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 ?