version: "2"
services:
  never:
    image: busybox
    restart: "no"
  always:
    image: busybox
    restart: always
  on-failure:
    image: busybox
    restart: on-failure
  on-failure-5:
    image: busybox
    restart: "on-failure:5"
  restart-null:
    image: busybox
    restart: ""