etc/kubernetes/pki/ca.pem \
   -ca-key=/etc/kubernetes/pki/ca-key.pem \
   -config=ca-config.json \
   -profile=kubernetes \
   admin-csr.json | cfssljson -bare /etc/kubernetes/pki/admin

# 注意，如果不是高可用集群，10.0.0.250:6443改为master01的地址，6443改为apiserver的端口，默认是6443
kubectl config set-cluster kubernetes     --certificate-authority=/etc/kubernetes/pki/ca.pem     --embed-certs=true     --server=https://10.0.0.250:6443     --kubeconfig=/etc/kubernetes/admin.kubeconfig

kubectl config set-credentials kubernetes-admin     --client-certificate=/etc/kubernetes/pki/admin.pem     --client-key=/etc/kubernetes/pki/admin-key.pem     --embed-certs=true     --kubeconfig=/etc/kubernetes/admin.kubeconfig

kubectl config set-context kubernetes-admin@kubernetes     --cluster=kubernetes     --user=kubernetes-admin     --kubeconfig=/etc/kubernetes/admin.kubeconfig

kubectl config use-context kubernetes-admin@kubernetes     --kubeconfig=/etc/kubernetes/admin.kubeconfig



温馨提示:
    我们用同样的命令生成了admin.kubeconfig，scheduler.kubeconfig，controller-manager.kubeconfig，它们之间是如何区分的？

    我们生成的证书会定义一个用户 admin，它是属于 system:masters 这个组，k8s 安装的时候会有一个 clusterrole，它是一个集群角色，相当于一个配置，它有着集群最高的管理权限，同时会创建一个 clusterrolebinding，它会把 admin 绑到 system:masters 这个组上，然后这个组上的所有用户都会有这个集群的权限

7.创建ServiceAccount Key

    (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
openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub


    (2)发送证书至其他节点
for NODE in k8s-master02 k8s-master03; 
  do 
     for FILE in $(ls /etc/kubernetes/pki | grep -v etcd); 
     do 
        scp /etc/kubernetes/pki/${FILE} $NODE:/etc/kubernetes/pki/${FILE};
     done; 
     for FILE in admin.kubeconfig controller-manager.kubeconfig scheduler.kubeconfig; 
     do 
        scp /etc/kubernetes/${FILE} $NODE:/etc/kubernetes/${FILE};
     done;
done


    (3)查看ca证书的有效期
如上图所示，我此处给证书的有效期是100年。

四.二进制高可用及etcd配置

1.创建配置文件

(1)k8s-master01节点的配置文件
cat > /etc/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://10.0.0.201:2380'
listen-client-urls: 'https://10.0.0.201:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.0.0.201:2380'
advertise-client-urls: 'https://10.0.0.201:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://10.0.0.201:2380,k8s-master02=https://10.0.0.202:2380,k8s-master03=https://10.0.0.203:2380'
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: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/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
cat > /etc/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://10.0.0.202:2380'
listen-client-urls: 'https://10.0.0.202:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.0.0.202:2380'
advertise-client-urls: 'https://10.0.0.202:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://10.0.0.201:2380,k8s-master02=https://10.0.0.202:2380,k8s-master03=https://10.0.0.203:2380'
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: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF


(2)k8s-master03节点的配置文件
cat > /etc/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://10.0.0.203:2380'
listen-client-urls: 'https://10.0.0.203:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.0.0.203:2380'
advertise-client-urls: 'https://10.0.0.203:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://10.0.0.201:2380,k8s-master02=https://10.0.0.202:2380,k8s-master03=https://10.0.0.203:2380'
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: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF

2.所有节点启动服务

(1)创建启动脚本
cat > /usr/lib/systemd/system/etcd.service <<'EOF'
[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target

[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
Alias=etcd3.service
EOF


(2)启动服务
mkdir /etc/kubernetes/pki/etcd
ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
systemctl daemon-reload
systemctl enable --now etcd
systemctl status etcd

