史上最便捷搭建Zookeeper服务器的方法

├── docker-compose.yml

version: '3.4'
services:  zoo1:    image: zookeeper    restart: always    hostname: zoo1    ports:      - 2181:2181    environment:      ZOO_MY_ID: 1      ZOO_SERVERS: server.1=0.0.0.0:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
  zoo2:    image: zookeeper    restart: always    hostname: zoo2    ports:      - 2182:2181    environment:      ZOO_MY_ID: 2      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=0.0.0.0:2888:3888;2181 server.3=zoo3:2888:3888;2181
  zoo3:    image: zookeeper    restart: always    hostname: zoo3    ports:      - 2183:2181    environment:      ZOO_MY_ID: 3      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=0.0.0.0:2888:3888;2181

# The number of milliseconds of each tick# tickTime：CS通信心跳数# Zookeeper 服务器之间或客户端与服务器之间维持心跳的时间间隔，也就是每个 tickTime 时间就会发送一个心跳。tickTime以毫秒为单位。tickTime=2000
# The number of ticks that the initial# synchronization phase can take# initLimit：LF初始通信时限# 集群中的follower服务器(F)与leader服务器(L)之间初始连接时能容忍的最多心跳数（tickTime的数量）。initLimit=5
# The number of ticks that can pass between# sending a request and getting an acknowledgement# syncLimit：LF同步通信时限# 集群中的follower服务器与leader服务器之间请求和应答之间能容忍的最多心跳数（tickTime的数量）。syncLimit=2
# the directory where the snapshot is stored.# do not use /tmp for storage, /tmp here is just# example sakes.# dataDir：数据文件目录# Zookeeper保存数据的目录，默认情况下，Zookeeper将写数据的日志文件也保存在这个目录里。dataDir=/data/soft/zookeeper-3.4.12/data
# dataLogDir：日志文件目录# Zookeeper保存日志文件的目录。dataLogDir=/data/soft/zookeeper-3.4.12/logs
# the port at which the clients will connect# clientPort：客户端连接端口# 客户端连接 Zookeeper 服务器的端口，Zookeeper 会监听这个端口，接受客户端的访问请求。clientPort=2181# the maximum number of client connections.# increase this if you need to handle more clients#maxClientCnxns=60## Be sure to read the maintenance section of the# administrator guide before turning on autopurge.## http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance## The number of snapshots to retain in dataDir#autopurge.snapRetainCount=3# Purge task interval in hours# Set to "0" to disable auto purge feature#autopurge.purgeInterval=1

# 服务器名称与地址：集群信息（服务器编号，服务器地址，LF通信端口，选举端口）# 这个配置项的书写格式比较特殊，规则如下：# server.N=YYY:A:B# 其中N表示服务器编号，YYY表示服务器的IP地址，A为LF通信端口，表示该服务器与集群中的leader交换的信息的端口。B为选举端口，表示选举新leader时服务器间相互通信的端口（当leader挂掉时，其余服务器会相互通信，选择出新的leader）。一般来说，集群中每个服务器的A端口都是一样，每个服务器的B端口也是一样。但是当所采用的为伪集群时，IP地址都一样，只能时A端口和B端口不一样。

Welcome to ZooKeeper!2020-06-01 15:03:52,512 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1025] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)JLine support is enabled2020-06-01 15:03:52,576 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@879] - Socket connection established to localhost/127.0.0.1:2181, initiating session2020-06-01 15:03:52,599 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1299] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x100001140080000, negotiated timeout = 30000WATCHER::
WatchedEvent state:SyncConnected type:None path:null[zk: 127.0.0.1:2181(CONNECTED) 0]

[zk: 127.0.0.1:2181(CONNECTED) 10] ls /[zookeeper]

[zk: 127.0.0.1:2181(CONNECTED) 11] create /zk myDataCreated /zk[zk: 127.0.0.1:2181(CONNECTED) 12] ls /[zk, zookeeper][zk: 127.0.0.1:2181(CONNECTED) 13]

[zk: 127.0.0.1:2181(CONNECTED) 13] get /zkmyDatacZxid = 0x400000008ctime = Mon Jun 01 15:07:50 CST 2020mZxid = 0x400000008mtime = Mon Jun 01 15:07:50 CST 2020pZxid = 0x400000008cversion = 0dataVersion = 0aclVersion = 0ephemeralOwner = 0x0dataLength = 6numChildren = 0

[zk: 127.0.0.1:2181(CONNECTED) 14] delete /zk[zk: 127.0.0.1:2181(CONNECTED) 15] ls /[zookeeper]