AlmaLinux vs Rocky Linux vs Red Hat Enterprise Linux

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What are AlmaLinux and Rocky Linux?

AlmaLinux and Rocky Linux are community enterprise Linux distributions designed to provide compatibility with RHEL. They became especially popular after the shift away from classic CentOS Linux.

Both distributions aim to offer a stable, enterprise-oriented platform similar to RHEL, but without requiring paid Red Hat subscriptions.

Are AlmaLinux and Rocky Linux compatible with RHEL software?

In most cases: yes.

Most software designed for RHEL will also work on AlmaLinux and Rocky Linux because they maintain high compatibility with the RHEL ecosystem.

However, there is an important distinction:

  • Rocky Linux still aims for very close compatibility with RHEL behavior and packages.

  • AlmaLinux shifted toward ABI compatibility after Red Hat restricted access to full RHEL source packages in 2023. This means software compiled for RHEL should still run correctly, although AlmaLinux may occasionally implement fixes or patches differently from RHEL itself.

For typical workloads such as:

  • web servers

  • databases

  • containers

  • virtualization

  • development environments

…the practical differences are usually minimal.

What about RHEL-certified software?

This depends on two separate things:

1. Technical compatibility

Most RHEL-certified software will technically run on AlmaLinux and Rocky Linux without problems.

2. Vendor support policy

Some vendors officially support only systems running genuine RHEL with an active Red Hat subscription.

This is especially common with:

  • enterprise databases

  • banking software

  • healthcare systems

  • government environments

  • SAP or Oracle ecosystems

  • compliance-sensitive infrastructure

So while the software may function perfectly on Rocky or Alma, the vendor may refuse official support unless the system is running RHEL itself.

Why do companies still pay for RHEL?

The operating system itself is only part of the value.

RHEL subscriptions also include:

  • official vendor support

  • long-term maintenance guarantees

  • compliance certifications

  • legal assurances

  • security validation programs

  • ecosystem integrations

  • enterprise management tooling

This is particularly important for organizations that require:

  • FIPS certification

  • Common Criteria certification

  • regulatory compliance

  • support SLAs

  • certified hardware/software stacks

RHEL also includes tools such as Red Hat Insights, which provides system analytics, recommendations, and infrastructure management features.

Are AlmaLinux and Rocky Linux “enterprise distributions”?

Yes.

They are widely used in enterprise environments.

The better distinction is:

  • RHEL is a commercial enterprise Linux distribution with official Red Hat backing.

  • AlmaLinux and Rocky Linux are community enterprise Linux distributions.

Many organizations successfully run production infrastructure on AlmaLinux or Rocky Linux, especially when official vendor certification is not required.

Are updates delayed compared to RHEL?

Usually slightly.

Because AlmaLinux and Rocky Linux rebuild and publish updates after Red Hat releases them, there can be a short delay before updates become available.

In practice, this delay is often small:

  • sometimes hours

  • sometimes a day or two

For many users this is not important, but highly security-sensitive environments may prefer direct RHEL access.

Governance differences between AlmaLinux and Rocky Linux

Both projects pursue similar goals, but their governance models differ.

Rocky Linux

Rocky Linux was founded by Gregory Kurtzer, one of the original CentOS founders, and is governed by the Rocky Enterprise Software Foundation (RESF).

AlmaLinux

AlmaLinux was originally created by CloudLinux and later transitioned into a community-governed foundation model.

CloudLinux still financially supports the project.

Is RHEL free for personal or development use?

Yes.

Red Hat provides free developer subscriptions that allow individuals and small-scale environments to use RHEL legally without purchasing a commercial subscription.

This is often sufficient for:

  • home labs

  • learning

  • development

  • testing

  • small personal servers

Which one should you choose?

Choose RHEL if you need:

  • official vendor support

  • certifications and compliance

  • enterprise contracts

  • guaranteed support SLAs

  • vendor-required operating system certification

Choose AlmaLinux or Rocky Linux if you want:

  • a stable enterprise-style Linux platform

  • high RHEL compatibility

  • long-term support

  • no subscription costs

  • home lab or self-hosted infrastructure

  • production servers without enterprise compliance requirements

For many Linux administrators and self-hosters, the practical day-to-day differences between these systems are very small.

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My fear is that like the original CentOS, that distros like AlmaLinux and RockyLinux could disappear at any time for a variety of reasons such as simply throwing in the towel or other reasons that make you plan another migration strategy. While it’s probably unlikely, it’s always something that’s in the back of my mind. Red Hat on the other hand, they’ll always be around. And when you can use the free developer subscription in RHEL, I look at it as…why not just use RHEL?

I still distrohop to an extent, but I mainly stick to the main base distros. I like Red Hat, but unless you use flatpak, it’s quite limited on software available for desktop use, even with the EPEL enabled. But that’s the same on all the Red Hat based enterprise distros, including Alma, Rocky and CentOS Stream.

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Someone told me recently that CentOS is like “stable Fedora” in preparation to become the next rock-solid RHEL. Now, whether we can call CentOS “stable” or not, the fact is that Fedora is moving very fast while CentOS does not. So in that regards it may be a good distro for some people. I am just afrait that “some people” are actually RHEL developers.

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I’ve actually spent some time on CentOS Stream, so I’ll give my two cents on it and how I feel about it. Honestly, it’s not bad in my opinion. But I would certainly agree that it could be considered a stable Fedora. However, it still does receive updates quite frequently. I could leave it alone for about 3 days or so and there’d be anywhere between 20-50 updates available for it. So between Red Hat Enterprise Linux and CentOS Stream, RHEL does receive a lot less updates than CentOS Stream.

It also goes without saying but I’ll explain it for those who might not know the difference between CentOS Stream and something like RHEL and RHEL-like clones is that it’s somewhat of a semi-rolling release. It’ll still be known as CentOS Stream 10 while RHEL will be versions 10.0, 10.1, 10.2, 10.3 and so on. But I’m trying to learn exactly how the EPEL works, Extra Packages for Enterprise Linux. It seems like CentOS Stream will pull from the latest repository because of it’s “testing” nature. Whereas RHEL and like clones will only pull from it’s major/minor release repository. At least, by default. I think you can override that, but that would probably be a bad idea. So for example, if you’re running RHEL 10.1, when you set the EPEL up, it will automatically pull from the 10.1 repository and those aren’t necessarily as up to date as newer minor versions. For example, Plasma 6.4.5 is the version in EPEL 10.1, but in 10.2 and 10.3, Plasma 6.6.4 is in those ones. I started catching onto this when I tried CentOS Stream and saw that Plasma was much more up to date in it than it was in RHEL.

But while CentOS Stream might be slightly better for desktop use than RHEL, it’s still limited in software and either limited by what is in the official repos and EPEL, or by flatpak. Sure, you can download appimages and sometimes you get software like Firefox that you can install manually, but not everyone is looking for that and prefer to get as much as they can from official repos. So CentOS Stream is still limited like other enterprise Linux versions, but it’s generally a bit more up to date and therefor not as stable as RHEL. So I can see why when the original CentOS was discontinued, why it ruffled a lot of feathers since CentOS Stream is technically a different beast. At heart, it’s mostly the same concept but updates move faster and is now the playground for RHEL, to make sure things are good to be baked into the new RHEL release. In hindsight, it’s still Enterprise Linux, just not a 1:1 clone anymore…far from it.

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Also worth mentioning CIQ and OpenHPC on Rocky (Warewulf and etc)

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