centos 7.1 - error repository

Question

Hello I have download the minimal release of CENTOS 7 at this url link download ISO centos 7.x

All work correctly...the PING and the network is OK. I ping to external HOST for example.

But when I digit :

[root@localhost ~]# yum update
Loaded plugins: fastestmirror


 One of the configured repositories failed (Unknown),
 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. Disable the repository, 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 <repoid>

     4. 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=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64

Why?

This is another command:


root@localhost ~]# yum repolist all
Loaded plugins: fastestmirror
repo id                           repo name                           status
C7.0.1406-base/x86_64             CentOS-7.0.1406 - Base              disabled
C7.0.1406-centosplus/x86_64       CentOS-7.0.1406 - CentOSPlus        disabled
C7.0.1406-extras/x86_64           CentOS-7.0.1406 - Extras            disabled
C7.0.1406-fasttrack/x86_64        CentOS-7.0.1406 - CentOSPlus        disabled
C7.0.1406-updates/x86_64          CentOS-7.0.1406 - Updates           disabled
base/7/x86_64                     CentOS-7 - Base                     enabled: 0
base-debuginfo/x86_64             CentOS-7 - Debuginfo                disabled
base-source/7                     CentOS-7 - Base Sources             disabled
centosplus/7/x86_64               CentOS-7 - Plus                     disabled
centosplus-source/7               CentOS-7 - Plus Sources             disabled
cr/7/x86_64                       CentOS-7 - cr                       disabled
extras/7/x86_64                   CentOS-7 - Extras                   enabled: 0
extras-source/7                   CentOS-7 - Extras Sources           disabled
fasttrack/7/x86_64                CentOS-7 - fasttrack                disabled
updates/7/x86_64                  CentOS-7 - Updates                  enabled: 0
updates-source/7                  CentOS-7 - Updates Sources          disabled
repolist: 0
[root@localhost ~]#

The content of the file /etc/yum.repos.d/CentOS-Base.repo

[root@localhost ~]# cat /etc/yum.repos.d/CentOS-Base.repo
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[root@localhost ~]#

Answer 1

sudo sed -i 's/https/http/g' /etc/yum.repos.d/epel.repo

Answer 2

Check your resolv.conf to see where your name server is pointing. Make sure it's something legit as mine was pointing to an old DNS server on the network that was wiped out. I updated it with the new IP address et voila!

Answer 3

I landed here because I had added a bad mirror for a different dependency (passenger, for a Rails app), and solved this problem by just deleting the bad mirror:

rm /etc/yum.repos.d/YOUR-BAD-DEPENDENCY-NAME.repo

e.g.

rm /etc/yum.repos.d/passenger.repo