zookeeper 集群安装

[size=medium][b]前言：[/b][/size]
之前使用hbase时并没有单独安装zookeeper，直接用了它自带的zookeeper。因为现在要搞hadoop的HA,所以决定单独搞出一套。安装很简单，就简单带过了。

[size=medium][b]安装：[/b][/size]
[b]1. 准备安装包[/b]
我使用的是CDH4.3版本，到下面的下载地址找去吧：
[url]http://archive.cloudera.com/cdh4/cdh/4/[/url]
下载后解压到一个目录下，自己定吧。
我的：/app/cdh4/zookeeper-3.4.5-cdh4.3.0/

[b]2. 修改环境变量[/b]
将下面的信息加到/etc/profile
export ZOOKEEPER_HOME=/app/cdh4/zookeeper-3.4.5-cdh4.3.0
export PATH=$PATH:$ZOOKEEPER_HOME/bin

让配置生效：source /etc/profile

[b]3. 创建zookeeper数据存放目录[/b]
我的：/app/cdh4/hadoop/zookeeper

[b]4. 配置[/b]
编辑配置文件 ${ZOOKEEPER_HOME}/conf/zoo.cfg，conf目录下没有zoo.cfg，借个来。
cp zoo_sample.cfg zoo.cfg
然后编辑：

        # 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=/app/cdh4/hadoop/zookeeper
        # the port at which the clients will connect
        clientPort=42181
        server.2=server86:42888:43888
        server.0=server87:42888:43888
        server.1=server88:42888:43888

其中dataDir、clientPort修改信息，server.0、server.1、server.2为添加信息。

[b]5. 在数据存放目录下创建myid文件[/b]
分别在zookeeper节点的数据目录/app/cdh4/hadoop/zookeeper下创建文件，命名为“myid”, 编辑该“myid”文件，根据zoo.cfg配置输入编号。如在server87上，“myid”文件内容就是0，在server88上，内容就是1

[b]6. 启动服务[/b]
bin/zkServer.sh start 


[size=medium][b]测试：[/b][/size]
[b]1. 在一台机器上进行写操作：[/b]
＄bin/zkCli.sh -server server88:42181
[zk: server88:42181(CONNECTED) 0] create /test test
Node already exists: /mytest
[zk: server88:42181(CONNECTED) 1] ls /test
[]
[zk: server88:42181(CONNECTED) 2] get /test
test
cZxid = 0x100000002
ctime = Fri Aug 23 22:50:57 GMT+08:00 2013
mZxid = 0x100000002
mtime = Fri Aug 23 22:50:57 GMT+08:00 2013
pZxid = 0x100000002
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0

[b]2. 在一台机器上进行读操作：[/b]
＄bin/zkCli.sh -server server87:42181
[zk: server87:42181(CONNECTED) 1] ls /test
[]
[zk: server87:42181(CONNECTED) 2] get /test
test
cZxid = 0x100000002
ctime = Fri Aug 23 22:50:57 GMT+08:00 2013
mZxid = 0x100000002
mtime = Fri Aug 23 22:50:57 GMT+08:00 2013
pZxid = 0x100000002
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0

集群成功启动！阿门！
随笔原创，如有不当或错误之处，还望批评指正，感激涕零！！！
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