Red Hat Enterprise Linux 10 landed in 2025, and within weeks, both Rocky Linux 10 and AlmaLinux 10 followed. All three run the same kernel, the same packages, and the same systemd. On the surface, they’re interchangeable. Beneath that surface, the differences come down to who backs the project, how fast security patches arrive, and whether you need official certifications for compliance audits.
This guide breaks down RHEL 10, Rocky Linux 10, and AlmaLinux 10 across 20 categories, from kernel version to FIPS compliance. Whether you’re choosing a distro for a new production deployment or migrating off CentOS, this comparison gives you the facts to decide. If you’re already running Rocky Linux, we have guides for installing PostgreSQL on Rocky/AlmaLinux and upgrading from Rocky Linux 8 to 9.
Updated March 2026 for RHEL 10.1, Rocky Linux 10.1, AlmaLinux 10.1
Rocky Linux 10 vs AlmaLinux 10 vs RHEL 10: Full Comparison
The table below covers the core areas where these three distributions differ (or don’t). Package versions are identical across all three since Rocky and AlmaLinux rebuild from RHEL sources.
| Category | RHEL 10 | Rocky Linux 10 | AlmaLinux 10 |
|---|---|---|---|
| Base | Upstream source | 1:1 RHEL rebuild (bug-for-bug) | ABI-compatible RHEL rebuild |
| Kernel | 6.12.x | 6.12.x | 6.12.x |
| Release Model | Major every 3 years, minor every 6 months | Follows RHEL release cadence | Follows RHEL release cadence |
| Support Lifecycle | 10 years (full + maintenance) | 10 years | 10 years |
| Cost | Subscription required (free Developer tier available) | Free | Free |
| Certifications | FIPS 140-3, Common Criteria, STIG, FedRAMP | None (inherits RHEL compatibility) | None (inherits RHEL compatibility) |
| Vendor | Red Hat (IBM) | Rocky Enterprise Software Foundation (RESF), CIQ | AlmaLinux OS Foundation, CloudLinux |
| Community Governance | Corporate (Red Hat controlled) | Community-governed via RESF board | Community-governed via AlmaLinux OS Foundation |
| Package Availability | BaseOS + AppStream + CodeReady Builder | BaseOS + AppStream + CRB (+ extras) | BaseOS + AppStream + CRB (+ extras) |
| Default Repos | BaseOS, AppStream | BaseOS, AppStream, Extras | BaseOS, AppStream, Extras |
| SELinux | Enforcing by default | Enforcing by default | Enforcing by default |
| systemd Version | 257 | 257 | 257 |
| Default Compiler | GCC 14.3.x | GCC 14.3.x | GCC 14.3.x |
| Python Version | Python 3.12 | Python 3.12 | Python 3.12 |
| Cloud Images | AWS, Azure, GCP (official marketplace) | AWS, Azure, GCP (community images) | AWS, Azure, GCP (official + community images) |
| Container Images | registry.access.redhat.com | quay.io/rockylinux | quay.io/almalinuxorg |
| Migration Tools | convert2rhel (from Rocky/Alma to RHEL) | rocky-tools (migrate from other EL distros) | almalinux-deploy (migrate from other EL distros) |
| FIPS 140-3 Compliance | Certified (official NIST validation) | Uses same crypto modules, not independently certified | Uses same crypto modules, not independently certified |
| Errata Speed | Immediate (source) | Hours to days after RHEL | Hours to days after RHEL |
| Ecosystem / ISV Support | Broadest ISV certification (Oracle, SAP, etc.) | Growing ISV awareness, not officially certified | Growing ISV awareness, not officially certified |
The package versions are identical because Rocky and AlmaLinux both compile from RHEL source RPMs. The real differences are organizational: who governs the project, who provides commercial support, and which certifications matter for your use case.
RHEL 10
Red Hat Enterprise Linux is the upstream source that Rocky and AlmaLinux rebuild from. RHEL 10 ships kernel 6.12, systemd 257, GCC 14.3, and Python 3.12. It is the only one of the three with official FIPS 140-3 certification, Common Criteria validation, and STIG profiles. If your organization needs to pass compliance audits (FedRAMP, PCI-DSS, HIPAA), RHEL is the path of least resistance because auditors recognize the certifications.
