[CentOS] rare but repeating system crash in C7

Wed Jan 6 18:23:16 UTC 2021
Simon Matter <simon.matter at invoca.ch>

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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