This is a two headed problem.
For the last decade+ I streamed dd of a partition to gzip to create compressed images in my automated backup scripts for servers.
e.g. dd if=/dev/sdX1 | gzip -c sdX1.img.gz etc.
That obviously works stellar, but I rather want to move to squashfs in order that I can read contents of the backup faster.
The squashfs status is as follows:
Currently you cannot do just
dd if=/dev/sdX1 | squashfs -c etc.
In order to stream dd to a squashfs is a convoluted non sensical non-pipe command as follows
mksquashfs squash.img -p ‘sde5_backup.img f 444 root root dd if=/dev/sdX1 bs=4M’
Anyone know of a way to PIPE dd to squasfs without the nonsensical example above (which does work) ?
Once I created a squashfs there is seemingly no way to mount the image inside the squash filesystem
Here is what I did (assume my partition to be backed up is /dev/sde5)
$] mksquashfs squash.img -p 'sde5_backup.img f 444 root root dd if=/dev/sde5 bs=4M' $] ls -l -rw-r--r-- 1 root root 2039283712 Mar 4 01:54 squash.img drwxr-xr-x 2 root root 38 Mar 4 01:46 TEMP drwxr-xr-x 2 root root 4096 Mar 4 02:04 TEMP1
So the squashed image was created.
Now to mount this squashed image I do
mount squash.img TEMP
I then check to see what is in TEMP and find
$] ls -l TEMP total 2960966 -r--r--r-- 1 root root 4819981824 Mar 4 01:47 sde5_backup.img
So clearly the squashed file system is mounted and I can see the image of the disk.
Now to mount this diskimage fails.
$] mount TEMP/sde5_backup.img TEMP1 mount: /archive/TEMPDIR/TEMP1: cannot mount /dev/loop1 read-only.
$] mount -o loop TEMP/sde5_backup.img TEMP1 mount: /archive/TEMPDIR/TEMP1: cannot mount /dev/loop1 read-only
Why am I unable to mount the image inside the squashfs.?
Looking around the web, everyone seems to be able to just mount it but not on my servers.
What am I missing ?