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1. Environment preparation operating system: centOS-6.8 2.6.32-642.el6.x86_64 [virtual machine environment] Node host: 10.0.55.3, 10.0.55.5, 10.0.55.6 directory structure: / opt/ software version: jdk-7u67-linux-x64.rpm zookeeper-3.5.0-alpha.tar.gz II. Install Java environment $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 effective immediately $source / etc/profile 3. Download the zookeeper package and create zookeeper management data $wget http://archive.apache.org/dist/zookeeper/zookeeper-3.5.0-alpha/zookeeper-3.5.0-alpha.tar.gz$ ln-s / opt/zookeeper-3.5.0-alpha / opt/zookeeper$ mkdir / opt/zookeeper/data$ echo "1" > / opt/zookeeper/data/ Myid IV, edit the zookeeper/conf/zoo.cfg configuration file You need $cp / opt/zookeeper/conf/zoo_sample.cfg / opt/zookeeper/conf/zoo.cfg--- to view the zoo.cfg content when starting-tickTime=2000initLimit=10syncLimit=5dataDir=/opt/zookeeper/dataclientPort=2181server.1=10.0.55.3:2888:3888server.2=10.0.55.5:2888:3888server.3=10.0.55.6:2888:3888. Start the zookeeper service and view-start the service-$/ opt/zookeeper/bin/zkServer.sh startJMX enabled by defaultUsing config: / opt/zookeeper/bin/../conf/zoo.cfgStarting zookeeper. STARTED--- check port-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 lnptActive Internet connections 22678 0.0.0.0 Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp * 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 uses automatic operation and maintenance tool ansible for batch distribution

This article only describes how to use the command component module of ansible for node deployment

To save space, the deployment and installation of ansible is not introduced here.

1 、 Remotely install the zookeeper node $ansible webservers-m copy-a 'src=zookeeper-3.5.0-alpha.tar.gz dest=/opt/ owner=root group=root mode=0644'$ 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, Copy the configuration file to the remote node $ansible webservers-m copy-a 'src=/opt/zookeeper/conf/zoo.cfg dest=/opt/zookeeper/conf/zoo.cfg owner=root group=root mode=0644'3, start the zookeeper service in batch and view $ansible webservers-m shell-a' / opt/zookeeper/bin/zkServer.sh stats'$ ansible webservers-m shell-a 'netstat-lnpt'4, Batch insist on zookeeper status $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 # # in the mode information The host is elected as LeaderUsing config: / opt/zookeeper/bin/../conf/zoo.cfg10.0.55.3 | SUCCESS | rc=0 > > Client port found: 2181Mode: followerJMX enabled by default # # in the mode information, the host is elected as followerUsing config: / opt/zookeeper/bin/../conf/zoo.cfg10.0.55.6 | SUCCESS | rc=0 > > Client port found: 2181Mode: followerJMX enabled by default # # in the mode information The host is elected as followerUsing config: / opt/zookeeper/bin/../conf/zoo.cfgzookeeper basic operation to start a CLI client [root@lbl opt] #. / zookeeper/bin/zkCli.sh to create, edit, Delete znode--- [zk: localhost:2181 (CONNECTED) 0] zk: localhost:2181 (CONNECTED) 0] create / workers helloworldCreated / workers--- to create a / workers path using the get-s command to view znode data-[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 = 0murf-use the get-w option Monitor / factory changes-[zk: localhost:2181 (CONNECTED) 11] get-w / workersstrong--- start the client on the follower node and modify / workers-[root@lbl bin] #. / zkCli.sh [zk: localhost:2181 (CONNECTED) 2] set / workers weakness--- view and listen to that host The notification information returned is as follows:-[zk: localhost:2181 (CONNECTED) 12] WATCHER::WatchedEvent state:SyncConnected type:NodeDataChanged path:/workers--- deletes workers's znode-[zk: localhost:2181 (CONNECTED) 7] delete / workers creates sequence 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 through the stat command Check workers status [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 check zookeeper status through the browser-from zookeeper-3.5.0 version or above, you can use the http API to submit a request for a 4-word command -Jetty server is embedded in the zookeeper service as the AdminServer management server, and its default port is 8080. The URL format for service access is "/ commands/ [command name]". For example, access to the stats command-the result returned by the server is to display http://10.0.55.3:8080/commandshttp://10.0.55.3:8080/commands/stats in JSON format.

The Foundation of [distributed Coordination system zookeeper]

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