【分布式协调zookeeper】部署篇

一、环境准备

操作系统：centOS-6.8 2.6.32-642.el6.x86_64【虚拟机环境】节点主机：10.0.55.3、10.0.55.5、10.0.55.6目录结构： /opt/软件版本：   jdk-7u67-linux-x64.rpm            zookeeper-3.5.0-alpha.tar.gz

二、安装Java环境

$ rpm -ivh jdk-7u67-linux-x64.rpm $ cat /etc/profileexport JAVA_HOME=/usr/java/jdk1.7.0_67export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/libexport PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH:$HOME/bin立即生效$ source /etc/profile

三、下载zookeeper包并创建zookeeper管理数据

$ wget http://archive.apache.org/dist/zookeeper/zookeeper-3.5.0-alpha/zookeeper-3.5.0-alpha.tar.gz$ ln -s /opt/zookeeper-3.5.0-alpha /opt/zookeeper$ mkdir /opt/zookeeper/data$ echo "1" > /opt/zookeeper/data/myid

四、编辑zookeeper/conf/zoo.cfg配置文件，启动时需要

$ cp /opt/zookeeper/conf/zoo_sample.cfg /opt/zookeeper/conf/zoo.cfg--- 查看zoo.cfg内容 ---tickTime=2000initLimit=10syncLimit=5dataDir=/opt/zookeeper/dataclientPort=2181server.1=10.0.55.3:2888:3888server.2=10.0.55.5:2888:3888server.3=10.0.55.6:2888:3888

五、启动zookeeper服务并查看

--- 启动服务 ---$ /opt/zookeeper/bin/zkServer.sh startJMX enabled by defaultUsing config: /opt/zookeeper/bin/../conf/zoo.cfgStarting zookeeper ... STARTED--- 检查端口 ---netstat -lnptActive Internet connections (only servers)Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name   tcp        0      0 0.0.0.0:22678               0.0.0.0:*                   LISTEN      1074/sshd           tcp        0      0 :::2181                     :::*                        LISTEN      121685/java         tcp        0      0 :::55369                    :::*                        LISTEN      121685/java         tcp        0      0 ::ffff:10.0.55.3:3888       :::*                        LISTEN      121685/java         tcp        0      0 :::8080                     :::*                        LISTEN      121685/java         tcp        0      0 :::22678                    :::*                        LISTEN      1074/sshd

使用自动化运维工具 ansible 进行批量分发

这里只介绍如何使用ansible的命令组件模块进行节点部署

为了节省篇幅，这里不介绍ansible的部署安装

1、远程安装zookeeper节点

$ ansible webservers -m copy -a 'src=zookeeper-3.5.0-alpha.tar.gz dest=/opt/ owner=root group=root mode=0644'$ ansible webservers -m shell -a 'tar fxz /opt/zookeeper-3.5.0-alpha.tar.gz -C /opt/'$ ansible webservers -m shell -a 'ln -s /opt/zookeeper-3.5.0-alpha /opt/zookeeper'$ ansible webservers -m shell -a 'mkdir /opt/zookeeper/data'$ ansible webservers -m shell -a 'echo "2" >/opt/zookeeper/data/myid'

2、将配置文件copy到远端节点

$ ansible webservers -m copy -a 'src=/opt/zookeeper/conf/zoo.cfg dest=/opt/zookeeper/conf/zoo.cfg owner=root group=root mode=0644'

3、批量启动zookeeper服务并查看

$ ansible webservers -m shell -a '/opt/zookeeper/bin/zkServer.sh stats'$ ansible webservers -m shell -a 'netstat -lnpt'

4、批量坚持zookeeper状态

$ ansible webservers -m shell -a '/opt/zookeeper/bin/zkServer.sh status'10.0.55.5 | SUCCESS | rc=0 >>Client port found: 2181Mode: leaderJMX enabled by default              ## 这里面的mode信息中，该主机被选举为 LeaderUsing config: /opt/zookeeper/bin/../conf/zoo.cfg10.0.55.3 | SUCCESS | rc=0 >>Client port found: 2181Mode: followerJMX enabled by default            ## 这里面的mode信息中，该主机被选举为 followerUsing config: /opt/zookeeper/bin/../conf/zoo.cfg10.0.55.6 | SUCCESS | rc=0 >>Client port found: 2181Mode: followerJMX enabled by default            ## 这里面的mode信息中，该主机被选举为 followerUsing config: /opt/zookeeper/bin/../conf/zoo.cfg

zookeeper基础操作

启动一个CLI客户端

[root@lbl opt]# ./zookeeper/bin/zkCli.sh

创建、编辑、删除znode

--- 创建一个/workers路径的znode ---[zk: localhost:2181(CONNECTED) 0] create /workers helloworldCreated /workers--- 使用get -s命令查看znode数据 ---[zk: localhost:2181(CONNECTED) 1] get -s /workershelloworldcZxid = 0x500000006ctime = Sat Apr 22 10:33:42 CST 2017mZxid = 0x500000006mtime = Sat Apr 22 10:33:42 CST 2017pZxid = 0x500000006cversion = 0dataVersion = 0aclVersion = 0ephemeralOwner = 0x0dataLength = 6numChildren = 0--- 使用get -w选项，进行监听/factory的变化 ---[zk: localhost:2181(CONNECTED) 11] get -w /workersstrong--- 在 follower节点上启动客户端，并修改/workers ---[root@lbl bin]# ./zkCli.sh [zk: localhost:2181(CONNECTED) 2] set /workers weakness---查看监听那台主机，返回的通知信息如下： ---[zk: localhost:2181(CONNECTED) 12] WATCHER::WatchedEvent state:SyncConnected type:NodeDataChanged path:/workers--- 删除workers的znode ---[zk: localhost:2181(CONNECTED) 7] delete /workers

创建序列znode

[zk: localhost:2181(CONNECTED) 13] create -s /workers/worker-Created /workers/worker-0000000000[zk: localhost:2181(CONNECTED) 14] create -s /workers/worker-Created /workers/worker-0000000001[zk: localhost:2181(CONNECTED) 15] create -s /workers/worker-Created /workers/worker-0000000002[zk: localhost:2181(CONNECTED) 16] create -s /workers/worker-Created /workers/worker-0000000003

通过stat命令，进行查看workers状态

[zk: localhost:2181(CONNECTED) 18] stat /workerscZxid = 0x500000006ctime = Sat Apr 22 10:33:42 CST 2017mZxid = 0x500000008mtime = Sat Apr 22 10:35:25 CST 2017pZxid = 0x50000000ccversion = 4dataVersion = 1aclVersion = 0ephemeralOwner = 0x0dataLength = 8numChildren = 4

通过浏览器查看zookeeper状态

--- 从zookeeper-3.5.0版本以上，可以使用http接口提交4字命令的请求；--- 在zookeeper服务中嵌入了Jetty server作为AdminServer管理服务器，其默认端口为8080；--- 服务访问的URL格式是"/commands/[command name]"，例如：访问stats命令--- 服务器返回的结果是以JSON格式显示http://10.0.55.3:8080/commandshttp://10.0.55.3:8080/commands/stats

【分布式协调系统zookeeper】基础篇