Kubernetes是Google开源的容器集群管理系统，其提供应用部署、维护、 扩展机制等功能，利用Kubernetes能方便地管理跨机器运行容器化的应用，是Docker分布式系统的解决方案。k8s里所有的资源都可以用yaml或Json定义。
主机角色规划：
| 主机名 | 功能 | IP地址 |
| k8s-master | master/etcd | 10.200.3.102 |
| k8s-node-1 | etcd/node | 10.200.3.103 |
| k8s-node-2 | etcd/node | 10.200.3.104 |
一、准备工作:
1.关闭三台机器上的防火墙和关闭selinux：
#systemctl disable firewalld.service #systemctl stop firewalld.service 修改/etc/selinux/config SELINUX=disabled
2.设置三台机器的主机名
Master上执行： #hostnamectl --static set-hostname k8s-master Node1上执行： #hostnamectl --static set-hostname k8s-node-1 Node2上执行： #hostnamectl --static set-hostname k8s-node-2
3.三台主机都写入host文件
#echo '10.200.3.102 k8s-master 10.200.3.102 etcd 10.200.3.102 registry 10.200.3.103 k8s-node-1 10.200.3.104 k8s-node-2' >> /etc/hosts
4.软件包安装，三台主机都执行安装如下软件包
# yum install -y etcd docker kubernetes
二、部署etcd集群.
etcd集群在kubernetes中的作用就是一个中心数据库，etcd保存了整个集群的状态,用于保存一些配置，并且具有高可用的特性。
1.master etcd配置
a. 修改配置文件/etc/etcd/etcd.conf
[root@k8s-master ~]# vim /etc/etcd/etcd.conf #[Member] #ETCD_CORS="" ETCD_DATA_DIR="/var/lib/etcd/master.etcd" #ETCD_WAL_DIR="" ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380" ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379,http://0.0.0.0:4001" #ETCD_MAX_SNAPSHOTS="5" #ETCD_MAX_WALS="5" ETCD_NAME="k8s-master" #ETCD_SNAPSHOT_COUNT="100000" #ETCD_HEARTBEAT_INTERVAL="100" #ETCD_ELECTION_TIMEOUT="1000" #ETCD_QUOTA_BACKEND_BYTES="0" #ETCD_MAX_REQUEST_BYTES="1572864" #ETCD_GRPC_KEEPALIVE_MIN_TIME="5s" #ETCD_GRPC_KEEPALIVE_INTERVAL="2h0m0s" #ETCD_GRPC_KEEPALIVE_TIMEOUT="20s" # #[Clustering] #ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380" #ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379" #ETCD_DISCOVERY="" #ETCD_DISCOVERY_FALLBACK="proxy" #ETCD_DISCOVERY_PROXY="" #ETCD_DISCOVERY_SRV="" #ETCD_INITIAL_CLUSTER="default=http://localhost:2380" ETCD_INITIAL_CLUSTER="k8s-master=http://10.200.3.102:2380,k8s-node-1=http://10.200.3.103:2380,k8s-node-2=http://10.200.3.104:2380" ETCD_ADVERTISE_CLIENT_URLS="http://10.200.3.102:2379,http://10.200.3.102:4001" #ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" #ETCD_INITIAL_CLUSTER_STATE="new" #ETCD_STRICT_RECONFIG_CHECK="true" #ETCD_ENABLE_V2="true" #
2.node etcd配置 (两配置只有ETCD_DATA_DIR和ETCD_ADVERTISE_CLIENT_URLS不一样，别的一致)
1.>10.200.3.103主机配置信息
[root@k8s-node-1 ~]# cat /etc/etcd/etcd.conf #[Member] #ETCD_CORS="" ETCD_DATA_DIR="/var/lib/etcd/k8s-node-1.etcd" #ETCD_WAL_DIR="" ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380" ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379,http://0.0.0.0:4001" #ETCD_MAX_SNAPSHOTS="5" #ETCD_MAX_WALS="5" ETCD_NAME="k8s-node-1" #ETCD_SNAPSHOT_COUNT="100000" #ETCD_HEARTBEAT_INTERVAL="100" #ETCD_ELECTION_TIMEOUT="1000" #ETCD_QUOTA_BACKEND_BYTES="0" #ETCD_MAX_REQUEST_BYTES="1572864" #ETCD_GRPC_KEEPALIVE_MIN_TIME="5s" #ETCD_GRPC_KEEPALIVE_INTERVAL="2h0m0s" #ETCD_GRPC_KEEPALIVE_TIMEOUT="20s" # #[Clustering] #ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380" ETCD_ADVERTISE_CLIENT_URLS="http://10.200.3.103:2379,http://10.200.3.103:4001" #ETCD_DISCOVERY="" #ETCD_DISCOVERY_FALLBACK="proxy" #ETCD_DISCOVERY_PROXY="" #ETCD_DISCOVERY_SRV="" #ETCD_INITIAL_CLUSTER="default=http://localhost:2380" ETCD_INITIAL_CLUSTER="k8s-master=http://10.200.3.102:2380,k8s-node-1=http://10.200.3.103:2380,k8s-node-2=http://10.200.3.104:2380" #ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" #ETCD_INITIAL_CLUSTER_STATE="new" #ETCD_STRICT_RECONFIG_CHECK="true" #ETCD_ENABLE_V2="true" #
2.>10.200.3.104主机配置信息
[root@k8s-node-2 ~]# cat /etc/etcd/etcd.conf #[Member] #ETCD_CORS="" ETCD_DATA_DIR="/var/lib/etcd/k8s-node-1.etcd" #ETCD_WAL_DIR="" ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380" ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379,http://0.0.0.0:4001" #ETCD_MAX_SNAPSHOTS="5" #ETCD_MAX_WALS="5" ETCD_NAME="k8s-node-2" #ETCD_SNAPSHOT_COUNT="100000" #ETCD_HEARTBEAT_INTERVAL="100" #ETCD_ELECTION_TIMEOUT="1000" #ETCD_QUOTA_BACKEND_BYTES="0" #ETCD_MAX_REQUEST_BYTES="1572864" #ETCD_GRPC_KEEPALIVE_MIN_TIME="5s" #ETCD_GRPC_KEEPALIVE_INTERVAL="2h0m0s" #ETCD_GRPC_KEEPALIVE_TIMEOUT="20s" # #[Clustering] #ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380" ETCD_ADVERTISE_CLIENT_URLS="http://10.200.3.104:2379,http://10.200.3.104:4001" #ETCD_DISCOVERY="" #ETCD_DISCOVERY_FALLBACK="proxy" #ETCD_DISCOVERY_PROXY="" #ETCD_DISCOVERY_SRV="" #ETCD_INITIAL_CLUSTER="default=http://localhost:2380" ETCD_INITIAL_CLUSTER="k8s-master=http://10.200.3.102:2380,k8s-node-1=http://10.200.3.103:2380,k8s-node-2=http://10.200.3.104:2380" #ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" #ETCD_INITIAL_CLUSTER_STATE="new" #ETCD_STRICT_RECONFIG_CHECK="true" #ETCD_ENABLE_V2="true" #
3.>启动etcd
启动etcd并设置开机自动启动
#systemctl enable etcd
#systemctl start etcd.service