阿里云CentOS7安装ZooKeeper单机模式

前提条件

阿里云CentOS7安装好jdk，可参 hadoop安装的jdk安装部分

下载

[hadoop@node1 ~]$ cd softinstall
[hadoop@node1 softinstall]$ wget https://archive.apache.org/dist/zookeeper/zookeeper-3.7.1/apache-zookeeper-3.7.1-bin.tar.gz

解压

[hadoop@node1 softinstall]$ ls
apache-zookeeper-3.7.1-bin.tar.gz  hadoop-3.3.4.tar.gz  jdk-8u271-linux-x64.tar.gz
[hadoop@node1 softinstall]$ tar -zxvf apache-zookeeper-3.7.1-bin.tar.gz -C ~/soft

查看解压后的文件

[hadoop@node1 softinstall]$ cd ~/soft
[hadoop@node1 soft]$ ls
apache-zookeeper-3.7.1-bin  hadoop-3.3.4  jdk1.8.0_271

配置环境变量

[hadoop@node1 soft]$ sudo nano /etc/profile.d/my_env.sh

末尾添加如下内容

export ZOOKEEPER_HOME=/home/hadoop/soft/apache-zookeeper-3.7.1-bin
export PATH=$PATH:$ZOOKEEPER_HOME/bin

让配置生效

source /etc/profile

配置ZooKeeper

[hadoop@node1 soft]$ cd $ZOOKEEPER_HOME/conf
[hadoop@node1 conf]$ ls
configuration.xsl  log4j.properties  zoo_sample.cfg
[hadoop@node1 conf]$ mv zoo_sample.cfg zoo.cfg
[hadoop@node1 conf]$ nano zoo.cfg

修改dataDir的值如下

dataDir=/home/hadoop/soft/apache-zookeeper-3.7.1-bin/zkData

启动ZooKeeper服务

[hadoop@node1 conf]$ zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /home/hadoop/soft/apache-zookeeper-3.7.1-bin/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

看到Starting zookeeper ... STARTED输出，说明启动成功

查看进程

[hadoop@node1 conf]$ jps
20178 Jps
18391 QuorumPeerMain

QuorumPeerMain进程是ZooKeeper服务端的进程。

查看状态

[hadoop@node1 conf]$ zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /home/hadoop/soft/apache-zookeeper-3.7.1-bin/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: standalone

看到Mode为standalone（单机）模式。

ZooKeeper命令行的简单操作

进入客户端

[hadoop@node1 conf]$ zkCli.sh

看到部分输出信息如下

2024-03-28 21:17:48,132 [myid:] - INFO  [main:ClientCnxn@1735] - zookeeper.request.timeout value is 0. feature enabled=false
Welcome to ZooKeeper!
2024-03-28 21:17:48,166 [myid:localhost:2181] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1171] - Opening socket connection to server localhost/127.0.0.1:2181.
2024-03-28 21:17:48,167 [myid:localhost:2181] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1173] - SASL config status: Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2024-03-28 21:17:48,203 [myid:localhost:2181] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1005] - Socket connection established, initiating session, client: /127.0.0.1:52730, server: localhost/127.0.0.1:2181
2024-03-28 21:17:48,287 [myid:localhost:2181] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1446] - Session establishment complete on server localhost/127.0.0.1:2181, session id = 0x10005db0b280000, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0]

查看帮助

[zk: localhost:2181(CONNECTED) 0] help
ZooKeeper -server host:port -client-configuration properties-file cmd argsaddWatch [-m mode] path # optional mode is one of [PERSISTENT, PERSISTENT_RECURSIVE] - default is PERSISTENT_RECURSIVEaddauth scheme authclose config [-c] [-w] [-s]connect host:portcreate [-s] [-e] [-c] [-t ttl] path [data] [acl]delete [-v version] pathdeleteall path [-b batch size]delquota [-n|-b|-N|-B] pathget [-s] [-w] pathgetAcl [-s] pathgetAllChildrenNumber pathgetEphemerals pathhistory listquota pathls [-s] [-w] [-R] pathprintwatches on|offquit reconfig [-s] [-v version] [[-file path] | [-members serverID=host:port1:port2;port3[,...]*]] | [-add serverId=host:port1:port2;port3[,...]]* [-remove serverId[,...]*]redo cmdnoremovewatches path [-c|-d|-a] [-l]set [-s] [-v version] path datasetAcl [-s] [-v version] [-R] path aclsetquota -n|-b|-N|-B val pathstat [-w] pathsync pathversion whoami 
Command not found: Command not found help

退出客户端

[zk: localhost:2181(CONNECTED) 1] quit

WATCHER::

WatchedEvent state:Closed type:None path:null
2024-03-28 21:18:00,150 [myid:] - INFO  [main:ZooKeeper@1288] - Session: 0x10005db0b280000 closed
2024-03-28 21:18:00,151 [myid:] - INFO  [main-EventThread:ClientCnxn$EventThread@568] - EventThread shut down for session: 0x10005db0b280000
2024-03-28 21:18:00,154 [myid:] - ERROR [main:ServiceUtils@48] - Exiting JVM with code 127

关闭ZooKeeper服务端

[hadoop@node1 conf]$ zkServer.sh stop
ZooKeeper JMX enabled by default
Using config: /home/hadoop/soft/apache-zookeeper-3.7.1-bin/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED

查看进程