CentOS EPEL Error: Cannot retrieve metalink for repository: epel.

Problem

Resolve the "CentOS EPEL Error: Cannot retrieve metalink for repository: epel" error on CentOS.

tl;dr

sudo sed -i 's/(mirrorlist=http)s/\1/' /etc/yum.repos.d/epel.repo

Solution

If you see an error when attempting to install or update a package, such as:

# yum install mypackage
Loaded plugins: fastestmirror, security
Setting up Install Process
Loading mirror speeds from cached hostfile
Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again

This is fairly common on CentOS 6 if you attempt to use the EPEL repository, and occurs when you attempt to retrieve files from the HTTPS server instead of the HTTP server.

There are two solutions:

Bash command solution

Run the following command from your command line:

sudo sed -i 's/(mirrorlist=http)s/\1/' /etc/yum.repos.d/epel.repo

Edit configuration file

While the previous method directly erases the 'S' in 'HTTPS', you can also do it by editing the repository configuration file.

nano /etc/yum.repos.d/epel.repo

Then, find any lines such as:

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch

And erase the S from any instances of https://

mirrorlist=http://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch


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