docker 群 - 第一个 docker-compose.yml

Question

I'm trying to run my first container on docker swarm and have following issue: on swarm node it is looping - starting 1,2,3 seconds and initialising like in a loop,

I don't know if because of my docker-compose this fails - maybe I created wrong yml file.

services:
  app1:
    image: debian:latest
    #    command: sh -c 'apt update'
    #command: sh -c 'apt install ssh -y'
    deploy:
      replicas: 1
        resources:
          limits:
            cpus: '2'
            memory: 2G
          reservations:
            cpus: '2'
            memory: 2G

networks:
  net1:
    driver: overlay

Answer 1

The plain debian image is just going to go to an interactive session, which counts as an exit when nothing is attached.

You need to do something like this to keep a plain linux os image alive as a service:

services:
  my-service:
    image: debian
    command: tail -f /dev/null