memory limit on ubuntu 12.04

[matthewmueller]

When I try to set a memory limit on ubuntu 12.04, I keep getting this message:

WARNING: Your kernel does not support memory swap capabilities. Limitation discarded.

Are memory limits supported on 12.04?

---

I just upgraded and rebooted the kernel. Here's that information:

Linux version 3.8.0-30-generic (buildd@allspice) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #44~precise1-Ubuntu SMP Fri Aug 23 18:32:41 UTC 2013

Finally I'm running, docker 0.6.1.

[jpetazzo]

You need a special boot option to enable memory and swap accounting on Debian/Ubuntu kernels.

This is detailed in the Kernel Requirements documentation page.

Let us know if that works for you!

[crosbymichael]

@matthewmueller Were you able to enable the feature?

[matthewmueller]

Hey thanks for the help. I've been on ubuntu 13.04 lately, so this hasn't been a problem. Let me try on my 12.04 VM tonight.

On Sep 13, 2013, at 10:26 AM, Michael Crosby notifications@github.com wrote:

@matthewmueller Were you able to enable the feature?

—
Reply to this email directly or view it on GitHub.

[judeKim]

I also have this problem on my ubuntu 12.04(LTS). kernel version is

3.8.0-30-generic #44~precise1-Ubuntu SMP

I had applied configuration for grub( Kernel Requirements ) but It was not work.

[unclejack]

The required steps to take to enable memory swap limits are documented here: Kernel requirements.

If you're still running into this issue, please comment on this issue and I will open it again. I'm closing it now.

[ghost]

observation.... even after you follow the kernel requirements steps, lxc-checkconfig will still show you

Cgroup memory controller: missing

however if you dig at the cgroup level it does appear the mem/swap accounting is working.

root@dockerbm1:/sys/fs/cgroup/memory# cat ./memory.memsw.limit_in_bytes
9223372036854775807

before applying the kernel requirement steps (update /etc/default/grub, update-grub, reboot) I was getting an error about unsupported operation when catting swap related controls.

maybe the missing controller output is an issue in the lxc-checkconfig command.

[nanobeep]

The link has changed for the "Kernel requirements" and is now: http://docs.docker.io/en/latest/installation/ubuntulinux/#memory-and-swap-accounting

(The old link in the previous comments above gives a 404 error currently)

For an example implementation, see Phusion's Open Vagrant Boxes: https://github.com/phusion/open-vagrant-boxes/blob/master/definitions/ubuntu-12.04.3-amd64-vbox/memory_swap_accounting.sh