zookeeper群集
环境：建议3-5台服务器ip hostname id
10.100.11.13 z1 1
10.100.11.14 z2 2
10.100.11.17 z3 3
绑定 ip hostname到 /etc/hosts
1 java环境部署
1.1 下载jdkjdk-8u77-linux-x64.tar.gz http://download.oracle.com/otn-pub/java/jdk/8u77-b03/jdk-8u77-linux-x64.tar.gz
把 jdk-8u77-linux-x64.tar.gz 解压为 /usr/local/jdk
添加环境变量
/etc/profile 文件中添加
## JAVA
export JAVA_HOME=/usr/local/jdk
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
并把 /usr/local/jdk/bin添加到 PATH中
. /etc/profile重载 profile配置
2 zookeeper安装
以z1为例：
把zookeeper-3.4.8.tar.gz (www.apache.org下载)解压到到 /usr/local/zookeeper
/usr/local/zookeeper/bin添加到PATH环境变量中
2.1 配置zoo.cfg
/usr/local/zookeeper/conf/zoo.cfg
######
tickTime=2000
dataDir=/var/lib/zookeeper
clientPort=2181
initLimit=5
syncLimit=2
server.1=z1:2888:3888
server.2=z2:2888:3888
server.3=z3:2888:3888
#####
注意server.后面的号要与myid号对应上，范围0-255
snapshot、log文件将保存在dataDir目录下，配置dataLogDir=/var/lib/zookeeper/logs，log将生成于dataLogDir目录下
2.2 创建 myid 文件，保存id号。存放在zoo.cfg文件中指定的dataDir目录下
echo 1 > /var/lib/zookeeper/myid
2.3 zookeeper启动脚本
先在 /usr/local/zookeeper/bin/zkEnv.sh 在#!/usr/bin/env bash行下添加下面这行
export JAVA_HOME=/usr/local/java/jdk
vi /etc/init.d/zk
##############
#!/bin/sh
#
# Startup script for the ZooKeeper daemon
#
# processname: ZooKeeper
# pidfile: /var/run/ZooKeeper.pid
# config: /usr/local/zookeeper/conf/zoo.cfg
# chkconfig: - 21 79
# description: Start and stop ZooKeeper
# Source function library
. /etc/rc.d/init.d/functions
RETVAL=0
prog="ZooKeeper"
prog_bin=/usr/local/zookeeper/bin/zkServer.sh
start() {
echo -n $"Starting $prog: "
daemon $prog_bin start
#/usr/local/zookeeper/bin/zkServer.sh start
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/$prog
}
stop() {
echo -n $"Stopping $prog: "
daemon $prog_bin stop
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$prog
}
status() {
$prog_bin status
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
status)
status
;;
*)
echo "Usage: $0 {start|stop|restart|status}"
exit 1
esac
exit $RETVAL
##############
chmod +x /etc/init.d/zk
2.3.2 CentOS 7 zookeeper启动脚本
vi /usr/lib/systemd/system/zk.service
##############
Description=Startup script for the ZooKeeper daemon
Documentation=http://zookeeper.apache.org/
After=network.target remote-fs.target nss-lookup.target
Type=forking
ExecStart=/usr/local/zookeeper/bin/zkServer.sh start
ExecReload=/bin/kill -HUP $MAINPID
ExecStop=/usr/local/zookeeper/bin/zkServer.sh stop
PrivateTmp=true
WantedBy=multi-user.target
##############
systemctl enable zk
systemctl start zk
z2, z3参照z1,注意myid文件内容的 ID号要与配置文件中的 server.x对应上
PS：
zkServer.sh status 查看状态
zkCli.sh -server ip:2181 # zk cli操作
ls / # 列出节点
create /web1'webgroup' # 创建节点
默认情况，启动脚本启动zookeeper失败原因：
首先需要知道 交互式shell和非交互式shell、登录shell和非登录shell是有区别的
在登录shell里，环境信息需要读取/etc/profile和~ /.bash_profile, ~/.bash_login, and ~/.profile按顺序最先的一个，并执行其中的命令。除非被 --noprofile选项禁止了； 在非登录shell里，环境信息只读取 /etc/bash.bashrc和~/.bashrc
手工执行是属于登陆shell，脚本执行数据非登陆shell，而我的linux环境配置中只对/etc/profile进行了jdk1.7等环境的配置，所以脚本执行/usr/local/zookeeper/bin/zkServer.sh start 启动zookeeper失败了
解决方法（下面3个方法任选1）：
1、脚本代码中添加“source /etc/profile;” 改为：ssh crxy$i "source /etc/profile;/usr/local/zookeeper/bin/zkServer.sh start"
2、把profile的配置信息echo到.bashrc中echo 'source /etc/profile' >> ~/.bashrc
3、在/zookeeper/bin/zkEnv.sh的中开始位置添加 export JAVA_HOME=/usr/local/jdk1.7.0_45（就像hadoop中对hadoop-env.sh的配置一样）
若其中一个节点故障，如突然停电、磁盘故障再修复，导致zk启动失败，
```
zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.
查看zookeeper.out
2018-02-23 14:10:29,993 - INFO - Reading configuration from: /usr/local/zookeeper/bin/../conf/zoo.cfg
2018-02-23 14:10:30,003 - INFO - Resolved hostname: 192.168.1.75 to address: /192.168.1.75
2018-02-23 14:10:30,004 - INFO - Resolved hostname: 192.168.1.69 to address: /192.168.1.69
2018-02-23 14:10:30,004 - INFO - Resolved hostname: 192.168.1.68 to address: /192.168.1.68
2018-02-23 14:10:30,004 - INFO - Resolved hostname: 192.168.1.214 to address: /192.168.1.214
2018-02-23 14:10:30,004 - INFO - Resolved hostname: 192.168.1.213 to address: /192.168.1.213
2018-02-23 14:10:30,004 - INFO - Defaulting to majority quorums
2018-02-23 14:10:30,006 - INFO - autopurge.snapRetainCount set to 3
2018-02-23 14:10:30,006 - INFO - autopurge.purgeInterval set to 0
2018-02-23 14:10:30,007 - INFO - Purge task is not scheduled.
2018-02-23 14:10:30,014 - INFO - Starting quorum peer
2018-02-23 14:10:30,021 - INFO - binding to port 0.0.0.0/0.0.0.0:4180
2018-02-23 14:10:30,025 - INFO - tickTime set to 2000
2018-02-23 14:10:30,025 - INFO - minSessionTimeout set to -1
2018-02-23 14:10:30,026 - INFO - maxSessionTimeout set to -1
2018-02-23 14:10:30,026 - INFO - initLimit set to 5
2018-02-23 14:10:45,543 - ERROR - Unable to load database on disk
java.io.IOException: Transaction log: /data/zookeeper/logs/version-2/log.24f7000209f2 has invalid magic number 1331917856 != 1514884167
at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.inStreamCreated(FileTxnLog.java:584)
at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.createInputArchive(FileTxnLog.java:600)
at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.goToNextLog(FileTxnLog.java:566)
at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:648)
at org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:158)
```
加载数据数据失败
处理方法：
删除 dataDir 目录下除文件myid外的其他文件或目录，然后重启zk
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