kubernetes 留言版DEMO

kubernates hello world
1 关闭防火墙

$systemctl disable firewalld
$systemctl stop firewalld

2 安装etcd 和 kubernates

$yum install -y etcd kubernates

3 修改配置

docker /etc/sysconfig/docker
OPTIONS=‘--registry-mirror=http://06ec3c30.m.daocloud.io --selinux-enabled=false --insecure-registry gcr.io‘
kubernetes apiserver /etc/kubernates/apiserver
--admission-control 参数中的ServiceAccount 删除

4 顺序启动

$systemctl start etcd
$systemctl start docker
$systemctl start kube-apiserver
$systemctl start kube-controller-manager
$systemctl start kube-scheduler
$systemctl start kubelet
$systemctl start kube-proxy

单机版k8s 搭建完成

Hello word 留言板系统
依赖三个镜像：
docker.io/kubeguide/guestbook-php-frontend WEB前端
docker.io/kubeguide/redis-master 写留言
docker.io/kubeguide/guestbook-redis-slave 读取留言

1 创建master pod 和服务
编写 redis-master-controller.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: redis-master
  labels:
    name: redis-master
spec:
  replicas: 2
  selector:
    name: redis-master
  template:
    metadata:
      labels:
        name: redis-master
    spec:
      containers:
      - name: master
        image: kubeguide/redis-master
        ports:
        - containerPort: 6379

发布到k8s集群

$kubectl create -f redis-master-controller.yaml

查看

$kubectl get rc
CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS AGE
redis-master master kubeguide/redis-master name=redis-master 1 21d
$kubectl get po
NAME READY STATUS RESTARTS AGE
redis-master-69j7a 1/1 Running 7 20d

创建与之对应的service
编写 redis-master-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: redis-master
  labels:
    name: redis-master
spec:
  ports:
  - port: 6379
    targetPort: 6379
  selector:
    name: redis-master

$kubectl create -f redis-master-service.yaml
$kubectl get svc
NAME CLUSTER_IP EXTERNAL_IP PORT(S) SELECTOR AGE
redis-master 10.254.38.83 <none> 6379/TCP name=redis-master 20d

2 创建redis-salve Pod 和服务

编写 redis-slave-controller.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: redis-slave
  labels:
    name: redis-slave
spec:
  replicas: 2
  selector:
    name: redis-slave
  template:
    metadata:
      labels:
        name: redis-slave
    spec:
      containers:
      - name: slave
        image: kubeguide/guestbook-redis-slave
        env:
        - name: GET_HOSTS_FROM
          value: env
        ports:
        - containerPort: 6379

发布到k8s集群

$kubectl create -f redis-master-controller.yaml
$kubectl get rc
$kubectl get pod

创建 与之对应的service

编写 redis-slave-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: redis-slave
  labels:
    name: redis-slave
spec:
  ports:
  - port: 6379
  selector:
    name: redis-slave

$kubectl create -f redis-slave-service.yaml

$kubectl get svc

3 创建frontend Pod 和服务

编写 frontend-controller.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: frontend
  labels:
    name: frontend
spec:
  replicas: 3
  selector:
    name: frontend
  template:
    metadata:
      labels:
        name: frontend
    spec:
      containers:
      - name: frontend
        image: kubeguide/guestbook-php-frontend
        env:
        - name: GET_HOSTS_FROM
          value: env
        ports:
        - containerPort: 80

发布到k8s集群

$kubectl create -f frontend-controller.yaml
$kubectl get rc
$kubectl get pod

创建与之对应的service

编写 frontend-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: frontend
  labels:
    name: fronted
spec:
  type: NodePort
  ports:
  - port: 80
    nodePort: 30001
  selector:
    name: frontend

创建服务

$kubectl create -f frontend-service.yaml

查看

$kuberctl get svc

4 通过浏览器访问
localhost:30001

备注 k8s需要容器 gcr.io/google_containers/pause