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Zookeeper相关配置

在上一小节中,我们已经把Zookeeper的安装包成功解压至/export/servers目录下。接下来,我们开始配置Zookeeper集群。

1.修改Zookeeper的配置文件

首先,进入Zookeeper解压目录下的conf目录,复制配置文件zoo_sample.cfg并重命名为zoo.cfg,具体命令如下:

$ cp zoo_sample.cfg zoo.cfg

其次,修改配置文件zoo.cfg,分别设置dataDir目录,配置服务器编号与主机名映射关系,设置与主机连接的心跳端口和选举端口,具体配置内容如下:

# The number of milliseconds of each tick

\# 设置通信心跳数

tickTime=2000

\# The number of ticks that the initial 

\# synchronization phase can take

\# 设置初始通信时限

initLimit=10

\# The number of ticks that can pass between 

\# sending a request and getting an acknowledgement

\# 设置同步通信时限

syncLimit=5

\# the directory where the snapshot is stored.

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

\# example sakes.

**#** **设置数据文件目录+****数据持久化路径**

**dataDir=/export/data/zookeeper/zkdata**

\# the port at which the clients will connect

\# 设置客户端连接的端口号

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

**#** **配置ZK集群的服务器编号以及对应的主机名、通信端口号(心跳端口号)、选举端口号**

**server.1=hadoop01:2888:3888**

**server.2=hadoop02:2888:3888**

**server.3=hadoop03:2888:3888**

2.创建myid文件

首先,根据配置文件zoo.cfg中设置的dataDir目录,创建zkdata文件夹,具体命令如下:

$ mkdir -p /export/data/zookeeper/zkdata

其次,在zkdata文件夹下创建myid文件,该文件里面的内容就是服务器编号(hadoop01服务器对应编号1,hadoop02服务器对应编号2,hadoop03服务器对应编号3),具体命令如下:

$ cd /export/data/zookeeper/zkdata

$ echo 1 > myid

3.配置环境变量

Linux系统目录/etc下的文件profile里面的内容都是与Linux环境变量相关的。所以,我们一般配置环境变量都是在profile文件里面。执行命令vi /etc/profile对profile文件进行修改,添加Zookeeper的环境变量,具体命令如下:

export ZK_HOME=/export/servers/zookeeper-3.4.10

export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin:$HADOOP_HOME/sbin:$ZK_HOME/bin

4.分发Zookeeper相关文件至其他服务器

首先,将Zookeeper安装目录分发至hadoop02、hadoop03服务器上。具体命令如下:

$ scp -r /export/servers/zookeeper-3.4.10/ hadoop02:/export/servers/

$ scp -r /export/servers/zookeeper-3.4.10/ hadoop03:/export/servers/

其次,将myid文件分发至hadoop02、hadoop03服务器上,并且修改myid的文件内容,依次对应服务器号进行设置,分别为2、3。具体命令如下:

$ scp -r /export/data/zookeeper/ hadoop02:/export/data/

$ scp -r /export/data/zookeeper/ hadoop03:/export/data/

最后,将profile文件也分发至hadoop02、hadoop03服务器上。具体命令如下:

$ scp /etc/profile hadoop02:/etc/profile

$ scp /etc/profile hadoop03:/etc/profile

5.环境变量生效

分别在hadoop01、hadoop02、hadoop03服务器上刷新profile配置文件,使环境变量生效。具体命令如下:

$ source /etc/profile
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