安装高可用Hadoop生态 （二） 安装Zookeeper
2. 安装Zookeeper2.1. 解压程序
※ 3台服务器分别执行
tar -xf ~/install/zookeeper-3.4.9.tar.gz -C/opt/cloud/packages
ln -s /opt/cloud/packages/zookeeper-3.4.9 /opt/cloud/bin/zookeeper
ln -s /opt/cloud/packages/zookeeper-3.4.9/conf /opt/cloud/etc/zookeeper
mkdir -p /opt/cloud/data/zookeeper/dat
mkdir -p /opt/cloud/data/zookeeper/logdat
mkdir -p /opt/cloud/logs/zookeeper
2.2. 修改配置文件
2.2.1. 修改zoo.cfg
mv /opt/cloud/etc/zookeeper/zoo_sample.cfg/opt/cloud/etc/zookeeper/zoo.cfg
vi /opt/cloud/etc/zookeeper/zoo.cfg
# 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
=/opt/cloud/data/zookeeper/dat
dataLogDir
=/opt/cloud/data/zookeeper/logdat
# 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
=100
#
# 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=5
# Purge task interval in hours
# Set to "0" to disable auto purge feature
autopurge.purgeInterval=6
# server.A=B:C:D
server.1=hadoop1:2888:3888
server.2=hadoop2:2888:3888
server.3=hadoop3:2888:3888
2.2.2. 修改log配置文件
vi /opt/cloud/etc/zookeeper/log4j.properties
修改配置项
zookeeper.root.logger=INFO, DRFA
zookeeper.log.
dir=/opt/cloud/logs/zookeeper
增加DRFA日志定义
log4j.appender.DRFA=org.apache.log4j.DailyRollingFileAppender
log4j.appender.DRFA.Append
=true
log4j.appender.DRFA.DatePattern
='.'yyyy-MM-dd
log4j.appender.DRFA.File
=${zookeeper.log.dir}/${zookeeper.log.file}
log4j.appender.DRFA.Threshold
=${zookeeper.log.threshold}
log4j.appender.DRFA.layout
=org.apache.log4j.PatternLayout
log4j.appender.DRFA.layout.ConversionPattern
=%d{ISO8601} - %-5p [%t:%C{1}@%L] - %m%n
log4j.appender.DRFA.Encoding
=UTF-8
#log4j.appender.DRFA.MaxFileSize
=20MB
2.2.3. 复制到另外2台服务器
scp /opt/cloud/etc/zookeeper/zoo.cfg hadoop2:/opt/cloud/etc/zookeeper
scp /opt/cloud/etc/zookeeper/log4j.properties hadoop2:/opt/cloud/etc/zookeeper
scp /opt/cloud/etc/zookeeper/zoo.cfg hadoop3:/opt/cloud/etc/zookeeper
scp /opt/cloud/etc/zookeeper/log4j.properties hadoop3:/opt/cloud/etc/zookeeper
2.3. 生成myid
在dataDir目录下创建一个myid文件，然后分别在myid文件中按照zoo.cfg文件的server.A中A的数值，在不同机器上的该文件中填写相应的值。
ssh hadoop1 'echo 1 >/opt/cloud/data/zookeeper/dat/myid'
ssh hadoop2 'echo 2 >/opt/cloud/data/zookeeper/dat/myid'
ssh hadoop3 'echo 3 >/opt/cloud/data/zookeeper/dat/myid'
2.4. 设置环境变量
vi ~/.bashrc
增加
export ZOO_HOME=/opt/cloud/bin/zookeeper
export ZOOCFGDIR
=${ZOO_HOME}/conf
export ZOO_LOG_DIR
=/opt/cloud/logs/zookeeper
export PATH
=$ZOO_HOME/bin:$PATH
即刻生效
source ~/.bashrc
复制到另外两台服务器
scp ~/.bashrc hadoop2:/home/hadoop
scp ~/.bashrc hadoop3:/home/hadoop
2.5. 手工执行
1.启动
zkServer.sh start
2.输入jps命令查看进程
QuorumPeerMain
Jps
其中，QuorumPeerMain是zookeeper进程，启动正常。
3、停止zookeeper进程
zkServer.sh stop
4、启动zookeeper集群
$ cexec 'zkServer.sh start'
************************* cloud *************************
--------- hadoop1---------
ZooKeeper JMX enabled by default
Using config: /opt/cloud/bin/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
--------- hadoop2---------
