yum源优先级设置

1.安装 yum-priorities //事先查看是否已安装  rpm -q yum-priorities
#yum install yum-priorities -y

2.priorities的配置文件是/etc/yum/pluginconf.d/priorities.conf，确认其是否存在。内容为：
#cat /etc/yum/pluginconf.d/priorities.conf
[main]
enabled = 1 # 0禁用 1启用

3.编辑 /etc/yum.repos.d/目录下的*.repo 文件来设置优先级。参数为：

　　priority=N # N值为1-99，数字越大,优先级越低

★推荐的设置为：
[base], [addons], [updates], [extras] … priority=1
[centosplus],[contrib] … priority=2
Third Party Repos such as rpmforge … priority=N (where N is > 10 and based on your preference)
例：
echo "priority=1" >> CentOS7.repo

例：编辑 /etc/yum.repos.d/目录下的*.repo 文件来设置优先级

[base]
name=CentOS-$releasever – Base
baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=0
priority=1