Initialitaion inside yaml file with a long bash command .... example from min.io

docker-compose.yml

    createbuckets:
        image: minio/mc
        networks:
            - backplane
        depends_on:
            - minio
        entrypoint: >
            /bin/sh -c "
            while ! nc -z minio 9000; do echo 'Wait minio to startup...' && sleep 0.1; done;
            sleep 5;
            /usr/bin/mc config host add minio http://minio:9000 xxxxx
            /usr/bin/mc mb minio/opencity-demo-bucket;
            /usr/bin/mc policy set public minio/opencity-demo-bucket;
            exit 0;
            "

gistfile1.txt

version: "3.7"

x-loki: &logging-loki
    logging:
      driver: loki
      options:
        loki-url: "http://172.31.1.125:3100/loki/api/v1/push"
        loki-retries: "5"
        loki-batch-size: "400"

x-logging:
  &default-logging
  options:
    max-size: '12m'
    max-file: '5'
  driver: json-file

# usabile cosi':
#services:
#  web:
#    logging: *default-logging

x-volumes:
  &default-volume
  driver: foobar-storage

volumes:
  vol1: *default-volume
  vol2:
    << : *default-volume
    name: volume02
  vol3:
    << : *default-volume
    driver: default
    name: volume-local


networks:
  internal:
  traefik:
    external: true
    name: traefik

configs:
  configfile:
    file: ./config/whoami/file.yml
    name: configfile-v1

configs:
  cert.pem:
    file: ./config/whoami/cert.pem

services:
  whoami:
    image: containous/whoami
    #command: sleep 3600
    #entrypoint:
    #init: true											# Run an init inside the container
    																# that forwards signals and reaps processes
    stop_grace_period: 1m30s				# default: 10s
    stop_signal: SIGUSR1						# default: SIGTERM
    sysctls:
  		net.core.somaxconn: 1024
  		net.ipv4.tcp_syncookies: 0
    <<: *logging-loki
    volumes:
      - /srv:/data
    networks:
      - traefik
    # alternative way for networks
    #  internal:
    #    aliases:
    #      - alias1
    #      - alias2
    extra_hosts:
      - "somehost:162.242.195.82"
    environment:
      SHOW: 'true'
    configs:
    secrets:
    	- source: cert.pem
        target: /etc/certs/cert.pem		# default: /run/secrets/$source
        uid: '33'
        gid: '33'
        mode: 0440
    deploy:
      replicas: 2
      resources:
        reservations:
          cpus: '0.1'
          memory: 32M
      update_config:
        order: start-first						# default: stop-first
        parallelism: 1
        delay: 10s
        failure_action: rollback			# default: pause
        monitor: 2s
      rollback_config:
        order: start-first     				# default: stop-first
        parallelism: 1
        delay: 10s
        monitor: 2s
      restart_policy:
        condition: on-failure
        delay: 5s
        max_attempts: 10
        window: 120s
      placement:
        constraints: [node.labels.type == stateless]
      labels:
        traefik.docker.network: "traefik"
        traefik.enable: 'true'
        traefik.http.routers.whoami.entrypoints: websecure
        traefik.http.routers.whoami-https.rule: 'Host(`whoami.boat.opencontent.io`)'
        traefik.http.routers.whoami-https.tls: 'true'
        traefik.http.routers.whoami-https.tls.certresolver: 'mydnschallenge'
        traefik.http.routers.whoami-https.middlewares: 'goodheaders'
        traefik.http.routers.whoami-http.entrypoints: web
        traefik.http.routers.whoami-http.rule: 'Host(`whoami.boat.opencontent.io`)'
        traefik.http.routers.whoami-http.middlewares: gotossl
        traefik.http.services.whoami.loadbalancer.server.port: 80
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost"]
      # test: curl -f https://localhost || exit 1									# equivalent 
      # test: ["CMD-SHELL", "curl -f http://localhost || exit 1"]	# equivalent
      interval: 1m30s
      timeout: 10s
      retries: 3
      start_period: 40s
      


	memcached:
  	image: bitnami/memcached:1.6.6
    environments:
    	MEMCACHED_THREADS: 4
      MEMCACHED_MAX_CONNECTIONS: 1000
      MEMCACHED_CACHE_SIZE: 128