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今天是双十一，这个写的比较水。没啥实在东西。在工厂里面。没办法 虽然是java组的，临时支援到其他组，帮助解决一些问题。 现在很困，但是随便写点东西。打发打发时间吧。好困呐。怎么写代码到4点无所谓。。
双十一，你们买的爽，但是我们累到炸了。
扯了好多犊子 = = 开始。
zookeeper其实对于服务器集群确实是一个不错的中间件，可以将各种中间件相互链接起来。有点类似nginx对http请求的负载均衡。它将一个服务的状态保存在各个单机中，当某一个单机状态发生了改变了，它会通知所有的单机发生的变化。也就是watch机制。并且无论访问其他哪一个单机，状态都是一样的。
而最近遇到一个乐观锁的例子，解决同一个定时器的主备问题。类似抢位子。这个之后我会贴出代码。
zookeeper中的角色， 有三种，借用其他的博客的一个图片
http://cailin.iteye.com/blog/2014486/ 原文地址
搭建环境
MacBook pro 15款840 VMWare Fusion8 Centos 6.7 zookeeper-3.4.6.tar.gz
开始贴代码了。
node1:
sjk@192.148.1.104‘s password: Last login: Mon Nov 9 16:46:49 2015 from 192.148.1.102 [sjk@rabbitmq-node1 ~]$ sudo -i [sudo] password for sjk: [root@rabbitmq-node1 ~]# cd /usr/local/ [root@rabbitmq-node1 local]# ls bin games jdk1.7.0_80 lib64 mongodb share tomcat etc include lib libexec sbin src zookeeper [root@rabbitmq-node1 local]# cd zookeeper/ [root@rabbitmq-node1 zookeeper]# ls bin dist-maven LICENSE.txt src build.xml docs NOTICE.txt zookeeper-3.4.6.jar CHANGES.txt ivysettings.xml README_packaging.txt zookeeper-3.4.6.jar.asc conf ivy.xml README.txt zookeeper-3.4.6.jar.md5 contrib lib recipes zookeeper-3.4.6.jar.sha1 [root@rabbitmq-node1 zookeeper]# cd conf/ [root@rabbitmq-node1 conf]# ls configuration.xsl log4j.properties zoo.cfg zoo_sample.cfg [root@rabbitmq-node1 conf]# vim zoo.cfg [root@rabbitmq-node1 conf]# cat 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 syncLimit=5 # the directory where the snapshot is stored. # do not use /tmp for storage, /tmp here is just # example sakes. dataDir=/zookeeper/data # 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 dataLogDir=/zookeeper/log # Be sure to read the maintenance section of the # administrator guide before turning on autopurge. server.1=192.148.1.104:2888:3888 server.2=192.148.1.105:2888:3888 server.3=192.148.1.106:2888:3888 # 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 [root@rabbitmq-node1 conf]# vim /etc/profile [root@rabbitmq-node1 conf]# source /etc/profile [root@rabbitmq-node1 conf]# mkdir -p /zookeeper/log [root@rabbitmq-node1 conf]# mkdir -p /zookeeper/data [root@rabbitmq-node1 conf]# cd /zookeeper/ [root@rabbitmq-node1 zookeeper]# ls data log [root@rabbitmq-node1 zookeeper]# echo $ZOOKEEPER_HOME /usr/local/zookeeper [root@rabbitmq-node1 zookeeper]# cd /usr/local/zookeeper/ [root@rabbitmq-node1 zookeeper]# ls bin dist-maven LICENSE.txt src build.xml docs NOTICE.txt zookeeper-3.4.6.jar CHANGES.txt ivysettings.xml README_packaging.txt zookeeper-3.4.6.jar.asc conf ivy.xml README.txt zookeeper-3.4.6.jar.md5 contrib lib recipes zookeeper-3.4.6.jar.sha1 //dataDir下告诉本机的id [root@rabbitmq-node1 zookeeper]# cd /zookeeper/data/ [root@rabbitmq-node1 data]# ls [root@rabbitmq-node1 data]# vim myid [root@rabbitmq-node1 data]# cat myid 1 [root@rabbitmq-node1 data]# scp -r /usr/local/zookeeper root@192.148.1.105:/usr/local/ [root@rabbitmq-node1 data]# scp -r /usr/local/zookeeper root@192.148.1.106:/usr/local/ [root@rabbitmq-node1 data]# cd /usr/local/zookeeper/bin/ [root@rabbitmq-node1 bin]# ls README.txt zkCli.cmd zkEnv.cmd zkServer.cmd zkCleanup.sh zkCli.sh zkEnv.sh zkServer.sh //三个启动很快。如果很慢 你将会在日志看到报错。 但是重启一下就行了 [root@rabbitmq-node1 bin]# ./zkServer.sh start JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Starting zookeeper ... STARTED [root@rabbitmq-node1 bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Mode: follower [root@rabbitmq-node1 bin]# jps 2344 QuorumPeerMain 2398 Jps [root@rabbitmq-node1 bin]# [root@rabbitmq-node1 bin]# ./zkServer.sh start JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Starting zookeeper … STARTED [root@rabbitmq-node1 bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Mode: follower [root@rabbitmq-node1 bin]# jps 2344 QuorumPeerMain 2398 Jps //查看集群状态 为跟随者 [root@rabbitmq-node1 bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Mode: follower //这是我关掉了其他两个服务后只剩下一个时候 [root@rabbitmq-node1 bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Error contacting service. It is probably not running. [root@rabbitmq-node1 bin]# ./zkServer.sh stop JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Stopping zookeeper ... STOPPED [root@rabbitmq-node1 bin]#
