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"
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