You narrowed your Enterprise Linux shortlist to two names that look identical on paper: AlmaLinux and Rocky Linux. Both are free, both use dnf and SELinux, both track RHEL 9 and 10, and both exist because CentOS Linux left the downstream-clone role. The choice that sticks in production is not logo color—it is compatibility philosophy, what your control panel certifies, how fast you need security updates, and whether your hardware meets EL10 CPU baselines.
This guide compares AlmaLinux and Rocky Linux for servers—web hosting, databases, Kubernetes nodes, and traditional VM workloads—not desktop politics. I cross-checked support dates and architecture notes against AlmaLinux release notes and Rocky Linux release notes; command examples match our Rocky Linux 9 lab from the Rocky Linux 8 install walkthrough. If you are still deciding between Enterprise Linux and Ubuntu, read AlmaLinux vs Ubuntu first—that is a different fork entirely.
Tested on: Rocky Linux 9.4 (Blue Onyx); kernel 5.14.0;
dnf4.14.x (lab per install guide).
Quick answer: AlmaLinux vs Rocky Linux
Pick AlmaLinux 9 or 10 when you run cPanel/WHM on supported branches, want ABI-oriented RHEL compatibility with room to ship security fixes without waiting for strict clone parity, or your organization already standardized on Alma after the CentOS transition. AlmaLinux 10 also offers x86_64_v2 media for older 64-bit servers.
Pick Rocky Linux 9 or 10 when you want the closest 1:1 RHEL binary clone model, prefer RESF governance and the Rocky community toolchain, or your ISV documentation names Rocky explicitly—and you are not blocked by cPanel 134+ (which no longer supports Rocky).
If you need Debian-family apt instead of dnf, neither distro fits—see Debian 12 vs Ubuntu 24.04 LTS.
AlmaLinux vs Rocky Linux at a glance
| Topic | AlmaLinux 9 | AlmaLinux 10 | Rocky Linux 9 | Rocky Linux 10 |
|---|---|---|---|---|
| Upstream goal | ABI compatible with RHEL | ABI compatible with RHEL | 1:1 binary compatible with RHEL | 1:1 binary compatible with RHEL |
| Governance | AlmaLinux OS Foundation (501(c)(6)) | Same | Rocky Enterprise Software Foundation | Same |
| Package tool | DNF / RPM | DNF / RPM | DNF / RPM | DNF / RPM |
| MAC / firewall | SELinux + firewalld | SELinux + firewalld | SELinux + firewalld | SELinux + firewalld |
| Active support ends | 31 May 2027 | 31 May 2030 | 31 May 2027 | 31 May 2030 |
| Security support ends | 31 May 2032 | 31 May 2035 | 31 May 2032 | 31 May 2035 |
| Typical GA kernel | 5.14.x | 6.12.x | 5.14.x | 6.12.x |
| x86_64 baseline (EL10) | x86_64 + x86_64_v2 images | Same | x86_64_v3 (+ riscv64, etc.) | Same |
| cPanel/WHM (v134+, 2026) | Supported (8/9/10) | Supported | Not supported | Not supported |
| In-place from Rocky | almalinux-deploy |
almalinux-deploy |
— | — |
| In-place from CentOS 8 | almalinux-deploy |
Fresh install / ELevate paths | migrate2rocky | Fresh install typical |
Sources: AlmaLinux release notes, Rocky Linux release notes, cPanel release notes.
Where each distro came from
AlmaLinux
AlmaLinux launched in 2021 after Red Hat shifted CentOS Linux to CentOS Stream. The AlmaLinux OS Foundation is a 501(c)(6) nonprofit; CloudLinux provides engineering and financial backing alongside other sponsors.
In 2023 AlmaLinux announced a shift from marketing itself as a strict downstream 1:1 RHEL rebuild to ABI compatibility with RHEL—applications and kernel modules built for RHEL should run on AlmaLinux; if they do not, Alma treats that as a bug. Packages are built from CentOS git sources with de-branding, per the AlmaLinux FAQ.
Rocky Linux
Rocky Linux was founded by Gregory Kurtzer, a CentOS co-founder, under the Rocky Enterprise Software Foundation (RESF). Rocky’s stated goal is 1:1 binary compatibility with RHEL—closest to the old CentOS Linux mental model.
Rocky builds with its own Peridot toolchain and publishes cloud images through the Rocky SIG ecosystem. Commercial support is available through partners such as CIQ rather than from the RESF directly.
Why both still exist
After CentOS Linux ended, the Enterprise Linux community split into “ABI-flexible rebuild” (AlmaLinux) and “strict clone” (Rocky) camps. For many workloads the resulting systems are interchangeable; for hosting panels, CPU baselines on EL10, and patch timing, they are not.
Compatibility philosophy: ABI vs 1:1 binary clone
This is the technical divide competitors gloss over with a single “RHEL compatible” bullet.
AlmaLinux — ABI compatibility
AlmaLinux guarantees that software targeting RHEL should run unchanged—same ABI expectations for userspace and kernel modules—but Alma can:
- Ship security or bugfix updates on a different schedule than strict byte-for-byte parity with every RHEL RPM.
- Reintroduce drivers or userspace choices RHEL dropped when hardware or ABI still matters to Alma users (documented on major releases such as 9.4 and 10.0).
For operators, that usually means faster critical fixes and occasional package Release field differences (.alma suffix). Rare scripts that checksum exact RHEL NVR strings may need adjustment.
Rocky Linux — binary parity with RHEL
Rocky aims to mirror RHEL builds as closely as possible. Teams that audit rpm -qi against Red Hat NVRs, run ISV installers that sniff for exact RHEL fingerprints, or want “whatever RHEL shipped” without rebuild variance gravitate here.
Trade-off: you wait on Rocky’s rebuild pipeline after RHEL publishes—typically fast (often within a day), but still tied to upstream publication.
dnf install nginx, and EPEL usage look identical until you hit panel support or EL10 CPU media choices.
Support timelines and release cadence
Do not pick “Alma” or “Rocky” without a major version. AlmaLinux 9 and Rocky 9 are not interchangeable with version 10 for ISV matrices or kernel baselines.
Published end dates (major versions)
| Major | Active support until | Security support until |
|---|---|---|
| AlmaLinux 9 / Rocky 9 | 31 May 2027 | 31 May 2032 |
| AlmaLinux 10 / Rocky 10 | 31 May 2030 | 31 May 2035 |
| AlmaLinux 8 / Rocky 8 | Active support ended May 2024 | 31 May 2029 |
Minor releases (9.7 → 9.8) deliver ongoing fixes within the major line. Plan 9 → 10 upgrades as a migration project—use Alma ELevate or Rocky’s documented upgrade paths when available, and test on staging first.
Verify what you actually installed
On either distro the first sanity check is the same shape—only the release file path differs:
# AlmaLinux
cat /etc/almalinux-release
uname -r
# Rocky Linux
cat /etc/rocky-release
uname -rExample from a Rocky Linux 9 lab host:
Rocky Linux release 9.4 (Blue Onyx)
5.14.0-427.el9.x86_64An AlmaLinux 9 machine reports AlmaLinux release 9.x with a similar 5.14.0-*.el9 kernel line. Always trust the VM you provision, not a blog table frozen at publish time.
Architectures and hardware baselines
Both projects ship aarch64, ppc64le, and s390x on current majors—parity matters if you run IBM Z or ARM cloud instances.
The sharp EL10 split is x86_64:
| EL10 x86_64 offering | AlmaLinux 10 | Rocky Linux 10 |
|---|---|---|
| Default 64-bit ISO / cloud | x86_64 (v3-class) | x86_64_v3 |
| