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Role to install cassandra 3.11.x

Prerequisites

  • Java 1.8

Installation

Role can be found on galaxy - https://galaxy.ansible.com/suyash248/ansible_role_cassandra

$ ansible-galaxy install suyash248.ansible_role_cassandra

Settings/Variables

Following variables can be overwritten by passing extra-vars option, or in a template created using ansible tower

---
cluster_name: 'Cassandra cluster'
endpoint_snitch: GossipingPropertyFileSnitch

Other configuration can also be specified here. please check templates for that.

Inventory/hosts

[cassandra_hosts]
cassandra1 ansible_host=116.203.142.1 ansible_connection=ssh private_ip=116.203.142.1 public_ip=116.203.142.1 dc=dc1 rack=rack1 seed=true
cassandra2 ansible_host=116.203.142.2 ansible_connection=ssh private_ip=116.203.142.2 public_ip=116.203.142.2 dc=dc1 rack=rack1 seed=true
cassandra3 ansible_host=116.203.142.3 ansible_connection=ssh private_ip=116.203.142.3 public_ip=116.203.142.3 dc=dc1 rack=rack2 seed=false

cassandra4 ansible_host=116.203.142.4 ansible_connection=ssh private_ip=116.203.142.4 public_ip=116.203.142.4 dc=dc2 rack=rack1 seed=true
cassandra5 ansible_host=116.203.142.5 ansible_connection=ssh private_ip=116.203.142.5 public_ip=116.203.142.5 dc=dc2 rack=rack1 seed=true
cassandra6 ansible_host=116.203.142.6 ansible_connection=ssh private_ip=116.203.142.6 public_ip=116.203.142.6 dc=dc2 rack=rack2 seed=false

Playbook

Sample playbook can be found in cassandra_3/tests directory. To install kafka along with all it's dependencies, use test.yml playbook.

Note

After installation, please check the service status.

  • You can start Cassandra using the service. However, normally the service will start automatically. For this reason be sure to stop it if you need to make any configuration changes.
sudo service cassandra start
  • Verify that Cassandra is running by invoking nodetool status from the command line.
  • The default location of configuration files is /etc/cassandra.
  • The default location of log and data directories is /var/log/cassandra/ and /var/lib/cassandra.
  • Start-up options (heap size, etc) can be configured in /etc/default/cassandra.

Run

$ cd roles/cassandra_3/tests
$ ansible-playbook -i inventory test.yml

To run it in local, use [local] hosts group from inventory file, and change hosts variable in test.yml to - hosts: local

Then run the playbook as -

ansible-playbook -i inventory --connection=local test.yml -K

References

  • Download & Install -

https://cassandra.apache.org/download/

  • Single DC setup -

https://docs.datastax.com/en/ddac/doc/datastax_enterprise/production/DDACsingleDCperWorkloadType.html

  • Multi DC setup -

https://docs.datastax.com/en/ddac/doc/datastax_enterprise/production/DDACmultiDCperWorkloadType.html