I need docker instance to NOT utilize the host swap

Question

My server build uses a lot of swap per container and I am told that docker uses the host swap for instances. My host ssd is only 256gb and is only intended to run the OS. I have setup a zfs pool (9 Tb and growing...) for docker and wanted it to use a portion of it for swap since each instance needs 768k of swap and we plan on running 4k instances.

How can I configure docker to utilize some kind of custom zpool swap dedicated space?

Please provide enough code so others can better understand or reproduce the problem. — Community
– Community Bot, Commented Apr 24, 2022 at 13:27

Bguess · Accepted Answer · 2022-04-24 05:48:42Z

0

Why don't you simply disable the swap?

Identify configured swap devices and files with cat /proc/swaps.
Turn off all swap devices and files with swapoff -a.
Remove any matching reference found in /etc/fstab.
Optional: Destroy any swap devices or files found in step 1 to prevent their reuse. Due to your concerns about leaking sensitive information, you may wish to consider performing some sort of secure wipe. man swapoff

(from here https://serverfault.com/questions/684771/best-way-to-disable-swap-in-linux)

answered Apr 24, 2022 at 5:48

Bguess

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domoarigato Over a year ago

I imagine the OP would like other processes to use swap, just not those running under docker.

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