Kees Cook: yay for barriers

Posted May 18, 2010 20:45 UTC (Tue) by cry_regarder (subscriber, #50545)
In reply to: Kees Cook: yay for barriers by mjthayer
Parent article: Kees Cook: yay for barriers

Yes. yum upgrade does this. After it is done, you may have some checking for orphans to do, especially if you have custom packages.

preupgrade is just like a dvd upgrade but it doesn't require you to burn media to reboot into. It does a bunch of work while the system is online, then when you are ready, you trigger the offline upgrade. In my experience, you are looking at maybe an hour offline depending on the machine and internet connection.

Cry

Kees Cook: yay for barriers

Posted May 19, 2010 8:07 UTC (Wed) by michich (guest, #17902) [Link]

preupgrade is just like a dvd upgrade but it doesn't require you to burn media to reboot into.

There's one more difference and it's even more important: preupgrade takes post-release updates into account:

preupgrade takes you from (F<n> + F<n>-updates) to (F<n+1> + F<n+1>-updates), which is great.
DVD upgrade takes you from (F<n> + F<n>-updates) to F<n+1> only, which is broken by design.

In my experience the methods to upgrade a Fedora installation ordered from the most reliable to the least reliable are:

yum update in a running system (BUT one must know what he's doing and must read http://fedoraproject.org/wiki/YumUpgradeFaq!)
preupgrade (It's very easy to use and requires almost no thinking. I only put it in the second place because I encountered bugs in the past, fixed since then.)
(separated by a large margin:) using anaconda from the DVD

Note that I realize well that official documentation disagress with me.