Docker部署Zookeeper集群
官方网站:
环境:
CentOS 7.1
docker-1.11.2
zookeeper-3.4.8
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)
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