1 使用docker-compose方式

1. 拉取 Zookeeper 镜像：docker pull zookeeper:版本号

2. 创建并编写vi docker-compose.yaml

   version: '3.3'
   services:
   zoo1:
    image: zookeeper:3.4.13
    restart: always
    hostname: zoo1
    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:3.4.13
    restart: always
    hostname: zoo2
    container_name: zoo2
    ports:
      - "2182:2181" # 将docker容器中的2181端口映射到宿主机的2182端口
    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:3.4.13
    restart: always
    hostname: zoo3
    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

3. 在 docker-compose.yaml 所在目录创建并启动容器，然后查看集群中一个容器的zookeeper状态

   docker-compose -p zk_cluster up -d                                     # 创建并启动容器
   docker exec -it zoo1 bash ./bin/zkServer.sh status  # 查看zoo1容器中zookeeper的状态

   2 纯手工方式

   2.1 准备好3个节点的配置文件

   zoo.cfg默认在/usr/local/etc/zookeeper目录下。在这个目录下创建zoo1.cfg zoo2.cfg zoo3.cfg。其中，各个节点需要配置相应的dataDir，clientPort。
   另外，server.1, server.2, server.3是集群配置信息，表明构成集群的3个节点。例如：server.A=B:D:D. 这里的A是一个数字，表示服务器的编号。B是这个服务器的ip地址。C是zookeeper服务器之间通信端口。D是Leader选举的端口。

4. zoo1.cfg 配置文件 ```shell zookeeper $ cat zoo1.cfg

   The number of milliseconds of each tick

   tickTime=2000

   The number of ticks that the initial

   synchronization phase can take

   initLimit=10

   The number of ticks that can pass between

   sending a request and getting an acknowledgement

   syncLimit=5

   the directory where the snapshot is stored.

   do not use /tmp for storage, /tmp here is just

   example sakes.

   dataDir=/usr/local/var/run/zookeeper/zk1/data

   the port at which the clients will connect

   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

server.1=localhost:2287:3387 server.2=localhost:2288:3388 server.3=localhost:2289:3389

2. zoo2.cfg 配置文件
```shell
zookeeper $ cat zoo2.cfg 
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
dataDir=/usr/local/var/run/zookeeper/zk2/data
# the port at which the clients will connect
clientPort=2182
# 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
server.1=localhost:2287:3387
server.2=localhost:2288:3388
server.3=localhost:2289:3389

1. zoo3.cfg 配置文件 ```shell zookeeper $ cat zoo3.cfg

   The number of milliseconds of each tick

   tickTime=2000

   The number of ticks that the initial

   synchronization phase can take

   initLimit=10

   The number of ticks that can pass between

   sending a request and getting an acknowledgement

   syncLimit=5

   the directory where the snapshot is stored.

   do not use /tmp for storage, /tmp here is just

   example sakes.

   dataDir=/usr/local/var/run/zookeeper/zk3/data

   the port at which the clients will connect

   clientPort=2183

   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

server.1=localhost:2287:3387 server.2=localhost:2288:3388 server.3=localhost:2289:3389

4. 创建data目录和myid文件
```shell
#创建如下data目录
/usr/local/var/run/zookeeper/zk1/data
/usr/local/var/run/zookeeper/zk2/data
/usr/local/var/run/zookeeper/zk3/data
#创建如下myid文件
data $ cat /usr/local/var/run/zookeeper/zk1/data/myid
1
data $ cat /usr/local/var/run/zookeeper/zk2/data/myid
2
data $ cat /usr/local/var/run/zookeeper/zk3/data/myid
3

1. 启动3个zookeeper ```shell $ zkServer start /usr/local/etc/zookeeper/zoo1.cfg ZooKeeper JMX enabled by default Using config: /usr/local/etc/zookeeper/zoo1.cfg Starting zookeeper … STARTED

$ zkServer start /usr/local/etc/zookeeper/zoo2.cfg ZooKeeper JMX enabled by default Using config: /usr/local/etc/zookeeper/zoo2.cfg Starting zookeeper … STARTED

$ zkServer start /usr/local/etc/zookeeper/zoo3.cfg ZooKeeper JMX enabled by default Using config: /usr/local/etc/zookeeper/zoo3.cfg Starting zookeeper … STARTED

6. 查看各个节点的状态：1个leader，2个follower
```shell
$ zkServer status /usr/local/etc/zookeeper/zoo1.cfg 
ZooKeeper JMX enabled by default
Using config: /usr/local/etc/zookeeper/zoo1.cfg
Mode: follower
zkServer status /usr/local/etc/zookeeper/zoo2.cfg 
ZooKeeper JMX enabled by default
Using config: /usr/local/etc/zookeeper/zoo2.cfg
Mode: follower
$ zkServer status /usr/local/etc/zookeeper/zoo3.cfg 
ZooKeeper JMX enabled by default
Using config: /usr/local/etc/zookeeper/zoo3.cfg
Mode: leader

1. 进入zookeeper集群内部，登陆各个节点 ```shell $ zkCli -server localhost:2181 Connecting to localhost:2181 Welcome to ZooKeeper! JLine support is enabled

WATCHER::

WatchedEvent state:SyncConnected type:None path:null

$ zkCli -server localhost:2182 $ zkCli -server localhost:2183

在zk1上新建一个node，到zk2和3上能够马上查看到

[zk: localhost:2181(CONNECTED) 1] create /test-zk1 “test-zk1” Created /test-zk1

[zk: localhost:2182(CONNECTED) 1] get /test-zk1 test-zk1 cZxid = 0x100000007 ctime = Sat Mar 13 22:05:00 CST 2021 mZxid = 0x100000007 mtime = Sat Mar 13 22:05:00 CST 2021 pZxid = 0x100000007 cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 8 numChildren = 0

[zk: localhost:2183(CONNECTED) 0] get /test-zk1 test-zk1 cZxid = 0x100000007 ctime = Sat Mar 13 22:05:00 CST 2021 mZxid = 0x100000007 mtime = Sat Mar 13 22:05:00 CST 2021 pZxid = 0x100000007 cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 8 numChildren = 0 ```