Why can’t I use Docker CMD multiple times to run multiple services?

by

You are right, the second Dockerfile will overwrite the CMD command of the first one. Docker will always run a single command, not more. So at the end of your Dockerfile, you can specify one command to run. Not more.

But you can execute both commands in one line:

FROM centos+ssh
EXPOSE 22
EXPOSE 4149
CMD service sshd start && /opt/mq/sbin/rabbitmq-server start

What you could also do to make your Dockerfile a little bit cleaner, you could put your CMD commands to an extra file:

FROM centos+ssh
EXPOSE 22
EXPOSE 4149
CMD sh /home/centos/all_your_commands.sh

And a file like this:

service sshd start &
/opt/mq/sbin/rabbitmq-server start

More Related Contents:

  1. How to copy files from host to Docker container?
  2. Why docker container exits immediately
  3. Add a volume to Docker, but exclude a sub-folder
  4. How to change the docker image installation directory?
  5. Locating data volumes in Docker Desktop (Windows)
  6. Docker Compose – Share named volume between multiple containers
  7. How to remove old Docker containers
  8. How to keep Docker container running after starting services?
  9. Restrict Internet Access – Docker Container
  10. Kubernetes how to make Deployment to update image
  11. Docker-Compose persistent data MySQL
  12. How to run kubectl commands inside a container?
  13. Can I alias a subcommand? (shortening the output of `docker ps`)
  14. Disable cache for specific RUN commands
  15. Am I trying to connect to a TLS-enabled daemon without TLS?
  16. Keras with TensorFlow backend not using GPU
  17. what is the point of using pm2 and docker together?
  18. Docker: Add a restart policy to a container that was already created
  19. How to set a path on host for a named volume in docker-compose.yml
  20. How can I use a local file on container?
  21. Port forwarding in docker-machine?
  22. Docker expose all ports or range of ports from 7000 to 8000
  23. write in shared volumes docker
  24. How to port data-only volumes from one host to another?
  25. What is the alternative to condition form of depends_on in docker-compose Version 3?
  26. How to execute a script when I terminate a docker container
  27. Add Insecure Registry to Docker
  28. How to get remote access to a private docker-registry?
  29. Can I specify host directory to mount from Dockerfile
  30. Multiple Docker containers and Celery

Leave a Comment