CentOS 7 update using “yum update” does not work
I have a VM running CentOS 7 that I have not used for a long time. Today I launched it and tried to update the CentOS system to the latest version using yum update, but I got a lot of errors:
Loaded plugins: fastestmirror, langpacks http//bay.uchicago.edu/centos/7.0.1406/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found Trying other mirror. http//mirror.cs.pitt.edu/centos/7.0.1406/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found Trying other mirror. http//mirror.anl.gov/pub/centos/7.0.1406/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 403 - Forbidden Trying other mirror. http//mirror.pac-12.org/7.0.1406/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found Trying other mirror. http//centos.expedientevirtual.com/7.0.1406/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found Trying other mirror.
Many other similar errors are omitted ...
Trying other mirror. Loading mirror speeds from cached hostfile * base: bay.uchicago.edu * epel: csc.mcs.sdsmt.edu * extras: mirror.ancl.hawaii.edu * nux-dextop: li.nux.ro * updates: centos-distro.cavecreek.net No packages marked for update
I deleted the colon after http in the above error messages to avoid warnings. I think these errors might come from the CentOS version I am using: 7.0.1406 -- since current latest version is a new one, say, 7.0.1588 or something, the corresponding path does not exist and hence the HTTP error 404. But how to have my current CentOS automatically adjust the path name to the latest version and be able to update from the correct URL? Thanks.
Run the following command to clean the metadata:
yum clean all
This will clean all yum caches including cached mirrors of your yum repositories. On the next run it will get a new list of mirrors.
The CentOS-Base.repo file in /etc/yum.repos may have changed since you installed. Current mirror list is as below, with the baseurl= line commented out.