Tim Evans wrote: > On 01/28/2013 01:05 PM, xrx wrote: >> On 01/28/13 21:27, James A. Peltier wrote: >>> | 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? <snip> >>> 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. <snip> >> 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. Actually, what we do, such as the upgrade from 5 to 6, is to create /boot/new and /new, rsync from an updated machine, then copy over /etc/sysconfig/network-scripts/ifcfg-eth* to the new, the /etc/ssh to the new, /etc/fstab, and, oh, yes, /etc/grub.d/rules/70-persistant-net.rules; then using zsh's files/modules(?) load that shell into memory, them create /boot/old and /old, move * old, mv lost+found, and /root back, then mv new/* ., Check /etc/grub.conf, and reboot. If we need to go back - and we did on several, when we found out the speed issues to NFS-mounted home directories - mv * new, mv old/* ., sync, and reboot. mark mark