Installation and deployment of ZooKeeper

Two Zookeeper installation deployment

2.1 Zookeeper installation

• Zookeeper before installation need to install JDK. Configuring environment variables.

• Download: ZooKeeper-3.4.5-cdh5.7.0.tar.gz

• Decompression

  tar -zxvf zookeeper-3.4.5-cdh5.7.0.tar.gz  -C ~/app/

• Unzip into the zookeeper directory to find the conf directory and copy the configuration file and edit

  cp zoo_sample.cfg zoo.cfg 
  vi zoo.cfg

• Add the following in the zoo.cfg

  dataDir=/home/hadoop/app/zookeeper-3.4.5-cdh5.7.0/data
  dataLogDir=/home/hadoop/app/zookeeper-3.4.5-cdh5.7.0/logs

• Once configured, go to the bin directory run

  ./zkServer.sh start

• View the running status

  ./zkServer.sh status 
  
  JMX enabled by default
  Using config: /home/hadoop/app/zookeeper-3.4.5-cdh5.7.0/bin/../conf/zoo.cfg
  Mode: standalone

• Stop running

  ./zkServer.sh stop
  
  Using config: /home/hadoop/app/zookeeper-3.4.5-cdh5.7.0/bin/../conf/zoo.cfg
  Stopping zookeeper ... STOPPED

2.2 zoo.cfg Configuration

• tickTime: time unit for calculating a session timeout, such as: N * tickTime
• initLimit: a cluster, and allow connections from the node to the master node synchronizing connection initialization time, expressed in multiples tickTime
• syncLimit: a cluster, the master node and the Master to send messages between nodes, the request and response time length (heartbeat mechanism).
• dataDir: You must configure
• dataLogDir: log directory, if you do not configure the public will and dataDir
• clientPort: port connection to the server, the default 2181

2.3 Zookeeper main directory structure

• bin Some of the major operational command
• conf store configuration files, which need to be amended is zk.cfg
• contrib: Some additional features
• dist-maven: after mvn compile directory
• docs: Documentation
• lib: need to rely on the jar package
• recipes: Case demo code
• src: Source