Re: [libvirt-users] LXC Memory Limits wont work
On Wed, Aug 01, 2018 at 12:53:58PM +0200, Markus Raps wrote:
Hello,
iam currently trying to run LXC Containers with libvirt
but the memory limit doesn't want to work
in the container i see the full 32GB from the Host OS
iam pretty sure that iam missing a configline in the xml
lxc-template ~ # free -m
total used free shared buff/cache
available
Mem: 32108 626 31396 249 85
31396
Swap: 0 0 0
lxc-template ~ #
The 'free' command reports what is present in the host, which is distinct
from what's made available to the container. This isn't unique to libvirt
LXC containers - in fact any command that is runnning in a cgroup with
memory controller limits applied will see the same behaviour. Apps can't
assume that 'free' reflects the amount of memory that is available to
them. Instead they need to look at cgroups memory controller that they
are placed under (/proc/self/cgroups tells you where)
Regards,
Daniel
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