[cochiselinux] dd and ssh for remote backups/default installations
- From: "Prevett, Larry" <Prevettl@xxxxxxxxxxx>
- To: <cochiselinux@xxxxxxxxxxxxx>
- Date: Mon, 29 Mar 2004 17:56:52 -0700
We've been looking for a way to do remote backups and default =
installations
for the machines in the labs. This is important for getting the =
math/science software reinstalled after Linux is installed in the =
'Installing and Using' class. Common installations are also important =
for clustering because the programs and data all have to be in the same =
place on the hard drives.
We tried Norton Ghost and it copied everything but the boot loader ....
dd + ssh works great.
Use caution - try these commands out on some old hard drive you don't=20
need to make sure they do what you want first.
use dumpe2fs -h /dev/hda1, etc. to determine block sizes of partitions
(for this example bs=3D4096)
=
=20
# on all clients on private network
boot with Quantian CD (or other Knoppix CD) which runs sshd.
su -
passwd (ssh config disallows empty pwd connection)
ifconfig eth0 192.168.86.1
route add default gw 192.168.86.1
=
=20
# on machine with master hard drive image
dd if=3D/dev/hda bs=3D4096 | (ssh2 root@xxxxxxxxxxxx dd of=3D/dev/hda =
obs=3D4096)
enter password, ctrl-z, bg 1, do the next one ...
=
(could automate this with public =
ssh keys)
Bad news: takes 6hrs to copy a 60Gb drive(!)
(block size doesn't seem to make a difference
to speed things up could skip free blocks - working on that) =
=20
=
=20
Good news: to copy to 10 machines only takes 13hrs
So we could install FreeBSD on every machine on a Sunday night meeting,
start the copy before we leave, machines would be ready to go in the =
morning.
Since this is a binary image, no need to partition anything,
even for dual/boot installations.
dd is very flexible. Other ideas from internet, O'Reilly books:
# go the other way: copy first partition from remote machine to local =
drive
ssh2 root@xxxxxxxxxxxx "dd if=3D/dev/hda1 bs=3D512" | cat - > /dev/hda1
# backup master boot record on remote machine to local file mbr.bin
ssh2 root@xxxxxxxxxxxx "dd if=3D/dev/hda bs=3D512" count=3D1 | cat - > =
mbr.bin
# copy mbr.bin back to remote machine
dd if=3Dmbr.bin bs=3D512 | (ssh root@xxxxxxxxxxxx dd of=3D/dev/hda =
obs=3D512)
stuff like that.
lp
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