yumfixcentos6.txt

 to fix yum after CentOS 6 went EOL

curl https://www.getpagespeed.com/files/centos6-eol.repo --output /etc/yum.repos.d/CentOS-Base.repo

Alternatively, you can manually replace the contents of the file /etc/yum.repos.d/CentOS-Base.repo with the necessary configuration.
Copy-paste the entire snippet below and hit Enter:
cat <<-'EOF' > /etc/yum.repos.d/CentOS-Base.repo
[C6.10-base]
name=CentOS-6.10 - Base
baseurl=http://vault.epel.cloud/6.10/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1
metadata_expire=never

[C6.10-updates]
name=CentOS-6.10 - Updates
baseurl=http://vault.epel.cloud/6.10/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1
metadata_expire=never

[C6.10-extras]
name=CentOS-6.10 - Extras
baseurl=http://vault.epel.cloud/6.10/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1
metadata_expire=never

[C6.10-contrib]
name=CentOS-6.10 - Contrib
baseurl=http://vault.epel.cloud/6.10/contrib/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=0
metadata_expire=never

[C6.10-centosplus]
name=CentOS-6.10 - CentOSPlus
baseurl=http://vault.epel.cloud/6.10/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=0
metadata_expire=never
EOF

Now you can run yum upgrade

Fixing EPEL repository
curl https://www.getpagespeed.com/files/centos6-epel-eol.repo --output /etc/yum.repos.d/epel.repo

Fixing SCLO repositories
yum -y install centos-release-scl
curl https://www.getpagespeed.com/files/centos6-scl-eol.repo --output /etc/yum.repos.d/CentOS-SCLo-scl.repo
curl https://www.getpagespeed.com/files/centos6-scl-rh-eol.repo --output /etc/yum.repos.d/CentOS-SCLo-scl-rh.repo

https://www.getpagespeed.com/server-setup/how-to-fix-yum-after-centos-6-went-eol