Hi Josh,
On Wed, May 11, 2016 at 9:08 PM, Josh Fisher <jfis...@pvct.com> wrote:
>
> The mountpoint with root:root permission is correct. The mountpoint is
> created by root (a script called from a udev rule) and is a directory on
> the underlying filesystem until something gets mounted. When another
> filesystem gets mounted at that mountpoint, then the permissions for the
> mountpoint path will take on the permissions of the newly mounted
> filesystem. When the filesystem is unmounted, the permissions for that path
> will revert back to the underlying filesystem (ie. back to root:root). You
> need to make sure that the permissions are bacula:tape when it is mounted,
> but it doesn't matter what the permissions are when it is unmounted.
>
> The vchanger-mount-uuid.sh script first looks in /etc/fstab for a matching
> uuid. If found, then it uses the mountpoint specified in fstab. If not
> found, then it creates a mountpoint (if it doesn't already exist) at
> $MOUNTDIR/$UUID, where $MOUNTDIR is set in /etc/sysconfig/vchanger (or
> /etc/default/vchanger). By default, if not specified in
> /etc/sysconfig/vchanger, $MOUNTDIR=/mnt.
>
This is my /etc/sysconfig/vchanger:
[root@deneb vchanger]# cat /etc/sysconfig/vchanger
MOUNT_DIR=/mnt/vchanger
MOUNT_OPTIONS=
[root@deneb vchanger]#
Yes, the mount point is set to /mnt/vchanger.
> If vchanger-mount-uuid.sh is creating the mountpoint directory, but
> nothing is getting mounted, then most likely your udev is not configured to
> create the /dev/disk/by-uuid symlinks. The script relies on finding
> /dev/disk/by-uuid/$UUID, which is a symlink (created by udev rules)
> pointing to the actual device node assigned to the partition having that
> UUID.
>
>
To see if my udev is creating the symlinks for the device node to
/dev/disk/by-uuid, I edited the script vchanger-mount-uuid.sh to output
some information to a log file I call /tmp/vchtemp.log. Here's the portion
of the vchanger-mount-uuid.sh script that I made the changes just for
monitoring purposes:
74 # Mount under configured MOUNT_DIR
75 if [ ! -d $MOUNT_DIR/$uuid ]; then
76 mkdir -p $MOUNT_DIR/$uuid &>/dev/null
77 [ -d $MOUNT_DIR/$uuid ] || exit 0 # cannot create mountpoint
dir
78 chmod 0750 $MOUNT_DIR/$uuid
79 fi
80 echo checking dev
81 [ -e /dev/disk/by-uuid/$uuid ] || exit 0 # udev has no by-uuid
symlinks
82 echo "`date +"%b %d %T";ls -l /dev/disk/by-uuid`" >>
/tmp/vchtemp.log
83 mount $MOUNT_OPTIONS /dev/disk/by-uuid/$uuid $MOUNT_DIR/$uuid
&>/dev/null
84 mount | grep $uuid >> /tmp/vchtemp.log
85 if [ $? -eq 0 ] ; then
86 # On successful mount, cause update slots to be
issued in bconsole
87 /usr/bin/vchanger $cf refresh
88 echo `date +"%b %d %T"`": Done vchanger REFRESH" >>
/tmp/vchtemp.log
89 mount | grep $uuid >> /tmp/vchtemp.log
90 echo "Sleeping 10s..." >> /tmp/vchtemp.log
91 sleep 10
92 echo `date +"%b %d %T"` >> /tmp/vchtemp.log
93 mount | grep $uuid >> /tmp/vchtemp.log
94 echo "Done" >> /tmp/vchtemp.log
95 fi
96 exit 0
97 fi
98 fi
99 done
100 done
101 exit 0
Lines 82, 84, 88 - 94 are the ones that I added to output some additional
information to /tmp/vchtemp.log.
