本地的配置文件爲local.repo，新建的配置文件需要注意，“[]”裏面的名字需要注意順序，如本地local.repo文件裏面的爲[development]，則新建的配置文件需要優先被建立緩存的時候，需要在[]中的名字優先被讀取，如[a],[develop]......等等
yum緩存建立的順序導致文件安裝失敗，下面是正確的
[root@localhost yum.repos.d]# yum -y clean all
Loaded plugins: fastestmirror, refresh-packagekit, security
Cleaning repos: devel development
Cleaning up Everything
Cleaning up list of fastest mirrors
[root@localhost yum.repos.d]# yum makecache
Loaded plugins: fastestmirror, refresh-packagekit, security
Determining fastest mirrors
devel | 2.9 kB 00:00 ...
devel/filelists_db | 33 kB 00:00 ...
devel/primary_db | 68 kB 00:00 ...
devel/other_db | 17 kB 00:00 ...
development | 4.0 kB 00:00 ...
development/group_gz | 220 kB 00:00 ...
development/filelists_db | 5.8 MB 00:00 ...
development/primary_db | 4.4 MB 00:00 ...
development/other_db | 2.7 MB 00:00 ...
Metadata Cache Created
本地有兩個*.repo文件時，新的repo文件中[]裏面的內容建議比老repo文件中的[]裏面的內容簡短，使新repo能先被建立緩存