(3)查看etcd状态
etcdctl --endpoints="10.0.0.201:2379,10.0.0.202:2379,10.0.0.203:2379" --cacert=/etc/kubernetes/pki/etcd/etcd-ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem  endpoint status --write-out=table


温馨提示:
    etcd集群启动成功如上图所示。

五.高可用配置（haproxy+keepalived）

1.所有节点(k8s-master0[1-3])安装keepalived和haproxy

yum -y install keepalived haproxy

2.所有节点(k8s-master0[1-3])配置haproxy，配置文件各个节点相同

(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-in
  bind *:33305
  mode http
  option httplog
  monitor-uri /monitor

frontend k8s-master
  bind 0.0.0.0:16443
  bind 127.0.0.1:16443
  mode tcp
  option tcplog
  tcp-request inspect-delay 5s
  default_backend k8s-master

backend k8s-master
  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   10.0.0.201:6443  check
  server k8s-master02   10.0.0.202:6443  check
  server k8s-master03   10.0.0.203:6443  check
EOF

3.所有节点(k8s-master0[1-3])配置keepalived，配置文件各节点不同

(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
cat > /etc/keepalived/keepalived.conf <<'EOF'
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5
    weight -5
    fall 2  
    rise 1
}
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    mcast_src_ip 10.0.0.201
    virtual_router_id 51
    priority 101
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        10.0.0.250
    }
    track_script {
       chk_apiserver
    }
}
EOF


(3)"k8s-master02"节点创建配置文件
cat > /etc/keepalived/keepalived.conf <<'EOF'
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5
    weight -5
    fall 2  
    rise 1
}
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    mcast_src_ip 10.0.0.202
    virtual_router_id 51
    priority 101
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        10.0.0.250
    }
    track_script {
       chk_apiserver
    }
}
EOF

(4)"k8s-master03"节点创建配置文件
cat > /etc/keepalived/keepalived.conf <<'EOF'
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5
    weight -5
    fall 2  
    rise 1
}
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    mcast_src_ip 10.0.0.203
    virtual_router_id 51
    priority 101
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        10.0.0.250
    }
    track_script {
       chk_apiserver
    }
}
EOF

4.所有节点(k8s-master0[1-3])配置KeepAlived健康检查文件

(1)创建检查脚本
cat > /etc/keepalived/check_apiserver.sh <<'EOF'
#!/bin/bash

err=0
for k in $(seq 1 3)
do
    check_code=$(pgrep haproxy)
    if [[ $check_code == "" ]]; then
        err=$(expr $err + 1)
        sleep 1
        continue
    else
        err=0
        break
    fi
done

if [[ $err != "0" ]]; then
    echo "systemctl stop keepalived"
    /usr/bin/systemctl stop keepalived
    exit 1
else
    exit 0
fi
EOF


(2)添加执行权限
chmod +x /etc/keepalived/check_apiserver.sh

温馨提示:
    (1)我们通过KeepAlived虚拟出来一个VIP，VIP会配置到一个master节点上面，它会通过haproxy暴露的16443的端口反向代理到我们的三个master节点上面，所以我们可以通过VIP的地址加上16443访问到我们的API server;
    (2)健康检查会检查haproxy的状态，三次失败就会将KeepAlived停掉，停掉之后KeepAlived会跳到其他的节点;

5.启动服务

(1)启动harproxy
systemctl daemon-reload
systemctl enable --now haproxy

(2)启动keepalived
systemctl enable --now keepalived

(3)查看VIP，如上图所示
ip a

六.二进制K8s master组件配置

1.所有节点(k8s-master0[1-3])Apiserver服务启动

(1)所有节点(k8s-master0[1-3])创建工作目录
mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes


(2)k8s-master01节点创建配置文件
cat > /usr/lib/systemd/system/kube-apiserver.service << 'EOF'
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --insecure-port=0  \
      --advertise-address=10.0.0.201 \
      --service-cluster-ip-range=10.96.0.0/12  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://10.0.0.201:2379,https://10.0.0.202:2379,https://10.0.0.203:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --service-account-signing-key-file=/etc/kubernetes/pki/sa.key  \
      --service-account-issuer=https://kubernetes.default.svc.cluster.local \
      --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=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/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
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target
EOF


