Zookeeper

This role helps set up a Zookeeper cluster on CentOS/RHEL.

Role Variables

Here are the default variable values for Zookeeper:

zk_maxClientCnxns : 50              # Max client connections
zk_tickTime : 2000                   # Time in milliseconds for tick
zk_initLimit : 10                    # Init limit for the connection
zk_syncLimit : 5                     # Sync limit for the connection
zk_dataDir : /var/lib/zookeeper      # Directory for data storage
zk_data_logDir : /var/lib/zookeeper  # Directory for log data
zk_clientPort : 2181                 # Port for client connections
zk_leaderPort : 2888                 # Port for leader election
zk_electionPort : 3888               # Port for election communication

Example Inventory File

Here’s an example of how to write your inventory file:

zk-1 ansible_ssh_host=192.168.168.201 ansible_ssh_port=22 ansible_ssh_user=centos
zk-2 ansible_ssh_host=192.168.168.202 ansible_ssh_port=22 ansible_ssh_user=centos
zk-3 ansible_ssh_host=192.168.168.203 ansible_ssh_port=22 ansible_ssh_user=centos

[cluster1]
zk-1 zk_myid=1 zk_ip=192.168.168.201
zk-2 zk_myid=2
zk-3 zk_myid=3

[zookeeper:children]
cluster1

If you have only one IP address for a host, you can skip the "zk_ip" variable. If there are multiple IPs, specify which one Zookeeper will use using "zk_ip".

Example Playbook

Here’s an example playbook:

- hosts: zookeeper
  become: true
  roles:
    - { role: /path/to/zookeeper-role }

Zookeeper Usage

You can use Zookeeper with the following commands:

# Open the Zookeeper client
zookeeper-client

# Check the status of the Zookeeper server
zookeeper-server status

Testing

To test the setup, you can use the three hosts defined in the "Vagrantfile" in the root directory. Run the following script:

# ./vagrant.sh

License

MIT