ulimit -n vs client_limit vs process_limit

[Aki Tuomi]

You need to adjust LimitNOFiles (or ulimit -n). Dovecot needs more file descriptors than just the ones used by imap-login process, so it is a good idea to consider setting it to at least 3x time the value.

Aki

> On 17/12/2020 04:57 Joseph Tam <jtam.home at gmail.com> wrote:
> 
>  
> As many of my users are accessing their mail remotely, I've seen
> service loads increase and came across this log messages which I
> haven't seen before
> 
>  	imap-login: Error: socketpair() failed: Too many open files: user=<*>, ...
> 
> I gather I have to increase file descriptor limits, which is currently
> set to match
> 
>  	default_client_limit = 1000
> 
> What should I set "ulimit -n" relative to client_limit? Or perhaps I've roofed
> 
>  	service imap-login {
>  		process_limit = 2
>  		...
>  	}
> 
> and should adjust that?
> 
> Joseph Tam <jtam.home at gmail.com>