zookeeper集群部署（分布式）-蒲公英云

zookeeper集群部署（分布式）

描述

ZooKeeper可以用来保证数据在zookeeper集群之间的数据的事务一致性。

如何搭建ZooKeeper集群

Zookeeper服务集群规模不小于三个节点，要求各服务之间系统时间要保持一致。
在hadoop0的usr/local目录下，解压缩zookeeper（执行命令tar –zvxf zookeeper.tar.gz）
设置环境变量

打开/etc/profile文件！内容如下：

#set java & hadoop
export JAVA_HOME=/usr/local/jdk
export HADOOP_HOME=/usr/local/hadoop
export ZOOKEEPER_HOME=/usr/local/zookeeper
export PATH=.:$HADOOP_HOME/bin:$ZOOKEEPER_HOME/bin:$JAVA_HOME/bin:$PATH

注：修改完后profile记得执行source /etc/profile

在解压后的zookeeper的目录下进入conf目录修改配置文件

更名操作：mv zoo_sample.cfg zoo.cfg

编辑zoo.cfg (vi zoo.cfg)

修改dataDir=/usr/local/zookeeper/data/

新增server.0=hadoop03888

     server.1=hadoop1:2888:3888
     server.2=hadoop2:2888:3888

文件如下：

# 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=/usr/local/zookeeper/data
# 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.0=hadoop0:2888:3888
server.1=hadoop1:2888:3888
server.2=hadoop2:2888:3888

注：

server.0=hadoop03888

server.1=hadoop13888

server.2=hadoop23888

这三行为配置zookeeper集群的机器（hadoop0、hadoop1、hadoop2）分别用server.0和server.1、server.2标识，2888和3888为端口号（zookeeper集群包含一个leader(领导)和多个fllower(随从)，启动zookeeper集群时会随机分配端口号，分配的端口号为2888的为leader，端口号为3888的是fllower）