Kubernetes怎么部署ReplicationController多副本负载均衡

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1. 制作image

java基础image:

FROM dockerimages.yinnut.com:15043/centos:7MAINTAINER xuelun-infra morgan.wu@yinnnut.com  ADD jdk-8u60-linux-x64.tar.gz /usr/local/ENV JAVA_HOME /usr/local/jdk1.8.0_60ENV PATH $JAVA_HOME/bin:$PATH

Friend-Service镜像:

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

2. 创建Replication Controller

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

apiVersion: v1kind: ReplicationControllermetadata:  name: friend-servicespec:  replicas: 2  template:    metadata:      labels:        yinnut-svc: "friend"        version: "0.1"    spec:      containers:      - name: friend-service        image: dockerimages.yinnut.com:15043/friend-service:0.1        ports:        - containerPort: 9999          protocol: TCP        command: ["java"]        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

apiVersion: v1kind: Servicemetadata:  name: friendsvc  labels:    yinnut-svc: friendspec:  type: NodePort  ports:  - port: 9999    protocol: TCP    targetPort: 9999    name: http    nodePort: 30001  selector:    yinnut-svc: friend

##4. 搭建Nginx反向代理## 安装：

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

配置 /etc/nginx/conf.d/default.conf

server {    listen       30000;    server_name  localhost;     location / {         port_in_redirect on;         proxy_pass http://127.0.0.1:30001;         proxy_redirect  off;         proxy_set_header Host $host;         proxy_set_header X-Real-IP $remote_addr;         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;    }}

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

[root@centos7-node-221 ~]$ kubectl get poNAME                   READY     STATUS                                                      RESTARTS   AGEbusybox                1/1       Running                                                     296        12dfriend-service-38riq   1/1       Running                                                     0          6hfriend-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。

[root@centos7-node-221 ~]$ for i in {1..4}; do time curl http://192.168.1.221:30000/user/1/friend; done{"rc":0,"val":[{"friendUserId":2,"friendUserName":"who","close":false}]}real 0m0.029suser 0m0.004ssys  0m0.003s{"rc":0,"val":[{"friendUserId":2,"friendUserName":"who","close":false}]}real 0m0.039suser 0m0.001ssys  0m0.004s{"rc":0,"val":[{"friendUserId":2,"friendUserName":"who","close":false}]}real 0m0.028suser 0m0.002ssys  0m0.004s{"rc":0,"val":[{"friendUserId":2,"friendUserName":"who","close":false}]}real 0m0.035suser 0m0.003ssys  0m0.002s

2个Pod分别2个Response，多副本的RR负载均衡工作的很棒。

# 第一个Pod172.16.91.0 - - [11/Oct/2015:12:33:51 +0000] "GET //192.168.1.221/user/1/friend HTTP/1.0" 200 72172.16.91.0 - - [11/Oct/2015:12:33:51 +0000] "GET //192.168.1.221/user/1/friend HTTP/1.0" 200 72  # 和第二个Pod 172.16.91.1 - - [11/Oct/2015:12:33:51 +0000] "GET //192.168.1.221/user/1/friend HTTP/1.0" 200 72172.16.91.1 - - [11/Oct/2015:12:33:51 +0000] "GET //192.168.1.221/user/1/friend HTTP/1.0" 200 72

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