CentOS7安装k8s集群

准备机器

准备机器，本次以虚拟机示范，系统都是CentOS7，以root用户的登录，实际应用中如果使用虚拟机，可以先创建一台，然后完成master和node都需要的配置之后，再克隆出多台。本次演示的机器ip分别为：

机器	IP
master	192.168.0.89
node1	192.168.0.90
node2	192.168.0.91
node3	192.168.0.92
node4	192.168.0.93

所有机器配置

1.关闭防火墙服务和selinx，避免与docker容器的防火墙规则冲突

systemctl stop firewalld
systemctl disable firewalld
setenforce 0

2.安装epel-release源

yum -y install epel-release

master机器配置

1.安装etcd和kubernetes-master

yum -y install etcd kubernetes-master

2.编辑etcd配置/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"

3.编辑kubernetes的apiserver配置/etc/kubernetes/apiserver

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

5.在etcd中定义flannel网络

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

所有node机器配置

1.安装flannel和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://192.168.0.89:2379"
FLANNEL_ETCD_KEY="/atomic.io/network"

• 其中192.168.0.89改为你真实master机器ip

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://192.168.0.89:8080"

• 其中192.168.0.89改为你真实master机器ip

4.修改node配置文件/etc/kubernetes/kubelet

KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_PORT="--port=10250"
KUBELET_HOSTNAME="--hostname-override=192.168.0.90"
KUBELET_API_SERVER="--api-servers=http://192.168.0.89:8080" #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=""

• 其中192.168.0.89改为你真实master机器ip
• 其中192.168.0.90改为当前node自己的ip

5.在所有Node节点上启动kube-proxy,kubelet,docker,flanneld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

验证集群是否成功

在master机器上执行kubectl get node，成功如下：

参考：k8s入门系列之集群安装篇，CENTOS部署K8S