k8s安装

平台 :CentOS Linux release 7.5.1804 (Core)
master: 192.168.253.150
node1: 192.168.253.151
node2: 192.168.253.152

准备工作

配置ip

cd /etc/sysconfig/network-scripts

GATEWAY="192.168.253.2"
NETMASK="255.255.255.0"
IPADDR="192.168.253.150"
DNS1=223.5.5.5
DNS2=223.6.6.6

开通ssh

vi /etc/ssh/sshd_config
systemctl start sshd

关闭防火墙

systemctl stop firewalld
systemctl disable firewalld

关闭selinux

查看selinux状态：/usr/sbin/sestatus -v
vi /etc/sysconfig/selinux
SELINUX=enforcing

master安装部署

• 使用yum安装etcd和kubernetes-master
  yum install etcd kubernetes-master -y
• 编辑/etc/etcd/etcd.conf文件

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_NAME="default"
ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379"

• 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,ResourceQuota"
KUBE_API_ARGS=""

• 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 start $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES; done

• 在etcd中定义flannel网络

etcdctl mk /atomic.io/network/config '{"Network":"172.40.0.0/16"}'

node安装部署

node节点安装都一样

• 使用yum安装flannel和kubernetes-node
  yum install flannel kubernetes-node -y
• 为flannel网络指定etcd服务，修改/etc/sysconfig/flanneld文件

vi /etc/sysconfig/flanneld
FLANNEL_ETCD_ENDPOINTS="http://masterip:2379"
FLANNEL_ETCD_PREFIX="/atomic.io/network"

• 修改/etc/kubernetes/config文件

vi /etc/kubernetes/config
KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="--master=http://masterip:8080"

• 修改node节点配置文件/etc/kubernetes/kubelet

vi /etc/kubernetes/kubelet
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_PORT="--port=10250"
KUBELET_HOSTNAME="--hostname-override=nodeip"
KUBELET_API_SERVER="--api-servers=http://masterip:8080"
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
KUBELET_ARGS=""

• 配置完node后，在所有Node节点上启动flanneld，docker，kube-proxy,kubelet服务，并设置开机启动。这里强调一下，一定要注意etcd—->flannel—–>docker的先后启动顺序,否则会导致pod里边的ip会和其他node节点的pod不在一个网段，通信就有问题。

for SERVICES in flanneld docker kube-proxy kubelet;do systemctl start $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES; done
至此，node配置完毕。

三，验证集群状态
1，验证集群是否安装成功。 master执行如下命令：

kubectl get node
NAME STATUS AGE
192.168.253.51 Ready 3m
192.168.253.52 Ready 3m
2,查看网络情况

etcdctl ls -r | grep subnets
/atomic.io/network/subnets
/atomic.io/network/subnets/172.40.7.0-24
/atomic.io/network/subnets/172.40.3.0-24
[root@kube-master-01 ~]# etcdctl get /atomic.io/network/subnets/172.40.7.0-24
{"PublicIP":"192.168.253.51"}
[root@kube-master-01 ~]# etcdctl get /atomic.io/network/subnets/172.40.3.0-24
{"PublicIP":"192.168.253.52"}