注： 本文原载于 My Personal Blog：， CodeSheep · 程序羊 ！
环境介绍
玩集群嘛，当然要搞几台机器做节点！无赖自己并没有性能很强劲的多余机器，在家里翻箱倒柜，找出了几台破旧的本子，试试看吧，与其垫桌脚不如拿出来遛遛弯...
总体环境安排如下图所示：
集群总体架构布局
各部分简介如下：
Master节点 ( 一台08年买的Hedy笔记本 Centos7.3 64bit )
HEDY
docker
etcd
flannel
kube-apiserver
kube-scheduler
kube-controller-manager
Slave节点 ( 一台二手Thinkpad T420s Centos7.3 64bit )
Thinkpad T420s
docker
flannel
kubelet
kube-proxy
Client节点（ 一台12年的Sony Vaio SVS13 Win7 Ultimate）
客户端嘛，毕竟甲方，不需要安装啥东西，有个ssh客户端能连到master和slave节点就OK
Docker镜像仓库
一般企业内部应用的话，其会搭建自己的docker registry，用作镜像仓库，我这里就直接用Docker Gub作为镜像仓库，自己不搭建了（其实主要是没机子啊！）
Wireless Router （雷猴子家的小米路由器3）
最好能穿墙，因为我家路由器放在客厅，但我实验是在卧室里做的啊！
各部分全部都是由wifi进行互联，我个人不太喜欢一大堆线绕来绕去
环境准备
先设置master节点和所有slave节点的主机名
master上执行：
hostnamectl --static set-hostname k8s-master
slave上执行：
hostnamectl --static set-hostname k8s-node-1
修改master和slave上的hosts
在master和slave的/etc/hosts文件中均加入以下内容：
192.168.31.166 k8s-master192.168.31.166 etcd192.168.31.166 registry192.168.31.199 k8s-node-1
关闭master和slave上的防火墙
systemctl disable firewalld.servicesystemctl stop firewalld.service
部署Master节点
master节点需要安装以下组件：
etcd
flannel
docker
kubernets
下面按顺序阐述
1. etcd安装
安装命令：
yum install etcd -y编辑etcd的默认配置文件
/etc/etcd/etcd.conf
# [member]ETCD_NAME=master ETCD_DATA_DIR="/var/lib/etcd/default.etcd"#ETCD_WAL_DIR=""#ETCD_SNAPSHOT_COUNT="10000"#ETCD_HEARTBEAT_INTERVAL="100"#ETCD_ELECTION_TIMEOUT="1000"#ETCD_LISTEN_PEER_URLS="http://localhost: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_CORS=""##[cluster]#ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380"# if you use different ETCD_NAME (e.g. test), set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."#ETCD_INITIAL_CLUSTER="default=http://localhost:2380"#ETCD_INITIAL_CLUSTER_STATE="new"#ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"ETCD_ADVERTISE_CLIENT_URLS="http://etcd:2379,http://etcd:4001"#ETCD_DISCOVERY=""#ETCD_DISCOVERY_SRV=""#ETCD_DISCOVERY_FALLBACK="proxy"#ETCD_DISCOVERY_PROXY=""#ETCD_STRICT_RECONFIG_CHECK="false"#ETCD_AUTO_COMPACTION_RETENTION="0"#ETCD_ENABLE_V2="true"##[proxy]#ETCD_PROXY="off"#ETCD_PROXY_FAILURE_WAIT="5000"#ETCD_PROXY_REFRESH_INTERVAL="30000"#ETCD_PROXY_DIAL_TIMEOUT="1000"#ETCD_PROXY_WRITE_TIMEOUT="5000"#ETCD_PROXY_READ_TIMEOUT="0"##[security]#ETCD_CERT_FILE=""#ETCD_KEY_FILE=""#ETCD_CLIENT_CERT_AUTH="false"#ETCD_TRUSTED_CA_FILE=""#ETCD_AUTO_TLS="false"#ETCD_PEER_CERT_FILE=""#ETCD_PEER_KEY_FILE=""#ETCD_PEER_CLIENT_CERT_AUTH="false"#ETCD_PEER_TRUSTED_CA_FILE=""#ETCD_PEER_AUTO_TLS="false"##[logging]#ETCD_DEBUG="false"# examples for -log-package-levels etcdserver=WARNING,security=DEBUG#ETCD_LOG_PACKAGE_LEVELS=""##[profiling]#ETCD_ENABLE_PPROF="false"#ETCD_METRICS="basic"##[auth]#ETCD_AUTH_TOKEN="simple"
启动etcd并验证
首先启动etcd服务
systemctl start etcd // 启动etcd服务
再获取etcd的健康指标看看：
etcdctl -C http://etcd:2379 cluster-healthetcdctl -C http://etcd:4001 cluster-health
查看etcd集群健康度
2. flannel安装
安装命令：
yum install flannel配置flannel：
/etc/sysconfig/flanneld
# Flanneld configuration options # etcd url location. Point this to the server where etcd runsFLANNEL_ETCD_ENDPOINTS="http://etcd:2379"# etcd config key. This is the configuration key that flannel queries# For address range assignmentFLANNEL_ETCD_PREFIX="/atomic.io/network"# Any additional options that you want to pass#FLANNEL_OPTIONS=""
配置etcd中关于flannel的key
etcdctl mk /atomic.io/network/config '{ "Network": "10.0.0.0/16" }'配置etcd中关于flannel的key
启动flannel并设置开机自启
systemctl start flanneld.servicesystemctl enable flanneld.service
3. docker安装
该部分网上教程太多了，主要步骤如下
安装命令：
yum install docker -y开启docker服务：
service docker start设置docker开启自启动：
chkconfig docker on
4. kubernets安装
k8s的安装命令很简单，执行：
yum install kubernetes
但k8s需要配置的东西比较多，正如第一节“环境介绍”中提及的，毕竟master上需要运行以下组件：
kube-apiserver
kube-scheduler
kube-controller-manager
下面详细阐述：
配置
/etc/kubernetes/apiserver文件
