A sample (from featmap) docker service definition with healthcheck

docker-compose-postgres-with-healt-check.txt

# link https://gist.githubusercontent.com/beci/e968d16363e71c77a1aa0495cdde5161/raw/c6a39779c8a951283f38af0d390484f6bb2ee837/docker-compose-postgres-with-healt-check.txt
#
    postgres:
        image: postgres:11-alpine
        restart: always
        volumes:
            - ${PWD}/data:/var/lib/postgresql/data
        environment:
            POSTGRES_DB: ${FEATMAP_DB}
            POSTGRES_USER: ${FEATMAP_DB_USER}
            POSTGRES_PASSWORD: ${FEATMAP_DB_PASSWORD}
        healthcheck:
            test: [ "CMD-SHELL", "pg_isready -U ${FEATMAP_DB_USER}" ]
            interval: 10s
            timeout: 5s
            retries: 5

And on the depending service:

        depends_on:
            postgres:
                condition: service_healthy