[Users] Can't create directory /sys/fs/cgroup/memory/machine.slice/ Cannot allocate memory
Joe Dougherty
joe at securedragon.net
Thu Jan 28 12:43:57 MSK 2021
I checked that, doesn't appear to be the case.
*# pwd*
*/sys/fs/cgroup/memory*
*# cat *limit_in_bytes*
*9223372036854771712*
*9223372036854767616*
*2251799813685247*
*2251799813685247*
*9223372036854771712*
*9223372036854771712*
*9223372036854771712*
*# cat *failcnt*
*0*
*0*
*0*
*0*
*0*
# pwd
/sys/fs/cgroup/memory/machine.slice
*# cat *limit_in_bytes*
*9223372036854771712*
*9223372036854767616*
*9223372036854771712*
*9223372036854771712*
*9223372036854771712*
*9223372036854771712*
*9223372036854771712*
*# cat *failcnt*
*0*
*0*
*0*
*0*
*0*
On Thu, Jan 28, 2021 at 2:47 AM Konstantin Khorenko <khorenko at virtuozzo.com>
wrote:
> Hi Joe,
>
> i'd suggest to check memory limits for root and "machine.slice" memory
> cgroups
>
> /sys/fs/cgroup/memory/*limit_in_bytes
> /sys/fs/cgroup/memory/machine.slice/*limit_in_bytes
>
> All of them should be unlimited.
>
> If not - search who limit them.
>
> --
> Best regards,
>
> Konstantin Khorenko,
> Virtuozzo Linux Kernel Team
>
> On 01/27/2021 10:28 PM, Joe Dougherty wrote:
>
> I'm running into an issue on only 1 of my OpenVZ 7 nodes where it's unable
> to create a directory on /sys/fs/cgroup/memory/machine.slice due to "Cannot
> allocate memory" whenever I try to start a new container or restart and
> existing one. I've been trying to research this but I'm unable to find any
> concrete info on what could cause this. It appears to be memory related
> because sometimes if I issue "echo 1 /proc/sys/vm/drop_caches" it allows me
> to start a container (this only works sometimes) but my RAM usage is
> extremely low with no swapping (swappiness even set to 0 for testing).
> Thank you in advance for your help.
>
>
> Example:
> *# vzctl start 9499*
> *Starting Container ...*
> *Mount image: /vz/private/9499/root.hdd*
> *Container is mounted*
> *Can't create directory /sys/fs/cgroup/memory/machine.slice/9499: Cannot
> allocate memory*
> *Unmount image: /vz/private/9499/root.hdd (190)*
> *Container is unmounted*
> *Failed to start the Container*
>
>
> Node Info:
> *Uptime: 10 days*
> *OS: Virtuozzo 7.0.15*
> *Kernel: 3.10.0-1127.18.2.vz7.163.46 GNU/Linux*
> *System Load: 3.1*
> */vz Usage: 56% of 37T*
> *Swap Usage: 0%*
> *RAM Free: 84% of 94.2GB*
>
> *# free -m*
> * total used free shared
> buff/cache available*
> *Mem: 96502 14259 49940 413 32303
> 80990*
> *Swap: 32767 93 32674*
>
>
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>
>
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--
*-Joe Dougherty*
*Chief Operating Officer*
*Secure Dragon LLC *
*www.SecureDragon.net <http://www.SecureDragon.net>*
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