[CentOS] rare but repeating system crash in C7

Thu Jan 7 13:50:41 UTC 2021
Fred <fred.fredex at gmail.com>

Seems to be. Thanks again!

Fred

On Thu, Jan 7, 2021 at 1:46 AM Simon Matter <simon.matter at invoca.ch> wrote:

> Hi Fred, no I was asking about the auto mount and umount issue you had.
> Did you get it to work correctly?
>
> Simon
>
> > Simon, if you're talking about the occasional crash, I don't know, since
> > it
> > happens only occasionally. If I can make it thru six months without
> seeing
> > it, then I'll declare it fixed.
> >
> > Thanks!
> >
> > On Wed, Jan 6, 2021 at 1:23 PM Simon Matter <simon.matter at invoca.ch>
> > wrote:
> >
> >> Have you been able to fix the issue?
> >>
> >> Regards,
> >> Simon
> >>
> >> > OK, here's where I stand now:
> >> > 1. I stopped and disabled autofs. (I have 2 SMB filesystems out on the
> >> LAN
> >> > that have also been automounting with autofs, do I need to do similar
> >> > changes in fstab for them?)
> >> > 2. yes it has.
> >> > 3. none I can see.
> >> > 4. nothing that leaps out at me. there are a couple about /mnt/backup
> >> not
> >> > existing but they appear to be old ones, aren't happening anymore.
> >> >
> >> > So, I've made a minor tweak to /etc/fstab, nothing that should matter.
> >> > rebooted, and when it comes up /mnt/backup is mounted. TWICE,
> >> according
> >> to
> >> > the output of mount:
> >> >
> >> >  $ mount | grep backup
> >> > systemd-1 on /mnt/backup type autofs
> >> >
> >>
> (rw,relatime,fd=25,pgrp=1,timeout=900,minproto=5,maxproto=5,direct,pipe_ino=9840)
> >> > /dev/sdc1 on /mnt/backup type ext4
> >> > (rw,relatime,seclabel,stripe=8191,data=ordered)
> >> >
> >> > is this really a double mount, or is this what I'm supposed to be
> >> seeing?
> >> >
> >> > doesn't seem to timeout and auto umount.
> >> >
> >> > Thanks again for your assistance!
> >> >
> >> > Fred
> >> >
> >> > On Mon, Jan 4, 2021 at 7:48 AM Strahil Nikolov via CentOS
> >> > <centos at centos.org>
> >> > wrote:
> >> >
> >> >> Verify that:
> >> >> 1. Autofs is not running
> >> >> 2. Systemd has created '.mount' and '.automount' units
> >> >> systemctl status mnt-backup.mount mnt-backup.automount
> >> >> systemctl cat mnt-backup.mount mnt-backup.automount
> >> >>
> >> >> 3. Verify that there are no errors in local-fs.target
> >> >> systemctl status local-fs.target
> >> >>
> >> >> 4. Check for errors via:
> >> >> mount -a
> >> >> journalctl -e
> >> >>
> >> >> Best Regards
> >> >> Strahil Nikolov
> >> >>
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> В понеделник, 4 януари 2021 г., 01:29:25 Гринуич+2, Fred <
> >> >> fred.fredex at gmail.com> написа:
> >> >>
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> OK, I think I've got it set up as described here, while fixing the
> >> >> misplaced fields in /etc/fstab:
> >> >>
> >> >> UUID=259ec5ea-e8a4-465a-9263-1c06217b9aaf      /mnt/backup    ext4
> >> >> x-systemd.automount,x-systemd.idle-timeout=15min,noauto 0      2
> >> >>
> >> >> now when I do, e.g., "ls /mnt/backup"
> >> >>
> >> >> I get:
> >> >>
> >> >> $ sudo !!
> >> >> sudo ls /mnt/backup
> >> >> ls: cannot open directory /mnt/backup: No such file or directory
> >> >>
> >> >> if I do:
> >> >>
> >> >> ls /mnt
> >> >>
> >> >> I see:
> >> >>
> >> >> backup
> >> >>
> >> >> use su to become root, then:
> >> >> ls -l /mnt shows:
> >> >>
> >> >> # ls -al
> >> >> total 4
> >> >> drwxr-xr-x.  3 root root    0 Jan  2 13:24 .
> >> >> dr-xr-xr-x. 21 root root 4096 Jan  2 09:22 ..
> >> >> dr-xr-xr-x.  2 root root    0 Jan  2 13:24 backup
> >> >>
> >> >> ls backup shows:
> >> >>
> >> >> # ls -al backup
> >> >> ls: cannot open directory backup: No such file or directory
> >> >>
> >> >> why? it clearly appears to exist ????
> >> >>
> >> >> the FS isn't mounted, but /mnt/backup exists, so it should be visible
> >> as
> >> >> an
> >> >> entry directory. also, I can mount it manually:
> >> >>
> >> >> mount UUID=259ec5ea-e8a4-465a-9263-1c06217b9aaf      /mnt/backup
> >> >>
> >> >> and then access it. but it doesn't automount with, e.g. "ls
> >> /mnt/backup"
> >> >> or
> >> >> "ls /mnt/backup/backups".
> >> >>
> >> >> I must still be doing something wrong but maybe I'm too stupid to see
> >> >> it.
> >> >> (Please don't agree with me publicly...! :=) )
> >> >>
> >> >> Fred
> >> >>
> >> >> On Sun, Jan 3, 2021 at 4:36 PM Pete Biggs <pete at biggs.org.uk> wrote:
> >> >>
> >> >> > >
> >> >> > > I commented out those entries in /etc/auto.master before
> >> modifying
> >> >> the
> >> >> > > fstab entry:
> >> >> > >
> >> >> > > UUID=259ec5ea-e8a4-465a-9263-1c06217b9aaf      /mnt/backup
> >> >> > > ext4,x-systemd.automount,x-systemd.idle-timeout=15min  noauto  0
> >> >>  2
> >> >> >
> >> >> > That's not correct.  See 'man fstab'. It should be
> >> >> >
> >> >> >    device  mount-point  filesystem-type  options  dump  fsck
> >> >> >
> >> >> > So you should have:
> >> >> >
> >> >> > UUID=259ec5ea-e8a4-465a-9263-1c06217b9aaf  /mnt/backup  ext4
> >> >> >  x-systemd.automount,x-systemd.idle-timeout=15min,noauto 0 2
> >> >> >
> >> >> >
> >> >> > >
> >> >> > > which is exactly as it was before except for the x-systemd
> >> entries
> >> >> as
> >> >> you
> >> >> > > described.
> >> >> >
> >> >> > Yeah, you put them in the wrong place.
> >> >> >
> >> >> >
> >> >> > P.
> >> >> >
> >> >> >
> >> >> > _______________________________________________
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> >> >>
> >> >> >
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