Kubernetes集群安装部署

Kubernetes集群组件:

-Master节点

  - etcd 一个高可用的K/V键值对存储和服务发现系统

  - kube-apiserver 提供kubernetes集群的API调用

  - kube-controller-manager 确保集群服务

  - kube-scheduler 调度容器,分配到Node

-Minion节点

  - flannel 实现夸主机的容器网络的通信

  - kubelet 在Node节点上按照配置文件中定义的容器规格启动容器

  - kube-proxy 提供网络代理服务

集群示意图

  Kubernetes工作模式server-client,Kubenetes Master提供集中化管理Minions。

部署1台Kubernetes Master节点和3台Minion节点,

192.168.137.142 cmmaster

192.168.137.148 cmnode1

192.168.137.199 cmnode2

192.168.137.212 cmnode3

安装EPEL源,在所有节点上

# yum -y install epel-release

安装配置Kubernetes Master,在Master节点上

1.使用yum安装etcd和kubernetes-master

# yum -y install etcd kubernetes-master


2.编辑/etc/etcd/etcd.conf文件

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"


3.编辑/etc/kubernetes/apiserver文件

KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"

KUBE_API_PORT="--port=8080"

KUBELET_PORT="--kubelet-port=10250"

KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"

KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"

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

KUBE_API_ARGS=""


4.启动etcd、kube-apiserver、kube-controller-manager、kube-scheduler等服务,并设置开机启动。

启动etcd、kube-apiserver、kube-controller-manager、kube-scheduler等服务,并设置开机启动。

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


# systemctl status  etcd.service

# systemctl status  kube-apiserver.service

# systemctl status  kube-controller-manager.service

# systemctl status  kube-scheduler.service



5.在etcd中定义flannel网络

[root@cmmaster ~]# etcdctl mk /atomic.io/network/config '{"Network":"172.17.0.0/16"}'




安装配置Kubernetes Node

如下操作在cmnode1、cmnode2、cmnode3上执行

1.安装flannel kubernetes-node

yum -y install flannel kubernetes-node


2.为flannel网络指定etcd服务,修改/etc/sysconfig/flanneld文件

FLANNEL_ETCD="http://192.168.137.142:2379"

FLANNEL_ETCD_KEY="/atomic.io/network"


3.修改/etc/kubernetes/config文件

KUBE_LOGTOSTDERR="--logtostderr=true"

KUBE_LOG_LEVEL="--v=0"

KUBE_ALLOW_PRIV="--allow-privileged=false"

KUBE_MASTER="--master=http://192.168.137.142:8080"



4.按照如下内容修改对应node的配置文件/etc/kubernetes/kubelet

KUBELET_ADDRESS="--address=0.0.0.0"                                   #将127.0.0.1修改成0.0.0.0

KUBELET_PORT="--port=10250"

KUBELET_HOSTNAME="--hostname-override=192.168.137.148"             #修改成对应Node的IP

KUBELET_API_SERVER="--api-servers=http://192.168.137.142:8080"     #指定Master节点的API Server

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

KUBELET_ARGS=""


5.在所有Node节点上启动kube-proxy,kubelet,docker,flanneld等服务,并设置开机启动

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



•验证集群是否安装成功

在master上执行如下命令

[root@cmmaster ~]# kubectl get node

NAME              STATUS    AGE

192.168.137.147   Ready     7m

192.168.137.148   Ready     1m

192.168.137.199   Ready     7m

上述节点正常显示,状态为Ready,则说明集群搭建成功