在CentOS7上部署 Kubernetes集群
yum -y installetcd dockerflannel kubenetes一般会遇到没有k8s源的问题，先 yum update -y 看是否有效，如果还是没用就创建yum 源，再安装 kubenetes
如下操作：
创建yum源
vivirt7-docker-common-release.repo
加入以下内容：
name=virt7-docker-common-release
baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/
gpgcheck=0
安装服务
执行以下命令，安装kubernetes
yum -y install --enablerepo=virt7-docker-common-release kubernetes
接下来开始部署：
设置三台机器的主机名：
Master上执行：
#hostnamectl --static set-hostnamek8s-master
Node1上执行：
# hostnamectl --static set-hostnamek8s-node-1
Node2上执行：
# hostnamectl --static set-hostnamek8s-node-2
禁用防火墙（所有机器）
systemctl disablefirewalld.services
systemctl stopfirewalld.services
启动 etcd dockerflannel 服务： 1、先启动etcd:
systemctl enable etcd.service systemctl start etcd.service
2 配置Flannel
master、node上均编辑/etc/sysconfig/flanneld，修改红色部分
# vi /etc/sysconfig/flanneld
# Flanneld configuration options
# etcd url location.Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://etcd:2379"
# etcd config key.This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_PREFIX="/atomic.io/network"
# Any additional options that you want to pass
#FLANNEL_OPTIONS=""
3 配置etcd中关于flannel的key
Flannel使用Etcd进行配置，来保证多个Flannel实例之间的配置一致性，所以需要在etcd上进行如下配置：（‘/atomic.io/network/config’这个key与上文/etc/sysconfig/flannel中的配置项FLANNEL_ETCD_PREFIX是相对应的，错误的话启动就会出错）
# etcdctl mk /atomic.io/network/config '{ "Network": "10.0.0.0/16" }'
{ "Network": "10.0.0.0/16" }
4 启动
启动Flannel之后，需要依次重启docker
在master执行：
systemctl enable flanneld.service
systemctl start flanneld.service
service docker restart
在node上执行：
systemctl enable flanneld.service
systemctl start flanneld.service
service docker restart
在master节点配置etcd
yum安装的etcd默认配置文件在/etc/etcd/etcd.conf。编辑配置文件，更改以下带颜色部分信息：
# vi /etc/etcd/etcd.conf
#
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://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_CORS=""
#
#
#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=""
在master节点配置kubernetes服务
1.修改文件/etc/kubernetes/config(所有节点)
注意，master和slave主机都要修改
指定master主机的ip，文件内容如下：
$ cat /etc/kubernetes/config
KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="--master=http://master:8080"
1.修改配置文件/etc/etcd/etcd.conf,确保etcd监听所有地址。内容如下：
$ cat /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"
2.修改配置文件/etc/kubernetes/apiserver
cat /etc/kubernetes/apiserver
KUBE_API_ADDRESS="--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=""
3.修改配置文件/etc/kubernetes/controller-manager，定义slave主机ip地址
KUBELET_ADDRESSES="--machines=master地址"
在master主机上，启动服务
执行如下命令，批量启动服务
for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES
done
slave节点配置
注意：slave节点主机，同样要安装docker，flannel ,k8s
yum 安装kubernetes
yum -y install flannel docker
yum -y install --enablerepo=virt7-docker-common-release kubernetes
1.修改kubernetes配置文件，指定master。
$ cat /etc/kubernetes/config
KUBE_MASTER="--master=http://master:8080"
2.配置kubelet服务。
$ cat /etc/kubernetes/kubelet
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_PORT="--port=10250"
KUBELET_HOSTNAME="--hostname-override=node自身"
KUBELET_API_SERVER="--api-servers=http://master:8080"
在slave主机上，启动服务
for SERVICES in kube-proxy kubelet docker flanneld; do systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES
done
验证
现在登陆master，确认slave的状态
$ kubectl get nodes
NAME LABELS STATUS AGE
10.16.93.182 kubernetes.io/hostname=node1 Ready 1h
这样就配置完成了
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