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Old 09-29-2012, 03:36 AM   #1
Kropotkin
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dump | restore root to live partition?


I would like to migrate a FreeBSD server to a VPS, and I am wondering whether it is possible to move root to a live partition, doing something like this:
Code:
dump -0uanL -f - /dev/sd0s1a | ssh user@0.0.0.0 "restore rf -"
Since it is a VPS, I have no way of taking the root partition of the target system offline.

Obviously, before rebooting, I would need to configure /etc/fstab and /etc/rc.conf for the new host.

Would this work?
 
Old 09-29-2012, 07:56 PM   #2
rknichols
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Sounds to me like a recipe for major filesystem corruption and crash of the target system.
 
Old 10-02-2012, 03:24 PM   #3
Kropotkin
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OK, I am sure you right. Just thought I'd ask.

Perhaps there is a way of creating a separate partition on a VPS, restoring thd dump image to that, and booting from it. I will investigate further.
 
Old 10-02-2012, 08:40 PM   #4
rknichols
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With LVM you could probably do it by creating a snapshot, reconfiguring to boot from the snapshot, doing the restore to the origin volume, then making the necessary adjustments there for the new host and booting from the origin volume. Not the sort of thing I'd want to try on a machine much more than an arm's length away, though, and you'd have to be already using LVM to do it.
 
Old 10-03-2012, 01:38 AM   #5
fbsduser
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Quote:
Originally Posted by rknichols View Post
With LVM you could probably do it by creating a snapshot, reconfiguring to boot from the snapshot, doing the restore to the origin volume, then making the necessary adjustments there for the new host and booting from the origin volume. Not the sort of thing I'd want to try on a machine much more than an arm's length away, though, and you'd have to be already using LVM to do it.
I don't know if he will be able to use LVM (since it's a Linux-centric feature and he's using a BSD system). He will get what he requires by using the zfs filesystem, since it does snapshots (and a lot more), and BSD supports it.
 
Old 10-03-2012, 09:23 AM   #6
rknichols
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Quote:
Originally Posted by fbsduser View Post
I don't know if he will be able to use LVM (since it's a Linux-centric feature and he's using a BSD system).
Apparently NetBSD has an implementation of LVM. Don't know what BSD variant the OP might be using.
 
  


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