Re: [gentoo-user] Re: resolv.conf full of old info

[Michael <confabulate@kintzios.com>]

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On Wednesday, 19 October 2022 01:00:31 BST Grant Edwards wrote:
> On 2022-10-18, Grant Edwards <grant.b.edwards@gmail.com> wrote:
> > I've noticed that /etc/resolv.conf seems to accumulate obsolete,
> > useless info as my laptop moves from one network to another. It looks
> > like dhcpcd adds stuff when a connection comes up, but never removes
> > it when the connection goes down.
> 
> This appears to be caused by the "persistent" option in dhcpcd.conf,
> which is set by default. I commented it out, and now resolv.conf
> behaves rationally: it only contains info for network connections that
> are up.
> 
> Why would dhcpcd have the persistent option enabled by default?
> 
> --
> Grant

I think because this causes less breakage in those cases where netmount, 
remote syslog-ng, SSH clients, or root mounted NFS is in play?  This is what 
the man page says about it:

"... dhcpcd normally de-configures the interface and configuration when it 
exits.  Sometimes, this isn't desirable if, for example, you have root mounted 
over NFS or SSH clients connect to this host and they need to be notified of 
the host shutting down."

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