[Users] openvz 7> centos 8 container
mailinglist at tikklik.nl
mailinglist at tikklik.nl
Tue Jun 9 15:02:42 MSK 2020
Thanxs for helping me out...
for i in /proc/[0-9]*/ns/mnt; do readlink $i; done | uniq
mnt:[4026531840]
cat /proc/mounts | wc -l
593
Oke soy the problem here was that centos8 is using namesapces and centos 6
not.
I will contact the vendor to see if i can reduse the total of mounts
This mounts are all website log directory, but i dont offer SSH access so
dont need them.
An dit is only slowing down the restarts if needed.
Thanxs
Steffan
-----Oorspronkelijk bericht-----
Van: users-bounces at openvz.org <users-bounces at openvz.org> Namens Konstantin
Khorenko
Verzonden: dinsdag 9 juni 2020 12:32
Aan: OpenVZ users <users at openvz.org>
Onderwerp: Re: [Users] openvz 7> centos 8 container
On 06/09/2020 12:19 PM, mailinglist at tikklik.nl wrote:
> Hello Konstantin,
>
>
> 1: this is a centos 6 container
> lsns is not there
i don't expect namespaces in centos 6 Containers, i think there is only one,
but you can verify it:
# for i in /proc/[0-9]*/ns/mnt; do readlink $i; done | uniq
Just check the number of lines in output.
And how many mounts in CentOS 6 Container?
(Assuming only 1 mount namespace, just cat /proc/mounts | wc -l)
> 2:
> PID: 1, # of mounts: 600, cmdline: init-z
> PID: 707, # of mounts: 1199, cmdline:
> /usr/lib/systemd/systemd-udevd
> PID: 724, # of mounts: 1205, cmdline:
> /usr/sbin/NetworkManager--no-daemon
> PID: 11063, # of mounts: 1201, cmdline:
/usr/sbin/httpd-DFOREGROUND
> PID: 10410, # of mounts: 1203, cmdline:
> /usr/libexec/postfix/master-w
> PID: 1118, # of mounts: 1201, cmdline:
> /usr/libexec/mysqld--basedir=/usr
> PID: 1029, # of mounts: 1201, cmdline: php-fpm: master process
> (/etc/opt/remi/php73/php-fpm.conf)
> PID: 1037, # of mounts: 1201, cmdline: php-fpm: master process
> (/etc/opt/remi/php71/php-fpm.conf)
> PID: 1039, # of mounts: 1201, cmdline: php-fpm: master process
> (/etc/opt/remi/php56/php-fpm.conf)
> PID: 1041, # of mounts: 1202, cmdline: php-fpm: master process
> (/etc/php-fpm.conf)
> Total number of mounts: 28169
He-he, there is a mistake in the script - "Total number of mounts" prints
sum of pids. :) But ok, the real sum of mounts is 10000+.
--
Konstantin
> -----Oorspronkelijk bericht-----
> Van: users-bounces at openvz.org <users-bounces at openvz.org> Namens
> Konstantin Khorenko
> Verzonden: dinsdag 9 juni 2020 10:53
> Aan: OpenVZ users <users at openvz.org>
> Onderwerp: Re: [Users] openvz 7> centos 8 container
>
> On 06/09/2020 09:42 AM, mailinglist at tikklik.nl wrote:
>> Is this on a openvz6 a different setting.
>
> That's strange, the mount limit presents in vz6 as well.
>
> At some point we faced the situation when some Container stop took
> enormous amount of time, we found out that there was a software inside
which "leaked"
> mounts, but this does not matter, it means any "bad guy" can create a
> lot of mounts and start/stop Containers affecting other Containers on
> the same node (global locks taken - namespace_sem, vfsmount_lock).
>
> Thus we've implemented the precaution limit for mounts.
>
> Can you check the total number of mounts on
> 1) vz6 ("old" server running in centos7 Container?) and
> 2) vz7 ("new" server running in centos8 Container?)
>
> # export total=0; for i in `lsns | grep mnt | awk -e '{print $4;}'`;
> do echo -en "PID: $i,\t# of mounts: "; echo -n `cat /proc/$i/mounts |
> wc -l`; echo -en ",\tcmdline: "; cat /proc/$i/cmdline; echo "";
> total=$((total + $i)); done; echo "Total number of mounts: $total"
>
> Thank you.
