memory.max = max annoyance :)

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sava1e

Member
Sep 7, 2023
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I am proxmox 9.0.11 / 6.14.11-4-pve kernel.
When I create a LXC container the cgroups (v2) is actaully working inside the lxc guest. Except there is one annoyance:
cat /sys/fs/cgroup/memory.max always returns 'max', while other info does work. I.e. /sys/fs/cgroup/memory.current gives the current amount of RAM used in the LXC container.
Some .net software I run actually use this /sys/fs/cgroup/memory.max to know how many RAM can be used. In this case the software crashes after a while as I do set a memory limit, but this isn't respected by the .net software.

I found this as well:
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Thread 'LXC - Get memory estimate inside container'

We have a few LXCs (Proxmox 7.2-11) that have memory restrictions set using the normal method available in the Proxmox console. Generally things work great but there is one application we run in the containers that keep consuming memory until the container hits the limit and the OOM killer tries to free some.

We figured out that the application is overestimating the available memory by using the total host memory instead of the container memory. The host has 768GB and the containers have 2GB, so it is a big difference. Inside the containers some utilities (free &...
 
Have you tried gathering the required value from /proc/meminfo?
There are MemTotal, MemFree and MemAvailable properties available.
 
fba said:
Have you tried gathering the required value from /proc/meminfo?
There are MemTotal, MemFree and MemAvailable properties available.
Click to expand...

For my own scripts / software that works, but for some software it's out of my control... It would be nice if the '/sys/fs/cgroup/memory.max' would give the configured LXC memory value imo.
 
There are different values and they all have different meanings depending on a variety of configurations. Your software should allow you to configure max memory, don't depend on auto-discovery as it does not take into account things like ballooning, containers, other applications etc.
 
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