This is similar, but an enhanced version of my custom_mount.sh previously published here: Bash: Automatically Mount File Systems on Volume Group if Present. This previous version was just a simple init script. This updated version is designed for newer Linux distributions that use Systemd instead of Init.
The Code
The majority of the work is done by dvgmounter.sh. It will check if the Volume Group is present, if it is it will parse the /etc/fstab file looking for entries that are marked noauto, then it will test if that file system is already mounted, if it is not it will mount it.
#!/bin/bash
# description: Will automatically mount a removable device if present.
#
#: Script Name : dvgmounter.sh
#: Version : 1.0.4.1
#: Author : Matthew Mattoon - http://blog.allanglesit.com
#: Date Created : August 15, 2012
#: Date Updated : September 14, 2015
#: Description : Automount Removable Logical Volumes Script.
#: Examples : dvgmounter.sh ACTION VGNAME
#: : dvgmounter.sh start data_vg
vgtest=$2
vgs=`vgs | grep $vgtest`
start() {
if [ -n "$vgs" ]; then
echo "Logical Volume Group: $vgtest present."
mounts=`cat /etc/fstab | grep $vgtest | grep noauto | tr '\t' ' ' | tr -s ' ' | cut -d " " -f 2`
for mount in $mounts
do
if [ -z "`mount | grep $mount`" ]; then
echo "Mounting $mount file system..."
mount $mount
else
echo "File system $mount is already mounted..."
fi
done
else
echo "Logical Volume Group: $vgtest not present."
exit 1
fi
}
stop() {
if [ -n "$vgs" ]; then
echo "Logical Volume Group: $vgtest present."
mounts=`cat /etc/fstab | grep $vgtest | grep noauto | tr '\t' ' ' | tr -s ' ' | cut -d " " -f 2`
for mount in $mounts
do
if [ -n "`mount | grep $mount`" ]; then
echo "Unmounting $mount file system..."
umount $mount
else
echo "File system $mount is already unmounted..."
fi
done
else
echo "Logical Volume Group: $vgtest not present."
exit 1
fi
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
sleep 2
start
;;
*)
echo "Usage: $0 start|stop|restart"
exit 1
esac
Here is what I have for LVM.
# vgs VG #PV #LV #SN Attr VSize VFree laptop_vg 1 4 0 wz--n- 237.98g 26.44g data_vg 1 4 0 wz--n- 298.09g 18.09g # lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert home laptop_vg -wi-ao---- 97.66g localvm_lv laptop_vg -wi-ao---- 60.00g root laptop_vg -wi-ao---- 50.00g swap laptop_vg -wi-ao---- 3.89g disk_lv data_vg -wi-ao---- 60.00g downloads_lv data_vg -wi-ao---- 50.00g iso_lv data_vg -wi-ao---- 20.00g movies_lv data_vg -wi-ao---- 150.00g
Here is the snipped contents of my /etc/fstab.
# cat /etc/fstab ... /dev/mapper/data_vg-iso_lv /vbox/iso ext4 noauto 1 2 /dev/mapper/data_vg-disk_lv /vbox/disk ext4 noauto 1 2 /dev/mapper/data_vg-movies_lv /home/matthew/movies ext4 noauto 1 2 /dev/mapper/data_vg-downloads_lv /home/matthew/Downloads ext4 noauto 1 2 ...
Creating the Service
We just need to put some details into a service file, since this particular script is a one time run then we need to tell Systemd that this is a “oneshot” and that we want it to “RemainAfterExit” so that it doesn’t put the service into a failed state when it completes its work and stops running.
# cat /lib/systemd/system/dvgmount.service [Unit] Description=Dynamic Volume Group Mounter [Service] Type=oneshot ExecStart=/opt/dvgmounter/dvgmounter.sh start data_vg ExecStop=/opt/dvgmounter/dvgmounter.sh stop data_vg RemainAfterExit=yes [Install] WantedBy=multi-user.target
Then we need to link that service file into Systemd’s configuration, so that it can transact with it.
# pwd /etc/systemd/system # ln -s /lib/systemd/system/dvgmount.service
Whenever you make changes to services you will need to reload the daemons into Systemd.
# systemctl daemon-reload
Then starting the service is simple enough.
# systemctl start dvgmount.service
Lets check status and make sure that this worked properly before making the changes permanent.
# systemctl status dvgmount.service ● dvgmount.service - Dynamic Volume Group Mounter Loaded: loaded (/lib/systemd/system/dvgmount.service; enabled; vendor preset: disabled) Active: active (exited) since Mon 2015-09-14 15:50:57 CDT; 10min ago Main PID: 24178 (code=exited, status=0/SUCCESS) CGroup: /system.slice/dvgmount.service Sep 14 15:50:57 laptop systemd[1]: Starting Dynamic Volume Group Mounter... Sep 14 15:50:57 laptop dvgmounter.sh[24178]: Logical Volume Group: mattoondata_vg present. Sep 14 15:50:57 laptop dvgmounter.sh[24178]: Mounting /vbox/iso file system... Sep 14 15:50:57 laptop dvgmounter.sh[24178]: Mounting /vbox/disk file system... Sep 14 15:50:57 laptop dvgmounter.sh[24178]: Mounting /home/matthew/movies file system... Sep 14 15:50:57 laptop dvgmounter.sh[24178]: Mounting /home/matthew/Downloads file system... Sep 14 15:50:57 laptop systemd[1]: Started Dynamic Volume Group Mounter.
Finally lets tell Systemd that this should be evaluated as part of its system startup. This will make the changes permanent.
# systemctl enable dvgmount.service Created symlink from /etc/systemd/system/multi-user.target.wants/dvgmount.service to /usr/lib/systemd/system/dvgmount.service.
That does it. This should solve this one for some time!