dovecot 2.2.36.4 problem with ulimit
Maciej Milaszewski
maciej.milaszewski at iq.pl
Wed Sep 16 13:57:10 EEST 2020
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 ?
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