>
> --
> Konstantin
>
>> The old server is now running on a centos 7 vps
>>
>>
>> -----Oorspronkelijk bericht-----
>> Van: users-bounces at openvz.org <users-bounces at openvz.org> Namens
>> Konstantin Khorenko
>> Verzonden: maandag 8 juni 2020 23:07
>> Aan: OpenVZ users <users at openvz.org>
>> Onderwerp: Re: [Users] openvz 7> centos 8 container
>>
>> On 06/08/2020 09:15 PM, mailinglist at tikklik.nl wrote:
>>> If 4096 is the default
>>> Then i dont get it why this error is there
>>>
>>> Its 'only' 597
>>>
>>> mount | wc -l
>>> 597
>>
>> Most probably you have mount namespaces with more mounts inside.
>>
>>>
>>>
>>> Best regards,
>>>
>>> Steffan
>>> -----Oorspronkelijk bericht-----
>>> Van: users-bounces at openvz.org <users-bounces at openvz.org> Namens
>>> Konstantin Khorenko
>>> Verzonden: maandag 8 juni 2020 17:45
>>> Aan: OpenVZ users <users at openvz.org>
>>> Onderwerp: Re: [Users] openvz 7> centos 8 container
>>>
>>> On 06/08/2020 03:31 PM, mailinglist at tikklik.nl wrote:
>>>> I now see on my node:
>>>>
>>>> kernel: CT#402 reached the limit on mounts.
>>>
>>> You can increase the limit of mounts inside a Container via sysctl
>>> "fs.ve-mount-nr" (4096 by default).
>>>
>>> Warning: stopping of a Container with many mounts inside can take
>>> quite a long time.
>>> Say, if you have 200000 of mounts in a Container, Container stop may
>>> take
>>> ~10 minutes.
>>>
>>> --
>>> Best regards,
>>>
>>> Konstantin Khorenko,
>>> Virtuozzo Linux Kernel Team
>>>
>>>> So think that is the problem.
>>>>
>>>> I see a old toppic onlin
>>> https://forum.openvz.org/index.php?t=rview&th=12902&goto=52002
>>>>
>>>> Any idee if that is the solution that is needed today?
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> *Van:* users-bounces at openvz.org <users-bounces at openvz.org> *Namens
>>> *mailinglist at tikklik.nl
>>>> *Verzonden:* maandag 8 juni 2020 14:17
>>>> *Aan:* 'OpenVZ users' <users at openvz.org>
>>>> *Onderwerp:* [Users] openvz 7> centos 8 container
>>>>
>>>>
>>>>
>>>> Hello,
>>>>
>>>>
>>>>
>>>> If installed a centos 8 op-envz container
>>>>
>>>> It was working, but after migration my data from an older
>>>> container im
>>> keep getting errors like this:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> php71-php-fpm.service: Failed to set up mount namespacing:
>>>> Cannot
>>> allocate memory
>>>>
>>>> php71-php-fpm.service: Failed at step NAMESPACE spawning
>>> /opt/remi/php71/root/usr/sbin/php-fpm: Cannot allocate memory
>>>>
>>>>
>>>>
>>>> php73-php-fpm.service: Failed to set up mount namespacing:
>>>> Cannot
>>> allocate memory
>>>>
>>>> php73-php-fpm.service: Failed at step NAMESPACE spawning
>>> /opt/remi/php73/root/usr/sbin/php-fpm: Cannot allocate memory
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> httpd.service: Failed to set up mount namespacing: Cannot
>>>> allocate
>>> memory
>>>>
>>>> httpd.service: Failed at step NAMESPACE spawning /usr/sbin/httpd:
>>> Cannot allocate memory
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> cat /proc/user_beancounters
>>>>
>>>> Version: 2.5
>>>>
>>>> resource held maxheld
>>> barrier limit failcnt
>>>>
>>>> kmemsize 92078080 121937920
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> lockedpages 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> privvmpages 52155 75857
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> shmpages 659 2636
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> dummy 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> numproc 39 39
>>> 4194304 4194304 0
>>>>
>>>> physpages 97697 111964
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> vmguarpages 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> oomguarpages 97697 111964
>>> 0 0 0
>>>>
>>>> numtcpsock 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> numflock 2 5
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> numpty 0 1
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> numsiginfo 0 57
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> tcpsndbuf 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> tcprcvbuf 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> othersockbuf 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> dgramrcvbuf 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> numothersock 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> dcachesize 51408896 72798208
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> numfile 711 995
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> dummy 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> dummy 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> dummy 0 0
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>> numiptent 8 16
>>> 9223372036854775807 9223372036854775807 0
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> uname -r 3.10.0-1062.12.1.vz7.131.10
>>>>
>>>>
>>>>
>>>> any idees what went wrong and how to repair?
>>>>
>>>>
>>>>
>>>> Thanxs
>>>>
>>>>
>>>> Steffan
>>>>
>>>>
>>>>
>>>>
>>>>
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