docker-compose.yml

networks:
  cassandra:  # docker network where all cassandra nodes will be put in
services:
  cass1:
    image: cassandra:3.11.13   # better to use a specific version, if you want to control upgrades 
    container_name: cass1
    hostname: cass1
    healthcheck:
        test: ["CMD", "cqlsh", "-e", "describe keyspaces" ]
        interval: 5s
        timeout: 5s
        retries: 60
    networks:
      - cassandra
    ports:
      - "9042:9042"  # Expose native binary CQL port for your apps
    volumes:
      - ./data/cass1:/var/lib/cassandra    # This is the volume that will persist data for cass1 node
      - ./etc/cass1:/etc/cassandra   # Use your own config files for full control
    environment: &environment    # Declare and save environments variables into "environment"
        CASSANDRA_SEEDS: "cass1,cass2"    # The first two nodes will be seeds
        CASSANDRA_CLUSTER_NAME: SolarSystem
        CASSANDRA_DC: Mars
        CASSANDRA_RACK: West
        CASSANDRA_ENDPOINT_SNITCH: GossipingPropertyFileSnitch
        CASSANDRA_NUM_TOKENS: 128

  cass2:
    image: cassandra:3.11.13
    container_name: cass2
    hostname: cass2
    healthcheck:
        test: ["CMD", "cqlsh", "-e", "describe keyspaces" ]
        interval: 5s
        timeout: 5s
        retries: 60
    networks:
      - cassandra
    ports:
      - "9043:9042"  # Expose native binary CQL port for your apps
    volumes:
      - ./data/cass2:/var/lib/cassandra    # This is the volume that will persist data for cass2 node
      - ./etc/cass2:/etc/cassandra    # Use your own config files for full control
    environment: *environment    # point to "environment" to use the same environment variables as cass1
    depends_on:
      cass1:    # start cass2 only after cass1 is healthy
        condition: service_healthy

  cass3:
    image: cassandra:3.11.13
    container_name: cass3
    hostname: cass3
    healthcheck:
        test: ["CMD", "cqlsh", "-e", "describe keyspaces" ]
        interval: 5s
        timeout: 5s
        retries: 60
    networks:
      - cassandra
    ports:
      - "9044:9042"  # Expose native binary CQL port for your apps
    volumes:
      - ./data/cass3:/var/lib/cassandra    # This is the volume that will persist data for cass3 node
      - ./etc/cass3:/etc/cassandra    # Use your own config files for full control
    environment: *environment    # point to "environment" to use the same environment variables as cass1
    depends_on:
      cass2:    # start cass3 only after cass1 is healthy
        condition: service_healthy