centos replace yum source

Centos source is changed to 163 or Alibaba.

1. Backup first
mv /etc/yum.repos.d/Centos-Base.repo /etc/yum.repos.d/Centos-Base.repo.backup

2. Download the repo file to the directory
cd /etc/yum.repos.d
wget
3. yum clean all //Clear cache
yum makecache //Generate a new cache

163 and aliyun mirror:

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