kubernetes简单示例

1. 安装

yum install -y etcd kubernetes

2. 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

3. 拉镜像

docker pull daocloud.io/library/mysql

docker pull daocloud.io/library/tomcat

4. 创建YAML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: daocloud.io/library/mysql
             ports:
             - containerPort: 3306
             env:
             - name: MYSQL_ROOT_PASSWORD
               value: "123456"

mysql-svc.yaml

1 apiVersion: v1
2 kind: Service
3 metadata: 
4     name: mysql
5 spec: 
6     ports: 
7       - port: 3306
8     selector:
9       app: mysql

 myweb-rc.yaml

 apiVersion: v1

 1 apiVersion: v1
 2 kind: ReplicationController
 3 metadata: 
 4     name: myweb
 5 spec: 
 6     replicas: 3
 7     selector: 
 8         app: myweb
 9     template: 
10         metadata: 
11             labels: 
12                 app: myweb
13         spec: 
14             containers: 
15             - name: myweb
16               image: daocloud.io/library/tomcat
17               ports: 
18               - containerPort: 8080
19               env: 
20               - name: MYSQL_SERVICE_HOST
21                 value: "mysql"
22               - name: MYSQL_SERVICE_PORT
23                 value: "3306"

 myweb-svc.yaml

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

5.创建replicationController以及Service

kubectl create -f /XX/mysql-rc.yaml
kubectl create -f /XX/mysql-svc.yaml
kubectl create -f /XX/myweb-rc.yaml
kubectl create -f /XX/myweb-svc.yaml

6. 查看RC和Service运行状态

kubectl get pod mysql（应该是running状态）
kubectl get service mysql
kubectl get pod myweb（应该是running状态）
kubectl get service myweb

7. 查看kubectl的日志（如果有问题，则查看相应日志）

kubectl describe pod mysql(myweb)
kubectl describe service mysql(myweb)

8. 确认服务

http://ip:8080是否跳转到tomcat的欢迎页面，跳转则安装成功；

看到此处发现mysql其实并没有啥用，但是其实原始demo的tomcat是从hub.docker.com/u/kubeguide下面拉取，但是被墙了，于是就用daocloude的tomcat做替换。