Docker部署Zookeeper集群

Docker部署Zookeeper集群

官方网站:

http://zookeeper.apache.org/

http://zookeeper.apache.org/doc/r3.4.8/zookeeperAdmin.html

环境:

CentOS 7.1

docker-1.11.2

zookeeper-3.4.8

虚拟机部署请参看zookeeper集群

官方推荐奇数节点，这里以3节点为例

node1: 192.168.8.101

node2: 192.168.8.102

node3: 192.168.8.103

一.安装docker-engine(所有节点)

请参看CentOS6/7 docker安装

docker镜像加速请参看Docker Hub加速及私有镜像搭建

二.获取zookeeper docker镜像

docker pull jplock/zookeeper

docker tag jplock/zookeeper zookeeper

docker rmi -f jplock/zookeeper

三.配置并启动zookeeper集群节点

1.主配置文件zoo.cfg(所有节点)

mkdir /opt/zookeeper

docker run -tid --name=test zookeeper

docker cp test:/opt/zookeeper/conf /opt/zookeeper

docker rm -f test

cat >/opt/zookeeper/conf/zoo.cfg <<HERE

tickTime=2000

dataDir=/opt/zookeeper/data

clientPort=2181

initLimit=5

syncLimit=2

server.1=192.168.8.101:2888:3888

server.2=192.168.8.102:2888:3888

server.3=192.168.8.103:2888:3888

HERE

2.启动集群节点

docker run -tid --restart=always

    -p 2181:2181

    -p 2888:2888

    -p 3888:3888

    --net=host

    --oom-kill-disable=true

    --memory-swappiness=1

    -v /opt/zookeeper/data:/opt/zookeeper/data

    -v /opt/zookeeper/logs:/opt/zookeeper/logs

    -v /opt/zookeeper/conf:/opt/zookeeper/conf

    --name=zookeeper1

    zookeeper

提示:网络需要host模式，节点容器名不同即可。但此时zookeeper会启动失败，必须要配置完myid后才能正常启动集群模式，如果不指定myid，只能以standalone模式运行

其它节点只需要修改容器--name即可

3.myid

node1节点

echo 1 >/opt/zookeeper/data/myid

docker restart $(docker ps -a|grep zookeeper|awk '{print $1}')

node2节点

echo 2 >/opt/zookeeper/data/myid

docker restart $(docker ps -a|grep zookeeper|awk '{print $1}')

node3节点

echo 3 >/opt/zookeeper/data/myid

docker restart $(docker ps -a|grep zookeeper|awk '{print $1}')

提示: 目前myid的取值范围为1-255,节点的myid在单个集群内必须唯一

四.测试zookeeper集群

[root@swarm-a2 ~]# echo stat|nc 192.168.8.101 2181

Zookeeper version: 3.4.8--1, built on 02/06/2016 03:18 GMT

Clients:

 /192.168.192.101:50515[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0

Received: 1

Sent: 0

Connections: 1

Outstanding: 0

Zxid: 0x600000035

Mode: follower

Node count: 44

[root@swarm-a2 ~]# echo stat|nc 192.168.8.102 2181

Zookeeper version: 3.4.8--1, built on 02/06/2016 03:18 GMT

Clients:

 /192.168.8.103:58178[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0

Received: 1

Sent: 0

Connections: 1

Outstanding: 0

Zxid: 0x100000000

Mode: leader

Node count: 4

Connection closed by foreign host.

[root@swarm-a2 ~]# telnet 192.168.8.103 2181

Trying 192.168.8.103...

Connected to 192.168.8.103.

Escape character is '^]'.

stat

Zookeeper version: 3.4.8--1, built on 02/06/2016 03:18 GMT

Clients:

 /192.168.8.103:33661[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0

Received: 1

Sent: 0

Connections: 1

Outstanding: 0

Zxid: 0x100000000

Mode: follower

Node count: 4

Connection closed by foreign host.

可以看到，此时192.168.8.102是leader,余下是follower