[prev in list] [next in list] [prev in thread] [next in thread] 

List:       lxc-users
Subject:    Re: [lxc-users] /proc/meminfo:Shmem same on containers and host
From:       "Serge E. Hallyn" <serge () hallyn ! com>
Date:       2022-02-06 3:09:48
Message-ID: 20220206030948.GA23832 () mail ! hallyn ! com
[Download RAW message or body]

On Tue, Jan 04, 2022 at 04:17:02AM -0800, Alexis Huxley wrote:
> Hi, inside an LXC container, /proc/meminfo:MemTotal corresponds with the 
> container-specific restrictions, but /proc/meminfo:Shmem is the value from 
> the host that the container runs on.
> 
> Is this a bug or is it meant to be like this?
> 
> The reason I ask is that CheckMK monitors the ratio between the two values 
> and triggers an alert when a threshhold value is exceeded. On the host 
> ('fiori' in the output below) and on containers that genuinely need a lot 
> of  memory then the ratio is always well below the threshold. But on one 
> container ('mandala' in the output), which needs only a little memory, the 
> ratio is high enough to trigger alerts.
> 
> I understand that I can modify the CheckMK's threshold for this host, but 
> before I do that I want to know whether (a) I should do thar or whether (b) 
> I should submit an LXC bug report or whether (c) it's a fixed bug that just 
> hasn't reached the distro I use (though googling didn't show that).
> 
> Any advice please?

Did anyone ever answer this, in another forum?

From what I can see, the shmem reported by lxcfs should be the one which
came from cgroups, so it should not be the system-wide value.

> In case it helps: this is Debian 11 running stock LXC (4.0.6) and stock 
> lxcfs (4.0.7).
> 
> Alexis
> 
> farfalle# *for HOST in fiori orzo armonie gnocchi paccheri mandala rotelle 
> bigoli; do echo "=== $HOST ==="; echo; ssh -n $HOST "egrep 
> '^(Shmem|MemTotal):' /proc/meminfo"; echo; done*
> === fiori ===
> 
> MemTotal:       32121356 kB
> Shmem:            240100 kB
> 
> === orzo ===
> 
> MemTotal:        2097152 kB
> Shmem:            240100 kB
> 
> === armonie ===
> 
> MemTotal:        2097152 kB
> Shmem:            240100 kB
> 
> === gnocchi ===
> 
> MemTotal:        2097152 kB
> Shmem:            240100 kB
> 
> === paccheri ===
> 
> MemTotal:        2097152 kB
> Shmem:            240100 kB
> 
> === mandala ===
> 
> MemTotal:        1048576 kB
> Shmem:            240100 kB
> 
> === rotelle ===
> 
> MemTotal:        4194304 kB
> Shmem:            240100 kB
> 
> === bigoli ===
> 
> MemTotal:        2097152 kB
> Shmem:            240100 kB
> 
> farfalle#
> 
> --
> 
> -- 
> You received this message because you are subscribed to the Google Groups \
> "lxc-users" group. To unsubscribe from this group and stop receiving emails from \
> it, send an email to lxc-users+unsubscribe@lists.linuxcontainers.org. To view this \
> discussion on the web visit \
> https://groups.google.com/a/lists.linuxcontainers.org/d/msgid/lxc-users/c89e4345-d3d0-40ed-83b0-c9abbb5dd910n%40lists.linuxcontainers.org.
> 

-- 
You received this message because you are subscribed to the Google Groups "lxc-users" \
group. To unsubscribe from this group and stop receiving emails from it, send an \
email to lxc-users+unsubscribe@lists.linuxcontainers.org. To view this discussion on \
the web visit https://groups.google.com/a/lists.linuxcontainers.org/d/msgid/lxc-users/20220206030948.GA23832%40mail.hallyn.com.



[prev in list] [next in list] [prev in thread] [next in thread]