Zookeeper集羣環境配置

Zookeeper集羣環境依賴jdk1.6以上版本，Zookeeper集羣節點至少三個，因爲內部機制有宕機的節點剩餘節點必須過半才能正常運行。Zookeeper每個節點的都是平等的，通過內部選舉算法選舉一個leader其它均爲follower。

集羣環境：

centos6.5   master  192.168.145.129
centos6.5   slave1  192.168.145.130
centos6.5   slave2  192.168.145.136

配置步驟:

1.配置三臺主機的hostname：（以192.168.145.129爲例 其它的修改對應的hostname即可，重啓系統後生效）

    vim /etc/sysconfig/network
    NETWORKING=yes
    HOSTNAME=master  #修改成對應主機的hostname
    NETWORKING_IPV6=yes
    IPV6_AUTOCONF=no

2.配置三臺主機的hosts文件內容如下：（集羣節點hosts是一致的）

    127.0.0.1 localhost.localdomain localhost
    ::1 localhost6.localdomain6 localhost6
    192.168.145.129 master
    192.168.145.130 slave1
    192.168.145.136 slave2

3.設置環境變量

export HADOOP_HOME=/usr/local/hadoop-2.7.2
export JAVA_HOME=/home/work/jdk1.7.0
export ZOOKEEPER_HOME=/usr/local/zookeeper-3.4.6
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$HADOOP_HOME/bin:$ZOOKEEPER_HOME/bin:$PATH

4.配置Zookeeper配置文件conf/zoo.cfg

dataDir=/usr/local/zookeeper-3.4.6/data
# set logs
dataLogDir=/usr/local/zookeeper-3.4.6/logs
# set server
server.1=master:4887:5887
server.2=slave1:4887:5887
server.3=slave2:4887:5887

5.在$ZOOKEEPER_HOME/data目錄下創建myid文件

[root@master data]# pwd
/usr/local/zookeeper-3.4.6/data

[root@master data]# ll
total 12
-rw-r--r--. 1 root root    2 Apr 17 00:57 myid
drwxr-xr-x. 2 root root 4096 Apr 18 11:39 version-2
-rw-r--r--. 1 root root    4 Apr 17 19:46 zookeeper_server.pid
[root@master data]#

6.將文件複製到其它節點

scp /usr/local/zookeeper-3.4.6 root@slave1:/usr/local
scp /usr/local/zookeeper-3.4.6 root@slave2:/usr/local

7.修改$ZOOKEEPER_HOME/data目錄下的myid文件

master節點：myid文件內容是1
slave1節點：myid文件內容是2
slave2節點：myid文件內容是3

8.啓動Zookeeper

bin/zkService.sh start   啓動zookeeper
[root@master zookeeper-3.4.6]# bin/zkServer.sh start
JMX enabled by default
Using config: /usr/local/zookeeper-3.4.6/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

相同方法分別啓動slave1，slave2節點上的zookeeper

bin/zkService.sh status  查看狀態
[root@master zookeeper-3.4.6]# bin/zkServer.sh status
JMX enabled by default
Using config: /usr/local/zookeeper-3.4.6/bin/../conf/zoo.cfg
Mode: follower