Zookeeper安装
简介
ZooKeeper是一个分布式的，开放源码的分布式应用程序协调服务，是Google的Chubby一个开源的实现，是Hadoop和Hbase的重要组件。它是一个为分布式应用提供一致性服务的软件，提供的功能包括：配置维护、域名服务、分布式同步、组服务等。
ZooKeeper的目标就是封装好复杂易出错的关键服务，将简单易用的接口和性能高效、功能稳定的系统提供给用户。
ZooKeeper包含一个简单的原语集，提供Java和C的接口。
ZooKeeper代码版本中，提供了分布式独享锁、选举、队列的接口，代码在zookeeper-3.4.8\src\recipes。其中分布锁和队列有Java和C两个版本，选举只有Java版本。
ZooKeeper的目标就是封装好复杂易出错的关键服务，将简单易用的接口和性能高效、功能稳定的系统提供给用户。
ZooKeeper包含一个简单的原语集，提供Java和C的接口。
ZooKeeper代码版本中，提供了分布式独享锁、选举、队列的接口，代码在zookeeper-3.4.8\src\recipes。其中分布锁和队列有Java和C两个版本，选举只有Java版本。
安装包下载
安装包下载可到Apache网站：
https://www.apache.org/dyn/closer.cgi/zookeeper/
或者镜像网站：
https://mirrors.cnnic.cn/apache/zookeeper/
选择一个版本下载
安装ZooKeeper
解压安装包后复制到 /usr/local/zookeeper
修改zoo_sample.cfg 文件名(/usr/local/zookeeper/conf) 为 zoo.cfg
主要修改一下日志位置，具体配置文件如下：
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# 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=/tmp/zookeeper/data dataLogDir=/tmp/zookeeper/log # the port at which the clients will connect clientPort=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=1 |
配置文件简单解析
1、tickTime：这个时间是作为 Zookeeper 服务器之间或客户端与服务器之间维持心跳的时间间隔，也就是每个 tickTime 时间就会发送一个心跳。
2、dataDir：顾名思义就是 Zookeeper 保存数据的目录，默认情况下，Zookeeper 将写数据的日志文件也保存在这个目录里。
3、dataLogDir：顾名思义就是 Zookeeper 保存日志文件的目录
4、clientPort：这个端口就是客户端连接 Zookeeper 服务器的端口，Zookeeper 会监听这个端口，接受客户端的访问请求。
启动ZooKeeper
运行bin/zkServer.sh
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[root@localhost bin]# sh zkServer.sh ZooKeeper JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Usage: zkServer.sh {start|start-foreground|stop|restart|status|upgrade|print-cmd} |
启动后可以用客户端连一下
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[root@localhost bin]# sh zkCli.sh 127.0.0.1:2181 Connecting to localhost:2181 2018-05-31 11:32:14,558 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.12-e5259e437540f349646870ea94dc2658c4e44b3b, built on 03/27/2018 03:55 GMT 2018-05-31 11:32:14,571 [myid:] - INFO [main:Environment@100] - Client environment:host.name=localhost 2018-05-31 11:32:14,571 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.8.0_102 2018-05-31 11:32:14,584 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=Oracle Corporation 2018-05-31 11:32:14,584 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64/jre 2018-05-31 11:32:14,584 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/usr/local/zookeeper/bin/../build/classes:/usr/local/zookeeper/bin/../build/lib/*.jar:/usr/local/zookeeper/bin/../lib/slf4j-log4j12-1.7.25.jar:/usr/local/zookeeper/bin/../lib/slf4j-api-1.7.25.jar:/usr/local/zookeeper/bin/../lib/netty-3.10.6.Final.jar:/usr/local/zookeeper/bin/../lib/log4j-1.2.17.jar:/usr/local/zookeeper/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper/bin/../lib/audience-annotations-0.5.0.jar:/usr/local/zookeeper/bin/../zookeeper-3.4.12.jar:/usr/local/zookeeper/bin/../src/java/lib/*.jar:/usr/local/zookeeper/bin/../conf: 2018-05-31 11:32:14,585 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib 2018-05-31 11:32:14,585 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp 2018-05-31 11:32:14,585 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA> 2018-05-31 11:32:14,585 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux 2018-05-31 11:32:14,585 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=amd64 2018-05-31 11:32:14,585 [myid:] - INFO [main:Environment@100] - Client environment:os.version=3.10.0-514.el7.x86_64 2018-05-31 11:32:14,585 [myid:] - INFO [main:Environment@100] - Client environment:user.name=root 2018-05-31 11:32:14,585 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/root 2018-05-31 11:32:14,585 [myid:] - INFO [main:Environment@100] - Client environment:user.dir=/usr/local/zookeeper/bin 2018-05-31 11:32:14,587 [myid:] - INFO [main:ZooKeeper@441] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@531d72ca ZooKeeper -server host:port cmd args stat path [watch] set path data [version] ls path [watch] delquota [-n|-b] path ls2 path [watch] setAcl path acl setquota -n|-b val path history redo cmdno printwatches on|off delete path [version] sync path listquota path rmr path get path [watch] create [-s] [-e] path data acl addauth scheme auth quit getAcl path close connect host:port |
OK，安装成功，很简单，别忘了开放防火墙端口哦！！！
参考资料：
https://blog.csdn.net/tlk20071/article/details/52028945
