> I am still running Wheezy and would like to test Jessie before committing to
> it. Is a chroot a viable method? If so, can someone point me to a link on
> how best to set it up and use it. I will want to test it with, and without,
> systemd. Would a dual boot be a better way to test this?
Given the recent discussion about LVM, here's how I've done it recently:
- create new LVM volume to hold a backup of the current system.
I typically have a "root" LVM volume which holds the OS, and I make
the backup volume as a snapshot (so the copying is done lazily):
lvcreate --name wheezy --size 10G --snapshot /dev/mapper/<My-VG>-root
[ The size can be smaller than that of "root" (it will only need to
hold those chunks which are modified), but if you have enough space,
I recommend you make the size just as large as "root" to avoid
losing/corrupting this snapshot if you end up writing more chunks than
expected. ]
- perform the upgrade.
- whenever you want/need to look at or use the older system, you can
either mount /dev/mapper/<My-VG>-wheezy (and maybe chroot into it), or
reboot into it (at the Grub prompt, edit the "linux" line so that it
uses "root=/dev/mapper/<My-VG>-wheezy").
- if you just want to revert to the original state, you can use
"lvconvert --merge /dev/mapper/<My-VG>-wheezy".
Stefan
