Date: Sun, 12 Sep 2010 11:32:17 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: Tim Kientzle <tim@kientzle.com> Cc: freebsd-current@freebsd.org Subject: Re: Experimental NFS server oddity Message-ID: <1596813331.782431.1284305537136.JavaMail.root@erie.cs.uoguelph.ca> In-Reply-To: <DFB06E9E-1565-4D20-9DB5-F24CA49E5927@kientzle.com>
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> On Sep 11, 2010, at 5:26 PM, Rick Macklem wrote: > >> On Sep 11, 2010, at 4:20 PM, Rick Macklem wrote: > >> > >>> You can also look in /var/log/messages to see if any of the > >>> daemons > >>> are complaining about something. > >> > >> Only warning I see on a system reboot is: > >> nfsd: can't open /var/db/nfs-stablerestart > >> > >> Creating this file and then rebooting the system seems to get > >> things > >> working. > >> > >> This file certainly wasn't required by the old nfsd. > >> Should this file be created by /etc/rc.d/nfsserver at boot time (if > >> it > >> doesn't exist)? > >> Or should it be created by installworld? > >> > > Technically, it should only be created for a fresh install on a disk > > that has never been set up before. (ie. Not on an update/upgrade > > unless it has never existed before.) > > .... > > As such, I just documented it in "man nfsv4" for now, > > This is going to bite people on upgrades since > the old server didn't require this file, so people > upgrading from the old nfsd are going to hit > this problem pretty consistently. > > I'd like to at least consider alternatives to the > current behavior; maybe one of the following? > * If the file doesn't exist on startup, create it > and warn loudly. > * Similar to isc-dhcp, periodically make a > a backup copy of the file and only create a > fresh blank one if the file and backup are > both missing. I think this might be a reasonable compromise. The kernel can signal the master nfsd (which remains in userland) to copy the file to a backup after it has been updated, then the backup can be used if the regular one is lost/corrupted. If neither exists, creating new ones seems reasonable. Other opinions? rick > * "make installworld" is certainly capable > of creating this file only if it doesn't already > exist. (That doesn't cover the binary > update case, of course.)
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