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How hard is it to move Docker containers to another system?
(lemmy.dbzer0.com)
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Yes that's correct. And containers are not really portable in the way you described. They do have a mini OS in them but the state is not saved when they are "offline". So you can think of it as more of a template, called an image. You can save the image to a file, and move that to a new pc and load that back into Docker, but that's usually unnecessary. As long as you have Internet, you just need to know the name of the image and Docker will just download it if it doesn't already have it. For most popular programs, you'll find an image for it already created so just follow the instructions on what settings to use for things like volume mounts and environment variables. This configuration of variables can be saved into a Docker Compose file for easy reuse instead of typing really long command line to run your container. This Compose file is all you really need to move to the other PC and it'll just download your image and run everything as before.
Oh, that's even easier than I thought then :)
I've got a great internet connection, so as long as I save the Compose files, I can rebuild the image forever, barring changes to the program in the container then. Much easier :D