• Backups

Backups

I'm using duplicity for backups. I'm trying to back up every single machine to milkweed, an old box with a lot of disk. So far so good.

Adding a Box

• get the install-backup.sh script on the client end.

• run it and leave the SSH key visible on the screen.
• open a new xterm and ssh to milkweed.

• run /root/setup_server.sh clientname (eg  ./setup_server.sh edison1 )

• paste the SSH key from the client into the screen (this is a vi session editing the correct authorized_keys file on milkweed)

Restoring A Full System With Duplicity

• partition and mount the empty filesystem
• make a new ssh key to access the duplicity volumes
• make sure duplicity has --numeric-owner patch

• use --numeric-owner

• use --scp-command "scp -i path-to-identity-file" and --sftp-command "sftp -o IdentityFile=path-to-identity-file".

• test with collection-status

• use --force to overwrite existing directories, AKA mount points

• make a script of your duplicity command because it will be very long
• run it
• chroot to the new system
• make a /proc,/dev,/dev/shm,/dev/pts and any other missing mountpoints.

KEY=/root/for_dev1_restore
FROM=dev2
TO=dev1

duplicity restore -v4 \
    --no-encryption \
    --numeric-owner \
    --scp-command "scp -i $KEY" \
    --sftp-command "sftp -o IdentityFile=$KEY" \
    --force \
    scp://$FROM@milkweed//home/backups/$FROM/duplicity \
    /mnt/$TO

Restoring a Bare-Metal Backup to Xen

• restore backup to disk on Xen host (see above)
• cp -a /dev/mapper/hostname* /mnt/hostname/dev/mapper
• cp -a /dev/hostname /mnt/hostname/dev
• chroot to backup
• mount /proc and /sys
• fix /etc/modprobe.conf like so:

   alias eth0 xennet
   alias scsi_hostadapter xenblk

• check and fix /etc/fstab - look out for vg name
• make sure grub.conf has correct root= value. Watch out for vg in particular
• add console=xvc0 to kernel args in grub.conf

• add "co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav" to /etc/inittab

• in /etc/sysctl.conf set xen.independent_wallclock = 1
• use rpm to remove all kernels
• use yum to install kernel-xen
• this should give a new initrd that should work.. if not, use mkinitrd

Restoring a Single User's Home Dir With Duplicity

duplicity restore scp://edison2@milkweed/duplicity /home/webusrs/jdoe0001 -v4 --file-to-restore home/webusrs/jdoe0001 --no-encryption -t 2009-01-22T12:00:00-08:00 | tee restore.out

When do they do their thing?