(3)k8s-master02节点创建配置文件
cat > /usr/lib/systemd/system/kube-apiserver.service <<'EOF'
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --insecure-port=0  \
      --advertise-address=10.0.0.202 \
      --service-cluster-ip-range=10.96.0.0/12  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://10.0.0.201:2379,https://10.0.0.202:2379,https://10.0.0.203:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --service-account-signing-key-file=/etc/kubernetes/pki/sa.key  \
      --service-account-issuer=https://kubernetes.default.svc.cluster.local \
      --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=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/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
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target
EOF


(4)k8s-master03节点创建配置文件
cat > /usr/lib/systemd/system/kube-apiserver.service << 'EOF'
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --insecure-port=0  \
      --advertise-address=10.0.0.203 \
      --service-cluster-ip-range=10.96.0.0/12  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://10.0.0.201:2379,https://10.0.0.202:2379,https://10.0.0.203:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --service-account-signing-key-file=/etc/kubernetes/pki/sa.key  \
      --service-account-issuer=https://kubernetes.default.svc.cluster.local \
      --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=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/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
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target
EOF


(5)启动服务
systemctl daemon-reload && systemctl enable --now kube-apiserver && systemctl status kube-apiserver

2.所有节点(k8s-master0[1-3])ControllerManager服务启动

(1)所有节点创建配置文件
cat > /usr/lib/systemd/system/kube-controller-manager.service << 'EOF'
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-controller-manager \
      --v=2 \
      --logtostderr=true \
      --address=127.0.0.1 \
      --root-ca-file=/etc/kubernetes/pki/ca.pem \
      --cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem \
      --cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem \
      --service-account-private-key-file=/etc/kubernetes/pki/sa.key \
      --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \
      --leader-elect=true \
      --use-service-account-credentials=true \
      --node-monitor-grace-period=40s \
      --node-monitor-period=5s \
      --pod-eviction-timeout=2m0s \
      --controllers=*,bootstrapsigner,tokencleaner \
      --allocate-node-cidrs=true \
      --cluster-cidr=172.16.0.0/12 \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
      --node-cidr-mask-size=24

Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target
EOF

(2)启动服务，查看状态如上图所示
systemctl daemon-reload
systemctl enable --now kube-controller-manager
systemctl  status kube-controller-manager

3.所有节点(k8s-master0[1-3])Scheduler服务启动

(1)所有节点创建配置文件
cat > /usr/lib/systemd/system/kube-scheduler.service <<'EOF'
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-scheduler \
      --v=2 \
      --logtostderr=true \
      --address=127.0.0.1 \
      --leader-elect=true \
      --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target
EOF


(2)启动服务并查看状态，如上图所示
systemctl daemon-reload
systemctl enable --now kube-scheduler
systemctl  status kube-scheduler

七.创建Bootstrapping自动颁发证书

1.k8s-master01节点创建bootstrap-kubelet.kubeconfig文件

cd /root/k8s-ha-install/bootstrap
kubectl config set-cluster kubernetes     --certificate-authority=/etc/kubernetes/pki/ca.pem     --embed-certs=true     --server=https://10.0.0.250:6443     --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config set-credentials tls-bootstrap-token-user     --token=c8ad9c.2e4d610cf3e7426e --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config set-context tls-bootstrap-token-user@kubernetes     --cluster=kubernetes     --user=tls-bootstrap-token-user     --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config use-context tls-bootstrap-token-user@kubernetes     --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig


温馨提示:
    "bootstrap-kubelet.kubeconfig"是一个keepalived用来向apiserver申请证书的文件，如果要修改bootstrap.secret.yaml的token-id和token-secret，需要保证c8ad9c字符串一致的，并且位数是一样的。还要保证上个命令的黄色字体：c8ad9c.2e4d610cf3e7426e与你修改的字符串要一致

