Apache Cassandra

Supported Cassandra cluster is composed of a single seed node and arbitrary many worker nodes that all initially connect to seed node.

Note

In the future, the limitation of supporting only one seed per cluster will be lifted and single point of failure at the start will be eliminated.

node_templates:

  ${CASSANDRA}_seed_firewall:
    type: dice.firewall_rules.cassandra.Seed

  ${CASSANDRA}_seed_vm:
    type: dice.hosts.ubuntu.${HOST_SIZE}
    relationships:
      - type: dice.relationships.ProtectedBy
        target: ${CASSANDRA}_seed_firewall

  ${CASSANDRA}_seed:
    type: dice.components.cassandra.Seed
    properties:
      configuration: ${CASSANDRA_CONFIGURATION}
    relationships:
      - type: dice.relationships.ContainedIn
        target: ${CASSANDRA}_seed_vm

  ${CASSANDRA}_worker_firewall:
    type: dice.firewall_rules.cassandra.Worker

  ${CASSANDRA}_worker_vm:
    type: dice.hosts.ubuntu.${HOST_SIZE}
    instances:
      deploy: ${CASSANDRA_INSTANCE_COUNT}
    relationships:
      - type: dice.relationships.ProtectedBy
        target: ${CASSANDRA}_worker_firewall

  ${CASSANDRA}_worker:
    type: dice.components.cassandra.Worker
    properties:
      configuration: ${CASSANDRA_CONFIGURATION}
    relationships:
      - type: dice.relationships.ContainedIn
        target: ${CASSANDRA}_seed_vm
      - type: dice.relationships.cassandra.ConnectedToSeed
        target: ${CASSANDRA}_seed

Template variables

CASSANDRA

The name of the Cassandra cluster, usually set to cassandra.

CASSANDRA_CONFIGURATION

A dictionary containing the configuration of the ${CASSANDRA} cluster. If no special configuration is needed, use {} here.

CASSANDRA_INSTANCE_COUNT

Number of Cassandra workers that we would like to deploy as part of this cluster.

HOST_SIZE

Size of the host virtual machine. Available values are Small, Medium and Large.