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

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	Koji (since 10; Peridot before)
Migration tools	almalinux-deploy, ELevate	migrate2rocky / migrate2rocky9
Current major versions	8.x, 9.x, 10.x	8.x, 9.x, 10.x

Compatibility Strategy: The Biggest Real Difference

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, and the build process is auditable; the build system itself changed — since Rocky 10, builds come from Koji, while Peridot was the in-house system before version 10.

AlmaLinux: ABI Compatible

After Red Hat restricted direct access to RHEL source code in 2023, AlmaLinux announced on 2023-07-13 that it was adjusting its compatibility goal from a “1:1 rebuild” to ABI (Application Binary Interface) compatibility as the target (not “giving up compatibility”):

Goal: programs compiled on RHEL run on AlmaLinux (the reverse direction is not covered)
Packages no longer need to match RHEL exactly, allowing faster security fixes
Sources come from CentOS Stream and other public channels

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 and CIQ handles commercial support; builds are public and auditable, with the build system being Koji since Rocky 10 (Peridot before that).

Neither is the “product” of a single company — both have strong community and independence credentials.

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	AlmaLinux supported until	Rocky supported until
8	8.x	2029-05	2029-05
9	9.x	2032-05	2032-05
10	10.x	2035-05	2035-05

These match src/data/distro-profiles.json; both projects follow RHEL minor releases within days and align their lifecycles to RHEL.

Migration Tooling Compared

Tool	From	Purpose
almalinux-deploy	AlmaLinux	In-place migration to AlmaLinux from CentOS/Rocky/Oracle Linux
ELevate	AlmaLinux	One-step cross-major upgrades; sources and targets are constrained (see below) and Rocky is not a target
migrate2rocky / migrate2rocky9	Rocky	In-place migration within the same major version (EL8 -> Rocky 8, EL9 -> Rocky 9); not a cross-major upgrade

ELevate’s sources and targets are constrained, not “any EL distribution”: the upstream data packages are only leapp-data-almalinux, leapp-data-almalinux-kitten and leapp-data-centos — there is no leapp-data-rocky, and EL8 sources are limited to AlmaLinux 8 or CentOS Stream 8. See the ELevate section of the AlmaLinux page and EL8 to EL9.

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

FAQ

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?

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?

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?

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