CockroachDB 4 clusters

docker-compose.yml

version: '3.7'
services:
  cockroach1:
    image: cockroachdb/cockroach:v2.1.6 
    container_name: sample-cockroach-1
    command: start --insecure
    networks:
      sample:
        aliases:
          - sample-cockroach-1
    volumes:
      - ./docker/var/cockroach/data1:/cockroach/cockroach-data
    ports:
      - "26257:26257"
      - "8080:8080"
  cockroach2:
    image: cockroachdb/cockroach:v2.1.6 
    container_name: sample-cockroach-2
    depends_on:
      - cockroach1
    command: start --insecure --join=sample-cockroach-1
    healthcheck:
      test: ["CMD-SHELL", "curl -sL http://localhost:8080/health || exit 1"]
      interval: 60s
      timeout: 5s
      retries: 3
      start_period: 30s
    networks:
      sample:
        aliases:
          - sample-cockroach-2
    volumes:
      - ./docker/var/cockroach/data2:/cockroach/cockroach-data
  cockroach3:
    image: cockroachdb/cockroach:v2.1.6 
    container_name: sample-cockroach-3
    depends_on:
      - cockroach1
    command: start --insecure --join=sample-cockroach-1
    healthcheck:
      test: ["CMD-SHELL", "curl -sL http://localhost:8080/health || exit 1"]
      interval: 60s
      timeout: 5s
      retries: 3
      start_period: 30s
    networks:
      sample:
        aliases:
          - sample-cockroach-3
    volumes:
      - ./docker/var/cockroach/data3:/cockroach/cockroach-data
  cockroach4:
    image: cockroachdb/cockroach:v2.1.6 
    container_name: sample-cockroach-4
    depends_on:
      - cockroach1
    command: start --insecure --join=sample-cockroach-1
    healthcheck:
      test: ["CMD-SHELL", "curl -sL http://localhost:8080/health || exit 1"]
      interval: 60s
      timeout: 5s
      retries: 3
      start_period: 30s
    networks:
      sample:
        aliases:
          - sample-cockroach-4
    volumes:
      - ./docker/var/cockroach/data4:/cockroach/cockroach-data
networks:
  sample:

$ tree -L 4
.
├── docker
│   └── var
│       └── cockroach
│           ├── data1
│           ├── data2
│           ├── data3
│           └── data4
└── docker-compose.yml