ZooKeeper JMX enabled by default
Using config: /opt/cloud/bin/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
--------- hadoop3---------
ZooKeeper JMX enabled by default
Using config: /opt/cloud/bin/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
5、查看zookeeper集群状态
$ cexec 'zkServer.sh status'
************************* cloud *************************
--------- hadoop1---------
ZooKeeper JMX enabled by default
Using config: /opt/cloud/bin/zookeeper/bin/../conf/zoo.cfg
Mode: follower
--------- hadoop2---------
ZooKeeper JMX enabled by default
Using config: /opt/cloud/bin/zookeeper/bin/../conf/zoo.cfg
Mode: follower
--------- hadoop3---------
ZooKeeper JMX enabled by default
Using config: /opt/cloud/bin/zookeeper/bin/../conf/zoo.cfg
Mode: leader
6、启动客户端脚本
zkCli.sh
ls /zookeeper
ls /zookeeper/quota
2.6. 系统启动时自动运行
vi /opt/cloud/bin/zookeeper/bin/zkServer.sh
找到
nohup
"$JAVA" "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" \
替换为
nohup
"$JAVA" "-Dlog4j.configuration=file:${ZOOCFGDIR}/log4j.properties" \
复制到另外两台服务器
scp /opt/cloud/bin/zookeeper/bin/zkEnv.sh hadoop2:/opt/cloud/bin/zookeeper/bin/
scp /opt/cloud/bin/zookeeper/bin/zkServer.sh hadoop2:/opt/cloud/bin/zookeeper/bin/
scp /opt/cloud/bin/zookeeper/bin/zkEnv.sh hadoop3:/opt/cloud/bin/zookeeper/bin/
scp /opt/cloud/bin/zookeeper/bin/zkServer.sh hadoop3:/opt/cloud/bin/zookeeper/bin/
vi /etc/systemd/system/zookeeper.service
Description
=Zookeeper service
After
=network.target
User
=hadoop
Group
=hadoop
Type
=forking
Environment
= ZOO_HOME=/opt/cloud/bin/zookeeper
Environment
= ZOOCFGDIR=/opt/cloud/bin/zookeeper/conf
Environment
= ZOO_LOG_DIR=/opt/cloud/logs/zookeeper
ExecStart
=/usr/bin/sh -c '/opt/cloud/bin/zookeeper/bin/zkServer.sh start'
ExecStop
=/usr/bin/sh -c '/opt/cloud/bin/zookeeper/bin/zkServer.sh stop'
WantedBy
=multi-user.target
复制到另外两台服务器
scp /etc/systemd/system/zookeeper.service hadoop2:/etc/systemd/system/
scp /etc/systemd/system/zookeeper.service hadoop3:/etc/systemd/system/
重新加载配置信息：systemctl daemon-reload
启动zookeeper：systemctl start zookeeper
停止zookeeper：systemctl stop zookeeper
查看进程状态及日志（重要）：systemctl status zookeeper
开机自启动：systemctl enable zookeeper
关闭自启动：systemctl disable zookeeper
启动服务设置为自动启动
systemctl daemon-reload
systemctl start zookeeper
systemctl status zookeeper
systemctl enable zookeeper
2.7. 卸载
root用户操作
[*] 停止并卸载zookeeper服务
systemctl stop zookeeper
systemctl disable zookeeper
rm /etc/systemd/system/zookeeper.service -f
[*]复原环境变量
vi ~/.bashrc
删除zookeeper相关行
[*]删除其他文件
rm /opt/cloud/bin/zookeeper/ -rf
rm /opt/cloud/data/zookeeper/ -rf
rm /opt/cloud/logs/zookeeper/ -rf
rm /opt/cloud/packages/zookeeper-3.4.9/ -rf
#如果有高速设备，dateLogDir可以设置在高速设备上以大幅提高效率
设置数据定时清理机制
# server.A=B:C:D:
# 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 表示的是这个服务器与集群中的
Leader 服务器交换信息的端口；
# D 表示用来执行选举时服务器相互通信的端口。
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