Red Hat Linux 6.5 安装Zookeeper集群
一,安装环境:
操作系统:Red Hat Linux 6.5JDK版本:1.8.0_151 //需先安装JDKZookeeper版本:3.4.12
设置每个节点的hosts文件。# vi /etc/hosts //添加以下内容 10.11.111.42 mrzwk-5 10.11.111.43 mrzwk-6 10.11.111.45 mrzwk-8重启生效。(reboot)
二、安装zookeeper集群# cd /home/weihu # mkdir kafka //解压 # tar -zxvf zookeeper-3.4.12.tar.gz -C kafka #cd kafka //创建链接 # ln -s zookeeper-3.4.12 zookeeper # cd zookeeper //创建日志目录 # mkdir -pv logs //创建数据目录 # mkdir -pv data
配置zookeeper环境变量# vi /etc/profile export PATH=/home/weihu/kafka/zookeeper/bin:$PATH 保存退出 //初始化 # source /etc/profile配置zookeeper集群:
集群节点数量要为奇数,且至少有3个节点,因为ZooKeeper集群是以宕机个数过半才会让整个集群宕机的。搭建ZooKeeper集群时,一定要先停止所有已经启动的节点。
修改配置文件:
# cd /home/weihu/kafka/zookeeper/conf # cp zoo_sample.cfg zoo.cfg #vi zoo.cfg 增加或修改成如下代码: # 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=/home/weihu/kafka/zookeeper/data dataLogDir=/home/weihu/kafka/zookeeper/logs # the port at which the clients will connect clientPort=2181 server.1=10.11.111.42:2888:3888 server.2=10.11.111.43:2888:3888 server.3=10.11.111.45:2888:3888 # the maximum number of client connections. # increase this if you need to handle more clients maxClientCnxns=60创建myid文件:
在mrzwk-5上执行:# echo 1 > /home/weihu/kafka/zookeeper/data/myid 在mrzwk-6上执行:# echo 2 > /home/weihu/kafka/zookeeper/data/myid 在mrzwk-8上执行:# echo 3 > /home/weihu/kafka/zookeeper/data/myid备注:myid文件中只有一行内容,且内容为该节点对应的server.id中的id编号
启动zookeeper集群:# cd /home/weihu/kafka/zookeeper/bin
# zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /home/weihu/kafka/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED查看zookeeper进程:# jps //显示当前所有Java进程的PID
6470 Jps
6316 QuorumPeerMain查看zookeeper集群状态:
# zkServer.sh status上述步骤分别在三台服务器上执行,在mrzwk-5上:
# zkServer.sh status ZooKeeper JMX enabled by default Using config: /home/weihu/kafka/zookeeper/bin/../conf/zoo.cfg Mode: follower
在mrzwk-6上:
# zkServer.sh status ZooKeeper JMX enabled by default Using config: /home/weihu/kafka/zookeeper/bin/../conf/zoo.cfg Mode: follower在mrzwk-8上:# zkServer.sh status ZooKeeper JMX enabled by default Using config: /home/weihu/kafka/zookeeper/bin/../conf/zoo.cfg Mode: leader备注:正常情况下应该是1个leader节点,2个follower节点
若zkServer.sh status命令执行显示-bash: zkServer.sh: command not found
命令改为./zkServer.sh status可正常执行
连接zookeeper集群:# zkCli.sh -server mrzwk-5:2181,mrzwk-6:2181,mrzwk-8:2181成功连接后,可以看到如下输出:Welcome to ZooKeeper! 2018-05-04 10:39:27,990 [myid:] - INFO [main-SendThread(mrzwk-5:2181):ClientCnxn$SendThread@1028] - Opening socket connection to server mrzwk-5/10.11.111.42:2181. Will not attempt to authenticate using SASL (unknown error) JLine support is enabled 2018-05-04 10:39:28,071 [myid:] - INFO [main-SendThread(mrzwk-5:2181):ClientCnxn$SendThread@878] - Socket connection established to mrzwk-5/10.11.111.42:2181, initiating session [zk: mrzwk-5:2181,mrzwk-6:2181,mrzwk-8:2181(CONNECTING) 0] 2018-05-04 10:39:28,116 [myid:] - INFO [main-SendThread(mrzwk-5:2181):ClientCnxn$SendThread@1302] - Session establishment complete on server mrzwk-5/10.11.111.42:2181, sessionid = 0x30000a829550000, negotiated timeout = 30000 WATCHER:: WatchedEvent state:SyncConnected type:None path:null [zk: mrzwk-5:2181,mrzwk-6:2181,mrzwk-8:2181(CONNECTED) 0]
三,可能遇到的报错
1,报错:Zookeeper启动成功,zkServer.sh status 报错# zkServer.sh start ZooKeeper JMX enabled by default Using config: /home/weihu/kafka/zookeeper/bin/../conf/zoo.cfg Starting zookeeper ... STARTED # zkServer.sh status ZooKeeper JMX enabled by default Using config: /home/weihu/kafka/zookeeper/bin/../conf/zoo.cfg Error contacting service. It is probably not running.原因:
- zoo.cfg文件配置出错:dataLogDir指定的目录未被创建
- myid文件中的整数格式不对,或者与zoo.cfg中的server整数不对应
- 防火墙相关端口是否开启(2181,2888,3888)
- ZooKeeper集群IP不能正确映射
单机模式正常,且单机模式下能互相访问,切换至分布式Zookeeper启动成功,zkServer.sh status 报错。
zookeeper.out日志输出如下:
解决:更改配置文件zoo.cfg
在mrzwk-5上: server.1=0.0.0.0:2888:3888 server.2=10.11.111.43:2888:3888 server.3=10.11.111.45:2888:3888
在mrzwk-6上:server.1=10.11.111.42:2888:3888 server.2=0.0.0.0:2888:3888 server.3=10.11.111.45:2888:3888
在mrzwk-8上:server.1=10.11.111.42:2888:3888 server.2=10.11.111.43:2888:3888 server.3=0.0.0.0:2888:3888
保存配置文件,并重启服务。
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