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The Rise of AlmaLinux and Rocky Linux: What Makes Them the Perfect CentOS Replacements?

When Red Hat announced the transition of CentOS from a stable downstream distribution to the upstream, rolling-release CentOS Stream, the Linux server world was rocked. Businesses and developers reliant on CentOS for its stability and compatibility with Red Hat Enterprise Linux (RHEL) were left scrambling for alternatives. Enter AlmaLinux and Rocky Linux, two community-driven, RHEL-compatible distributions that have since emerged as ideal replacements for CentOS.

In this post, we’ll dive into the features, philosophies, and benefits of AlmaLinux and Rocky Linux, explaining why they’ve quickly become go-to solutions for those seeking enterprise-grade stability without the licensing costs of RHEL.


The CentOS Dilemma: Why a Replacement Was Needed

For years, CentOS was the free, stable clone of RHEL, offering all the benefits of enterprise Linux without the cost. However, the shift to CentOS Stream in December 2020 introduced a rolling-release model, which:

  • Prioritized new feature testing for RHEL instead of downstream stability.
  • Reduced reliability for businesses that depended on long-term support.
  • Left users seeking a robust, RHEL-compatible alternative for production environments.

This void paved the way for AlmaLinux and Rocky Linux to rise to prominence.


What Are AlmaLinux and Rocky Linux?

Both AlmaLinux and Rocky Linux are free, open-source operating systems designed to be 1:1 binary-compatible with RHEL. They offer enterprise-grade stability, community-driven governance, and a commitment to long-term support.


1. AlmaLinux: A Stable, Community-Focused RHEL Alternative

Overview

Launched in March 2021 by the AlmaLinux Foundation (backed by CloudLinux), AlmaLinux is built to provide a seamless migration path for CentOS users. The foundation is a non-profit organization, ensuring that AlmaLinux remains community-driven and free for all.

Key Features

  • 1:1 Binary Compatibility with RHEL: Ensures seamless compatibility with RHEL packages and applications.
  • Stable, Predictable Release Cycle: Offers long-term support for every release.
  • Wide Ecosystem Support: Compatible with major hosting providers (AWS, Azure, Google Cloud) and software like cPanel and Plesk.
  • Migration Tools: Provides free migration scripts for CentOS users.

Governance

AlmaLinux is governed by a community-elected board, ensuring decisions reflect the needs of its users.

Best For

  • Enterprises transitioning from CentOS.
  • Hosting providers and cloud environments.
  • Businesses that require long-term stability.

Fun Fact: The name “Alma” means “soul” in Spanish, symbolizing the soul of CentOS carried forward.


2. Rocky Linux: Built by the Creator of CentOS

Overview

Rocky Linux was founded by Gregory Kurtzer, the original creator of CentOS, with a mission to uphold the stability and community spirit that CentOS once offered. The first stable release was launched in June 2021, and Rocky Linux has quickly gained traction among enterprise users.

Key Features

  • RHEL Binary Compatibility: Fully compatible with RHEL packages, ensuring seamless integration.
  • Security and Stability: Prioritizes long-term support and frequent security updates.
  • Community-Led Development: Heavily relies on the input and support of a growing, global user base.
  • Migration Simplicity: Offers tools to migrate from CentOS with minimal effort.

Governance

Rocky Linux is governed by the Rocky Enterprise Software Foundation (RESF), a public-benefit corporation committed to transparency and independence.

Best For

  • Organizations looking for a trusted CentOS successor.
  • Enterprise users needing a production-ready RHEL alternative.
  • Developers seeking an open-source, community-driven OS.

Fun Fact: Rocky Linux was named in honor of Rocky McGaugh, a CentOS co-founder, to reflect the project’s dedication to the community.


AlmaLinux vs. Rocky Linux: Key Differences

FeatureAlmaLinuxRocky Linux
GovernanceAlmaLinux Foundation (non-profit)Rocky Enterprise Software Foundation (RESF)
Community FocusCommunity-elected board, enterprise-backedCommunity-driven, founded by CentOS creator
Release CycleStable and predictableStable with long-term support
Migration ToolsYes (Free tools for CentOS migration)Yes (CentOS migration scripts)
Enterprise UseWidely adopted by hosting providersGaining rapid traction in enterprises

Why AlmaLinux and Rocky Linux Are Ideal CentOS Replacements

1. Binary Compatibility with RHEL

Both distros maintain 1:1 compatibility with RHEL, ensuring that applications and software built for RHEL will work seamlessly without modification.

2. Enterprise-Grade Stability

These operating systems are designed to provide long-term support, frequent security updates, and the stability required for mission-critical environments.

3. Community-Driven Development

Unlike CentOS Stream, AlmaLinux and Rocky Linux prioritize the needs of the community, with governance models that ensure users have a say in the direction of development.

4. Easy Migration from CentOS

Both distros provide free tools to migrate existing CentOS systems with minimal downtime.

5. Cost-Effective Alternatives to RHEL

For businesses that want the reliability of RHEL without the licensing fees, AlmaLinux and Rocky Linux offer the perfect solution.


Use Cases for AlmaLinux and Rocky Linux

  • Web Hosting: Compatible with cPanel, Plesk, and other hosting platforms.
  • Enterprise Workloads: Perfect for companies needing a robust OS for databases, application servers, and virtualization.
  • Cloud Deployments: Both distros integrate seamlessly with AWS, Azure, and Google Cloud.
  • Development Environments: Offer a reliable, RHEL-like experience for developers building on open-source platforms.

Migration from CentOS to AlmaLinux or Rocky Linux

Steps for Migration:

  1. Backup Your System: Always create a full backup before initiating the migration.
  2. Run Migration Scripts: Use tools like AlmaLinux’s Elevate or Rocky Linux’s migration scripts to switch from CentOS.
  3. Test Your Environment: Verify applications and services after migration to ensure compatibility.
  4. Monitor Updates: Keep your system updated for the latest security patches and features.


Conclusion

The rise of AlmaLinux and Rocky Linux has filled the gap left by CentOS, offering enterprise-grade, RHEL-compatible solutions with a community-first approach. Both operating systems provide stability, security, and flexibility, making them ideal choices for businesses, hosting providers, and developers alike.

Choosing between the two depends on your specific needs, but either way, you’ll gain a reliable, long-term solution for your Linux server environment.

Ready to migrate? Test both AlmaLinux and Rocky Linux to find the perfect fit for your infrastructure!

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