zookeeper 3.8.0 cluster docker-compose 部署

ppdouble

已于 2022-06-05 17:10:42 修改

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分类专栏： Java 文章标签： docker zookeeper kafka

于 2022-05-22 14:41:34 首次发布

本文链接：https://blog.youkuaiyun.com/ppdouble/article/details/124901231

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由于zookeeper 集群选择leader的策略是少数服从多数原则，所以建议选择奇数个结点

1 compose file 文件

version: '3.7'

services:
  zoo1:
    image: zookeeper:3.8.0
    restart: always
    hostname: zoo1
    container_name: zookeeper-cluster-1
    ports:
      - 12181:2181
      - 18080:8080
    volumes:
      - "/home/data/cluster/zookeeper/zookeeper-1/data:/data"
      - "/home/data/cluster/zookeeper/zookeeper-1/datalog:/datalog"
      - "/home/data/cluster/zookeeper/zookeeper-1/logs:/logs"
    environment:
      ZOO_MY_ID: 1
      ALLOW_ANONYMOUS_LOGIN: "yes"
      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
      ZOO_4LW_COMMANDS_WHITELIST: "*" 
    networks:
      brzk-kafka:
        ipv4_address: 172.19.0.11

  zoo2:
    image: zookeeper:3.8.0
    restart: always
    hostname: zoo2
    container_name: zookeeper-cluster-2
    ports:
      - 22181:2181
      - 28080:8080
    volumes:
      - "/home/data/cluster/zookeeper/zookeeper-2/data:/data"
      - "/home/data/cluster/zookeeper/zookeeper-2/datalog:/datalog"
      - "/home/data/cluster/zookeeper/zookeeper-2/logs:/logs"
    environment:
      ZOO_MY_ID: 2
      ALLOW_ANONYMOUS_LOGIN: "yes"
      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
      ZOO_4LW_COMMANDS_WHITELIST: "*"
    networks:
      brzk-kafka:
        ipv4_address: 172.19.0.12

  zoo3:
    image: zookeeper:3.8.0
    restart: always
    hostname: zoo3
    container_name: zookeeper-cluster-3
    ports:
      - 32181:2181
      - 38080:8080
    volumes:
      - "/home/data/cluster/zookeeper/zookeeper-3/data:/data"
      - "/home/data/cluster/zookeeper/zookeeper-3/datalog:/datalog"
      - "/home/data/cluster/zookeeper/zookeeper-3/logs:/logs"
    environment:
      ZOO_MY_ID: 3
      ALLOW_ANONYMOUS_LOGIN: "yes"
      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
      ZOO_4LW_COMMANDS_WHITELIST: "*"
    networks:
      brzk-kafka:
        ipv4_address: 172.19.0.13
networks:
  brzk-kafka:
        ipam:
            driver: default
            config:
                - subnet: "172.19.0.0/24"

2 运行

docker-compose --project-name myzkcomposeprj up -d

3 查看集群

在某个容器运行客户端:

docker exec --interactive --tty zookeeper-cluster-1 bin/zkCli.sh -server :2181 config| grep ^server

[hostuser@host-machine]$ docker exec --interactive --tty zookeeper-cluster-3 bin/zkCli.sh -server :2181 config | grep ^server
server.1=zoo1:2888:3888:participant;0.0.0.0:2181
server.2=zoo2:2888:3888:participant;0.0.0.0:2181
server.3=zoo3:2888:3888:participant;0.0.0.0:2181

查看结点类型：
docker exec zookeeper-cluster-2 bash -c 'echo srvr | nc localhost 2181' | grep "Mode"

[hostuser@host-machine]$ docker exec zookeeper-cluster-1 bash -c 'echo "srvr" | nc localhost 2181' | grep "Mode"
Mode: follower
[hostuser@host-machine]$ docker exec zookeeper-cluster-2 bash -c 'echo "srvr" | nc localhost 2181' | grep "Mode"
Mode: follower
[hostuser@host-machine]$ docker exec zookeeper-cluster-3 bash -c 'echo "srvr" | nc localhost 2181' | grep "Mode"
Mode: leader

也可以在 host 机器使用映射的端口查看:
echo "srvr" | nc localhost 32181

[hostuser@host-machine]$ echo "stat" | nc localhost 32181 
Zookeeper version: 3.8.0-5a02a05eddb59aee6ac762f7ea82e92a68eb9c0f, built on 2022-02-25 08:49 UTC
Clients:
 /172.19.0.1:36848[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 1/8.5/25
Received: 7
Sent: 6
Connections: 1
Outstanding: 0
Zxid: 0x10000000e
Mode: leader
Node count: 5
Proposal sizes last/min/max: 48/48/48

也可以使用容器里的 bin/zkServer.sh status 查看:

[hostuser@host-machine]$ docker exec zookeeper-cluster-3 bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: leader

如果环境变量设置了 ZOO_4LW_COMMANDS_WHITELIST: "*" 还可以用 docker exec zookeeper-cluster-2 bash -c 'echo "stat" | nc localhost 2181' | grep "Mode"

[hostuser@host-machine]$ docker exec zookeeper-cluster-2 bash -c 'echo "stat" | nc localhost 2181' | grep "Mode"
Mode: follower

新方法是使用 AdminServer 的 http 接口
http://localhost:8080/commands/stat

root@zoo2:/apache-zookeeper-3.8.0-bin# wget --quiet --output-document=/dev/stdout http://localhost:8080/commands/stat | grep "server_state"
    "server_state" : "follower",

或者在host 机器使用映射的端口

[hostuser@host-machine]$ curl --silent http://localhost:28080/commands/stat | grep "server_state"
    "server_state" : "follower",

4 客户端 zkCli.sh 进入集群

随便进入一个容器结点 docker exec --interactive --tty zookeeper-cluster-2 bash。再使用 zookeeper 客户端 zkCli.sh -server zoo3:2181 进入另外一个结点

root@zoo2:/apache-zookeeper-3.8.0-bin# zkCli.sh -server zoo3:2181
Connecting to zoo3:2181
...
Welcome to ZooKeeper!
JLine support is enabled
2022-05-21 16:38:14,563 [myid:zoo3:2181] - INFO  [main-SendThread(zoo3:2181):o.a.z.ClientCnxn$SendThread@1171] - Opening socket connection to server zoo3/172.19.0.13:2181.

...

[zk: zoo3:2181(CONNECTED) 0] create /test hello
Created /test

在这个结点上创建 znode 并关联字符串 hello

[zk: zoo3:2181(CONNECTED) 0] ls /
[test, zookeeper]
[zk: zoo3:2181(CONNECTED) 1] get /test
hello
[zk: zoo3:2181(CONNECTED) 2] quit

进入另外一个结点查看

root@zoo2:/apache-zookeeper-3.8.0-bin# zkCli.sh -server zoo1:2181
...
[zk: zoo1:2181(CONNECTED) 0] get /test
hello
[zk: zoo1:2181(CONNECTED) 1] ls /
[test, zookeeper]