CentOS - Oct 2018 - systemd automount of cifs share hangs

Running latest CentOS 7.5. Since I found out about automount unit files 
I've had mixed results using them to mount shares from my NAS. Lately they 
seem to hang if I touch the mount point, but I can start the mount unit 
without problems. I had it working months ago, so I'm thinking something 
changed in the systemd updates.

For each mount point, I have two files in /etc/systemd/system named with 
the path of the mount point and with extensions .automount and .mount, 
following the systemd documentation. For example, srv-dav-name1.mount and 
srv-dav-name1.automount to mount a NAS share to /srv/dav/name1. I can issue 
"systemctl start srv-dav-name1.mount" and the mount completes
instantly.
But if I start the automount unit and ls the mount point, the shell hangs 
and eventually, a long time later (I haven't timed it, maybe an hour), I 
eventually get a prompt again. Control-C won't interrupt it. I can still 
ssh in and get another session so it's just the process that's accessing
the mount point that hangs.

Any suggestions on how I can debug this? I'm still new to finding the right 
log files. /var/log/messages doesn't show any errors like timeouts.

*** This response is my personal opinion and may not reflect that of my
employer. ***

I have never used the .automount file.... I have the .mount file configured for
various SAMBA shares, and I simply issued "systemctl enable
share-x-y-z.mount" to get them to mount on boot.

Greg


-----Original Message-----
From: CentOS <centos-bounces at centos.org> On Behalf Of Kenneth Porter
Sent: October 19, 2018 3:39 PM
To: CentOS mailing list <centos at centos.org>
Subject: [CentOS] systemd automount of cifs share hangs

Running latest CentOS 7.5. Since I found out about automount unit files I've
had mixed results using them to mount shares from my NAS. Lately they seem to
hang if I touch the mount point, but I can start the mount unit without
problems. I had it working months ago, so I'm thinking something changed in
the systemd updates.

For each mount point, I have two files in /etc/systemd/system named with the
path of the mount point and with extensions .automount and .mount, following the
systemd documentation. For example, srv-dav-name1.mount and
srv-dav-name1.automount to mount a NAS share to /srv/dav/name1. I can issue
"systemctl start srv-dav-name1.mount" and the mount completes
instantly.
But if I start the automount unit and ls the mount point, the shell hangs and
eventually, a long time later (I haven't timed it, maybe an hour), I
eventually get a prompt again. Control-C won't interrupt it. I can still ssh
in and get another session so it's just the process that's accessing the
mount point that hangs.

Any suggestions on how I can debug this? I'm still new to finding the right
log files. /var/log/messages doesn't show any errors like timeouts.
_______________________________________________
CentOS mailing list
CentOS at centos.org
https://lists.centos.org/mailman/listinfo/centos

On 10/21/2018 1:12 PM, Young, Gregory wrote:
> I have never used the .automount file.... I have the .mount file configured
for various SAMBA shares, and I simply issued "systemctl enable
share-x-y-z.mount" to get them to mount on boot.
After a power failure, I can't guarantee that the NAS comes up before 
the CentOS box tries to mount shares from it. I figure if I use an 
automount, the process trying to access it will just wait if the NAS 
isn't up yet, but the rest of the system will boot normally.