1 关防火墙
systemctl disable firewalld
systemctl stop firewalld

2. 关selinux
   vim /etc/selinux/config
   SELINUX=disabled
3. 安装etcd kubernetes(会自动安装docker)
   yum install -y etcd kubernetes
4. 安装好软件后，修改2个配置文件
   4.1 /etc/sysconfig/docker,其中options的内容配置为:
   OPTIONS='--selinux-enabled=false --insecure-registry gcr.io'
   4.2 /etc/kubernetes/apiserver,把admission-control中的ServiceAccount去掉
5. 按顺序启动所有的服务
   for i in etcd docker kube-apiserver kube-controoler-manager kube-scheduler kubelet kube-proxy;do systemctl start i;systemctl status $i;done
6. 执行以下步骤

1 wget http://mirror.centos.org/centos/7/os/x86_64/Packages/python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm
2 rpm2cpio python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm | cpio -iv --to-stdout ./etc/rhsm/ca/redhat-uep.pem | tee /etc/rhsm/ca/redhat-uep.pem
3 docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest
4 for i in flanneld kube-proxy kubelet docker;do systemctl restart $i;systemctl enable $i;systemctl status $i ;done

iptables -P FORWARD ACCEPT

到这里，单机版的kubernetes集群环境就安装启动完成了

现在开始练习在k8s里启动一个服务
创建一个目录k8straining,以下操作都在k8straining目录里

1. 先启动一个mysql,先创建一个rc定义文件:mysql-rc.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: mysql
spec:
  replicas: 1
  selector:
    app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - name: mysql
        image: mysql:5.7
        ports:
        - containerPort: 3306
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "123456"

执行kubectl create -f mysql-rc.yaml 创建rc
查看rc: kubectl get rc
查看pod: kubectl get pod
创建一个mysql的kubernetes service,先创建一个mysql-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  ports:
    - port: 3306
  selector:
    app: mysql

创建service: kubectl create -f mysql-svc.yaml
查看service: kubectl get svc

2. 启动tomcat应用,先创建myweb-rc.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: myweb
spec:
  replicas: 5
  selector:
    app: myweb
  template:
    metadata:
      labels:
        app: myweb
    spec:
      containers:
      - name: myweb
        image: kubeguide/tomcat-app:v1
        ports:
        - containerPort: 8080
        env:
        - name: MYSQL_ROOT_HOST
          value: "mysql"
        - name: MYSQL_ROOT_PORT
          value: '3306'

创建rc: kubectl create -f myweb-rc.yaml
应用service配置文件 myweb-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: myweb
spec:
  type: NodePort
  ports:
    - port: 8080
      nodePort: 30001
  selector:
    app: myweb

kubectl create -f myweb-svc.yaml
查看创建的service
kubectl get service

在本机浏览器看效果:

图片.png