[Users] Can't create directory /sys/fs/cgroup/memory/machine.slice/ Cannot allocate memory

[Konstantin Khorenko]

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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