Centos7 安装 Kubernetes 集群详细步骤（安装篇）

Kubernetes 是goole开源的大规模容器集群管理系统，使用centos7 自带的Kubernetes 组件、分布式键值存储系统etcd 以及flannel 实现Docker容器中跨容器访问。

（集群环境需要ntp时钟一致，因为是云的机器，系统默认有时钟核对）

第一步组件安装

Master节点：

systemctl stop firewalld && sudo systemctl disable firewalld

yum install -y kubernetes etcd docker flannel     

Node节点：

systemctl stop firewalld && sudo systemctl disable firewalld

yum install -y kubernetes  docker flannel

第二步配置

Master:

hostnamectl set-hostname k8s_master

vi /etc/hosts

192.168.234.130   k8s_master

192.168.234.131   k8s_node1

192.168.234.132   k8s_node2

etcd配置 

vi /etc/etcd/etcd.conf  

ETCD_NAME=default

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"

ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"

ETCD_ADVERTISE_CLIENT_URLS=http://localhost:2379

apiserver 配置

vi /etc/kubernetes/apiserver

KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"   (apiserver绑定主机的非安全IP地址）

KUBE_API_PORT="--port=8080"                                          (apiserver绑定主机的非安全端口号）

KUBELET_PORT="--kubelet-port=10250"

KUBE_ETCD_SERVERS="--etcd-servers=http://192.168.234.130:2379"

KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=192.168.234.0/24" （虚机同一网段）

KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"

KUBE_API_ARGS=""

Kubelet配置

vi /etc/kubernetes/kubelet

KUBELET_ADDRESS="--address=0.0.0.0"

KUBELET_PORT="--port=10250"

KUBELET_HOSTNAME="--hostname-override=192.168.234.130"

KUBELET_API_SERVER="--api-servers=http://192.168.234.130:8080"

KUBELET_POD_INFRA_CONTAINER="--pod-infra-Container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"

KUBELET_ARGS=""

config配置 

vi /etc/kubernetes/config

KUBE_LOGTOSTDERR="--logtostderr=true"

KUBE_LOG_LEVEL="--v=0"

KUBE_ALLOW_PRIV="--allow-privileged=false"

KUBE_MASTER="--master=http://192.168.234.130:8080"

scheduler和 proxy 暂时没有用到，就不需要配置

flannel 配置

vi /etc/sysconfig/flanneld  

FLANNEL_ETCD="http://192.168.234.130:2379"

FLANNEL_ETCD_KEY="/atomic.io/network"

etcdctl  set修改get查询。不管是修改还是创建的时候，配置文件必须完整/coreos.com/network/config，要不然启动会报错。

添加网络：

systemctl enable etcd.service

systemctl start etcd.service

etcdctl mk //atomic.io/network/config '{"Network":"172.17.0.0/16"}'  创建

etcdctl rm //atomic.io/network/config '{"Network":"172.17.0.0/16"}'   删除

Master启动：

for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler   kube-proxy  kubelet docker flanneld   ; do systemctl restart   $SERVICES; systemctl enable $SERVICES; systemctl status $SERVICES; done;

node配置：

hostnamectl set-hostname k8s_node1/2

Kubelet配置

vi   /etc/kubernetes/kubelet

KUBELET_ADDRESS="--address=0.0.0.0"

KUBELET_PORT="--port=10250"

KUBELET_HOSTNAME="--hostname-override=192.168.234.131"   (相应节点IP)

KUBELET_API_SERVER="--api-servers=http://192.168.234.130:8080"     （master节点IP）

KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"

KUBELET_ARGS=" "

config配置 

vi  /etc/kubernetes/config  

KUBE_LOGTOSTDERR="--logtostderr=true"

KUBE_LOG_LEVEL="--v=0"

KUBE_ALLOW_PRIV="--allow-privileged=false"

KUBE_MASTER="--master=http://192.168.234.130:8080"

flannel 配置

vi  /etc/sysconfig/flanneld  

FLANNEL_ETCD="http://192.168.234.130:2379"

FLANNEL_ETCD_KEY="/atomic.io/network"

node启动

for SERVICES in kube-proxy kubelet docker flanneld; do
        systemctl restart $SERVICES
        systemctl enable $SERVICES
        systemctl status $SERVICES
    done;

查看所有NODE是否正常

kubectl -s 192.168.234.130:8080 get no

kubectl get nodes

访问http://kube-apiserver:port

http://192.168.234.130:8080/        查看所有请求url

http://192.168.234.130:8080/healthz/ping      查看健康状况

wget  https://rawgit.com/kubernetes/dashboard/master/src/deploy/kubernetes-dashboard.yaml

kubectl create -f kubernetes-dashboard.yaml

kubectl delete -f kubernetes-dashboard.yaml

kubectl create -f kubernetes-dashboard.yaml

kubectl get namespace

      本文转自crazy_charles 51CTO博客，原文链接：http://blog.51cto.com/douya/1945382，如需转载请自行联系原作者