【分布式协调zookeeper】部署篇

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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/profile
export JAVA_HOME=/usr/java/jdk1.7.0_67
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$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=2000
initLimit=10
syncLimit=5
dataDir=/opt/zookeeper/data
clientPort=2181
server.1=10.0.55.3:2888:3888
server.2=10.0.55.5:2888:3888
server.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 start
JMX enabled by default
Using config: /opt/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
--- 检查端口 ---
netstat -lnpt
Active 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: 2181
Mode: leaderJMX enabled by default              ## 这里面的mode信息中，该主机被选举为 Leader
Using config: /opt/zookeeper/bin/../conf/zoo.cfg
10.0.55.3 | SUCCESS | rc=0 >>
Client port found: 2181
Mode: followerJMX enabled by default            ## 这里面的mode信息中，该主机被选举为 follower
Using config: /opt/zookeeper/bin/../conf/zoo.cfg
10.0.55.6 | SUCCESS | rc=0 >>
Client port found: 2181
Mode: followerJMX enabled by default            ## 这里面的mode信息中，该主机被选举为 follower
Using config: /opt/zookeeper/bin/../conf/zoo.cfgzookeeper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 helloworld
Created /workers
--- 使用get -s命令查看znode数据 ---
[zk: localhost:2181(CONNECTED) 1] get -s /workers
helloworld
cZxid = 0x500000006
ctime = Sat Apr 22 10:33:42 CST 2017
mZxid = 0x500000006
mtime = Sat Apr 22 10:33:42 CST 2017
pZxid = 0x500000006
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 6
numChildren = 0
--- 使用get -w选项，进行监听/factory的变化 ---
[zk: localhost:2181(CONNECTED) 11] get -w /workers
strong
--- 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 /workers
cZxid = 0x500000006
ctime = Sat Apr 22 10:33:42 CST 2017
mZxid = 0x500000008
mtime = Sat Apr 22 10:35:25 CST 2017
pZxid = 0x50000000c
cversion = 4
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 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/commands
http://10.0.55.3:8080/commands/stats

　　

　　

　　【分布式协调系统zookeeper】基础篇