How To Migrate Existing Hosts from CentOS to Rocky Linux 8

CentOS will reach end-of-life on December 31, 2021. Use these steps to convert a CentOS 8 host to Rocky Linux 8:

• Remove CentOS repos RPMs:

 rpm -qa  | grep centos | xargs rpm -e --nodeps

• Install Rocky repos RPMS:

  yum install --disablerepo=* https://download.rockylinux.org/pub/rocky/8.4/BaseOS/x86_64/os/Packages/rocky-gpg-keys-8.4-26.el8.noarch.rpm https://download.rockylinux.org/pub/rocky/8.4/BaseOS/x86_64/os/Packages/rocky-logos-84.5-7.el8.x86_64.rpm https://download.rockylinux.org/pub/rocky/8.4/BaseOS/x86_64/os/Packages/rocky-obsolete-packages-8-4.noarch.rpm https://download.rockylinux.org/pub/rocky/8.4/BaseOS/x86_64/os/Packages/rocky-release-8.4-26.el8.noarch.rpm https://download.rockylinux.org/pub/rocky/8.4/BaseOS/x86_64/os/Packages/rocky-repos-8.4-26.el8.noarch.rpm 

• Reboot the host
• Install rocky-background RPM:

 yum clean all; yum install -y rocky-backgrounds

• Make sure everything looks good:

 yum check

• (Optional) Point to CAC-hosted Rocky 8 repositories:

  cd /etc/yum.repos.d
  curl -O 'https://redcloud.cac.cornell.edu:8443/swift/v1/rocky-8-repos/Rocky-AppStream.repo'; curl -O 'https://redcloud.cac.cornell.edu:8443/swift/v1/rocky-8-repos/Rocky-BaseOS.repo'; curl -O 'https://redcloud.cac.cornell.edu:8443/swift/v1/rocky-8-repos/Rocky-Devel.repo'; curl -O 'https://redcloud.cac.cornell.edu:8443/swift/v1/rocky-8-repos/Rocky-Extras.repo'; curl -O 'https://redcloud.cac.cornell.edu:8443/swift/v1/rocky-8-repos/Rocky-HighAvailability.repo'; curl -O 'https://redcloud.cac.cornell.edu:8443/swift/v1/rocky-8-repos/Rocky-PowerTools.repo'; curl -O 'https://redcloud.cac.cornell.edu:8443/swift/v1/rocky-8-repos/Rocky-ResilientStorage.repo'

• Make sure everything is up-to-date:

 yum update