On 01/28/2013 01:05 PM, xrx wrote: > On 01/28/13 21:27, James A. Peltier wrote: >> ----- Original Message ----- >> | Does anyone know of any sort of Linux utility that does something >> | like >> | what Solaris' Live Upgrade >> | (http://docs.oracle.com/cd/E19455-01/806-7933/index.html) does? >> | >> | In my past life as a Solaris sys-admin, I found this an extremely >> | useful >> | tool for upgrading and patching running systems, as well as for >> | maintaining redundant boot environments on separate system disks for >> | disaster situations. >> >> Nothing really until BTRFS comes of age. I suppose you could snapshot your LVM volumes before performing the upgrade but to my knowledge there is nothing similar to Live Upgrade for CentOS >> > It does sound like you can do the roughly the same with LVM snapshots. > Reading the introduction of the solaris document you linked; it seems as > if the solaris upgrade is applied on say a snapshot; and then the system > is rebooted into the upgraded environment; and if it works, great, if > not you need a reboot back into the original state. > > Wheras with CentOS 6; you take a snapshot of the root partition (easy as > "lvcreate --snapshot --name RootSnapshot --size 2G /dev/VolGroup/Root"), > and then do an upgrade with a reboot. If it works; you're set, if not, > just revert back to the snapshot (lvconvert --merge > VolGroup/RootSnapshot) and reboot; you'd be back to the state before the > upgrade. Thanks. You also need to manage the grub and fstab configurations to allow the second boot environment to be visible, bootable, and mountable. -- Tim Evans | 5 Chestnut Court Linux/UNIX Consulting | Owings Mills, MD 21117 http://www.tkevans.com/ | 443-394-3864 http://www.come-here.com/News/ | tkevans at tkevans.com