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this post was submitted on 05 Sep 2023
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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That's my bad, I tend to kinda lump cloud, VMs, and containers together and sometimes use catchall phrases. I know they're all different and I should clarify.
No worries. For easy reference:
Cloud: someone else's computer
VM: walled-off compartment of your PC
container: not-so-walled-off compartment of your PC.
Perfect! thank you. And I always thought containers and VMs were opposite, like a container is more ingrained into the distro. TIL!
So, with a VM everything inside it runs on a completely separate software stack completely different OS, Kernel, etc. It's very much pretending to be another machine.
With a container, it's running from the same kernel as the host, and the compartmentalisation is handled by the kernel basically. By default they can't really see each other, but the kernel can see both.
Do the distros remember and keep everything the same way though? like do they remember all your settings and apps and what not? Idk why, but im under the impression that they wipe each time. probably way wrong lol
Everything is saved like on a "real" system.
Well perfect! Idk why I was under the impression that each time you spin a VM, its like a temporary session...
So, docker images don't save their changes by default. The idea being that the image is supposed to be a reliable image that can fix any snafus with a simple revert of the system disk.
It's really easy to save changes though, just use docker commit . You can also mount host folders to folders in the guest, where they are as changeable as anything on your host.
Ahh I see. I definitely do want to learn docker but I think that may be too tricky for me right now. I do tend to get sidetracked and go off into little experiments though and end up not getting anything done lol