centos7 k8s安裝步驟

前提：系統沒有安裝過docker，否則需要卸載掉。系統要能聯網

一。安裝

1.yum update  # 更新yum

2.關閉cetos自帶的防火牆

    systemctl disable firewalld

    systemctl stop firewalld
3.安裝etcd和kubernetes軟件

    yum install -y etcd kubernetes

4.啓動所有服務

  4.1 systemctl start etcd

   4.2 systemctl start docker

    如果失敗，請執行：cat /etc/sysconfig/docker  

   OPTIONS='--selinux-enabled=false --log-driver=journald --signature-verification=false --registry-mirror=https://fzhifedh.mirror.aliyuncs.com --insecure-registry=registry.sese.com'    #修改這裏的"--selinux-enabled" ，改成"--selinux-enabled=false"

4.3 systemctl start kube-apiserver

4.4 systemctl start kube-controller-manager

 4.5 systemctl start kube-scheduler

 4.6 systemctl start kubelet

 4.7 systemctl start kube-proxy

二。創建 rc的yaml文件

vi mysql-rc.yaml

具體內容：

apiVersion: v1
kind: ReplicationController       # RC
metadata:
 name: mysql
spec:
 replicas: 1
 selector:
  app: mysql
 template:
  metadata:
   labels:
    app: mysql
  spec:
   containers:
   - name: mysql
     image: mysql
     ports:
     - containerPort: 3306
     env:
     - name: MYSQL_PORT_PASSWORD
       value: "123456"

2.創建rc

進入yaml文件存放路徑，執行下列命令：

kubectl create -f mysql-rc.yaml

3.查看rc是否創建成功：

kubectl get pods

4.查看pods是否創建成功

kubectl get pods

如果提示not found source，則修改vim /etc/kubernetes/apiservice 文件

找到這一行 "KUBE_ADMISSION_CONTROL="--admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityConte

（刪除一個Service開頭的）

然後重啓 

systemctl restart etcd docker kube-apiserver kube-controller-manager kube-scheduler kubelet kube-proxy

嘗試重新創建 rc

kubectl delete -f mysql.yaml

kubectl create -f mysql.yaml

kubectl create -f mysql-rc.yaml
5.查看是否創建容器鏡像

docker ps |grep mysql

三。創建service

1.創建svc的yaml文件

vi mysql-svc.yaml

apiVersion: v1
kind: Service   # is service
metadata:
 name: mysql  # global id
spec:
 ports:
  - port: 3306
 selector:  # service port
  app: mysql  #pod label

2.創建service

kubectl create -f mysql-svc.yaml

3.查看service是否創建成功

kubectl get svc

NAME         CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
kubernetes   10.254.0.1       <none>        443/TCP    23h
mysql        10.254.248.100   <none>        3306/TCP   15s

創建成功