?　　yum源自定義優先級，提高下載速速！

01、Install Yum Priorities

Run the Yum Priorities install command
yum install yum-priorities

02、Configure Yum Priorities

Open the Yum Priorities configuration file
/etc/yum/pluginconf.d/priorities.conf

Ensure the following lines exist
[main]
enabled=1

Save and close the file

Open the CentOS base repository configuration file
/etc/yum.repos.d/CentOS-Base.repo

Add the following text to the end of the Base, Updates, Addons, and Extras repository entries*
priority=1?????????? #優先級高于2，越小優先級越高

Add the following text to the end of the CentOSPlus repository entry*
priority=2

?

借鑒：http://cnzhx.net/blog/yum-priorities/

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