[gentoo-user] NFS mount not properly unmounting during shutdown/reboot

[gentoo-user] NFS mount not properly unmounting during shutdown/reboot

[Tanstaafl]

Hi all,

Ok, now would like to investigate this to see why this is causing my 
shutdowns/reboots to hang with the last thing on the screen being 
'unmounting /var...'

Anyone got any idea where to look? I sure don't...

I see a googling session in my near future, but any pointers that may 
help expedite this would be appreciated...

Thanks!

Re: [gentoo-user] NFS mount not properly unmounting during shutdown/reboot

[Tanstaafl]

Sorry, that wasn't much of a problem description...

I have a system that I often manually mount and unmount some NFS mounts...

If I try to do a reboot or shutdown of the system while one of these NFS 
mounts is mounted, it hangs with the last thing showing on the screen as 
"Unmounting /var..."

I've let it sit there for at least half an hour, maybe more, so I don't 
think it would ever continue...

If I remember to manually unmount the NFS mount before initiating the 
reboot/shutdown, it doesn't hang.

I'm guessing that it hangs at /var because it is the last mountpoint 
defined in my /etc/fstab?

So... any pointers on where to look for a resolution would be appreciated.

Resolution being, if I can manually unmount it fine, why can't the 
system auto-unmount it?

Thanks,

Charles

On 2013-06-09 4:23 PM, Tanstaafl <tanstaafl@libertytrek.org> wrote:
> Hi all,
>
> Ok, now would like to investigate this to see why this is causing my
> shutdowns/reboots to hang with the last thing on the screen being
> 'unmounting /var...'
>
> Anyone got any idea where to look? I sure don't...
>
> I see a googling session in my near future, but any pointers that may
> help expedite this would be appreciated...
>
> Thanks!
>

Re: [gentoo-user] NFS mount not properly unmounting during shutdown/reboot

[Alan McKinnon]

On 10/06/2013 12:34, Tanstaafl wrote:
> Sorry, that wasn't much of a problem description...
> 
> I have a system that I often manually mount and unmount some NFS mounts...
> 
> If I try to do a reboot or shutdown of the system while one of these NFS
> mounts is mounted, it hangs with the last thing showing on the screen as
> "Unmounting /var..."
> 
> I've let it sit there for at least half an hour, maybe more, so I don't
> think it would ever continue...
> 
> If I remember to manually unmount the NFS mount before initiating the
> reboot/shutdown, it doesn't hang.
> 
> I'm guessing that it hangs at /var because it is the last mountpoint
> defined in my /etc/fstab?
> 
> So... any pointers on where to look for a resolution would be appreciated.
> 
> Resolution being, if I can manually unmount it fine, why can't the
> system auto-unmount it?


Let's get some facts to work with

can you post your fstab, rc-update show, /etc/exports on the NFS server
and the mount options used for the NFS mounts?





> 
> Thanks,
> 
> Charles
> 
> On 2013-06-09 4:23 PM, Tanstaafl <tanstaafl@libertytrek.org> wrote:
>> Hi all,
>>
>> Ok, now would like to investigate this to see why this is causing my
>> shutdowns/reboots to hang with the last thing on the screen being
>> 'unmounting /var...'
>>
>> Anyone got any idea where to look? I sure don't...
>>
>> I see a googling session in my near future, but any pointers that may
>> help expedite this would be appreciated...
>>
>> Thanks!
>>
> 
> 


-- 
Alan McKinnon
alan.mckinnon@gmail.com

Re: [gentoo-user] NFS mount not properly unmounting during shutdown/reboot

[Tanstaafl]

On 2013-06-10 6:38 AM, Alan McKinnon <alan.mckinnon@gmail.com> wrote:
> On 10/06/2013 12:34, Tanstaafl wrote:
>> If I remember to manually unmount the NFS mount before initiating the
>> reboot/shutdown, it doesn't hang.
>>
>> I'm guessing that it hangs at /var because it is the last mountpoint
>> defined in my /etc/fstab?
>>
>> So... any pointers on where to look for a resolution would be appreciated.
>>
>> Resolution being, if I can manually unmount it fine, why can't the
>> system auto-unmount it?

