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When I tried to run yum update all or Yum search, all I got is below error:

[root@localhost /]# yum search all Loaded plugins: fastestmirror, langpacks C7.0.1406-base | 3.6 kB 00:00:00
C7.0.1406-centosplus | 2.9 kB 00:00:00
C7.0.1406-extras | 2.9 kB 00:00:00
C7.0.1406-fasttrack | 2.9 kB 00:00:00
C7.0.1406-updates | 2.9 kB 00:00:00
C7.1.1503-base | 3.6 kB 00:00:00
C7.1.1503-centosplus | 3.4 kB 00:00:00
C7.1.1503-extras | 3.4 kB 00:00:00
C7.1.1503-fasttrack | 3.4 kB 00:00:00
C7.1.1503-updates | 3.4 kB 00:00:00
http://vault.centos.org/7.2.1511/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2a00:f10:10b:13::10: Network is unreachable" Trying other mirror. C7.2.1511-base | 3.6 kB 00:00:00
C7.2.1511-centosplus | 3.4 kB 00:00:00
C7.2.1511-extras | 3.4 kB 00:00:00
C7.2.1511-fasttrack | 3.3 kB 00:00:00
C7.2.1511-updates | 3.4 kB 00:00:00
C7.3.1611-base | 3.6 kB 00:00:00
C7.3.1611-centosplus | 3.4 kB 00:00:00
C7.3.1611-extras | 3.4 kB 00:00:00
C7.3.1611-fasttrack | 3.3 kB 00:00:00
C7.3.1611-updates | 3.4 kB 00:00:00
base | 3.6 kB 00:00:00
base-debuginfo | 2.5 kB 00:00:00
base-source | 2.9 kB 00:00:00
file:///media/CentOS/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/CentOS/repodata/repomd.xml" Trying other mirror. file:///media/cdrom/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/cdrom/repodata/repomd.xml" Trying other mirror. file:///media/cdrecorder/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/cdrecorder/repodata/repomd.xml" Trying other mirror.

One of the configured repositories failed (CentOS-7 - Media), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this:

 1. Contact the upstream for the repository and get them to fix the problem.

 2. Reconfigure the baseurl/etc. for the repository, to point to a working
    upstream. This is most often useful if you are using a newer
    distribution release than is supported by the repository (and the
    packages for the previous distribution release still work).

 3. Run the command with the repository temporarily disabled
        yum --disablerepo=c7-media ...

 4. Disable the repository permanently, so yum won't use it by default. Yum
    will then just ignore the repository until you permanently enable it
    again or use --enablerepo for temporary usage:

        yum-config-manager --disable c7-media
    or
        subscription-manager repos --disable=c7-media

 5. Configure the failing repository to be skipped, if it is unavailable.
    Note that yum will try to contact the repo. when it runs most commands,
    so will have to try and fail each time (and thus. yum will be be much
    slower). If it is a very temporary problem though, this is often a nice
    compromise:

        yum-config-manager --save --setopt=c7-media.skip_if_unavailable=true

failure: repodata/repomd.xml from c7-media: [Errno 256] No more mirrors to try. file:///media/CentOS/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/CentOS/repodata/repomd.xml" file:///media/cdrom/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/cdrom/repodata/repomd.xml" file:///media/cdrecorder/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/cdrecorder/repodata/repomd.xml"

  • This is a network problem. Does IPv6 internet access work for you in general? Try ping -6 google.com, ping -6 www.yahoo.com or ping -6 facebook.com. – Johan Myréen Oct 18 '17 at 7:33

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