如何在Redhat 7上执行yum降级
例如，我们要降级ambari-agent pkg
yum history
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ID | Command line | Date and time | Action(s) | Altered
-------------------------------------------------------------------------------
32 | -y upgrade ambari-agent | 2018-03-20 06:10 | Update | 1 EE
您可以通过撤消最新的升级来简单地降级（在这种情况下为32）：
yum history undo 32
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