linux如何配置yum源，yum的配置

yum的配置
[root@localhost ~]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# ls
CentOS-Base.repo CentOS-Debuginfo.repo CentOS-Media.repo
CentOS-Vault.repo CentOS-CR.repo CentOS-fasttrack.repo
CentOS-Sources.repo
[root@localhost yum.repos.d]# mkdir bak
[root@localhost yum.repos.d]# mv CentOS-* bak
[root@localhost yum.repos.d]# ls
bak
[root@localhost yum.repos.d]# cd bak
[root@localhost bak]# ls
CentOS-Base.repo CentOS-fasttrack.repo CentOS-Sources.repo
CentOS-CR.repo CentOS-Media.repo CentOS-Vault.repo
[root@localhost bak]#cd …
[root@localhost yum.repos.d]# mv bak/CentOS-Debuginfo.repo .
[root@localhost yum.repos.d]# ls
bak CentOS-Debuginfo.repo
[root@localhost yum.repos.d]# vi CentOS-Debuginfo.repo
[base-debuginfo]
name=CentOS-7 - Debuginfo
baseurl=file:///mnt
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-Debug-7
enabled=1
[root@localhost yum.repos.d]#yum clean all
[root@localhost yum.repos.d]#yum makecache