node2:
sjk@192.148.1.105‘s password: Last login: Mon Nov 9 04:15:34 2015 from 192.148.1.102 [sjk@rabbitmq-node2 ~]$ sudo -i [sudo] password for sjk: [root@rabbitmq-node2 ~]# cd /usr/local/ [root@rabbitmq-node2 local]# ls bin games jdk1.7.0_80 lib64 mongodb openssl share tomcat zookeeper etc include lib libexec nginx sbin src usr [root@rabbitmq-node2 local]# mkdir -p /zookeeper/log [root@rabbitmq-node2 local]# mkdir -p /zookeeper/data [root@rabbitmq-node2 local]# cd /zookeeper/data/ [root@rabbitmq-node2 data]# vim myid [root@rabbitmq-node2 data]# cat myid 2 [root@rabbitmq-node2 data]# vim /etc/profile [root@rabbitmq-node2 data]# source /etc/profile [root@rabbitmq-node2 data]# ls myid [root@rabbitmq-node2 data]# cd /usr/local/zookeeper/ [root@rabbitmq-node2 zookeeper]# cd b -bash: cd: b: 没有那个文件或目录 [root@rabbitmq-node2 zookeeper]# cd bin/ [root@rabbitmq-node2 bin]# ls README.txt zkCli.cmd zkEnv.cmd zkServer.cmd zkCleanup.sh zkCli.sh zkEnv.sh zkServer.sh [root@rabbitmq-node2 bin]# ./zkServer.sh start JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Starting zookeeper ... STARTED [root@rabbitmq-node2 bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Mode: leader [root@rabbitmq-node2 bin]# jps 2369 QuorumPeerMain 2429 Jps [root@rabbitmq-node2 bin]# [root@rabbitmq-node2 bin]# ./zkServer.sh start JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Starting zookeeper ... STARTED //为领导者 [root@rabbitmq-node2 bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Mode: leader [root@rabbitmq-node2 bin]# jps 2369 QuorumPeerMain 2429 Jps [root@rabbitmq-node2 bin]# ./zkServer.sh stop JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Stopping zookeeper ... STOPPED
node3：
sjk@192.148.1.106‘s password: Last login: Mon Nov 9 16:47:06 2015 from 192.148.1.102 [sjk@rabbitmq-node3 ~]$ sudo -i [sudo] password for sjk: [root@rabbitmq-node3 ~]# cd /usr/local/zookeeper/ [root@rabbitmq-node3 zookeeper]# ls bin dist-maven LICENSE.txt src build.xml docs NOTICE.txt zookeeper-3.4.6.jar CHANGES.txt ivysettings.xml README_packaging.txt zookeeper-3.4.6.jar.asc conf ivy.xml README.txt zookeeper-3.4.6.jar.md5 contrib lib recipes zookeeper-3.4.6.jar.sha1 [root@rabbitmq-node3 zookeeper]# cd .. [root@rabbitmq-node3 local]# ls bin games jdk1.7.0_80 lib64 mongodb sbin src etc include lib libexec python27 share zookeeper [root@rabbitmq-node3 local]# mkdir -p /zookeeper/log [root@rabbitmq-node3 local]# mkdir -p /zookeeper/data [root@rabbitmq-node3 local]# cd /zookeeper/data/ [root@rabbitmq-node3 data]# vim myid [root@rabbitmq-node3 data]# cat myid 3 //设置zookeeperhome的环境变量 [root@rabbitmq-node3 data]# vim /etc/profile [root@rabbitmq-node3 data]# source /etc/profile [root@rabbitmq-node3 data]# cd /usr/local/zookeeper/bin/ [root@rabbitmq-node3 bin]# ls README.txt zkCli.cmd zkEnv.cmd zkServer.cmd zkCleanup.sh zkCli.sh zkEnv.sh zkServer.sh [root@rabbitmq-node3 bin]# ./zkServer.sh start JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Starting zookeeper ... STARTED [root@rabbitmq-node3 bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Mode: follower [root@rabbitmq-node3 bin]# jps 2344 QuorumPeerMain 2399 Jps //将其中一个节点关闭掉 [root@rabbitmq-node3 bin]# ./zkServer.sh status JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Mode: leader [root@rabbitmq-node3 bin]# ./zkServer.sh stop JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Stopping zookeeper ... STOPPED [root@rabbitmq-node3 bin]#
真水。 等之后和solr的整合吧。 好累 = = 困。。。
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原文地址：http://www.cnblogs.com/YoRuo/p/4956851.html
