Configuring the Yum Source

Use PuTTY to log in to the server as the root user.

Configure the Yum source.

Open the CentOS-Base.repo file.
```
vi /etc/yum.repos.d/CentOS-Base.repo
```

Press i to enter the insert mode. Delete the existing content and add the following content:

[BaseOS]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=BaseOS&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$releasever/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

Press Esc, type :wq!, and press Enter to save the file and exit.

Clear the cache.
```
yum clean all
```
Refresh the cache.
```
yum makecache
```

Parent topic: Configuring the Compilation Environment