Linux yum出错 Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again，
Linux yum出错 Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again，
Linux下使用yum命令时报错Error: Cannot retrieve repository metadata (repomd.xml) for repository......，具体如下所示
[root@localhost yum.repos.d]# yum makecache
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Repository base is listed more than once in the configuration
file:///media/repodata/repomd.xml: [Errno 14] Could not open/read file:///media/repodata/repomd.xml
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again
[root@localhost yum.repos.d]# ls /media -hl
total 3633166
dr-x------. 1 root root 8.0k Sep 14 20:32 CDROM
dr-xr-xr-x. 12 root root 8.0k Jan 30 2013 RHEL_6.4 x86_64 Disc 1
-rwxr-xr-x. 1 root root 3.5G Dec 16 2015 rhel-server-6.4-x86_64-dvd.iso
请注意观察错误信息，在Error上有提示:
file:///media/repodata/repomd.xml: [Errno 14] Could not open/read file:///media/repodata/repomd.xml
意思是说repomd文件没有找到，这会导致yum命令无法检索存储库元数据(翻译的，或者理解为找不到库)；即需要让yum命令能找到这个文件，这个文件默认在系统安装光盘的/repodata/目录下；
检查yum配置信息,到/etc/yum.repos.d/下检查配置的repo文件:
[root@localhost /]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# ls -l
total 8
drwxr-xr-x. 2 root root 4096 Oct 11 02:04 bak_repo
-rwxr-xr-x. 1 root root 162 Oct 11 01:36 rhel-base.repo
[root@localhost yum.repos.d]# more rhel-base.repo
[base]
name=RedHat
baseurl=file:///media/
enabled=1
gpgcheck=0
gpgkey=file:///media/RPM-GPG-KEY-redhat-release
这里关系到如何配置本地yum源，对于如何配置yum源，可以参考:
http://www.cnblogs.com/Wherebolezi/p/4626670.html
在本地yum配置文件上，可以看到yum指向本地的/media/文件；/media目录如下
[root@localhost yum.repos.d]# ls /media -hl
total 3.5G
dr-x------. 1 root root 2.0K Sep 14 20:32 CDROM
dr-xr-xr-x. 12 root root 8.0K Jan 30 2013 RHEL_6.4 x86_64 Disc 1
-rwxr-xr-x. 1 root root 3.5G Dec 16 2015 rhel-server-6.4-x86_64-dvd.iso
通过以上信息，表示/media目录下不存在repomd.xml文件，这个文件在RHEL_6.4 x86_64 Disc 1中;可以通过修改yum配置让系统能找到文件
修改后的内容如下（注意目录中的空格前需要\转义符）：
[base]
name=RedHat
baseurl=file:///media/RHEL_6.4\ x86_64\ Disc\ 1
enabled=1
gpgcheck=0
gpgkey=file:///media/RHEL_6.4\ x86_64\ Disc\ 1/RPM-GPG-KEY-redhat-release
然后清理: yum clean all
yum makecache
结果如下所示：
[root@localhost yum.repos.d]# yum clean all
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Cleaning repos: base
Cleaning up Everything
[root@localhost yum.repos.d]#
[root@localhost yum.repos.d]#
[root@localhost yum.repos.d]# yum makecache
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
base | 3.9 kB 00:00 ...
base/group_gz | 204 kB 00:00 ...
base/filelists_db | 3.7 MB 00:00 ...
base/primary_db | 3.1 MB 00:00 ...
base/other_db | 1.5 MB 00:00 ...
Metadata Cache Created
没有 Error: Cannot retrieve.....内容，且没有Could not open/read file......等打不开文件的提示，即表示问题已解决
如果问题仍然存在，则需要核对下安装光盘与系统本身是否匹配，或者yum源与系统版本的匹配程度，然后多执行几次yum clean all --> yum makecache观察情况
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