As CentOS has shifted its focus to CentOS Stream, many users and businesses are seeking a more stable and predictable alternative. Rocky Linux, a newcomer in the Linux distribution scene, presents itself as a formidable successor, offering binary compatibility with Red Hat Enterprise Linux (RHEL). This guide is crafted to assist beginners in smoothly transitioning from CentOS to Rocky Linux, complete with practical examples and command lines.

Understanding the Shift to Rocky Linux

Why Rocky Linux?

  • Long-Term Stability: Rocky Linux promises a stable lifecycle, akin to traditional CentOS.
  • Binary Compatibility with RHEL: Ensures seamless transitions from CentOS or RHEL.
  • Strong Community Support: Backed by a growing and dedicated community.

Step 1: Preparing for Migration

Initial Considerations:

  • Backup Your Data: Always start with a complete backup of your system and data.
  • Update CentOS: Ensure your CentOS system is fully updated using sudo yum update.

Step 2: Adding Rocky Linux Repositories

Repository Setup:

  1. Install Rocky Linux Repositories: Run sudo curl -O https://dl.rockylinux.org/pub/rocky/RPM-GPG-KEY-rockyofficial followed by sudo rpm --import RPM-GPG-KEY-rockyofficial.
  2. Verify the Import: Check the GPG key import with gpg --list-keys | grep rocky.

Step 3: Removing CentOS Repositories

Repository Removal:

  • List Current Repos: Use yum repolist to view all current repositories.
  • Remove CentOS Repos: Execute sudo yum remove 'centos-*' to clean up CentOS-specific repos.

Step 4: Installing Rocky Linux

Installation Commands:

  1. Download Rocky Linux Package: Use sudo dnf install rocky-release.
  2. Verify Rocky Linux Repos: Confirm the addition of Rocky Linux repos with dnf repolist.

Step 5: Migrating to Rocky Linux

Migration Process:

  1. Sync Packages: Run sudo dnf distro-sync -y to synchronize packages to the latest Rocky Linux versions.
  2. Update Kernel: Upgrade the kernel to Rocky Linux’s version with sudo dnf -y update kernel-core.
  3. Remove Orphaned Packages: Clean up with sudo dnf autoremove.

Step 6: Finalizing the Transition

Post-Installation Steps:

  1. Reboot System: Apply all changes by rebooting with sudo reboot.
  2. Check Rocky Linux Version: Confirm migration success with cat /etc/os-release.

Step 7: Configuring Rocky Linux

Basic Configuration:

  • Network Settings: Configure your network settings as per your requirement.
  • Firewall Management: Ensure your firewall settings are correctly configured.
  • System Services: Review and adjust system services as necessary.

Step 8: Additional Tips and Best Practices

Best Practices:

  • Regularly update your system with sudo dnf update.
  • Monitor system logs for any irregularities.
  • Stay informed about Rocky Linux updates and community news.

Conclusion

Congratulations! You have successfully transitioned from CentOS to Rocky Linux. This shift not only ensures continued stability and security for your system but also aligns you with a robust and growing community. Rocky Linux stands as a reliable, enterprise-ready platform, ideal for both personal and professional use.

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