Settings to scale HestiaCP

1

We run a HestiaCP instance with over 100 users and over 200 domains, and have hit configuration challenges multiple times which have taken us days to track down.
So I am opening this thread to share settings to be tweaked, including why (typically a log error message) and how to check whether the settings work.

Feel free to enjoy and contribute!

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2

Dovecot imap-login process_limit

Issue: User logins are erratically rejected

Component: dovecot

Log Message (/var/log/dovecot.log):

master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped

Configuration

Adjust in /etc/dovecot/conf.d/10-master.conf:

service imap-login {
  process_limit = 100
}

Apply with: sudo systemctl reload dovecot

Command to check config value (default seems to be 100, config is not changed by default with HestiaCP):

doveconf -n | grep process_limit || echo 100
1 Like
3

Too many open files

Issue: Sporadic nginx restart failures

Detailed thread: Too many open files despite config adjustments - #18 by xeruf

1 Like
4

Automatic updates without config prompts

Put the following into /etc/apt/apt.conf.d/force-confold to make apt always keep your current configuration of all services on update:

Dpkg::Options {
   "--force-confdef";
   "--force-confold";
}
3 Likes