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 HO

Answer 1

Uncomment baseurl in this file: /etc/yum.repos.d/CentOS-Base.repo

#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/

In this block:

[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

By uncomment, I mean change this: #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/, to this: baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/ (remove the #).

Answer 2

I had this problem in a company environment with MITM proxy after adding the EPEL repo with

yum install epel-release

This doesn't happen before (e.g. on yum update). I checked all answers and none of them fixed my problem. Figured out that the other repos use http by default, where epel use https:

# grep mirror /etc/yum.repos.d/epel.repo
metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch&infra=$infra&content=$contentdir
metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-7&arch=$basearch&infra=$infra&content=$contentdir
metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-source-7&arch=$basearch&infra=$infra&content=$contentdir

So I copied our company root CA in the CentOS trust store and update it:

cp /home/user/my-ca.crt /etc/pki/ca-trust/source/anchors/
update-ca-trust

After adding the cert, updating and installing packages from the EPEL repo works fine!

Answer 3

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!