2.所有master节点拷贝管理证书

mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config

3.创建bootstrap

kubectl create -f bootstrap.secret.yaml

八.部署Node节点

1.拷贝证书

cd /etc/kubernetes/
for NODE in k8s-master02 k8s-master03 k8s-node01 k8s-node02; do
     ssh $NODE mkdir -p /etc/kubernetes/pki /etc/etcd/ssl /etc/etcd/ssl
     for FILE in etcd-ca.pem etcd.pem etcd-key.pem; do
       scp /etc/etcd/ssl/$FILE $NODE:/etc/etcd/ssl/
     done
     for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig; do
       scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE}
done
done


温馨提示:
    node节点使用自动颁发证书的形式配置

2.Kubelet配置

    (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)所有节点配置kubelet service
cat >  /usr/lib/systemd/system/kubelet.service <<'EOF'
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service

[Service]
ExecStart=/usr/local/bin/kubelet
Restart=always
StartLimitInterval=0
RestartSec=10

[Install]
WantedBy=multi-user.target
EOF


    (3)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=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig"
Environment="KUBELET_SYSTEM_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin"
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.2"
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



    (4)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: /etc/kubernetes/pki/ca.pem
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 10.96.0.10
clusterDomain: cluster.local
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

    (5)启动所有节点kubelet
systemctl daemon-reload
systemctl enable --now kubelet
systemctl status kubelet


    (6)在master101节点上查看node信息，如上图所示。
kubectl get nodes

3.kube-proxy配置

(1)在“k8s-master01”节点生成"/etc/kubernetes/kube-proxy.kubeconfig"配置文件
cd /root/k8s-ha-install
kubectl -n kube-system create serviceaccount kube-proxy
kubectl create clusterrolebinding system:kube-proxy         --clusterrole system:node-proxier         --serviceaccount kube-system:kube-proxy
SECRET=$(kubectl -n kube-system get sa/kube-proxy \
    --output=jsonpath='{.secrets[0].name}')
JWT_TOKEN=$(kubectl -n kube-system get secret/$SECRET \
--output=jsonpath='{.data.token}' | base64 -d)
PKI_DIR=/etc/kubernetes/pki
K8S_DIR=/etc/kubernetes
kubectl config set-cluster kubernetes     --certificate-authority=/etc/kubernetes/pki/ca.pem     --embed-certs=true     --server=https://10.0.0.250:6443     --kubeconfig=${K8S_DIR}/kube-proxy.kubeconfig
kubectl config set-credentials kubernetes     --token=${JWT_TOKEN}     --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config set-context kubernetes     --cluster=kubernetes     --user=kubernetes     --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config use-context kubernetes     --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig


(2)在“k8s-master01”将kube-proxy的systemd Service文件发送到其他节点
for NODE in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02; do
     scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
done


(3)所有节点创建kube-proxy.conf配置文件
cat > /etc/kubernetes/kube-proxy.conf << EOF
KUBE_PROXY_OPTS="--logtostderr=false \\
    --v=2 \\
    --log-dir=/var/log/kubernetes/ \\
    --config=/etc/kubernetes/kube-proxy-config.yml"
EOF

# 注意修改各个节点的"hostnameOverride"的值哟
cat > /etc/kubernetes/kube-proxy-config.yml << EOF
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
metricsBindAddress: 0.0.0.0:10249
clientConnection:
 kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
hostnameOverride: k8s-node02
clusterCIDR: 172.30.110.0/24
EOF


(4)所有节点使用systemd管理kube-proxy
cat > /usr/lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Proxy
After=network.target

[Service]
EnvironmentFile=/etc/kubernetes/kube-proxy.conf
ExecStart=/usr/local/bin/kube-proxy \$KUBE_PROXY_OPTS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF


(5)所有节点启动kube-proxy
systemctl daemon-reload
systemctl enable --now kube-proxy
systemctl status kube-proxy



