[Dovecot] Wait for interface to become available instead of dying?

[Jeroen Massar]

On 2013-06-10 02:45, Sebastian Arcus wrote:
> At the moment, if one of the interfaces specified with "listen=" in
> dovecot.conf is not up when Dovecot is started, then Dovecot just
> refuses to start. Is there an option to make Dovecot start anyway, and
> just use the interface when it becomes available? It is inconvenient to
> have Dovecot refuse to start during boot because some interface is
> temporarily not available.
> 
> Then again, maybe there is some strong security reasoning behind the way
> Dovecot behaves at the moment?

Depending on platform, but on Linux:

sysctl -w net.ipv4.ip_nonlocal_bind = 1

And presto. Do note that figuring out that some applications are then
misconfigured is a lot of fun, though 'netstat -anp' will help with
that. (-p only as root on again Linuxes)

Greets,
 Jeroen