While inserting the "magazine", I watched the logs:
/var/log/vchanger/vchanger01.log and /tmp/vchtemp.log. Note, I set "log
level = 7" in /etc/vchanger/vchanger01.conf. Here's the output for
/var/log/vchanger/vchanger01.log:
May 12 12:15:48: created lockfile for pid 4533
May 12 12:15:48: magazine 0 has 18 volumes on
/mnt/vchanger/1fde15be-83a4-4b67-accc-378d5fa10ea7
May 12 12:15:48: update slots needed. magazine 0 has 18 volumes, previously
had 0
May 12 12:15:48: magazine 1 is not mounted
May 12 12:15:48: magazine 2 is not mounted
May 12 12:15:48: magazine 3 is not mounted
May 12 12:15:48: 18 volumes on magazine 0 assigned slots 1-18
May 12 12:15:48: saved state of magazine 0
May 12 12:15:48: saved dynamic configuration (max used slot: 37)
May 12 12:15:48: drive 0 previously unloaded
May 12 12:15:48: ==== preforming REFRESH command pid=4533
May 12 12:15:48: SUCCESS pid=4533
May 12 12:15:48: removing lockfile for pid 4533
May 12 12:15:48: created update lockfile for pid 4533
May 12 12:15:48: bconsole: running 'update slots storage="vchanger01"'
May 12 12:15:48: popen: child stdin uses pipe (5 -> 6)
May 12 12:15:48: popen: child stdout uses pipe (7 -> 8)
May 12 12:15:48: popen: forking now
May 12 12:15:48: popen: parent closing pipe ends 5,8,-1 used by child
May 12 12:15:48: popen: parent writes child's stdin to 6
May 12 12:15:48: popen: parent reads child's stdout from 7
May 12 12:15:48: popen: parent returning pid=4534 of child
May 12 12:15:48: popen: child closing pipe ends 6,7,-1 used by parent
May 12 12:15:48: popen: child will read stdin from 5
May 12 12:15:48: popen: child will write stdout to 8
May 12 12:15:48: popen: child executing '/usr/sbin/bconsole'
May 12 12:15:48: created lockfile for pid 4539
May 12 12:15:48: restored state of magazine 0
May 12 12:15:48: magazine 0 is not mounted
May 12 12:15:48: update slots needed. magazine 0 no longer mounted;
previous: 18 volumes in slots 1-18
May 12 12:15:48: magazine 1 is not mounted
May 12 12:15:48: magazine 2 is not mounted
May 12 12:15:48: magazine 3 is not mounted
May 12 12:15:48: saved dynamic configuration (max used slot: 37)
May 12 12:15:48: drive 0 previously unloaded
May 12 12:15:48: ==== preforming SLOTS command pid=4539
May 12 12:15:48: SUCCESS reporting 37 slots
May 12 12:15:48: removing lockfile for pid 4539
May 12 12:15:48: created lockfile for pid 4541
May 12 12:15:48: magazine 0 is not mounted
May 12 12:15:48: magazine 1 is not mounted
May 12 12:15:48: magazine 2 is not mounted
May 12 12:15:48: magazine 3 is not mounted
May 12 12:15:48: saved dynamic configuration (max used slot: 37)
May 12 12:15:48: drive 0 previously unloaded
May 12 12:15:48: ==== preforming LOADED command pid=4541
May 12 12:15:48: SUCCESS reporting drive 0 loaded from slot 0
May 12 12:15:48: removing lockfile for pid 4541
May 12 12:15:48: created lockfile for pid 4542
May 12 12:15:48: magazine 0 is not mounted
May 12 12:15:48: magazine 1 is not mounted
May 12 12:15:48: magazine 2 is not mounted
May 12 12:15:48: magazine 3 is not mounted
May 12 12:15:48: saved dynamic configuration (max used slot: 37)
May 12 12:15:48: drive 0 previously unloaded
May 12 12:15:48: ==== preforming LIST command pid=4542
May 12 12:15:48: SUCCESS sent list to stdout
May 12 12:15:48: removing lockfile for pid 4542
May 12 12:15:48: bconsole: output:
Connecting to Director deneb.pt.local:9101
1000 OK: 102 bacula-dir Version: 7.4.0 (16 January 2016)
Enter a period to cancel a command.
update slots storage="vchanger01"Automatically selected Catalog: MyCatalog
Using Catalog "MyCatalog"
Connecting to Storage daemon vchanger01 at deneb.pt.local:9103 ...
3306 Issuing autochanger "slots" command.
Device "SATA-vchanger01" has 37 slots.
Connecting to Storage daemon vchanger01 at deneb.pt.local:9103 ...
3306 Issuing autochanger "list" command.
No Volumes found to label, or no barcodes.
May 12 12:15:48: removed update lockfile for pid 4533
And, here is the output for /tmp/vchtemp.log:
May 12 12:15:48
total 0
lrwxrwxrwx 1 root root 10 May 12 12:15 1fde15be-83a4-4b67-accc-378d5fa10ea7
-> ../../sdb1
lrwxrwxrwx 1 root root 10 May 12 10:20 f08f9d6e-a4eb-42a1-8a62-566562ab5ea6
-> ../../sda3
lrwxrwxrwx 1 root root 10 May 12 10:20 f94bef3a-a7ed-4eca-ae1a-330076f36336
-> ../../sda2
lrwxrwxrwx 1 root root 10 May 12 10:20 fd490b6b-21cb-4b20-9ff8-f00832424501
-> ../../sda1
/dev/sdb1 on /mnt/vchanger/1fde15be-83a4-4b67-accc-378d5fa10ea7 type ext4
(rw,relatime,data=ordered)
May 12 12:15:48: Done vchanger REFRESH
/dev/sdb1 on /mnt/vchanger/1fde15be-83a4-4b67-accc-378d5fa10ea7 type ext4
(rw,relatime,data=ordered)
Sleeping 10s...
