CentOS - Aug 2017 - more questions on setting up autofs on C7

Hi!

Thanks to some of you I got autofs set up on my C7 netbook for
mounting local cifs filesytems.

Now I want to do something on my C7 desktop machine, that seems to
me to be a little different, and I"m not sure how to do it.

I have an external RAID1 box that attaches via USB. It is/will be
nearly always /dev/sdc, but being USB I can't guarantee that it
will always be found there.

accordingly, in my /etc/fstab I have an entry that mounts it via its
UUID:

UUID=09bfc97a-8db2-46de-b4dd-427da19b114     /mnt/backup     xfs   
defaults,noauto,users 0 2

and I'm wondering how to specify that in an autofs recipe instead...

If doing cifs mounts, /etc/auto.master may contain this line:

/mymount /etc/auto.mymount

then there would be a file /etc/auto.mymount that contains a line 
similar to this:

winbox  -fstype=cifs,rw,noperm,user=sushi,pass=yummy ://winbox/getme

so, in my case, the USB drive contains an xfs filesystem. would I
do something like this:

in /etc/auto.master:

backup /etc/auto.backup

and in /etc/auto.backup

backup -fstype=xfs,defaults,noauto,users
:UUID=09bfc97a-8db2-46de-b4dd-427da19b114

Would that be expected to work, or am I all overlooking something obvious?

Thanks in advance for your advice!

Fred
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On 08/21/2017 07:23 PM, Fred Smith wrote:
> so, in my case, the USB drive contains an xfs filesystem. would I
> do something like this:
>
> in /etc/auto.master:
> backup /etc/auto.backup
>
> and in /etc/auto.backup
> backup -fstype=xfs,defaults,noauto,users
:UUID=09bfc97a-8db2-46de-b4dd-427da19b114
In auto.master, the first field is a directory, so it should be
"/backup".

Debian's documentation says you shouldn't need to prefix UUID with a 
':', so remove that from auto.backup if the configuration you described 
doesn't work.  Alternatively, you could specify its location as 
":/dev/disk/by-uuid/<the disk id>".

On Wed, Aug 23, 2017 at 12:03:12PM -0700, Gordon Messmer
wrote:
> On 08/21/2017 07:23 PM, Fred Smith wrote:
> >so, in my case, the USB drive contains an xfs filesystem. would I
> >do something like this:
> >
> >in /etc/auto.master:
> >backup /etc/auto.backup
> >
> >and in /etc/auto.backup
> >backup -fstype=xfs,defaults,noauto,users
:UUID=09bfc97a-8db2-46de-b4dd-427da19b114
> 
> In auto.master, the first field is a directory, so it should be
"/backup".
> 
> Debian's documentation says you shouldn't need to prefix UUID with
a
> ':', so remove that from auto.backup if the configuration you
> described doesn't work.  Alternatively, you could specify its
> location as ":/dev/disk/by-uuid/<the disk id>".
Ok, when I actually tried it, I did it this way:

/etc/auto.master (excerpt):

	/mnt /etc/auto.mnt

and /etc/auto.mnt:

	backup -fstype=xfs,defaults,noauto,users,rw
:UUID=09bfc97a-8db2-46de-b4dd-427da19b1143

and lo and behold, it works!

but...

I have a couple of other networked filesystems (cifs) that I have always
mounted in /mnt. so, after accessing either of them, systemctl status autofs
shows me this:

Aug 23 15:46:02 fcshome.stoneham.ma.us systemd[1]: Starting Automounts
filesystems on demand...
Aug 23 15:46:02 fcshome.stoneham.ma.us automount[11265]: setautomntent:
lookup(sss): setautomntent: No such fil...ory
Aug 23 15:46:02 fcshome.stoneham.ma.us systemd[1]: Started Automounts
filesystems on demand.
Aug 23 15:50:04 fcshome.stoneham.ma.us automount[11265]: key
"syno-fredex" not found in map source(s).
Aug 23 15:50:04 fcshome.stoneham.ma.us automount[11265]: key
"syno-public" not found in map source(s).

the first error regarding setautomntent seems to be pretty universal,
as I see lots of questions about it (and bugs filed against Fedora and
RHEL) but no actual solution. the consensus is that it doesn't seem to
prevent autofs from working. (there is a workaround that I haven't
tried, and mention of a patch to sssd that I also haven't tried, and
which apparently hasn't made it into RHEL 7.3 or Centos7.x).

so, the two lines saying: Key "syno-fredex" or key
"syno-public"
appear whenever I try to access one of those two filesystems. I AM NOT
USING AUTOFS TO MANAGE THEM. they were mounting in /mnt, just like the
automount I was asking about. thinking since autofs was looking in /mnt
for the backup mount that it was getting all confuzzled, I changed the
mount point of those other two filesystems, changed their entries in
/etc/fstab, reran systemctl restart autofs then touched one of those cifs
filesystems. Voila! the errors still appear in the output of systemctl
status autofs.

Everything still appears to work, but I'm puzzled by those two errors.

Anyone got any good ideas on this?

thanks in advance!

Fred
-- 
---- Fred Smith -- fredex at fcshome.stoneham.ma.us
-----------------------------
               But God demonstrates his own love for us in this: 
                         While we were still sinners, 
                              Christ died for us.
------------------------------- Romans 5:8 (niv) ------------------------------