AlmaLinux vs Rocky Linux
AlmaLinux and Rocky Linux are the two most widely used free Enterprise Linux distributions today. Both are rebuilt from RHEL’s publicly available source code, both are free, and both promise long-term support. For most server workloads they are interchangeable — but there are real differences in governance, compatibility strategy, and ecosystem tooling. This article lays them out and helps you decide.
Where Each Distribution Stands
Section titled “Where Each Distribution Stands”| Dimension | AlmaLinux | Rocky Linux |
|---|---|---|
| First release | 2021-03 (8.3) | 2021-06 (8.4) |
| Founded by | CloudLinux | Gregory Kurtzer (CentOS co-founder) |
| Governance | AlmaLinux OS Foundation (independent nonprofit) | RESF (Rocky Enterprise Software Foundation) |
| Commercial support | TuxCare (CloudLinux) | CIQ |
| RHEL compatibility | ABI / binary compatible (since 2023) | Aims to match RHEL package-for-package |
| Build system | Own build infrastructure | Peridot (open source, auditable) |
| Migration tools | almalinux-deploy, ELevate | migrate2rocky |
| Current major versions | 8.x, 9.x, 10.x | 8.x, 9.x, 10.x |
Compatibility Strategy: The Biggest Real Difference
Section titled “Compatibility Strategy: The Biggest Real Difference”Rocky Linux: Close to RHEL
Section titled “Rocky Linux: Close to RHEL”Rocky Linux aims to be as close to RHEL as possible, package for package (bug-for-bug compatible), so existing software and validation processes written for RHEL work unchanged. It rebuilds RHEL from public sources through Peridot, an open and auditable build system.
AlmaLinux: ABI Compatible
Section titled “AlmaLinux: ABI Compatible”After Red Hat restricted direct access to RHEL source code in 2023, AlmaLinux announced it was dropping the 1:1 rebuild goal in favor of guaranteeing ABI (Application Binary Interface) compatibility:
- Programs compiled on RHEL run directly on AlmaLinux, and vice versa
- Packages no longer need to match RHEL exactly, allowing faster security fixes
- Sources come from CentOS Stream and other public channels
Governance and Independence
Section titled “Governance and Independence”- AlmaLinux: Managed by the AlmaLinux OS Foundation, a 501(c)(6) nonprofit registered in Delaware, USA, with a community-elected board and long-term funding committed by CloudLinux. CloudLinux brings over a decade of RHEL-compatible distribution experience in enterprise hosting.
- Rocky Linux: Founded by CentOS co-founder Gregory Kurtzer with the slogan of returning to CentOS’s original mission. The RESF provides legal and infrastructure backing, CIQ handles commercial support, and the Peridot build system is fully open source.
Neither is the “product” of a single company — both have strong community and independence credentials.
Release Cadence and Lifecycle
Section titled “Release Cadence and Lifecycle”Both distributions ship corresponding versions within days of each RHEL minor release, with lifecycles aligned to RHEL:
| Major Version | Based on RHEL | Supported Until |
|---|---|---|
| 8 | 8.x | 2029 |
| 9 | 9.x | 2032 |
| 10 | 10.x | 2035 |
Migration Tooling Compared
Section titled “Migration Tooling Compared”| Tool | From | Purpose |
|---|---|---|
| almalinux-deploy | AlmaLinux | In-place migration to AlmaLinux from CentOS/Rocky/Oracle Linux |
| ELevate | AlmaLinux | Cross-major-version upgrades (e.g., CentOS 7 to EL 8/9, targeting any EL distribution) |
| migrate2rocky | Rocky | In-place migration to Rocky from CentOS/AlmaLinux |
Software Ecosystem
Section titled “Software Ecosystem”- Both work directly with mainstream third-party repositories: EPEL, ELRepo, Remi, and more
- Major hosting panels such as cPanel and Plesk support both
- All major clouds (AWS, Azure, GCP, Alibaba Cloud, Tencent Cloud) offer official images for both
- Official container images exist on Docker Hub and Quay.io
Which one is more stable?
Section titled “Which one is more stable?”Stability comes from the same RHEL base — there is virtually no difference at the kernel and core library level. The meaningful differences are in compatibility strategy and governance, not stability.
Which one releases faster?
Section titled “Which one releases faster?”Both typically ship within days of each RHEL minor release. AlmaLinux can occasionally push individual security fixes faster thanks to its ABI strategy.
Can I migrate directly between them?
Section titled “Can I migrate directly between them?”Yes. See the migration tooling section above. The scripts replace repositories and signing keys and reinstall key packages — take a snapshot or backup first.
Which should I choose?
Section titled “Which should I choose?”A simple decision rule:
- If you have RHEL-certification requirements in production or care about package-for-package parity, choose Rocky Linux
- If you value independent foundation governance, the ELevate toolchain, or faster security fixes, choose AlmaLinux
- If you just want free EL with no special requirements, either works — go with whichever your ecosystem favors
Further Reading
Section titled “Further Reading”- AlmaLinux — AlmaLinux in depth and ELevate cross-version upgrades
- Rocky Linux — Rocky Linux in depth and the Peridot build system
- RHEL — The upstream itself: release cadence and subscription model
- CentOS 7 EOL and Migration Paths — If you are still on CentOS 7, start here