dovecot 2.2.36.4 problem with ulimit

[Maciej Milaszewski]

Hi
Thenx replay:

cat /proc/`pidof dovecot`/limits
Limit                     Soft Limit           Hard Limit          
Units    
Max cpu time              unlimited            unlimited           
seconds  
Max file size             unlimited            unlimited           
bytes    
Max data size             unlimited            unlimited           
bytes    
Max stack size            8388608              unlimited           
bytes    
Max core file size        0                    0                   
bytes    
Max resident set          unlimited            unlimited           
bytes    
Max processes             357577               357577              
processes
Max open files            65536                65536               
files    
Max locked memory         65536                65536               
bytes    
Max address space         unlimited            unlimited           
bytes    
Max file locks            unlimited            unlimited           
locks    
Max pending signals       357577               357577              
signals  
Max msgqueue size         819200               819200              
bytes    
Max nice priority         0                    0                   
Max realtime priority     0                    0                   
Max realtime timeout      unlimited            unlimited           
us       

Now I change in systemd
systemctl edit dovecot.service

[Service]
TasksMax=40000
LimitNOFILE=65536
LimitNPROC=357577
LimitNPROCSoft=357577
LimitSIGPENDING=357577
LimitSIGPENDINGSoft=357577
On 16.09.2020 14:17, Urban Loesch wrote:

> Hi,
>
> perhaps this?
>
> > with new debian9:
> > open files                      (-n) 1024
>
> Regards
> Urban
>
>
> Am 16.09.20 um 12:57 schrieb Maciej Milaszewski:
>> Hi
>> Limits:
>>
>> Where all working fine:
>>
>> core file size          (blocks, -c) 0
>> data seg size           (kbytes, -d) unlimited
>> scheduling priority             (-e) 0
>> file size               (blocks, -f) unlimited
>> pending signals                 (-i) 257970
>> max locked memory       (kbytes, -l) 64
>> max memory size         (kbytes, -m) unlimited
>> open files                      (-n) 65536
>> pipe size            (512 bytes, -p) 8
>> POSIX message queues     (bytes, -q) 819200
>> real-time priority              (-r) 0
>> stack size              (kbytes, -s) 8192
>> cpu time               (seconds, -t) unlimited
>> max user processes              (-u) 257970
>> virtual memory          (kbytes, -v) unlimited
>> file locks                      (-x) unlimited
>>
>>
>> with new debian9:
>>
>> core file size          (blocks, -c) 0
>> data seg size           (kbytes, -d) unlimited
>> scheduling priority             (-e) 0
>> file size               (blocks, -f) unlimited
>> pending signals                 (-i) 257577
>> max locked memory       (kbytes, -l) 64
>> max memory size         (kbytes, -m) unlimited
>> open files                      (-n) 1024
>> pipe size            (512 bytes, -p) 8
>> POSIX message queues     (bytes, -q) 819200
>> real-time priority              (-r) 0
>> stack size              (kbytes, -s) 8192
>> cpu time               (seconds, -t) unlimited
>> max user processes              (-u) 257577
>> virtual memory          (kbytes, -v) unlimited
>> file locks                      (-x) unlimited
>>
>>
>> maby systemd "something has changed"
>>
>> and add:
>>
>> echo "kernel.pid_max = 50000" >> /etc/sysctl.conf
>> sysctl -p
>> systemctl edit dovecot.service
>>
>> [Service]
>> TasksMax=40000
>> systemctl daemon-reload
>> systemctl restart dovecot.service
>>
>> cat /sys/fs/cgroup/pids/system.slice/dovecot.service/pids.max
>>
>>
>> Any idea ?
>>
>> On 16.09.2020 09:45, Maciej Milaszewski wrote:
>>> Hi
>>> I update os from debian8 to debian9
>>>
>>> # 2.2.36.4 (baf9232c1): /etc/dovecot/dovecot.conf
>>> # Pigeonhole version 0.4.24.2 (aaba65b7)
>>> # OS: Linux 4.9.0-13-amd64 x86_64 Debian 9.13
>>>
>>> All works fine but sometimes I get:
>>>
>>> Sep 16 09:17:00 dovecot4 dovecot: master: Error: service(pop3): fork()
>>> failed: Resource temporarily unavailable (ulimit -u 257577 reached?)
>>> Sep 16 09:17:00 dovecot4 dovecot: master: Error: service(imap): fork()
>>> failed: Resource temporarily unavailable (ulimit -u 257577 reached?)
>>> Sep 16 09:17:00 dovecot4 dovecot: master: Error: service(doveadm):
>>> fork() failed: Resource temporarily unavailable (ulimit -u 257577
>>> reached?)
>>> Sep 16 09:17:02 dovecot4 dovecot: master: Error: service(doveadm):
>>> fork() failed: Resource temporarily unavailable (ulimit -u 257577
>>> reached?)
>>> Sep 16 09:17:02 dovecot4 dovecot: master: Error: service(pop3): fork()
>>> failed: Resource temporarily unavailable (ulimit -u 257577 reached?)
>>> Sep 16 09:17:02 dovecot4 dovecot: master: Error: service(imap): fork()
>>> failed: Resource temporarily unavailable (ulimit -u 257577 reached?)
>>> Sep 16 09:17:04 dovecot4 dovecot: master: Error: service(imap): fork()
>>> failed: Resource temporarily unavailable (ulimit -u 257577 reached?)
>>>
>>> Other dovecot is debian8 and problem not exists - any idea ?