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Re: [Bacula-users] vchanger 1.0.1 says "No slots in changer to scan"
2016-05-06 07:41:10
On 5/6/2016 3:07 AM, Pann Tolk wrote:
Hi Josh,
Udev expects any scripts launched by udev rules to execute quickly
and not cause delays, therefore the vchanger-launch-mount.sh script
launched by udev simply causes the
/usr/libexec/vchanger/vchanger-mount-uuid.sh script to be invoked as
a background process and then terminates. So a success simply means
that vchanger-launch-maount.sh successfully invoked
vchanger-mount-uuid.sh in a background process, not that it mounted
successfully.
The default mountdir is /mnt. To mount under say /mnt/vchanger it is
necessary to set MOUNTDIR=/mnt/vchanger in /etc/sysconfig/vchanger.
Alternatively, you can use a line like
UUID=1fde15be-83a4-4b67-accc-378d5fa10ea7
/any/existing/directory/name ext4
defaults,rw,relatime,data="" 0 0
in /etc/fstab to cause vchanger-mount-uuid.sh to mount it wherever
you like. When specified as magazine=uuid:, vchanger will lookup the
mountpoint using libudev and so doesn't really care where it gets
mounted. When using magazine=/some/static/path, it must be mounted
at the specified path.
You can umount the partition and then run vchanger-mount-uuid.sh (as
root) with the uuid as its only parameter to see what it does.
Unfortunately, the script is very simple and doesn't provide
logging.
No. /usr/libexec/vchanger/vchanger-mount-uuid.sh does. If mount info
for the partition is not specified by uuid in /etc/fstab, then it
mounts it at $MOUNTDIR/$1, where $1 is the filesystem UUID. So you
can use mount | grep 1fde15be-83a4-4b67-accc-378d5fa10ea7
to find it.
So vchanger is working properly when run as root. What does it do
when you run that same command as user bacula:tape? Are you sure
bacula-sd is running as user bacula:tape? vchanger must run as the
same user as bacula-sd. It could still be a permissions issue. You
can set 'log level = 7' and 'logfile = /path/to/logfile' in
vchanger.conf to debug vchanger, but you must run it as user
bacula:tape to debug if it is a permissions issue.
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