apache zookeeper getting started

info

1. centralize servie

   • maintaining configuration infomation

   • naming

   • providing distributed synchronization

   • providing group servies

2. znode container for

   • data

   • other nodes

3. download

4. reference

setup a 3 node cluster

1. setup and config

   1. on host1

       $ sudo mv zookeeper-3.5.0-alpha/ /usr/local/zookeeper
      
       $ mkdir /usr/local/zookeeper/data
       $ chown -R host1 /usr/local/zookeeper
      
       $ export PATH=$PATH:/usr/local/zookeeper/bin
      
       $ pico /usr/local/zookeeper/conf/zoo.cfg
       tickTime=2000
       initLimit=10
       syncLimit=5
       dataDir=/usr/local/zookeeper/data
       clientPort=2181
       server.1=host1:20010:20011
       server.2=host2:20010:20011
       server.3=host2:20010:20011
      
       $ pico /usr/local/zookeeper/data/myid
       1
      

   2. on host2

       $ sudo mv zookeeper-3.5.0-alpha/ /usr/local/zookeeper
      
       $ mkdir /usr/local/zookeeper/data
       $ chown -R host1 /usr/local/zookeeper
      
       $ export PATH=$PATH:/usr/local/zookeeper/bin
      
       $ pico /usr/local/zookeeper/conf/zoo.cfg
       tickTime=2000
       initLimit=10
       syncLimit=5
       dataDir=/usr/local/zookeeper/data
       clientPort=2181
       server.1=host1:20010:20011
       server.2=host2:20010:20011
       server.3=host2:20010:20011
      
       $ pico /usr/local/zookeeper/data/myid
       2
      

   3. on host3

       $ sudo mv zookeeper-3.5.0-alpha/ /usr/local/zookeeper
      
       $ mkdir /usr/local/zookeeper/data
       $ chown -R host1 /usr/local/zookeeper
      
       $ export PATH=$PATH:/usr/local/zookeeper/bin
      
       $ pico /usr/local/zookeeper/conf/zoo.cfg
       tickTime=2000
       initLimit=10
       syncLimit=5
       dataDir=/usr/local/zookeeper/data
       clientPort=2181
       server.1=host1:20010:20011
       server.2=host2:20010:20011
       server.3=host2:20010:20011
      
       $ pico /usr/local/zookeeper/data/myid
       3
      

2. start

   1. on host1

       $ zkServer.sh start
      

   2. on host2

       $ zkServer.sh start
      

   3. on host3

       $ zkServer.sh start
      

3. status

   1. on host1

       $ zkServer.sh status
      

   2. on host2

       $ zkServer.sh status
      

   3. on host3

       $ zkServer.sh status
      

4. client demo

        $ zkCli.sh -server host1:2181
        [zk:...] ls
        [zk:...] create /my_app /somedata
        [zk:...] ls
        [zk:...] get /my_app
        [zk:...] ls
        [zk:...] set /my_app /newdata
        [zk:...] ls
        [zk:...] delete /my_app
        [zk:...] ls