Updating CentOS 7 After EOL

I found a site that showed how you could update CentOS 7 after Red Hat shut down all of the repositories for it when it was classified End of Life.

I thought I would post on how to do this, lest I cannot locate that link or perhaps it gets taken down.

The link is at https://gcore.de/en/help/linux/centos7-new-repo-url-after-eol.php

Basically the process is as follows:

1. Backup the CentOS-* repositories.

2. Backup the existing epel.repo

2. Make a new CentOS.repo repository file, with the following:

[base]
name=CentOS-7.9.2009 - Base
baseurl=https://vault.centos.org/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
metadata_expire=never

#released updates
[updates]
name=CentOS-7.9.2009 - Updates
baseurl=https://vault.centos.org/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
metadata_expire=never

# additional packages that may be useful
[extras]
name=CentOS-7.9.2009 - Extras
baseurl=https://vault.centos.org/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
metadata_expire=never

# additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-7.9.2009 - CentOSPlus
baseurl=https://vault.centos.org/7.9.2009/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=0
metadata_expire=never

#fasttrack - packages by Centos Users
[fasttrack]
name=CentOS-7.9.2009 - Contrib
baseurl=https://vault.centos.org/7.9.2009/fasttrack/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=0
metadata_expire=never

NOTE: I had to change the repos from http to https. 

3. Make a new epel.repo repository file with the following:

[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=https://archives.fedoraproject.org/pub/archive/epel/7/$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
metadata_expire=never

[epel-debuginfo]
name=Extra Packages for Enterprise Linux 7 - $basearch - Debug
baseurl=https://archives.fedoraproject.org/pub/archive/epel/7/$basearch/debug
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1
metadata_expire=never

[epel-source]
name=Extra Packages for Enterprise Linux 7 - $basearch - Source
baseurl=https://archives.fedoraproject.org/pub/archive/epel/7/SRPMS
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1
metadata_expire=never

NOTE: These base urls are already https in his post, so no changes needed here.

Next, Remove all currently available metadata: yum clean all

Now enter yum check-update to load a new list of all available packages and to check if your local installation has all available updates. 

Afterwards you can install packages as usual using yum install.

NOTE: I just did a yum update instead of a yum install. Hope that was correct. It seemed to work fine.