docker-compose搭建zookeeper集群环境

编辑docker-compose.yaml文件

version: '2'
networks:
  byfn:

services:
  zookeeper1:
    image: zookeeper
    container_name: zookeeper1
    environment:
        - ZOO_MY_ID=1
        - ZOO_SERVERS=server.1=zookeeper1:2888:3888 server.2=zookeeper2:2888:3888 server.3=zookeeper3:2888:3888
    ports:
      - 2181
    networks:
      - byfn

  zookeeper2:
    image: zookeeper
    container_name: zookeeper2
    environment:
        - ZOO_MY_ID=2
        - ZOO_SERVERS=server.1=zookeeper1:2888:3888 server.2=zookeeper2:2888:3888 server.3=zookeeper3:2888:3888
    ports:
      - 2181
    networks:
      - byfn

  zookeeper3:
    image: zookeeper
    container_name: zookeeper3
    environment:
        - ZOO_MY_ID=3
        - ZOO_SERVERS=server.1=zookeeper1:2888:3888 server.2=zookeeper2:2888:3888 server.3=zookeeper3:2888:3888
    ports:
      - 2181
    networks:
      - byfn

详细的配置请参考文档：https://hub.docker.com/_/zookeeper/
这里非常清楚的描述了如何修改配置，存储数据，以及调整日志级别以及输出等设置。

启动服务

$ docker-compose up

验证集群的状态

$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED STATUS PORTS NAMES c1f7646bf0e6 zookeeper "/docker-entrypoin..." 23 minutes ago Up 23 minutes 2888/tcp, 3888/tcp, 0.0.0.0:32794->2181/tcp zookeeper2 7e05f06c258d zookeeper "/docker-entrypoin..." 23 minutes ago Up 23 minutes 2888/tcp, 3888/tcp, 0.0.0.0:32793->2181/tcp zookeeper3 d293438c1813 zookeeper "/docker-entrypoin..." 23 minutes ago Up 23 minutes 2888/tcp, 3888/tcp, 0.0.0.0:32792->2181/tcp zookeeper1 $ docker exec -t zookeeper1 zkServer.sh status ZooKeeper JMX enabled by default Using config: /conf/zoo.cfg Mode: follower $ docker exec -t zookeeper2 zkServer.sh status ZooKeeper JMX enabled by default Using config: /conf/zoo.cfg Mode: follower $ docker exec -t zookeeper3 zkServer.sh status ZooKeeper JMX enabled by default Using config: /conf/zoo.cfg Mode: leader

这里我们看到三个zookeeper节点，zookeeper3是leader，zookeeper1和zookeeper2是follower。

其他状态检查命令：

$ nc localhost 32794 <<< ruok
imok

$ echo srvr | nc localhost 32794 Zookeeper version: 3.4.13-2d71af4dbe22557fda74f9a9b4309b15a7487f03, built on 06/29/2018 04:05 GMT Latency min/avg/max: 0/7/116 Received: 40 Sent: 39 Connections: 1 Outstanding: 0 Zxid: 0x10000000e Mode: follower Node count: 5

集群的使用

4.1 基本操作

[zk: localhost:2181(CONNECTED) 4] create /foo "Hello foo" Created /foo [zk: localhost:2181(CONNECTED) 5] get /foo Hello foo cZxid = 0x100000013 ctime = Fri Jan 04 02:29:47 GMT 2019 mZxid = 0x100000013 mtime = Fri Jan 04 02:29:47 GMT 2019 pZxid = 0x100000013 cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 9 numChildren = 0 [zk: localhost:2181(CONNECTED) 6] ls /foo []

4.2 创建路径create

[zk: localhost:2181(CONNECTED) 7] create /foo1/foo1 "Hello foo1" Node does not exist: /foo1/foo1

创建失败，因为zookeeper不支持递归创建，必须先一级一级的创建父目录节点。
创建父目录时，让值为空就可以。(其实目录也可以带值，两者并不冲突。)

[zk: localhost:2181(CONNECTED) 14] create /foo1 "" # 或者：create /foo1 "" Created /foo1 [zk: localhost:2181(CONNECTED) 15] create /foo1/foo1 "Hello foo1" Created /foo1/foo1

4.3 查看节点的元素ls

[zk: localhost:2181(CONNECTED) 21] ls /foo1 [foo1]

因为/foo1是一个目录，他下面有一个子节点/foo1/foo1

[zk: localhost:2181(CONNECTED) 21] ls /foo1/foo1 []

因为/foo1/foo1是一个元节点，他下面没有子节点了。

注意，ls命令只能列出一级目录，不能递归列出所有的子目录。

4.4 获取值get

get /foo1/foo1

4.5 修改值set

set /foo1/foo1 'newvalue'

4.6 删除节点delete

delete /foo1/foo1

注意只能删除子节点为空的节点；所以如果要删除一个节点，必须先把所有的子节点都删除。
如果要删除非空目录，还可以使用rmr命令。

作者：CodingCode
链接：https://www.jianshu.com/p/8d31ede99206
来源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

docker-compose搭建zookeeper集群环境 CodingCode

docker-compose搭建zookeeper集群环境

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