Comment on Should I move to Docker?

• Dyskolos@lemmy.zip ⁨11⁩ ⁨months⁩ ago

  But I can’t really tinker IN the docker-image, right? It’s maintained elsewhere and I just get what i got. But with way less tinkering? Do I have control over the amount/percentage of resources a container uses? And could I just freeze a container, move it to another physical server and continue it there? So it would be worth the time to learn everything about docker for my “just” 10 VMs to replace in the long run?

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  • xcjs@programming.dev ⁨11⁩ ⁨months⁩ ago

    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 Docker file
    2. Execute an interactive shell session, example docker exec -it containerName /bin/bash
    3. Replace or expose filesystem resources using host or volume mounts.

    Yes, you 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.

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    • Dyskolos@lemmy.zip ⁨11⁩ ⁨months⁩ ago

      Hm. That doesn’t really sound bad. Thanks man, I guess I will take some time to read into it. Currently on proxmox, but AFAIK it does containers too.

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      • xcjs@programming.dev ⁨11⁩ ⁨months⁩ ago

        It’s really not! I migrated rapidly from orchestrating services with Vagrant and virtual machines to Docker just because of how much more efficient it is.

        Granted, it’s a different tool to learn and takes time, but I feel like the tradeoff was well worth it in my case.

        I also further orchestrate my containers using Ansible, but that’s not entirely necessary for everyone.

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