[Lxc-users] total RAM limit

[Stéphane Graber]

On 01/11/2013 01:17 PM, Gary Ballantyne wrote:
> Hello All
> 
> I understand that I can limit the RAM of a single container via 
> lxc.cgroup.memory.limit_in_bytes. But, is there a way to limit the total
> RAM available to all containers (without limiting each individually)?
> 
> E.g., say we have 4G available. Rather than specifying a maximum number
> of containers (16 with 250M say), I'd like to allocate 4G to all
> containers, without a hard upper limit on the number of containers (16
> in this case), and let the performance degrade gradually as more
> containers are added. (I'm anticipating being able to use many more
> containers this way, since our container's RAM usage is likely to be
> bursty).

You can, but not through lxc configuration.

LXC uses the "lxc" directory in the cgroup hierarchy, so that your
container is typically at:
lxc/<container name>/

Manually changing the keys in the lxc directory will set a shared quota
for everything under it.

As a concrete example, on my laptop, the memory cgroup is mounted at:
/sys/fs/cgroup/memory/

And individual container cgroups are at:
/sys/fs/cgroup/memory/lxc/<container name>

So setting /sys/fs/cgroup/memory/lxc/memory.limit_in_bytes would do what
you want.

> Many thanks
> 
> Gary
> 
> 
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-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com

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