A RHEL subscription includes access to Red Hat’s support team, the Customer Portal with knowledgebase articles, and Red Hat Insights for proactive monitoring. The free Red Hat Developer Subscription covers up to 16 systems for development and testing with full access to packages. For production workloads, the Self-Support subscription starts at $349/year per server.
RHEL also has the broadest ISV ecosystem. Software vendors like Oracle, SAP, and VMware certify their products specifically against RHEL. Running those workloads on Rocky or AlmaLinux works in practice, but the vendor may decline support calls if the issue isn’t reproducible on RHEL.
Rocky Linux 10
Rocky Linux was created by Gregory Kurtzer (the original CentOS co-founder) after Red Hat shifted CentOS to CentOS Stream. The project aims to be a 1:1, bug-for-bug compatible rebuild of RHEL. Rocky 10.1, codenamed “Red Quartz,” ships the same kernel 6.12.0-124, systemd 257, and GCC 14.3.1 as RHEL 10.1.
The Rocky Enterprise Software Foundation (RESF) governs the project. RESF is a Delaware public benefit corporation with community-elected board members. CIQ, the company Kurtzer also founded, provides commercial support for organizations that want a vendor to call when things break. CIQ’s support offering mirrors what Red Hat provides: 24/7 SLA options, security advisories, and long-term support commitments.
Rocky’s build infrastructure is fully open. The project publishes its build system (Peridot) as open source, so anyone can audit how packages are built. This transparency was a direct response to concerns about CentOS Stream’s divergence from RHEL. Rocky also ships cloud images on all major providers and maintains official container images at quay.io/rockylinux.
For migrations, rocky-tools handles in-place conversions from CentOS, AlmaLinux, Oracle Linux, and other EL-compatible distributions. The process swaps repositories and re-signs packages without reinstalling the OS.
AlmaLinux 10
AlmaLinux takes a slightly different philosophical approach. Rather than promising a 1:1 bug-for-bug rebuild, AlmaLinux targets ABI compatibility with RHEL. In practice, this means binaries compiled for RHEL run on AlmaLinux without modification, but AlmaLinux reserves the right to patch bugs independently if the fix is straightforward and RHEL hasn’t addressed it yet. The distinction is subtle and rarely matters in daily use, but it’s worth knowing.
AlmaLinux is backed by CloudLinux, the company behind the CloudLinux OS used by hosting providers. The AlmaLinux OS Foundation governs the project independently from CloudLinux, with a community board and transparent financials. CloudLinux committed $1M/year in ongoing funding, and the foundation accepts sponsorships from other companies.
AlmaLinux was the first CentOS alternative to ship after the CentOS Stream announcement, which gave it an early adoption advantage. The project maintains almalinux-deploy for migrating from CentOS, Rocky, Oracle Linux, and even CentOS Stream. AlmaLinux also provides ELevate, a tool for upgrading between major EL versions (e.g., EL8 to EL9, EL9 to EL10), which neither Rocky nor RHEL offers as a community tool.
Cloud image availability is strong. AlmaLinux publishes official images on AWS Marketplace, Azure, and GCP, with both x86_64 and aarch64 variants. Container images are available at quay.io/almalinuxorg.
Key Differences That Matter in Practice
Errata and Security Update Speed
RHEL publishes security errata first because it’s the source. Rocky and AlmaLinux rebuild those patches from RHEL’s source RPMs, which introduces a delay. Both projects typically ship updates within hours for critical CVEs and within a few days for routine errata. During the RHEL 9.x cycle, both Rocky and AlmaLinux consistently delivered critical patches within 24 to 72 hours. Neither project has had a significant delay on a high-severity CVE.
For most workloads, this lag is irrelevant. If you’re running internet-facing servers where a 24-hour patch delay on a critical kernel CVE is unacceptable, RHEL gives you the fastest response. For internal infrastructure, development environments, and most production servers behind proper network segmentation, Rocky or AlmaLinux’s turnaround is perfectly adequate.
