this post was submitted on 13 Dec 2023
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Should I move to Docker? (lemmy.ca)
submitted 2 years ago by GreatBlueHeron@lemmy.ca to c/selfhosted@lemmy.world
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I'm a retired Unix admin. It was my job from the early '90s until the mid '10s. I've kept somewhat current ever since by running various machines at home. So far I've managed to avoid using Docker at home even though I have a decent understanding of how it works - I stopped being a sysadmin in the mid '10s, I still worked for a technology company and did plenty of "interesting" reading and training.

It seems that more and more stuff that I want to run at home is being delivered as Docker-first and I have to really go out of my way to find a non-Docker install.

I'm thinking it's no longer a fad and I should invest some time getting comfortable with it?

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[–] xcjs@programming.dev 2 points 2 years ago* (last edited 2 years ago) (1 children)

You can tinker in the image in a variety of ways, but make sure to preserve your state outside the container in some way:

  1. Extend the image you want to use with a custom Dockerfile
  2. Execute an interactive shell session, for example docker exec -it containerName /bin/bash
  3. Replace or expose filesystem resources using host or volume mounts.

Yes, you can set a variety of resources constraints, including but not limited to processor and memory utilization.

There's no reason to "freeze" a container, but if your state is in a host or volume mount, destroy the container, migrate your data, and resume it with a run command or docker-compose file. Different terminology and concept, but same result.

It may be worth it if you want to free up overhead used by virtual machines on your host, store your state more centrally, and/or represent your infrastructure as a docker-compose file or set of docker-compose files.