Does limits.memory require lxcfs in order to work?

LXD
1

I’m a new lxd user. I got started by following the tutorial tied to the on-line demo, then installed lxd on my own machine.

Setting limits.memory for a container had no effect on the memory visible inside that container.

I had to hunt around quite a while before I found these:
Limit on cpus and memory does not work #438
lxc.cgroup.memory.limit_in_bytes has no effect on ubuntu 18.10 #2845
Will Linux/Ubuntu running in an LXC container understand cgroup memory limits?

This seems pretty basic, and it’s a common question. Check out the information callout in this Gentoo wiki page. It is hard to blame the article author for this omission, since I wasn’t able to find any mention of this in the project documentation, either.

Are the memory limits honoured, even if the new memory limit is not shown inside the container?

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The limits will be enforced by the kernel but to have them be visible by userspace tools, you need lxcfs.

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