Kubernetes部署服务

基本流程为：

1. 做image 并且push到private registry
2. 创建replication controller
3. 创建service
4. 搭建nginx代理
5. 测试 下面详述：

1. 制作image

java基础image:

1FROM dockerimages.yinnut.com:15043/centos:7
2MAINTAINER xuelun-infra morgan.wu@yinnnut.com
3 
4 
5ADD jdk-8u60-linux-x64.tar.gz /usr/local/
6ENV JAVA_HOME /usr/local/jdk1.8.0_60
7ENV PATH $JAVA_HOME/bin:$PATH

Friend-Service镜像:

1FROM dockerimages.yinnut.com:15043/yinnut-java:0.1
2MAINTAINER xuelun-infra morgan.wu@yinnnut.com
3 
4ADD FriendService.war /
5ADD jetty-runner.jar /
6WORKDIR /
7VOLUME ["/var/log"]

2. 创建Replication Controller

rc.yaml文件, 创建了2个friend的pod，设置replicas为2

1apiVersion: v1
2kind: ReplicationController
3metadata:
4  name: friend-service
5spec:
6  replicas: 2
7  template:
8    metadata:
9      labels:
10        yinnut-svc: "friend"
11        version: "0.1"
12    spec:
13      containers:
14      - name: friend-service
15        image: dockerimages.yinnut.com:15043/friend-service:0.1
16        ports:
17        - containerPort: 9999
18          protocol: TCP
19        command: ["java"]
20        args: ["-jar","jetty-runner.jar","--port","9999","--log","jetty.log","FriendService.war"]

##3. 创建Service## svc.yaml文件, 监听本地物理机的 127.0.0.1:30001端口

1apiVersion: v1
2kind: Service
3metadata:
4  name: friendsvc
5  labels:
6    yinnut-svc: friend
7spec:
8  type: NodePort
9  ports:
10  - port: 9999
11    protocol: TCP
12    targetPort: 9999
13    name: http
14    nodePort: 30001
15  selector:
16    yinnut-svc: friend

##4. 搭建Nginx反向代理## 安装：

1yum install -y http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
2yum install nginx -y

配置 /etc/nginx/conf.d/default.conf

1server {
2    listen       30000;
3    server_name  localhost;
4 
5    location / {
6         port_in_redirect on;
7         proxy_pass http://127.0.0.1:30001;
8         proxy_redirect  off;
9         proxy_set_header Host $host;
10         proxy_set_header X-Real-IP $remote_addr;
11         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
12    }
13}

设置worker数量为10，并且把30000端口添加到防火墙例外。 访问 http://192.168.1.221:30000端口即可。

##5. 测试## 可以看到有两个Friend的Pod

1[root@centos7-node-221 ~]$ kubectl get po
2NAME                   READY     STATUS                                                      RESTARTS   AGE
3busybox                1/1       Running                                                     296        12d
4friend-service-38riq   1/1       Running                                                     0          6h
5friend-service-nn0qt   1/1       Running                                                     0          11m

发送4个请求。其实我发送了上千个请求，怕这里写不下了。

1[root@centos7-node-221 ~]$ for i in {1..4}; do time curl http://192.168.1.221:30000/user/1/friend; done
2{"rc":0,"val":[{"friendUserId":2,"friendUserName":"who","close":false}]}
3real 0m0.029s
4user 0m0.004s
5sys  0m0.003s
6{"rc":0,"val":[{"friendUserId":2,"friendUserName":"who","close":false}]}
7real 0m0.039s
8user 0m0.001s
9sys  0m0.004s
10{"rc":0,"val":[{"friendUserId":2,"friendUserName":"who","close":false}]}
11real 0m0.028s
12user 0m0.002s
13sys  0m0.004s
14{"rc":0,"val":[{"friendUserId":2,"friendUserName":"who","close":false}]}
15real 0m0.035s
16user 0m0.003s
17sys  0m0.002s

2个Pod分别2个Response，多副本的RR负载均衡工作的很棒。

1# 第一个Pod
2172.16.91.0 - - [11/Oct/2015:12:33:51 +0000] "GET //192.168.1.221/user/1/friend HTTP/1.0" 200 72
3172.16.91.0 - - [11/Oct/2015:12:33:51 +0000] "GET //192.168.1.221/user/1/friend HTTP/1.0" 200 72
4 
5 
6# 和第二个Pod
7 
8172.16.91.1 - - [11/Oct/2015:12:33:51 +0000] "GET //192.168.1.221/user/1/friend HTTP/1.0" 200 72
9172.16.91.1 - - [11/Oct/2015:12:33:51 +0000] "GET //192.168.1.221/user/1/friend HTTP/1.0" 200 72

6. 总结##

Kubernetes棒棒哒!!! ;-) 负载均衡棒棒哒!