温馨提示:
    如果更改了集群Pod的网段，需要更改kube-proxy.conf的clusterCIDR参数，比如我上面的案例自定义的网段为"172.30.110.0/24"。

九.部署网络插件

1.部署calico网络插件

cd /root/k8s-ha-install/calico/

# 修改calico-etcd.yaml的以下位置
sed -i 's#etcd_endpoints: "http://<ETCD_IP>:<ETCD_PORT>"#etcd_endpoints: "https://10.0.0.201:2379,https://10.0.0.202:2379,https://10.0.0.203:2379"#g' calico-etcd.yaml

ETCD_CA=`cat /etc/kubernetes/pki/etcd/etcd-ca.pem | base64 | tr -d '\n'`
ETCD_CERT=`cat /etc/kubernetes/pki/etcd/etcd.pem | base64 | tr -d '\n'`
ETCD_KEY=`cat /etc/kubernetes/pki/etcd/etcd-key.pem | base64 | tr -d '\n'`

sed -i "s@# etcd-key: null@etcd-key: ${ETCD_KEY}@g; s@# etcd-cert: null@etcd-cert: ${ETCD_CERT}@g; s@# etcd-ca: null@etcd-ca: ${ETCD_CA}@g" calico-etcd.yaml

sed -i 's#etcd_ca: ""#etcd_ca: "/calico-secrets/etcd-ca"#g; s#etcd_cert: ""#etcd_cert: "/calico-secrets/etcd-cert"#g; s#etcd_key: "" #etcd_key: "/calico-secrets/etcd-key" #g' calico-etcd.yaml

# 更改此处为自己的pod网段
POD_SUBNET="172.30.110.0/24"

# 注意下面的这个步骤是把calico-etcd.yaml文件里面的CALICO_IPV4POOL_CIDR下的网段改成自己的Pod网段，也就是把192.168.x.x/16改成自己的集群网段，并打开注释，建议直接写IP地址网段，因此写的不是IP地址会报错，我有踩到坑。
sed -i 's@# - name: CALICO_IPV4POOL_CIDR@- name: CALICO_IPV4POOL_CIDR@g; s@#   value: "192.168.0.0/16"@  value: '"${POD_SUBNET}"'@g' calico-etcd.yaml





温馨提示:
    上述所有步骤均可以省略，就会出错。需要手动修改你自己集群的证书文件内容，我发你的你用不了！需要手动修改"etcd-key","etcd-cert"和"etcd-ca"。
        - etcd证书文件存储路径:
            /etc/kubernetes/pki/etcd/

        - base64编码文件内容
            cat <file> | base64 -w 0


最终执行创建网络:
kubectl apply -f calico-etcd.yaml

2.观察各节点是否部署成功

kubectl get po,no -n kube-system -o wide

十.附加组件部署

1.部署CoreDNS

(1)部署coreDNS
cd /root/k8s-ha-install/
# sed -i "s#10.96.0.1#10.96.0.10#g" CoreDNS/coredns.yaml  # 修改"clusterIP"的值。
kubectl create -f CoreDNS/coredns.yaml


安装最新版CoreDNS（不推荐）
git clone https://github.com/coredns/deployment.git
cd deployment/kubernetes
./deploy.sh -s -i 10.96.0.10 | kubectl apply -f -

(2)查看状态
kubectl get po -n kube-system -l k8s-app=kube-dns


(3)验证DNS组件
dig @10.96.0.10 metrics-server.kube-system.svc.cluster.local +short

2.部署Metrics Server

(1)部署Metrics Server
cd /root/k8s-ha-install/metrics-server
kubectl  create -f . 

(2)查看node和pod的监控状态
kubectl top no
kubectl top po -A

3.安装dashboard

(1)安装dashboard服务
cd /root/k8s-ha-install/dashboard/
kubectl  create -f .


