docker-compose.yml

version: '2'
services:
  cassandra-1:
    image: cassandra
    container_name: cassandra-1
    environment:
      CASSANDRA_BROADCAST_ADDRESS: "cassandra-1"
    ports:
    - 7000
    volumes:
    - "cassandra1:/var/lib/cassandra"
    restart: always
  cassandra-2:
    image: cassandra
    container_name: cassandra-2
    environment:
      CASSANDRA_BROADCAST_ADDRESS: "cassandra-2"
      CASSANDRA_SEEDS: "cassandra-1"
    ports:
    - 7000
    depends_on:
      - cassandra-1
    volumes:
    - "cassandra2:/var/lib/cassandra"
    restart: always
  cassandra-3:
    image: cassandra
    container_name: cassandra-3
    environment:
      CASSANDRA_BROADCAST_ADDRESS: "cassandra-3"
      CASSANDRA_SEEDS: "cassandra-1"
    ports:
    - 7000
    depends_on:
      - cassandra-2
    volumes:
    - "cassandra3:/var/lib/cassandra"
    restart: always

volumes:
  cassandra1:
    external:
        name: testvol1
  cassandra2:
    external:
        name: testvol2
  cassandra3:
    external:
        name: testvol3

networks:
  default:
    external:
       name: overlay-net