software | version | download |
---|---|---|
centos | 7.2 | 省略 |
jdk | 1.8 | http://www.oracle.com/technet... |
zookeeper | 3.4.9 | https://mirrors.tuna.tsinghua... |
按照上述提供的地址下载zookeeper后,使用命令tar -zxvf zookeeper-3.4.9.tar.gz进行解压后,可得到下图的文件目录结构
zk的可执行脚本目录,包括zk服务进程,zk客户端,等脚本。其中,.sh是Linux环境下的脚本,.cmd是Windows环境下的脚本。
配置文件目录。zoo_sample.cfg为样例配置文件,需要修改为自己的名称,一般为zoo.cfg。log4j.properties为日志配置文件。
一些用于操作zk的工具包。
zk某些用法的代码示例
复制 zoo_sample.cfg 文件的并命名为为 zoo.cfg
cp zoo_sample.cfg zoo.cfg
修改配置文件zoo.cfg
# The number of milliseconds of each ticktickTime=2000 # The number of ticks that the initial# synchronization phase can takeinitLimit=10 # The number of ticks that can pass between# sending a request and getting an acknowledgementsyncLimit=5 # the directory where the snapshot is stored.# do not use /tmp for storage, /tmp here is just# example sakes.dataDir=/data/ms/zookeeper-3.4.9/datadataLogDir=/data/ms/zookeeper-3.4.9/logs # the port at which the clients will connectclientPort=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=1server.1=zk149:2888:3888server.2=zk150:2888:3888server.3=zk151:2888:3888
配置项说明
配置项 | 说明 |
---|---|
initLimit | ZooKeeper集群模式下包含多个zk进程,其中一个进程为leader,余下的进程为follower。 当follower最初与leader建立连接时,它们之间会传输相当多的数据,尤其是follower的数据落后leader很多。initLimit配置follower与leader之间建立连接后进行同步的最长时间。 |
syncLimit | 配置follower和leader之间发送消息,请求和应答的最大时间长度。 |
tickTime | tickTime则是上述两个超时配置的基本单位,例如对于initLimit,其配置值为5,说明其超时时间为 2000ms * 5 = 10秒。 |
server.id=host:port1:port2 | 其中id为一个数字,表示zk进程的id,这个id也是dataDir目录下myid文件的内容。host是该zk进程所在的IP地址,port1表示follower和leader交换消息所使用的端口,port2表示选举leader所使用的端口。 |
dataDir | 其配置的含义跟单机模式下的含义类似,不同的是集群模式下还有一个myid文件。myid文件的内容只有一行,且内容只能为1 - 255之间的数字,这个数字亦即上面介绍server.id中的id,表示zk进程的id。 |
dataLogDir | zookeeper日志存储路径 |
配置环境变量
vim /etc/profile
并在其尾部追加如下内容:
ZOOKEEPER_HOME=/data/ms/zookeeper-3.4.9JAVA_HOME=/data/java/jdk1.8.0_111JRE_HOME=/data/java/jdk1.8.0_111/jreCLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATHPATH=$JAVA_HOME/bin:$JRE_HOME/bin:$ZOOKEEPER_HOME/bin:$PATH
刷新环境变量
source /etc/profile
关闭系统防火墙或配置防火墙规则
systemctl stop firewalld.service
禁用防火墙命令 systemctl disable firewalld.service
停止防火墙 systemctl stop firewalld.service
启动 zookeeper 服务
zkServer.sh start如打印如下信息则表明启动成功:ZooKeeper JMX enabled by defaultUsing config: /usr/local/services/zookeeper/zookeeper-3.4.9/bin/../conf/zoo.cfg Starting zookeeper ... STARTED
查看zookeeper 服务状态
zkServer.sh status
关闭zookeeper服务
zkServer.sh stop如打印如下信息则表明成功关闭:ZooKeeper JMX enabled by defaultUsing config: /usr/local/services/zookeeper/zookeeper-3.4.9/bin/../conf/zoo.cfgStopping zookeeper ... STOPPED
重启zookeeper服务
zkServer.sh restart如打印如下信息则表明重启成功:ZooKeeper JMX enabled by defaultUsing config: /usr/local/services/zookeeper/zookeeper-3.4.9/bin/../conf/zoo.cfgZooKeeper JMX enabled by defaultUsing config: /usr/local/services/zookeeper/zookeeper-3.4.9/bin/../conf/zoo.cfgStopping zookeeper ... STOPPEDZooKeeper JMX enabled by defaultUsing config: /usr/local/services/zookeeper/zookeeper-3.4.9/bin/../conf/zoo.cfgStarting zookeeper ... STARTED
新建zookeeper脚本
[[email protected] ~]# cd /etc/rc.d/init.d/ [[email protected] init.d]# pwd /etc/rc.d/init.d [[email protected] init.d]# vim zookeeper
#!/bin/bash #chkconfig:2345 20 90 #description:zookeeper #processname:zookeeper export JAVA_HOME=/data/java/jdk1.8.0_111export ZOOKEEPER_HOME=/data/ms/zookeeper-3.4.9case $1 in start) su root $ZOOKEEPER_HOME/bin/zkServer.sh start;; stop) su root $ZOOKEEPER_HOME/bin/zkServer.sh stop;; status) su root $ZOOKEEPER_HOME/bin/zkServer.sh status;; restart) su $ZOOKEEPER_HOME/bin/zkServer.sh restart;; *) echo "require start|stop|status|restart" ;;esac
给zookeeper脚本授可执行权限
chmod +x zookeeper
添加开机自启动服务
chkconfig --add zookeeper
查看自启动状态
chkconfig --list
Note: This output shows SysV services only and does not include native systemd services. SysV configuration data might be overridden by native systemd configuration. If you want to list systemd services use 'systemctl list-unit-files'. To see services enabled on particular target use 'systemctl list-dependencies [target]'.netconsole 0:off 1:off 2:off 3:off 4:off 5:off 6:offnetwork 0:off 1:off 2:on 3:on 4:on 5:on 6:offvmware-tools 0:off 1:off 2:on 3:on 4:on 5:on 6:offzookeeper 0:off 1:off 2:on 3:on 4:on 5:on 6:off
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