FSF France machines management - Cookbook: recipe #321, Howto resurect a Ganeti node

recipe #321, HowTo: Howto resurect a Ganeti node

Assuming a full backup of the NODE ganeti node exists on backup.tld, here are the steps to resurect it on a new disk:

• boot on a live CD with the same architecture as NODE
• fdisk /dev/sda
• create sda1 root 20GB, sda2 swap XGB (amount of RAM), sda3 LVM
• reboot so that it is taken into account (in case it is ignored * * because the disk is considered active, fdisk will tell)
• mke2fs -j /dev/sda1 ; tune2fs -i 300 -c 300 -m 0 /dev/sda1
• ssh-keygen + copy the key over on backup.tld authorized_keys
• mount /dev/sda1 /mnt
• rsync -avH --numeric-ids backup.tld:/NODE/ /mnt/
• vi /mnt/etc/network/interface and add iface eth0 inet dhcp
• chroot /mnt
• grub-install /dev/sda
• vgreduce --removemissing all
• vgremove all
• pvremove /dev/XXX (this is assuming the disk layout on the new machine is different from the one on the previous machine)
• reboot
• fix root= on the grub menu to /dev/sda1

after boot update-grub

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