I mount the installation DVD image for my distribution with loopback mount so that I don't have to download packages if they are on the ISO image and up to date. To do this I have a line in /etc/fstab that looks like this:
/home/data/software/opensuse/openSUSE-Leap-42.2-DVD-x86_64.iso /srv/www/htdocs/42.2 iso9660 auto,ro,loop
The problem with this is that if for some reason the mount fails, say the ISO file has been renamed, or somehow the directory of the image or mountpoint are inaccessible, the boot process fails.
Enter the nofail option of systemd.mount. If the line is changed to this:
/home/data/software/opensuse/openSUSE-Leap-42.2-DVD-x86_64.iso /srv/www/htdocs/42.2 iso9660 auto,ro,loop,nofail,x-systemd.device-timeout=10
this prevents failure to mount from affecting the boot process. The problem can then be investigated after the machine has started up. The option x-systemd.device-timeout=10 specifies a shorter timeout than the default.
/home/data/software/opensuse/openSUSE-Leap-42.2-DVD-x86_64.iso /srv/www/htdocs/42.2 iso9660 auto,ro,loop
The problem with this is that if for some reason the mount fails, say the ISO file has been renamed, or somehow the directory of the image or mountpoint are inaccessible, the boot process fails.
Enter the nofail option of systemd.mount. If the line is changed to this:
/home/data/software/opensuse/openSUSE-Leap-42.2-DVD-x86_64.iso /srv/www/htdocs/42.2 iso9660 auto,ro,loop,nofail,x-systemd.device-timeout=10
this prevents failure to mount from affecting the boot process. The problem can then be investigated after the machine has started up. The option x-systemd.device-timeout=10 specifies a shorter timeout than the default.
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