Rollback

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> yum history

Loaded plugins: product-id, security, subscription-manager
This system is receiving updates from Red Hat Subscription Management.
ID     | Login user          | Date and time    | Action(s)    | Altered
-------------------------------------------------------------------------------
     5 | root <root>         | 2014-11-21 14:13 | D, E         |  145   
     4 | root <root>         | 2014-11-21 14:07 | Update       |    1   
     3 | root <root>         | 2014-11-21 14:06 | Downgrade    |    1   
     2 | root <root>         | 2014-11-21 10:59 | I, U         |  145   
     1 | System <unset>      | 2014-11-21 09:23 | Install      |  731   
history list

Repérer la date du changement et faire

> yum history undo 2