Certifications and Compliance
This is the clearest dividing line. RHEL has FIPS 140-3 validated cryptographic modules, Common Criteria certification, published STIG profiles, and FedRAMP authorization. Rocky and AlmaLinux use the exact same cryptographic code (since they rebuild RHEL’s packages), but they have not independently submitted for NIST validation. The crypto is functionally identical, but the paperwork isn’t there.
If your compliance framework requires a certified operating system (common in government, defense, healthcare, and finance), RHEL is the only option among these three. If your auditors accept “binary-compatible with a FIPS-validated distribution” as sufficient, Rocky or AlmaLinux may work, but confirm with your compliance team first.
Commercial Support Options
All three have paid support available, just from different vendors. RHEL support comes directly from Red Hat, with multiple tiers from self-support to premium 24/7. CIQ offers commercial support for Rocky Linux with similar SLA options. CloudLinux (through TuxCare) offers support for AlmaLinux, including extended lifecycle support beyond the standard 10-year window.
The practical difference: Red Hat support is the largest team with the deepest kernel expertise. CIQ and CloudLinux/TuxCare are smaller but focused, and both employ experienced enterprise Linux engineers. For most support scenarios (package conflicts, service configuration, performance tuning), all three deliver comparable quality.
Migration Tools
Each distribution provides tools for converting between EL-compatible distros:
- convert2rhel – Red Hat’s official tool for migrating Rocky, AlmaLinux, CentOS, or Oracle Linux to RHEL
- rocky-tools – Converts CentOS, AlmaLinux, or Oracle Linux to Rocky Linux
- almalinux-deploy – Converts CentOS, Rocky, or Oracle Linux to AlmaLinux
- ELevate (AlmaLinux) – Cross-major-version upgrades (EL8 to EL9, EL9 to EL10), works across all EL distros
AlmaLinux’s ELevate stands out here. Upgrading between major RHEL versions has historically required a fresh install. ELevate (built on Red Hat’s Leapp framework) automates in-place upgrades and works for Rocky, CentOS, and Oracle Linux, not just AlmaLinux. This is a genuine differentiator for organizations managing large fleets.
Which One Should You Choose?
The decision framework is straightforward once you identify your constraints.
Choose RHEL 10 if your organization requires officially certified FIPS 140-3 compliance, Common Criteria validation, or STIG profiles. Government contracts, defense projects, and regulated industries (healthcare, finance) typically mandate these certifications. The free Developer Subscription covers development and testing, so cost only applies to production systems. ISV-certified software (SAP, Oracle Database) also runs best on the platform the vendor tests against.
Choose Rocky Linux 10 if you want a 1:1 RHEL rebuild without subscription costs. Rocky is the closest spiritual successor to the original CentOS model. The RESF’s community governance and CIQ’s commercial support option make it a solid choice for production servers where budget matters but you still want the option to purchase support if needed.
Choose AlmaLinux 10 if you value the ABI-compatible approach (which allows independent bug fixes) and want access to the ELevate upgrade tool. AlmaLinux’s early track record, CloudLinux’s financial backing, and TuxCare’s extended support make it equally viable for production use. The AlmaLinux OS Foundation’s transparent governance and financial reporting are a plus for organizations that want long-term project stability assurance.
For development and testing, pick whichever you prefer. The three distributions are functionally identical at the package level. Your Ansible playbooks, container images, and CI pipelines will work across all three without modification. Many teams run RHEL in production with the Developer Subscription and use Rocky or AlmaLinux for CI/CD runners, staging environments, and developer workstations to avoid consuming subscription entitlements.
Migrating from CentOS? Both Rocky and AlmaLinux provide in-place migration tools. Rocky positions itself as the direct CentOS replacement (same founder, same philosophy). AlmaLinux offers the ELevate tool for cross-version upgrades, which is valuable if you’re still on CentOS 7 or 8 and need to reach EL10. Either choice gets you to a supported, long-lifecycle platform.
