# Zookeeper安装（伪集群）
# 介绍
[TOC]
环境：CentOS7、zookeeper-3.4.14版本
主机配置:
| 主机名 | IP地址 | JDK |
|---|---|---|
| worker | 192.168.153.131 | 1.8.0_201 |
安装目录：/apps/zookeeper-3.4.14
备注：zookeeper依赖java，因此在安装zookeeper之前需要安装好java环境
1、 官网(https://zookeeper.apache.org/releases.html#download)下载Zookeeper。下载地址：http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.4.14/zookeeper-3.4.14.tar.gz (opens new window)
2、 将下载的Zookeeper文件上传到CentOS系统中。
3、 解压文件
tar -zxvf zookeeper-3.4.14.tar.gz
4、进入到conf目录
cd zookeeper-3.4.14/conf
5、将zoo_sample.cfg复制三份zoo.cfg 配置文件，依次命名为 zoo1.cfg zoo2.cfg zoo3.cfg
cp zoo_sample.cfg zoo1.cfg
cp zoo_sample.cfg zoo2.cfg
cp zoo_sample.cfg zoo3.cfg
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6、修改zoo1.cfg配置文件
# 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.
#数据存放目录
dataDir=/tmp/zookeeper/1
dataLogDir=/tmp/zookeeper/log/1
# the port at which the clients will connect
#服务的端口号
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=worker:28881:38881
server.2=worker:28882:38882
server.3=worker:28883:38883
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7、修改zoo2.cfg配置文件
# 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.
#数据存放目录
dataDir=/tmp/zookeeper/2
dataLogDir=/tmp/zookeeper/log/2
# the port at which the clients will connect
#服务的端口号
clientPort=2182
# 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=worker:28881:38881
server.2=worker:28882:38882
server.3=worker:28883:38883
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8、修改zoo3.cfg配置文件
# 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.
#数据存放目录
dataDir=/tmp/zookeeper/3
dataLogDir=/tmp/zookeeper/log/3
# the port at which the clients will connect
#服务的端口号
clientPort=2183
# 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=worker:28881:38881
server.2=worker:28882:38882
server.3=worker:28883:38883
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配置参数说明
tickTime:这个时间是作为zookeeper服务器之间或客户端与服务器之间维持心跳的时间间隔,也就是说每个tickTime时间就会发送一个心跳。
initLimit:这个配置项是用来配置zookeeper接受客户端（这里所说的客户端不是用户连接zookeeper服务器的客户端,而是zookeeper服务器集群中连接到leader的follower 服务器）初始化连接时最长能忍受多少个心跳时间间隔数。
当已经超过10个心跳的时间（也就是tickTime）长度后 zookeeper 服务器还没有收到客户端的返回信息,那么表明这个客户端连接失败。总的时间长度就是 10*2000=20秒。
syncLimit:这个配置项标识leader与follower之间发送消息,请求和应答时间长度,最长不能超过多少个tickTime的时间长度,总的时间长度就是5*2000=10秒。
dataDir:顾名思义就是zookeeper保存数据的目录,默认情况下zookeeper将写数据的日志文件也保存在这个目录里；
clientPort:这个端口就是客户端连接Zookeeper服务器的端口,Zookeeper会监听这个端口接受客户端的访问请求；
server.A=B:C:D:中的A是一个数字,表示这个是第几号服务器,B是这个服务器的IP地址，C第一个端口用来集群成员的信息交换,表示这个服务器与集群中的leader服务器交换信息的端口，D是在leader挂掉时专门用来进行选举leader所用的端口。
9、参考三份配置，分别建立数据目录和日志目录
mkdir -p /tmp/zookeeper/1
mkdir -p /tmp/zookeeper/log/1
mkdir -p /tmp/zookeeper/2
mkdir -p /tmp/zookeeper/log/2
mkdir -p /tmp/zookeeper/3
mkdir -p /tmp/zookeeper/log/3
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10、创建ServerID标识
除了修改zoo.cfg配置文件外,zookeeper集群模式下还要配置一个myid文件,这个文件需要放在dataDir目录下。
这个文件里面有一个数据就是A的值（该A就是zoo.cfg文件中server.A=B:C:D中的A）,在zoo.cfg文件中配置的dataDir路径中创建myid文件。值同时与zoo.cfg文件里面的server.1保持一致，如下
echo "1" > /tmp/zookeeper/1/myid
echo "2" > /tmp/zookeeper/2/myid
echo "3" > /tmp/zookeeper/3/myid
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11、设置环境变量
#修改/etc/profile文件
vi /etc/profile
#加入以下配置
export ZOOKEEPER_INSTALL=/apps/zookeeper-3.4.14
export PATH=$PATH:$ZOOKEEPER_INSTALL/bin
#使配置生效
source /etc/profile
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12、启动zookeeper
zkServer.sh start /apps/zookeeper-3.4.14/conf/zoo1.cfg
zkServer.sh start /apps/zookeeper-3.4.14/conf/zoo2.cfg
zkServer.sh start /apps/zookeeper-3.4.14/conf/zoo3.cfg
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10、查看zookeeper状态
zkServer.sh status /apps/zookeeper-3.4.14/conf/zoo1.cfg
zkServer.sh status /apps/zookeeper-3.4.14/conf/zoo2.cfg
zkServer.sh status /apps/zookeeper-3.4.14/conf/zoo3.cfg
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zookeeper连接测试
zkCli.sh -server worker:2181
11、停止zookeeper
zkServer.sh stop /apps/zookeeper-3.4.14/conf/zoo1.cfg
zkServer.sh stop /apps/zookeeper-3.4.14/conf/zoo2.cfg
zkServer.sh stop /apps/zookeeper-3.4.14/conf/zoo3.cfg
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