Zookeeper 分布式环境搭建

一、前期环境

安装概览

IP	Host Name	Software
192.168.23.128	ae01	JDK 1.7
192.168.23.129	ae02	JDK 1.7
192.168.23.130	ae03	JDK 1.7

若使用虚拟机安装，可以安装samba, smbfs方便对于文件的控制。

系统环境： ubuntu-12.04.2-server-amd64
安装目录： /usr/local/ae
JDK 安装目录： export JAVA_HOME=/usr/local/ae/jdk1.7.0_51
Zookeeper版本： zookeeper-3.4.5

二、Zookeeper 安装

修改host文件，添加3台服务器的hostname，以ae01 为例。

user@ae01:/usr/local/ae$ sudo vim /etc/hosts

127.0.0.1         localhost
192.168.23.128    ae01
192.168.23.129    ae02
192.168.23.129    ae03

解压zookeeper-3.4.5.tar.gz 到/usr/local/ae 目录

user@ae01:/usr/local/ae$ sudo tar -zxvf zookeeper-3.4.5.tar.gz

复制$ZOOKEEPER_HOME/conf/zoo_sample.cfg 为zoo.cfg 并修改

user@ae01:/usr/local/ae/zookeeper-3.4.5/conf$ sudo vm zoo_sample.cfg zoo.cfg

修改zoo.cfg

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=5
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=2
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
dataDir=/usr/local/ae/storage/zookeeper
# the port at which the clients will connect
clientPort=2181
#
# 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=ae01:2888:3888
server.2=ae02:2888:3888
server.3=ae03:2888:3888

dataDir 为Zookeeper保存数据的文件夹
server.1=ae01:2888:3888 '2888'为连接所使用的端口号，'3888'为选举leader使用的端口号

复制zookeeper-3.4.5 到ae02，ae03

user@ae01:/usr/local/ae$ scp -r zookeeper-3.3.5/ user@ae01:/usr/local/ae
user@ae01:/usr/local/ae$ scp -r zookeeper-3.3.5/ user@ae02:/usr/local/ae

设置myid

user@ae01:/usr/local/ae$ echo "1" > /usr/local/ae/storage/zookeeper/myid
user@ae02:/usr/local/ae$ echo "2" > /usr/local/ae/storage/zookeeper/myid
user@ae03:/usr/local/ae$ echo "3" > /usr/local/ae/storage/zookeeper/myid

myid的值对应着上文中 server.x 的参数

三、启动Zookeeper 集群

启动Zookeeper
```
user@ae01:/usr/local/ae/zookeeper-3.4.5/bin$ sudo zkServer.sh start
user@ae02:/usr/local/ae/zookeeper-3.4.5/bin$ sudo zkServer.sh start
user@ae03:/usr/local/ae/zookeeper-3.4.5/bin$ sudo zkServer.sh start
```
由于ZooKeeper集群启动的时候，每个结点都试图去连接集群中的其它结点，先启动的肯定连不上后面还没启动的，日志前面部分出现连接异常（java.net.ConnectException: Connection refused ）是可以忽略的。集群在选出一个Leader后，最后稳定了。

验证启动

user@ae01:/usr/local/ae/zookeeper-3.4.5/bin$ zkServer.sh status
JMX enabled by default
Using config: /usr/local/ae/zookeeper-3.4.5/bin/../conf/zoo.cfg
Mode: leader

user@ae02:/usr/local/ae/zookeeper-3.4.5/bin$ zkServer.sh status
JMX enabled by default
Using config: /usr/local/ae/zookeeper-3.4.5/bin/../conf/zoo.cfg
Mode: follower

user@ae03:/usr/local/ae/zookeeper-3.4.5/bin$ zkServer.sh status
JMX enabled by default
Using config: /usr/local/ae/zookeeper-3.4.5/bin/../conf/zoo.cfg
Mode: follower

四、文档参考

http://zookeeper.apache.org/doc/trunk/zookeeperOver.html