Issue Dovecot stop restarts many times every day

[MariuszB]

Server operating system version

AlmaLinux 8.10 (Cerulean Leopard)

Plesk version and microupdate number

18.0.72 #3

Every day I receive alerts about imap server problem. Dovecot stops work for 2-3 minutes. In logs I have something like this:

imap-login: Fatal: Error reading configuration: read(/var/run/dovecot/config) failed: read(size=8192) failed: Interrupted system call - Also failed to read config by executing doveconf: /var/run/dovecot/config is a UNIX socket (path is from CONFIG_FILE environment)

I don't know what is the problem source. Maybe too many connections etc.? Could you tell me how to debug this issue?

 

[Sebahat.hadzhi]

Hello, @MariuszB . Could you please check the dovecot service status and let us know if you see any additional entries:

systemctl status dovecot.service

As far as I am aware, the issue could be related to the default_vsz_limit, thus, you might try increasing it according to the instructions from this article.

 

[MariuszB]

I set default_vsz_limit to 1G. On status I didn't see any interesting entries.

 

[Sebahat.hadzhi]

Thank you for the confirmation. Please monitor the behavior and let us know if the issue continues.

 

[MariuszB]

Unfortunately problem comes back. This is what I found in maillog:

Oct 2 08:45:14 h8 dovecot[2122699]: pop3-login: Fatal: Error reading configuration: read(/var/run/dovecot/config) failed: read(size=8192) failed: Interrupted system call - Also failed to read config by executing doveconf: /var/run/dovecot/config is a UNIX socket (path is from CONFIG_FILE environment)
Oct 2 08:45:14 h8 dovecot[2122682]: master: Error: service(pop3-login): command startup failed, throttling for 32.000 secs
Oct 2 08:45:21 h8 dovecot[2122699]: imap-login: Fatal: Error reading configuration: read(/var/run/dovecot/config) failed: read(size=8192) failed: Interrupted system call - Also failed to read config by executing doveconf: /var/run/dovecot/config is a UNIX socket (path is from CONFIG_FILE environment)
Oct 2 08:45:21 h8 dovecot[2122682]: master: Error: service(imap-login): command startup failed, throttling for 4.000 secs
Oct 2 08:45:35 h8 dovecot[2122699]: imap-login: Fatal: Error reading configuration: read(/var/run/dovecot/config) failed: read(size=8192) failed: Interrupted system call - Also failed to read config by executing doveconf: /var/run/dovecot/config is a UNIX socket (path is from CONFIG_FILE environment)
Oct 2 08:45:35 h8 dovecot[2122682]: master: Error: service(imap-login): command startup failed, throttling for 8.000 secs
Oct 2 08:45:53 h8 dovecot[2122699]: imap-login: Fatal: Error reading configuration: read(/var/run/dovecot/config) failed: read(size=8192) failed: Interrupted system call - Also failed to read config by executing doveconf: /var/run/dovecot/config is a UNIX socket (path is from CONFIG_FILE environment)
Oct 2 08:45:53 h8 dovecot[2122682]: master: Error: service(imap-login): command startup failed, throttling for 16.000 secs
Oct 2 08:45:56 h8 dovecot[2122699]: pop3-login: Fatal: Error reading configuration: read(/var/run/dovecot/config) failed: read(size=8192) failed: Interrupted system call - Also failed to read config by executing doveconf: /var/run/dovecot/config is a UNIX socket (path is from CONFIG_FILE environment)
Oct 2 08:45:56 h8 dovecot[2122682]: master: Error: service(pop3-login): command startup failed, throttling for 60.000 secs

 

[Sebahat.hadzhi]

Thank you for the update. Could you please also try running plesk repair mail and confirm if that helped solving the issue?

 

[MariuszB]

I made mail repair without success. Problem is still exists.