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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →No—AlmaLinux did not stop being compatible with Red Hat Enterprise Linux (RHEL). In July 2023, it stopped aiming to be an exact downstream rebuild and shifted to ABI and binary compatibility: the project intends applications and kernel modules that work on RHEL to work on AlmaLinux, but does not promise an identical source tree or a bug-for-bug copy. Oracle had already raised concerns about the effects of Red Hat’s source-access change. Both distributions still describe compatibility with RHEL as a goal, though their approaches differ.
What changed in AlmaLinux’s relationship with RHEL?
AlmaLinux’s original downstream-rebuild model relied on publicly available RHEL source code to produce a close rebuild. In 2023, Red Hat changed public access to RHEL source code, disrupting that approach for projects that depended on those sources. AlmaLinux responded by changing its target rather than declaring RHEL compatibility over.
In July 2023, the AlmaLinux project said it would use CentOS Stream and Oracle Linux sources in the immediate term, carefully curating updates to maintain compatibility. Its current comparison documentation describes a mixed-source approach drawing on RHEL, CentOS Stream, and other upstreams. In other words, the inputs and build model changed; the compatibility objective did not disappear.
What does ABI compatibility mean in practice?
An application binary interface (ABI) defines how compiled software interacts with system components such as libraries and the kernel. AlmaLinux’s stated compatibility aim is that applications and kernel modules that work on RHEL should work on AlmaLinux; the project says a failure to do so would be treated as a bug.
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That is a practical compatibility commitment, not a guarantee that AlmaLinux contains the same source code as RHEL, reproduces every RHEL bug, or behaves identically in every workload. A 1:1 downstream rebuild aims to reproduce the upstream distribution from its sources. ABI compatibility instead focuses on whether software built for the target system can run. For production workloads, validate the application, integrations, and any kernel modules you depend on in your own environment.
Is AlmaLinux still a CentOS replacement?
It can still serve as a community-oriented enterprise Linux alternative for organizations seeking RHEL compatibility. But “replacement” needs qualification: AlmaLinux is no longer an exact rebuild of RHEL, and its source strategy is not the same as the former CentOS Linux rebuild model. It is a distinct distribution with its own compatibility policy and governance.
The AlmaLinux OS Foundation, which oversees the project, is a 501(c)(6) organization founded in March 2021, according to its FAQ. Commercial support is separate from the community foundation; organizations should evaluate support arrangements independently of the distribution’s technical compatibility target.
How do AlmaLinux, Oracle Linux, and RHEL differ?
The main distinction is not simply “compatible” versus “incompatible.” It is what each distribution promises, how it builds and publishes its software, and which operating model fits your systems.
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| Area | AlmaLinux | Oracle Linux | RHEL |
|---|---|---|---|
| Compatibility target | ABI/binary compatibility; no longer an exact downstream rebuild. | Oracle claims application-binary compatibility with RHEL. | Vendor reference distribution. |
| Sources and build approach | Mixed sources, including RHEL, CentOS Stream, and other upstreams, curated to maintain compatibility. | Oracle publishes its own binaries and source and uses its own build and test process. | Sources and releases are controlled by Red Hat. |
| Kernel options | AlmaLinux kernel, aligned with the distribution’s policy. | Unbreakable Enterprise Kernel (UEK) or Red Hat Compatible Kernel (RHCK). | RHEL kernel. |
| Governance and support | Community foundation; commercial support is separate. | Oracle-backed commercial distribution. | Red Hat commercial subscription. |
| Hardware note | AlmaLinux 10 provides an x86-64-v2 build for older hardware alongside its x86-64-v3 default. | Oracle Linux 9.6 supports x86_64 and aarch64. | RHEL 10 defaults to x86-64-v3, according to AlmaLinux’s comparison documentation. |
These are documented policies and platform details, not evidence that all three distributions perform identically under every workload. The official material cited here does not establish an independent, current benchmark of equivalent performance or behavior across workloads.
What have the projects said about compatibility since the 2023 change?
AlmaLinux
The AlmaLinux OS Foundation’s 2025 announcement for AlmaLinux 10.0 says the release is fully compatible with RHEL 10. Its current comparison documentation also lists minor-version compatibility and a typical five-day delay for the last minor release. Treat that timing as the project’s typical figure, not a guaranteed release schedule.
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Oracle Linux
In a July 10, 2023 statement, Oracle said it believed Oracle Linux would remain as compatible as it had been through RHEL 9.2, while warning that the chance of compatibility issues might increase afterward. Oracle also pledged to make its distribution’s binaries and source code publicly and freely available for as long as it distributes Linux.
Oracle’s 2025 material for Oracle Linux 9.6 claims 100% application-binary compatibility with RHEL 9.6. That is Oracle’s claim for that release; it should not be read as an independent guarantee for every application, kernel module, or future version.
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How should you choose or plan a migration?
There is no universal winner. The best fit depends on the software you run, the support model you need, your hardware, and how much control you want over kernel and release choices. Compare the options against your requirements before changing production systems.
Quick Recap
- Inventory dependencies. Identify applications, third-party agents, kernel modules, hardware requirements, and vendor support conditions. Confirm which RHEL versions and architectures each dependency supports.
- Choose a compatibility target. Decide whether the priority is AlmaLinux’s stated ABI/binary-compatibility model, Oracle’s application-binary compatibility claim and kernel choice, or Red Hat’s own distribution and subscription support.
- Check hardware and kernels. Match the target release’s architecture baseline to your systems. For Oracle Linux, decide whether UEK or RHCK meets your application and operational requirements; for AlmaLinux, verify that the relevant release and kernel suit your hardware.
- Validate a representative system. Test installation, application startup, integrations, performance-sensitive work, updates, and recovery procedures in a staging environment. Include proprietary modules and agents, not just the main application.
- Confirm release and support expectations. Compare minor-version timing, update handling, and the commercial support available for the specific distribution and release you plan to deploy.
- Roll out with a recovery plan. Back up systems and data, document configuration changes, and establish rollback criteria before production migration. A compatibility policy does not replace workload-specific testing.
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