> Let's get some facts to work with
>
> can you post your fstab,

Fyi, I don't have either of these auto-mounting in fstab, but here it is:

# <fs>             <mountpoint>    <type>           <opts>   <dump/pass>

# NOTE: If your BOOT partition is ReiserFS, add the notail option to
# opts.
/dev/sda1           /boot           ext2            noauto,noatime  1 2
/dev/sda2           none            swap            sw              0 0
/dev/sda3           /               ext3            noatime         0 1
/dev/sda4           /backups        ext3            noatime         0 2
/dev/vg2/home       /home           reiserfs        noatime         0 0
/dev/vg2/usr        /usr            reiserfs        noatime         0 0
/dev/vg2/var        /var            reiserfs        noatime         0 0
/dev/cdroms/cdrom0  /mnt/cdrom      iso9660         noauto,ro       0 0
/dev/fd0            /mnt/floppy     auto            noauto          0 0

# NOTE: The next line is critical for boot!
none                /proc           proc            defaults        0 0

# glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for
# POSIX shared memory (shm_open, shm_unlink).
# (tmpfs is a dynamically expandable/shrinkable ramdisk, and will
#  use almost no memory if not populated with files)
shm                 /dev/shm        tmpfs      nodev,nosuid,noexec  0 0

> rc-update show,

  # rc-update show
               apache2 |      default
              bootmisc | boot
           consolefont | boot
                 devfs |                                        sysinit
         device-mapper | boot
                 dmesg |                                        sysinit
               dovecot |      default
                  fsck | boot
              hostname | boot
               hwclock | boot
              iptables |      default
               keymaps | boot
             killprocs |                        shutdown
                 local |      default nonetwork
            localmount | boot
                   lvm | boot
               mailman |      default
               modules | boot
              mount-ro |                        shutdown
                  mtab | boot
                 mysql |      default
              net.eth0 |      default
                net.lo | boot
              netmount |      default
            ntp-client |      default
                  ntpd |      default
               postfix |      default
                procfs | boot
                  root | boot
               rpcbind |      default
             savecache |                        shutdown
                  sshd |      default
                  swap | boot
             swapfiles | boot
                sysctl | boot
                 sysfs |                                        sysinit
             syslog-ng |      default
          termencoding | boot
        tmpfiles.setup | boot
                  udev |                                        sysinit
            udev-mount |                                        sysinit
        udev-postmount |      default
               urandom | boot
            vixie-cron |      default
                xinetd |      default


> /etc/exports on the NFS server

Well... there is no 'NFS Server', these are two QNAP boxes that I can 
enable NFS on... I guess there may be a way to command-line into them to 
check that, so if it critical to answering the question, I'll see what I 
can do. All I know for sure is, if I manually unmount it with umount 
/mnt/qnap-mountpoint, it unmounts immediately.

> and the mount options used for the NFS mounts?

The command I use to mount it is:

mount -t nfs -o mountproto=tcp qnap1:/backups /mnt/qnap1

Thanks Alan, hopefully something jumps out at you...

Re: [gentoo-user] NFS mount not properly unmounting during shutdown/reboot

[Alan McKinnon]

On 10/06/2013 16:36, Tanstaafl wrote:
> On 2013-06-10 6:38 AM, Alan McKinnon <alan.mckinnon@gmail.com> wrote:
>> On 10/06/2013 12:34, Tanstaafl wrote:
>>> If I remember to manually unmount the NFS mount before initiating the
>>> reboot/shutdown, it doesn't hang.
>>>
>>> I'm guessing that it hangs at /var because it is the last mountpoint
>>> defined in my /etc/fstab?
>>>
>>> So... any pointers on where to look for a resolution would be
>>> appreciated.
>>>
>>> Resolution being, if I can manually unmount it fine, why can't the
>>> system auto-unmount it?
> 
>> Let's get some facts to work with
>>
>> can you post your fstab,
> 
> Fyi, I don't have either of these auto-mounting in fstab, but here it is:
> 
> # <fs>             <mountpoint>    <type>           <opts>   <dump/pass>
> 
> # NOTE: If your BOOT partition is ReiserFS, add the notail option to
> # opts.
> /dev/sda1           /boot           ext2            noauto,noatime  1 2
> /dev/sda2           none            swap            sw              0 0
> /dev/sda3           /               ext3            noatime         0 1
> /dev/sda4           /backups        ext3            noatime         0 2
> /dev/vg2/home       /home           reiserfs        noatime         0 0
> /dev/vg2/usr        /usr            reiserfs        noatime         0 0
> /dev/vg2/var        /var            reiserfs        noatime         0 0
> /dev/cdroms/cdrom0  /mnt/cdrom      iso9660         noauto,ro       0 0
> /dev/fd0            /mnt/floppy     auto            noauto          0 0
> 
> # NOTE: The next line is critical for boot!
> none                /proc           proc            defaults        0 0
> 
> # glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for
> # POSIX shared memory (shm_open, shm_unlink).
> # (tmpfs is a dynamically expandable/shrinkable ramdisk, and will
> #  use almost no memory if not populated with files)
> shm                 /dev/shm        tmpfs      nodev,nosuid,noexec  0 0
> 
>> rc-update show,
> 
>  # rc-update show
>               apache2 |      default
>              bootmisc | boot
>           consolefont | boot
>                 devfs |                                        sysinit
>         device-mapper | boot
>                 dmesg |                                        sysinit
>               dovecot |      default
>                  fsck | boot
>              hostname | boot
>               hwclock | boot
>              iptables |      default
>               keymaps | boot
>             killprocs |                        shutdown
>                 local |      default nonetwork
>            localmount | boot
>                   lvm | boot
>               mailman |      default
>               modules | boot
>              mount-ro |                        shutdown
>                  mtab | boot
>                 mysql |      default
>              net.eth0 |      default
>                net.lo | boot
>              netmount |      default
>            ntp-client |      default
>                  ntpd |      default
>               postfix |      default
>                procfs | boot
>                  root | boot
>               rpcbind |      default
>             savecache |                        shutdown
>                  sshd |      default
>                  swap | boot
>             swapfiles | boot
>                sysctl | boot
>                 sysfs |                                        sysinit
>             syslog-ng |      default
>          termencoding | boot
>        tmpfiles.setup | boot
>                  udev |                                        sysinit
>            udev-mount |                                        sysinit
>        udev-postmount |      default
>               urandom | boot
>            vixie-cron |      default
>                xinetd |      default
> 
> 
>> /etc/exports on the NFS server
> 
> Well... there is no 'NFS Server', these are two QNAP boxes that I can
> enable NFS on... I guess there may be a way to command-line into them to
> check that, so if it critical to answering the question, I'll see what I
> can do. All I know for sure is, if I manually unmount it with umount
> /mnt/qnap-mountpoint, it unmounts immediately.
> 
>> and the mount options used for the NFS mounts?
> 
> The command I use to mount it is:
> 
> mount -t nfs -o mountproto=tcp qnap1:/backups /mnt/qnap1
> 
> Thanks Alan, hopefully something jumps out at you...
> 

