学习 ZooKeeper 建议最少三个节点，所以尝试用 Docker 搭建 ZooKeeper 集群
参考链接：这里
镜像下载
➜ ~ docker pull zookeeper
Using default tag: latest
latest: Pulling from library/zookeeper
ff3a5c916c92: Pull complete
a8906544047d: Pull complete
a790ae7377b0: Pull complete
2cbb132c648d: Pull complete
5cb2cad05481: Pull complete
d826b10121dc: Pull complete
f05685c79e04: Pull complete
Digest: sha256:96bd12586495a89da07d8bbd1fa48d127afe453adc428bb6a268ee2ec2ff7818
Status: Downloaded newer image for zookeeper:latest
创建模板文件
进入目录Documents/docker，此后所有操作都在该目录下
创建文件zookeeper-compose.yaml，内容如下：
version: '2'
services:
zoo1:
image: zookeeper
restart: always
container_name: zoo1
ports:
- "2181:2181"
environment:
ZOO_MY_ID: 1
ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888
zoo2:
image: zookeeper
restart: always
container_name: zoo2
ports:
- "2182:2181"
environment:
ZOO_MY_ID: 2
ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888
zoo3:
image: zookeeper
restart: always
container_name: zoo3
ports:
- "2183:2181"
environment:
ZOO_MY_ID: 3
ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888
启动镜像
➜ docker docker-compose -f zookeeper-compose.yaml up
Creating network "docker_default" with the default driver
Creating zoo2 ... done
Creating zoo1 ... done
Creating zoo3 ... done
Attaching to zoo2, zoo1, zoo3
……
后面很长的日志，不贴了
查看容器
新开一窗口，进入Documents/docker
➜ docker docker-compose -f zookeeper-compose.yaml ps
Name Command State Ports
------------------------------------------------------------------------------------------
zoo1 /docker-entrypoint.sh zkSe ... Up 0.0.0.0:2181->2181/tcp, 2888/tcp, 3888/tcp
zoo2 /docker-entrypoint.sh zkSe ... Up 0.0.0.0:2182->2181/tcp, 2888/tcp, 3888/tcp
zoo3 /docker-entrypoint.sh zkSe ... Up 0.0.0.0:2183->2181/tcp, 2888/tcp, 3888/tcp
查看集群
➜ docker echo stat | nc 127.0.0.1 2181
Zookeeper version: 3.4.12-e5259e437540f349646870ea94dc2658c4e44b3b, built on 03/27/2018 03:55 GMT
Clients:
/172.18.0.1:47398[0](queued=0,recved=1,sent=0)
Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x0
Mode: follower
Node count: 4
➜ docker echo stat | nc 127.0.0.1 2182
Zookeeper version: 3.4.12-e5259e437540f349646870ea94dc2658c4e44b3b, built on 03/27/2018 03:55 GMT
Clients:
/172.18.0.1:37092[0](queued=0,recved=1,sent=0)
Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x0
Mode: follower
Node count: 4
➜ docker echo stat | nc 127.0.0.1 2183
Zookeeper version: 3.4.12-e5259e437540f349646870ea94dc2658c4e44b3b, built on 03/27/2018 03:55 GMT
Clients:
/172.18.0.1:50862[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
关闭集群
➜ docker docker-compose -f zookeeper-compose.yaml stop
Stopping zoo3 ... done
Stopping zoo1 ... done
Stopping zoo2 ... done
总结
利用 Docker 搭建 ZooKeeper 集群非常简单，总体来说就是使用docker-compose命令