(2)查看token并访问dashboard，如下图所示
kubectl get svc kubernetes-dashboard -n kubernetes-dashboard
kubectl get pod -A -owide | grep dashboard
kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')


温馨提示:
    可以在官方dashboard查看到最新版dashboard，官方GitHub地址：
        https://github.com/kubernetes/dashboard

    (1)部署最新版本，如上图所示，注意观察dashboard是否支持对应的K8S版本哟！（建议将svc的类型手动修改为NodePort类型进行暴露哟!）
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.5.1/aio/deploy/recommended.yaml


    (2)创建管理员用户（安装最新版本的时候）
cat > admin.yaml <<'EOF'
# 添加以下内容
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding 
metadata: 
  name: admin-user
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kube-system
EOF
kubectl apply -f admin.yaml -n kube-system

十一.彩蛋篇

1.自动补全功能

- docker自动补全功能
yum -y install bash-completion
source /usr/share/bash-completion/bash_completion


- kubectl 自动补全功能
echo "source <(kubectl completion bash)" >> ~/.bashrc && source ~/.bashrc

2.多master管理K8S集群验证

注意哈，如果有任意一个master节点有问题，请验证kubeconfig文件是否有配置。


参考指令:
    mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config

3.验证集群高可用

如上图所示，K8S集群的VIP最开始在"k8s-master03"节点。


接下来，我们将该节点停机后，并不会影响K8S集群正常使用哟。

十二.可能会遇到的报错

1.Invalid CIDR specified in CALICO_IPV4POOL_CIDR 'POD_CIDR'

问题原因:
    如下图所示，这是由于我配置的"CALICO_IPV4POOL_CIDR"参数无效导致的，该值应该是一个IP地址哟。


解决方案:
    修改正确的IP地址即可。

vim calico-etcd.yaml 
...

365             - name: CALICO_IPV4POOL_CIDR
366               value: "172.30.110.0/24"

二进制部署Kubernetes 1.23.15版本高可用集群实战

前置知识: 部署Kubernetes集群的方式

一.K8S二进制部署准备环境

1.所有节点安装常用的软件包

2.免密钥登录集群并配置同步脚本

3.Linux基础环境优化

4.所有节点升级Linux内核

5.所有节点安装ipvsadm以实现kube-proxy的负载均衡

6.重启所有节点并检查内核和模块是否配置成功

二.基础组件安装

1.所有节点部署docker环境

2.部署etcd和K8S程序

三.生成K8S集群证书文件

1.k8s-master01节点下载证书管理工具

2.k8s-master01节点生成etcd证书

3.k8s组件apiserver相关证书

4.k8s组件controller manager相关证书

5.k8s组件scheduler相关证书

6.生成admin的证书

7.创建ServiceAccount Key

四.二进制高可用及etcd配置

1.创建配置文件

2.所有节点启动服务

五.高可用配置（haproxy+keepalived）

1.所有节点(k8s-master0[1-3])安装keepalived和haproxy

2.所有节点(k8s-master0[1-3])配置haproxy，配置文件各个节点相同

3.所有节点(k8s-master0[1-3])配置keepalived，配置文件各节点不同

4.所有节点(k8s-master0[1-3])配置KeepAlived健康检查文件

5.启动服务

六.二进制K8s master组件配置

1.所有节点(k8s-master0[1-3])Apiserver服务启动

2.所有节点(k8s-master0[1-3])ControllerManager服务启动

3.所有节点(k8s-master0[1-3])Scheduler服务启动

七.创建Bootstrapping自动颁发证书

1.k8s-master01节点创建bootstrap-kubelet.kubeconfig文件

2.所有master节点拷贝管理证书

3.创建bootstrap

八.部署Node节点

1.拷贝证书

2.Kubelet配置

3.kube-proxy配置

九.部署网络插件

1.部署calico网络插件

2.观察各节点是否部署成功

十.附加组件部署

1.部署CoreDNS

2.部署Metrics Server

3.安装dashboard

十一.彩蛋篇

1.自动补全功能

2.多master管理K8S集群验证

3.验证集群高可用

十二.可能会遇到的报错

1.Invalid CIDR specified in CALICO_IPV4POOL_CIDR 'POD_CIDR'

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