Hi UrBackup Community,
I never got image mounting to work until tody so I decided to give those of you who are still having troubles a small guide. I haven’t found a post here that covered all the steps (though there was not much to do really).
First of all: I’m running urbackup on a ubuntu server 17.10 and I’m using btrfs for my storage with raw image files. Also urbackup server runs in the default configuration with urbackup user.
Step 1: Change permissions on kernel
sudo chmod 0644 /boot/vmlinuz* (see http://libguestfs.org/guestfs-faq.1.html)
Step 2: Add urbackup user to kvm group
sudo usermod -a -G kvm urbackup (see http://libguestfs.org/guestfs-faq.1.html)
Step 3: Mount image from CLI as root
sudo urbackup_mount_helper mount <CLIENT> <CLIENT_FOLDER> <CLIENT_IMAGE>.raw
Step 4: Unmount image from CLI as root
sudo urbackup_mount_helper umount <CLIENT> <CLIENT_FOLDER> <CLIENT_IMAGE>.raw
Step 5: Mount image from CLI as urbackup
sudo -u urbackup urbackup_mount_helper mount <CLIENT> <CLIENT_FOLDER> <CLIENT_IMAGE>.raw (see UrBackup Server 2.1.6 beta)
Step 6: Unmount image from CLI as urbackup
sudo -u urbackup urbackup_mount_helper umount <CLIENT> <CLIENT_FOLDER> <CLIENT_IMAGE>.raw
Step 7: Mount image from Web Interface
For some reason mounting as root enabled the urbackup user as well to mount images. Step 5 did produce a “supermin exited with error code 1” before that. Steps 5 and 6 are most likely not required, but thats just what I did for testing.
I will check if mounting will now also work for different images and also after a reboot. It most likely won’t work after a kernel update since the default permissions under ubuntu are too restrictive.
I hope I could help someone with this post.
Cheers,
Thomas