# Docker下ZooKeeper的使用
Docker下ZooKeeper的使用
# 1. 单机
不多说，命令 docker pull zookeeper:latest 下载镜像先
PS C:\> docker pull zookeeper:latest latest: Pulling from library/zookeeper
000eee12ec04: Pull complete
2f1dc2bdcfe1: Pull complete
c2a806caa98c: Pull complete
89a5b0238e61: Pull complete
c466c1675a7f: Pull complete
4241cb045c41: Pull complete
00705bdbb29e: Pull complete
46650ba881a5: Pull complete
Digest: sha256:859cd2d39b1502210ed9640d3c2bd698ea699a28ce1c5de4f3e5c82a826d1afc
Status: Downloaded newer image for zookeeper:latest
docker.io/library/zookeeper:latest
PS C:\>
下载完成启动 docker run --name zk -p 2181:2181 zookeeper
PS C:\> docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
zookeeper latest 611ffeaf5959 2 weeks ago 224MB
tomcat 8.5.43-jdk8-adoptopenjdk-openj9 689bdcef64fe 4 months ago 339MB
elasticsearch 7.3.0 bdaab402b220 5 months ago 806MB
elasticsearch 7.2.1 1e8add8d7b66 5 months ago 862MB
apache/dubbo-admin latest af2357c7df7e 7 months ago 489MB
mobz/elasticsearch-head 5 b19a5c98e43b 2 years ago 824MB
PS C:\> docker run --name zk -p 2181:2181 zookeeper
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
2019-12-23 08:26:51,337 [myid:] - INFO [main:QuorumPeerConfig@133] - Reading configuration from: /conf/zoo.cfg
...
# 启动日志忽略
这样就启动成功了
# 2. 集群
因为一个一个地启动 Zookeeper 太麻烦了，所以为了方便起见，直接使用 Docker Compose 来启动 Zookeeper 集群。首先创建一个名为 docker-compose.yml 的文件，其内容如下
version: '2.2'
services:
zk1:
# Dockerfile使用build(.表示当前目录)，image使用现成的镜像
# build: .
image: zookeeper
# 跟随一起启动
# restart: always
container_name: zk1
ports:
- "2181:2181"
environment:
ZOO_MY_ID: 1
ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181
zk2:
image: zookeeper
# 跟随一起启动
# restart: always
container_name: zk2
ports:
- "2182:2181"
environment:
ZOO_MY_ID: 2
ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181
zk3:
image: zookeeper
# 跟随一起启动
# restart: always
container_name: zk3
ports:
- "2183:2181"
environment:
ZOO_MY_ID: 3
ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181
这个配置文件会告诉 Docker 分别运行三个 Zookeeper 镜像，并分别将本地的 2181，2182，2183 端口绑定到对应的容器的 2181 端口上
ZOO_MY_ID 和 ZOO_SERVERS 是搭建 Zookeeper 集群需要设置的两个环境变量，其中 ZOO_MY_ID 表示 ZK 服务的 Id，它是 1-255 之间的整数，必须在集群中唯一，ZOO_SERVERS 是 Zookeeper 集群的主机列表
# 2.1. 启动
然后我们使用 Docker Compose 命令执行这个文件，切换到这个文件所在目录执行 docker-compose config 检测语法是否错误
PS D:\> docker-compose config
services:
zk1:
container_name: zk1
environment:
ZOO_MY_ID: 1
ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181
image: zookeeper
ports:
- 2181:2181/tcp
restart: always
zk2:
container_name: zk2
environment:
ZOO_MY_ID: 2
ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181
image: zookeeper
ports:
- 2182:2181/tcp
restart: always
zk3:
container_name: zk3
environment:
ZOO_MY_ID: 3
ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181
image: zookeeper
ports:
- 2183:2181/tcp
restart: always
version: '2.2'
PS D:\>
执行 docker-compose up 启动，docker-compose up -d 加 -d 表示后台执行，docker-compose logs 查看执行日志，docker-compose stop 停止
PS D:\> docker-compose up -d
Creating zk2 ... done
Creating zk1 ... done
Creating zk3 ... done
PS D:\>
这样就启动了
# 2.2. 查看
打开 zkCli.cmd，输入命令 config
[zk: localhost:2181(CONNECTED) 1] config
server.1=zk1:2888:3888:participant;0.0.0.0:2181
server.2=zk2:2888:3888:participant;0.0.0.0:2181
server.3=zk3:2888:3888:participant;0.0.0.0:2181
version=0
我们还可以进入容器，查看下
PS D:\> docker exec -it zk1 bash
root@702f0d18b95b:/apache-zookeeper-3.5.6-bin# ls
LICENSE.txt NOTICE.txt README.md README_packaging.txt bin conf docs lib
root@702f0d18b95b:/apache-zookeeper-3.5.6-bin# cd bin
root@702f0d18b95b:/apache-zookeeper-3.5.6-bin/bin# ls
README.txt zkCli.cmd zkEnv.cmd zkServer-initialize.sh zkServer.sh zkTxnLogToolkit.sh
zkCleanup.sh zkCli.sh zkEnv.sh zkServer.cmd zkTxnLogToolkit.cmd
root@702f0d18b95b:/apache-zookeeper-3.5.6-bin/bin# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: follower
root@702f0d18b95b:/apache-zookeeper-3.5.6-bin/bin# exit
exit
PS D:\> docker exec -it zk2 bash
root@8b08e0797f8a:/apache-zookeeper-3.5.6-bin# ls
LICENSE.txt NOTICE.txt README.md README_packaging.txt bin conf docs lib
root@8b08e0797f8a:/apache-zookeeper-3.5.6-bin# cd bin
root@8b08e0797f8a:/apache-zookeeper-3.5.6-bin/bin# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: follower
root@8b08e0797f8a:/apache-zookeeper-3.5.6-bin/bin# exit
exit
PS D:\>
PS D:\> docker exec -it zk3 bash
root@d88339ffcca2:/apache-zookeeper-3.5.6-bin# ls
LICENSE.txt NOTICE.txt README.md README_packaging.txt bin conf docs lib
root@d88339ffcca2:/apache-zookeeper-3.5.6-bin# cd bin
root@d88339ffcca2:/apache-zookeeper-3.5.6-bin/bin# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: leader
root@d88339ffcca2:/apache-zookeeper-3.5.6-bin/bin# exit
exit
PS D:\>
可以看到两个 follower，一个 leader，最后停止
PS D:\> docker-compose stop
Stopping zk3 ... done
Stopping zk2 ... done
Stopping zk1 ... done
PS D:\>
参考