Zookeeper集群搭建

Zookeeper搭建前提条件：
jdk、SSH互信，如何安装JDK请看《JDK安装》，如何建立服务器互信请看《SSH免密登录配置》

一、准备

这里我们以三台zookeeper来搭建，准备：

1.1 服务器准备：

10.242.167.216  app212
10.242.167.217  app211
10.242.167.218  app210

1.2 zookeeper安装包准备

这次使用的zookeeper版本是zookeeper-3.4.10.tar.gz,可以去zookeeper官网下载地址选择对应版本下载。然后ftp到服务器10.242.167.216（其中任意一台服务器） 的/opt目录下，然后把zookeeper-3.4.10修改为zookeeper

tar -xivf zookeeper-3.4.10.tar.gz -C /opt
mv zookeeper-3.4.10 zookeeper

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二、Zookeeper配置

进入zookeeper配置文件目录，然后改变zookeeper配置文件名字，进行配置。

cd /opt/zookeeper/conf/
cp zoo_sample.cfg zoo.cfg
创建目录：
mkdir -p /bak/zk/zk_data
vim zoo.cfg
修改配置：
dataDir=/bak/zk/zk_data
添加配置：
server.1=dbmspreapp212:2888:3888
server.2=dbmspreapp211:2888:3888
server.3=dbmspreapp210:2888:3888
创建空文件用来存储zookeeperId:
touch /bak/zk/zk_data/myid
写入id进myid文件：
echo 1 > /bak/zk/zk_data/myid
拷贝配置好后的zookeeper到其他两个节点：
scp -r /opt/zookeeper app211:/opt
scp -r /opt/zookeeper app210:/opt
在app211和app210上创建目录和文件：
mkdir -p /bak/zk/zk_data
touch /bak/zk/zk_data/myid
修改myid文件
echo 2 > /bak/zk/zk_data/myid
echo 3 > /bak/zk/zk_data/myid
保证zookeeper id不同即可

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三、启动zookeeper集群

分别启动三个zookeeper节点，

cd /opt/zookeeper/bin
./zkServer.sh start
./zkServer.sh status

注：三节点，一个leader,两个follower
如果显示两个follower和一个leader说明三节点的zookeeper集群搭建成功
./zkCli.sh 进入zookeeper客户端查看

到此，zookeeper搭建基本完成！

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四、附录

zoo.cfg配置参考

# 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=/bak/zk/zk_data
# the port at which the clients will connect
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

server.1=dbmspreapp212:2888:3888
server.2=dbmspreapp211:2888:3888
server.3=dbmspreapp210:2888:3888