May 12 12:15:58
/dev/sdb1 on /mnt/vchanger/1fde15be-83a4-4b67-accc-378d5fa10ea7 type ext4
(rw,relatime,data=ordered)
Done
You can see that as I inserted the "magazine", udev DID created the dev
node ID /dev/sdb1. As the vchanger-mount-uuid.sh script runs, the
filesystem "1fde15be-83a4-4b67-accc-378d5fa10ea7" DID gets mounted as seen
by this line, which was output by line 84 mount | grep $uuid >>
/tmp/vchtemp.log:
/dev/sdb1 on /mnt/vchanger/1fde15be-83a4-4b67-accc-378d5fa10ea7 type ext4
(rw,relatime,data=ordered)
When the "/usr/bin/vchanger $cf refresh" line completes, the filesystem
"1fde15be-83a4-4b67-accc-378d5fa10ea7" was STILL mounted, as seen by these
lines:
May 12 12:15:48: Done vchanger REFRESH
/dev/sdb1 on /mnt/vchanger/1fde15be-83a4-4b67-accc-378d5fa10ea7 type ext4
(rw,relatime,data=ordered)
The lines after that are just for me to see if the filesystem was still
mounted after 10secs wait. Which, it reports as it still is mounted.
Howerver, on the other hand. from the /var/log/vchanger/vchanger01.log, I
can see that the magazine was initially mounted. Then, by the time
vchanger attempts to perform the REFRESH command, the magazine was already
dismounted:
May 12 12:15:48: created lockfile for pid 4533
May 12 12:15:48: magazine 0 has 18 volumes on
/mnt/vchanger/1fde15be-83a4-4b67-accc-378d5fa10ea7
May 12 12:15:48: update slots needed. magazine 0 has 18 volumes, previously
had 0
May 12 12:15:48: magazine 1 is not mounted
May 12 12:15:48: magazine 2 is not mounted
May 12 12:15:48: magazine 3 is not mounted
May 12 12:15:48: 18 volumes on magazine 0 assigned slots 1-18
May 12 12:15:48: saved state of magazine 0
May 12 12:15:48: saved dynamic configuration (max used slot: 37)
May 12 12:15:48: drive 0 previously unloaded
May 12 12:15:48: ==== preforming REFRESH command pid=4533
May 12 12:15:48: SUCCESS pid=4533
May 12 12:15:48: removing lockfile for pid 4533
May 12 12:15:48: created update lockfile for pid 4533
May 12 12:15:48: bconsole: running 'update slots storage="vchanger01"'
May 12 12:15:48: popen: child stdin uses pipe (5 -> 6)
May 12 12:15:48: popen: child stdout uses pipe (7 -> 8)
May 12 12:15:48: popen: forking now
May 12 12:15:48: popen: parent closing pipe ends 5,8,-1 used by child
May 12 12:15:48: popen: parent writes child's stdin to 6
May 12 12:15:48: popen: parent reads child's stdout from 7
May 12 12:15:48: popen: parent returning pid=4534 of child
May 12 12:15:48: popen: child closing pipe ends 6,7,-1 used by parent
May 12 12:15:48: popen: child will read stdin from 5
May 12 12:15:48: popen: child will write stdout to 8
May 12 12:15:48: popen: child executing '/usr/sbin/bconsole'
May 12 12:15:48: created lockfile for pid 4539
May 12 12:15:48: restored state of magazine 0
May 12 12:15:48: magazine 0 is not mounted
May 12 12:15:48: update slots needed. magazine 0 no longer mounted;
previous: 18 volumes in slots 1-18 <==== Here magazine 0 was no longer
mounted
May 12 12:15:48: magazine 1 is not mounted
May 12 12:15:48: magazine 2 is not mounted
May 12 12:15:48: magazine 3 is not mounted
May 12 12:15:48: saved dynamic configuration (max used slot: 37)
May 12 12:15:48: drive 0 previously unloaded
I don't know what's going on behind udev - the filesystem was mounted, but
immediately, it gets unmounted. May be someone can shed some light to this
mystery.
Thanks again.
Pann
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