On Fri, 10 Nov 2023 at 03:19, Chuck Lever III <chuck.lever@xxxxxxxxxx> wrote: > > > > > On Nov 9, 2023, at 7:47 PM, Cedric Blancher <cedric.blancher@xxxxxxxxx> wrote: > > > > On Fri, 10 Nov 2023 at 01:37, Chuck Lever III <chuck.lever@xxxxxxxxxx> wrote: > >> > >>> On Nov 9, 2023, at 7:05 PM, Cedric Blancher <cedric.blancher@xxxxxxxxx> wrote: > >>> > >>> On Thu, 2 Nov 2023 at 10:51, Cedric Blancher <cedric.blancher@xxxxxxxxx> wrote: > >>>> > >>>> Good morning! > >>>> > >>>> Does anyone have examples of how to use the refer= option in /etc/exports? > >>> > >>> Short answer: > >>> To redirect an NFS mount from local machine /ref/baguette to > >>> /export/home/baguette on host 134.49.22.111 add this to Linux > >>> /etc/exports: > >>> > >>> /ref *(no_root_squash,refer=/export/home@134.49.22.111) > >>> > >>> This is basically an exports(5) manpage bug, which does not provide > >>> ANY examples. > >> > >> That's because setting up a referral this way is deprecated. > > > > Why did you do that? > > The nfsref command on Linux matches the same command on Solaris. That does not answer my question. Why did you declare the refer option in exports(8) depreciated, where it works, and is a much simpler way than nfsref. nfsref information has to be maintained in yet another configuration file, and nfsd on Linux already has TOO MANY of them. Leave alone the fact that there is no Solaris-style INTRO manpage, which systematically links all config files for nfsd, and all daemons like rpc.gssd. The all-in-one /etc/exports and /etc/exports.d/ sounds like a better solution. > > nfsref was added years ago to manage junctions, as part of FedFS. > The "refer=" export option can't do that... and FedFS has gone > the way of the dodo. Can NFSv4 clients create junctions? Or just tools on the server side? > >> The > >> preferred way to do it is to use nfsref(8). > > > > nfsref(8) is not shipped by ANY Linux distribution. > > It is installed on all of my Fedora systems, and it's on my > only RHEL 8 system. That suggests, though I can't immediately > confirm it, that nfsref is packaged also for CentOS, Oracle > Linux, and any other distro that is based on RedHat Enterprise. > > > > The configure switch in nfs-utils to build it is OFF by default, > > You're talking about > > --enable-junction enable support for NFS junctions [default=no] YES, that nightmare. Nightmare, as it suddenly makes nfs-common depend on libidn11-dev libcap-dev libldap-dev libsqlite3-dev libxml2-dev liburiparser-dev libconfig-dev libdevmapper-dev and other packages. Package maintainer hell. > Perhaps that default should change -- it's been part of > nfs-utils for five years now. However, that drags in > dependencies for the xml libraries... maybe someone thinks > that's a hazard? Adding eight new package dependencies (libidn11-dev libcap-dev libldap-dev libsqlite3-dev libxml2-dev liburiparser-dev libconfig-dev libdevmapper-dev...) is a problem, especially the LDAP one. > > and the > > distribution maintainers refuse to enable it because it can be > > "dangerous", or may be "experimental". I got many excuses why they > > dont want to enable that damn configure option. > > > > Also, stable and oldstable Debian do not have it enabled either. > > This is an upstream mailing list. We can't answer for what > Linux distributors decide to enable or not. > > I've never heard that it was a dangerous feature. If a > distro maintainer has a concern, they should bring it to > upstream. > > > > Seriously, why was refer= in exports(5) depreciated? There is no > > realistic replacement, unless you fix every damn Linux distro first. > > Again, all the RHEL based distros package nfsref, as far > as I am aware. And as you found, refer= still works. It's > simply not documented. > > If your distro has decided not to support referrals, there's > not much we can do about that except gently suggest that you > switch to a distro that properly supports them. > > > > PS: Sorry for being moody, but I tried to get nfsref(5) working for a > > month on Debian bullseye, and it just didn't work. > > Did you report problems or ask for help? yes > > If getting it working is that difficult, perhaps your distro's > nfs-utils maintainer couldn't get it working either. Maybe. Ced -- Cedric Blancher <cedric.blancher@xxxxxxxxx> [https://plus.google.com/u/0/+CedricBlancher/] Institute Pasteur