#### kubernetes system config## The following values are used to configure the kube-apiserver## The address on the local server to listen to.KUBE_API_ADDRESS="--address=0.0.0.0"# The port on the local server to listen on.KUBE_API_PORT="--port=8080"# Port minions listen onKUBELET_PORT="--kubelet-port=10250"# Comma separated list of nodes in the etcd clusterKUBE_ETCD_SERVERS="--etcd-servers=http://etcd:2379"# Address range to use for servicesKUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"# default admission control policies# KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"# Add your own!KUBE_API_ARGS=""
配置
/etc/kubernetes/config文件
#### kubernetes system config## The following values are used to configure various aspects of all# kubernetes services, including## kube-apiserver.service# kube-controller-manager.service# kube-scheduler.service# kubelet.service# kube-proxy.service# logging to stderr means we get it in the systemd journalKUBE_LOGTOSTDERR="--logtostderr=true"# journal message level, 0 is debugKUBE_LOG_LEVEL="--v=0"# Should this cluster be allowed to run privileged docker containersKUBE_ALLOW_PRIV="--allow-privileged=false"# How the controller-manager, scheduler, and proxy find the apiserverKUBE_MASTER="--master=http://k8s-master:8080"
启动k8s各个组件
systemctl start kube-apiserver.servicesystemctl start kube-controller-manager.servicesystemctl start kube-scheduler.service
设置k8s各组件开机启动
systemctl enable kube-apiserver.service systemctl enable kube-controller-manager.service systemctl enable kube-scheduler.service
部署Slave节点
slave节点需要安装以下组件：
flannel
docker
kubernetes
下面按顺序阐述：
1. flannel安装
安装命令：
yum install flannel配置flannel：
/etc/sysconfig/flanneld
# Flanneld configuration options # etcd url location. Point this to the server where etcd runsFLANNEL_ETCD_ENDPOINTS="http://etcd:2379"# etcd config key. This is the configuration key that flannel queries# For address range assignmentFLANNEL_ETCD_PREFIX="/atomic.io/network"# Any additional options that you want to pass#FLANNEL_OPTIONS=""
启动flannel并设置开机自启
systemctl start flanneld.servicesystemctl enable flanneld.service
2. docker安装
参考前文master节点上部署docker过程，此处不再赘述
3. kubernetes安装
安装命令：yum install kubernetes
不同于master节点，slave节点上需要运行kubernetes的如下组件：
kubelet
kubernets-proxy
下面详细阐述要配置的东西：
配置
/etc/kubernetes/config
#### kubernetes system config## The following values are used to configure various aspects of all# kubernetes services, including## kube-apiserver.service# kube-controller-manager.service# kube-scheduler.service# kubelet.service# kube-proxy.service# logging to stderr means we get it in the systemd journalKUBE_LOGTOSTDERR="--logtostderr=true"# journal message level, 0 is debugKUBE_LOG_LEVEL="--v=0"# Should this cluster be allowed to run privileged docker containersKUBE_ALLOW_PRIV="--allow-privileged=false"# How the controller-manager, scheduler, and proxy find the apiserverKUBE_MASTER="--master=http://k8s-master:8080"
配置
/etc/kubernetes/kubelet
#### kubernetes kubelet (minion) config# The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)KUBELET_ADDRESS="--address=0.0.0.0"# The port for the info server to serve on# KUBELET_PORT="--port=10250"# You may leave this blank to use the actual hostnameKUBELET_HOSTNAME="--hostname-override=k8s-node-1"# location of the api-serverKUBELET_API_SERVER="--api-servers=http://k8s-master:8080"# pod infrastructure containerKUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"# Add your own!KUBELET_ARGS=""
启动kube服务
systemctl start kubelet.servicesystemctl start kube-proxy.service
设置k8s组件开机自启
systemctl enable kubelet.service systemctl enable kube-proxy.service
至此为止，k8s集群的搭建过程就完成了，下面来验证一下集群是否搭建成功了
验证集群状态
查看端点信息：
kubectl get endpoints
端点信息
查看集群信息：
kubectl cluster-info
集群信息
获取集群中的节点状态：
kubectl get nodes
获取集群中的节点状态
OK，节点已经就绪，可以在上面做实验了！
后记
由于能力有限，若有错误或者不当之处，还请大家批评指正，一起学习交流！
作者：CodeSheep
链接：https://www.jianshu.com/p/7d1fb03b8925