首先在這個**可以找到相關yum原始碼配置方法：
centos
1、備份
centos 5
wget -o /etc/yum.repos.d/centos-base.repo
或者curl -o /etc/yum.repos.d/centos-base.repo
centos 6
wget -o /etc/yum.repos.d/centos-base.repo
或者curl -o /etc/yum.repos.d/centos-base.repo
centos 7
wget -o /etc/yum.repos.d/centos-base.repo
或者curl -o /etc/yum.repos.d/centos-base.repo
3、之後執行yum makecache生成快取
1、備份sources.list
cp /etc/apt/sources.list /etc/apt/sources.list_backupdeb-src xenial main restricted #added by software-properties
deb xenial main restricted
deb-src xenial main restricted multiverse universe #added by software-properties
deb xenial-updates main restricted
deb-src xenial-updates main restricted multiverse universe #added by software-properties
deb xenial universe
deb xenial-updates universe
deb xenial multiverse
deb xenial-updates multiverse
deb xenial-backports main restricted universe multiverse
deb-src xenial-backports main restricted universe multiverse #added by software-properties
deb xenial partner
deb-src xenial partner
deb xenial-security main restricted
deb-src xenial-security main restricted multiverse universe #added by software-properties
deb xenial-security universe
deb xenial-security multiverse
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