I'm not familiar with QNAP but there's nothing for it in fstab, so I
presume running the relevant app on your end magically mounts the remote
share without consulting fstab?

It all looks very much like your init system is simply not umounting the
shares at all so when it tries to remount / ro near the end, this fails.

The simplest way around this is to add nfsmount to the default runlevel.
This will work today as it reads /etc/fstab at startup to mount stuff
and your fstab has no nfs shares in it.
It reads /etc/mtab at shutdown to umount stuff and your QNAP share will
be in that file.

I simulated it here and that's the result I got. But this is gentoo, and
everything might change tomorrow so YMMV :-)

You could also write a scriptlet to do the umount and put it in
/etc/conf.d/local - see /etc/init.d/local for details



-- 
Alan McKinnon
alan.mckinnon@gmail.com

SOLVED - Re: [gentoo-user] NFS mount not properly unmounting during shutdown/reboot

[Tanstaafl]

On 2013-06-10 4:29 PM, Alan McKinnon <alan.mckinnon@gmail.com> wrote:
> The simplest way around this is to add nfsmount to the default runlevel.
> This will work today as it reads /etc/fstab at startup to mount stuff
> and your fstab has no nfs shares in it.
> It reads /etc/mtab at shutdown to umount stuff and your QNAP share will
> be in that file.

Cool, I'll do that. I'll still try to remember to umount it manually 
because I don't like testing something that might cause my system to not 
safely/fully shutdown, but this way hopefully if I ever do forget, it 
will handle it for me.

> I simulated it here and that's the result I got. But this is gentoo, and
> everything might change tomorrow so YMMV :-)

Lol, yeah, there are never any guarantees...

> You could also write a scriptlet to do the umount and put it in
> /etc/conf.d/local - see /etc/init.d/local for details

I may look into that, but some reading tells me you are right and that 
adding nfsmount to the default runlevel should work.

Thanks a lot for your time Alan.

Charles

Re: [gentoo-user] NFS mount not properly unmounting during shutdown/reboot

[Thanasis]

on 06/10/2013 11:29 PM Alan McKinnon wrote the following:
<snip>
> 
> You could also write a scriptlet to do the umount and put it in
> /etc/conf.d/local - see /etc/init.d/local for details
> 

Actually /etc/conf.d/local has been replaced by files you put in
directory /etc/local.d/
ie:
/etc/local.d/*.start
and
/etc/local.d/*.stop

Re: [gentoo-user] NFS mount not properly unmounting during shutdown/reboot

[Alan McKinnon]

On 11/06/2013 14:38, Thanasis wrote:
> on 06/10/2013 11:29 PM Alan McKinnon wrote the following:
> <snip>
>>
>> You could also write a scriptlet to do the umount and put it in
>> /etc/conf.d/local - see /etc/init.d/local for details
>>
> 
> Actually /etc/conf.d/local has been replaced by files you put in
> directory /etc/local.d/
> ie:
> /etc/local.d/*.start
> and
> /etc/local.d/*.stop
> 

Your right - I mistakenly copy-pasted the wrong path from /etc/init.d/local

my bad



-- 
Alan McKinnon
alan.mckinnon@gmail.com