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Old 23rd July 2009, 10:03 PM
Oponium Offline
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yum update vs upgrade


I was just wondering what the difference is between yum upgrade and yum update. Which one is recommended?

I noticed that yum update uses Presto, but I couldn't find if yum upgrade uses Presto (I'm assuming no).

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Old 23rd July 2009, 10:09 PM
William Haller Offline
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Yum upgrade is used when upgrading between releases of Fedora (F10 -> F11 for example). It relaxes some constraints as I understand it. Yum update is used for normal release maintenance.

As far as I know, upgrade (F10 -> F11) didn't have a presto release, although I hope F11 to F12 will.
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Old 23rd July 2009, 10:45 PM
CSchwangler Offline
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Sorry to correct you. Update, as I understand it, brings installed packages up-to-date. Upgrade, on the other hand, does the same as update, but also deinstalls obsolete packages. Upgrade is not only for version upgrades, e.g. F10 to F11 (what you probably mean is pre-upgrade). I prefer upgrade, because it removes obsolete packages.
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Old 23rd July 2009, 11:28 PM
AdamW Offline
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I've been told that, in fact, in the current code, they do exactly the same thing. I thought the same thing as Cschwangler, as that's what the manpage says, but apparently it's no longer accurate. They both do what 'upgrade' used to do; there's no longer any difference between them.
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Old 23rd July 2009, 11:54 PM
CSchwangler Offline
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Thanks for the update, AdamW. Its good to know that both do the same thing.
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Old 24th July 2009, 02:35 AM
nirik Offline
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The do the exact same thing, unless you have modified the 'obsoletes' setting in yum.conf.

1 is the default and they are the same and both do obsoletes.
0 means that upgrade does handle obsoletes, and update does not.
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update, upgrade, yum

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