Date: Mon, 6 May 2013 13:10:02 -0700 From: Jeremy Chadwick <jdc@koitsu.org> To: Zaphod Beeblebrox <zbeeble@gmail.com> Cc: FreeBSD Stable <freebsd-stable@freebsd.org>, Navdeep Parhar <nparhar@gmail.com> Subject: Re: multiple NFS mounts with bg,retrycount=0 Message-ID: <20130506201002.GA21928@icarus.home.lan> In-Reply-To: <CACpH0Me5Uf_V9nS8PzFya%2BPmf-3Z_Dz65rTb3uLLM_5vC5JRng@mail.gmail.com> References: <5187ECE6.2030205@gmail.com> <CACpH0Me5Uf_V9nS8PzFya%2BPmf-3Z_Dz65rTb3uLLM_5vC5JRng@mail.gmail.com>
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On Mon, May 06, 2013 at 03:46:51PM -0400, Zaphod Beeblebrox wrote:
> [about double background NFS mounts]
>
> I'm not sure on the fix to this, but I'm pretty sure it's because we retry
> the mount -a stuff twice at startup. If you watch your console, you'll see
> two places where it will "mount NFS filesystems" during boot.
>
> ... well... a fix to this would be to _not_ do that twice ... but hey :).
Preface: I'm not aware of mount(8) actually permitting the mounting of
two NFS filesystems at the same mountpoint (e.g. wouldn't the 2nd one
throw EPERM or some other condition?).
When I ran my co-lo, we used NFS on many client machines (on RELENG_8
and RELENG_9) and we *never* saw multiple mounts (to the same
mountpoint) on reboot. I also don't remember seeing the message in
question twice -- only once.
That said:
Can you please determine if /etc/rc.d/mountcritremote is doing this?
This is the only script which issues such echo statements. The
relevant portion of the script:
35 mountcritremote_start()
36 {
37 # Mount nfs filesystems.
38 #
39 case "`/sbin/mount -d -a -t nfs`" in
40 '')
41 ;;
42 *)
43 echo -n 'Mounting NFS file systems:'
44 mount -a -t nfs
45 echo '.'
46 ;;
47 esac
48
49 # Mount other network filesystems if present in /etc/fstab.
50 case ${extra_netfs_types} in
51 [Nn][Oo])
52 ;;
53 *)
54 netfs_types="${netfs_types} ${extra_netfs_types}"
55 ;;
56 esac
57
58 for i in ${netfs_types}; do
59 fstype=${i%:*}
60 fsdecr=${i#*:}
61
62 [ "${fstype}" = "nfs" ] && continue
63
64 case "`mount -d -a -t ${fstype}`" in
65 *mount_${fstype}*)
66 echo -n "Mounting ${fsdecr} file systems:"
67 mount -a -t ${fstype}
68 echo '.'
69 ;;
70 esac
71 done
And the defaults for $netfs_types and $extra_netfs_types:
netfs_types="nfs:NFS oldnfs:OLDNFS smbfs:SMB portalfs:PORTAL nwfs:NWFS" # Net filesystems.
extra_netfs_types="NO" # List of network extra filesystem types for delayed
Now look at lines 58 through 62 above (specifically 62). $fstype
should contain "nfs" thus should be skipped over. And "oldnfs" would
cause the echo statement to be "Mounting OLDNFS file systems:".
If you could try to figure out where/what rc script is causing this
for you, that'd be great.
And a final point: disclose of exactly what FreeBSD version you're using
(including build date or SVN rXXXXXX number) would be wonderful. The
reason I mention that is because mountcritremote has been adjusted
**after** 9.1-RELEASE (see r242153):
http://svnweb.freebsd.org/base/stable/9/etc/rc.d/mountcritremote
Let us know what you find.
--
| Jeremy Chadwick jdc@koitsu.org |
| UNIX Systems Administrator http://jdc.koitsu.org/ |
| Mountain View, CA, US |
| Making life hard for others since 1977. PGP 4BD6C0CB |
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