Zookeeper Quick-Start on Gnu/Linux Easy Guide

GNU/Linux Zookeeper Get Started Guide

How to Getting Started with Apache Zookeeper in GNU/Linux Systems.

And ZooKeeper for Linux allows distributed Processes to coordinate with each other through a shared hierarchal Namespace which is organized similarly to a standard File System.

The Name Space consists of Data Registers – called Znodes, in ZooKeeper parlance – and these are similar to Files & Directories.

Unlike a typical File System, which is designed for storage, ZooKeeper Data is kept In-memory, which means ZooKeeper can acheive High Throughput and Low Latency numbers.

1. 1. Installing ZooKeeper

   Install Apache ZooKeeper on your Linux distro

   ZooKeeper Setup Guide

   GNU/Linux ZooKeeper Setup Guide

2. 2. Creating Data Directory

   Make ZooKeeper’s data directory at:

   /var/lib/zookeeper

   sudo mkdir -p /var/lib/zookeeper

3. 3. Configuring ZooKeeper

   Change into the ZooKeeper install folder:

   cd /opt/zookeeper

   Edit the configuration file:

   sudo nano conf/zoo.cfg

   Then append the following settings:

   tickTime=2000
   dataDir=/var/lib/zookeeper
   clientPort=2181

   tickTime is the heartbeat interval (ms); session timeout ≥ 2 × tickTime. Save and exit (Ctrl+X, Y).

4. 4. Starting the Server

   Start the ZooKeeper service:

   sudo /opt/zookeeper/bin/zkServer.sh start

5. 5. Connecting with the CLI

   Launch the ZooKeeper command-line client:

   /opt/zookeeper/bin/zkCli.sh -server 127.0.0.1:2181

   You should see a prompt like:

   [zkshell: 0]

6. 6. Exploring ZooKeeper

   List available commands:

   help

   Create a new znode named “zk_node” with data “my_data”:

   create /zk_node my_data

   List children of the root znode:

   ls /

   Read data from the znode:

   get /zk_node

   Update the znode’s data:

   set /zk_node hello

   Delete the znode:

   delete /zk_node

7. 7. Further Reading

   Explore the ZooKeeper API in depth:

   ZooKeeper Programmer’s Guide

   ZooKeeper Official Docs