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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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Am I wrong to assume that docker is perfect for single board computers that relies on low life expectancy drives (microsd)? (self.linux)

submitted 7 months ago* (last edited 7 months ago) by GustavoM to c/[email protected]

14 comments fedilink hide all child comments

Title. Mostly because of two flags: --read-only and --log-driver.

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[–] sir_reginald 11 points 7 months ago* (last edited 7 months ago) (4 children)

honestly, it's not worth it. hard drives are cheap, just plug one via USB 3 and make all the write operations there. that way your little SBC doesn't suffer the performance overhead of using docker.

[–] [email protected] 3 points 7 months ago (3 children)

The point with an external drive is fine (I did that on my RPi as well), but the point with performance overhead due to containers is incorrect. The processes in the container run directly on the host. You even see the processes in ps. They are simply confined using cgroups to be isolated to different degrees.

[–] sir_reginald -1 points 7 months ago (2 children)

docker images have a ton of extra processes from the OS they were built in. Normally a light distro is used to build images, like Alpine Linux. but still, you're executing a lot more processes than if you were installing things natively.

Of course the images does not contain the kernel, but still they contain a lot of extra processes that would be unnecessary if executing natively.

[–] [email protected] 4 points 7 months ago

Containers don't typically have inits, your process is the init - so no extra processes are started for things other than what you care about.

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