ZooKeeper单服务器配置伪集群

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1、创建 /usr/local/services/zookeeper 文件夹：

    mkdir -p /usr/local/services/zookeeper

2、进入到 /usr/local/services/zookeeper 目录中：

    cd /usr/local/services/zookeeper

3、下载 zookeeper-3.4.14.tar.gz：

    wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.4.14/zookeeper-3.4.14.tar.gz

4、解压缩 zookeeper-3.4.14.tar.gz：

    tar -zxvf zookeeper-3.4.14.tar.gz

5、添加环境变量：

    vim /etc/profile

    添加如下内容:

    export ZOOKEEPER_HOME=/usr/local/zookeeper/zookeeper-3.4.14
    export PATH=.:$PATH:$ZOOKEEPER_HOME/bin

   配置文件生效：

   source /etc/profile

6、修改ZooKeeper配置文件：

  a.因为这里是在单服务器上面搭建zookeeper伪集群，所以需要分别在zookeeper路径（/usr/local/zookeeper）新建三个目录：        server1 、server2 、server2。用于存储每个zookeeper节点的配置文件和数据

  [[email protected] local]# cd /usr/local/zookeeper/

  [[email protected]lhost zookeeper]# mkdir server1 server2 server3

  目录结构：

  b.然后在每个server目录里面分别新建目录：data、dataLog

  [[email protected] zookeeper]# cd /usr/local/zookeeper/server1/

  [[email protected] server1]# mkdir data dataLog

 

  [[email protected] zookeeper]# cd /usr/local/zookeeper/server2/

  [[email protected] server2]# mkdir data dataLog

 

  [[email protected] zookeeper]# cd /usr/local/zookeeper/server3/

  [[email protected] server3]# mkdir data dataLog

 

c.在每个节点的data目录里面分别写节点序号

[[email protected] zookeeper]# echo '1' > /usr/local/zookeeper/server1/data/myid

[[email protected] zookeeper]# echo '2' > /usr/local/zookeeper/server2/data/myid

[[email protected] zookeeper]# echo '3' > /usr/local/zookeeper/server3/data/myid

 

d.每个节点分别编辑配置文件zoo.cfg

[[email protected] server1]# vim /usr/local/zookeeper/server1/zoo.cfg

其内容如下：

#server1
tickTime=2000
initLimit=5
syncLimit=2
dataDir=/usr/local/zookeeper/server1/data
dataLogDir=/usr/local/zookeeper/server1/dataLog
clientPort=2100
server.1=localhost:2200:2300
server.2=localhost:2201:2301
server.3=localhost:2202:2302

[[email protected] server2]# vim /usr/local/zookeeper/server2/zoo.cfg

其内容如下：

#server2
tickTime=2000
initLimit=5
syncLimit=2
dataDir=/usr/local/zookeeper/server2/data
dataLogDir=/usr/local/zookeeper/server2/dataLog
clientPort=2101
server.1=localhost:2200:2300
server.2=localhost:2201:2301
server.3=localhost:2202:2302

[[email protected] server3]# vim /usr/local/zookeeper/server3/zoo.cfg

其内容如下：

#server3
tickTime=2000
initLimit=5
syncLimit=2
dataDir=/usr/local/zookeeper/server3/data
dataLogDir=/usr/local/zookeeper/server3/dataLog
clientPort=2102
server.1=localhost:2200:2300
server.2=localhost:2201:2301
server.3=localhost:2202:2302

 

注意事项：

每个节点的dataDir和dataLogDir都需要配置成不一样，不然会提示此zookeeper节点已启动

每个节点的 clientPort 也需要配置成不一样，这是客户端连接端口，每个zookeeper节点不能冲突

端口2200和端口2300分别为各个节点的连接端口和选举端口，如果是在单个服务器上面搭建伪集群，则需要配置成不同的端口，不然启动时会爆端口已被占用的错误

 

7、启动：

[[email protected] zookeeper]# cd /usr/local/zookeeper/zookeeper-3.4.14/bin

分别启动三个节点：

[[email protected] bin]# ./zkServer.sh start /usr/local/zookeeper/server1/zoo.cfg

[[email protected] bin]# ./zkServer.sh start /usr/local/zookeeper/server2/zoo.cfg

[[email protected] bin]# ./zkServer.sh start /usr/local/zookeeper/server3/zoo.cfg

如果出现这种情况：

a.检查zoo.cfg，myid 文件是否有问题

b.检查端口冲突

c.关闭防火墙试试

d.切换root权限再试试

 

8、检查集群状态：

[[email protected] bin]# ./zkServer.sh status /usr/local/zookeeper/server1/zoo.cfg

ZooKeeper JMX enabled by default

Using config: /usr/local/zookeeper/server1/zoo.cfg

Mode: follower

 

[[email protected] bin]# ./zkServer.sh status /usr/local/zookeeper/server2/zoo.cfg

ZooKeeper JMX enabled by default

Using config: /usr/local/zookeeper/server2/zoo.cfg

Mode: follower

 

[[email protected] bin]# ./zkServer.sh status /usr/local/zookeeper/server3/zoo.cfg

ZooKeeper JMX enabled by default

Using config: /usr/local/zookeeper/server3/zoo.cfg

Mode: leader

最后，配置成功。