Zookeeper在Centos7上搭建单节点应用
(默认机器上已经安装并配置好了jdk)
1、下载zookeeper并解压
$ tar -zxvf zookeeper-3.4.6.tar.gz
2、将解压后的文件夹移动到 /usr/local/ 目录下
$ mv zookeeper-3.4.6/ /usr/local/
3、在zookeeper的目录下新建data 和 logs 两个目录
$ cd /usr/local/zookeeper-3.4.6
$ mkdir data
$ mkdir logs
4、到zookeeper3.4.6/conf目录下将zoo_sample.cfg文件拷贝一份，命名为zoo.cfg
$ cd /usr/local/zookeeper-3.4.6/conf
$ cp zoo_sample.cfg zoo.cfg
5、修改zoo.cfg文件
$ vim 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
# Leader与Follower之间发送消息，请求和应答时间长度，最长不超过多少个tickTime的时间长度
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
#这个地方的目录地址改一下
dataDir=/usr/local/zookeeper-3.4.6/data
#日志目录
dataLogDir=/usr/local/zookeeper-3.4.6/logs
# 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
#配置server
# 192.168.192.130 当前机器的ip
# 2888端口号是zookeeper服务之间通信的端口
# 3888是zookeeper与其他应用程序通信的端口
server.0=192.168.192.130:2888:3888
6、在 /usr/local/zookeeper-3.4.6/data下创建myid文件
$ vim myid
# 这个数字跟步骤5中最下面的server.0要一样
0
7、zookeeper的配置环境变量（配置完成后要记得source /etc/profile 生效修改）
$ vim /etc/profile
# jdk8 enviroment variables
export JAVA_HOME=/home/look/dev-software/jdk/jdk1.8.0_144
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin:$ZOOKEEPER_HOME/bin
# Zookeeper enviroment variables
export ZOOKEEPER_HOME=/usr/local/zookeeper-3.4.6
8、配置防火墙
在防火墙中打开要用到的端口2181，2888，3888。用root权限执行命令。
$ chkconfig iptables on
$ service iptables start
✎编辑 /etc/sysconfig/iptables：
$ vim /etc/sysconfig/iptables
✎增加以下三行：
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2181 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2888 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3888 -j ACCEPT
✎重启防火墙：
$ service iptables restart
✎查看防火墙端口状态：
$ service iptables status
9、启动并测试zookeeper
$ cd /usr/local/zookeeper-3.4.6/bin
✎(1)启动zookeeper
$ ./zkServer.sh start
✎(2)输入jps命令查看进程：
$ jps
1456 QuorumPeerMain
1457 Jps
其中，QuorumPeerMain 是zookeeper进程，启动正常
✎(3)查看状态
$ zkServer.sh status
✎(4)查看zookeeper服务输入信息：
服务信息输入文件在 /usr/local/zookeeper-3.4.6/bin/zookeeper.out
$ tail -200f zookeeper.out
10、停止zookeeper 进程：
$ cd /usr/local/zookeeper-3.4.6/bin
$ zkServer.sh stop
11、配置zookeeper开机启动：
$ vim /etc/rc.local 文件，加入
su - root -c '/usr/local/zookeeper3.4.6/bin/zkServer.sh start'
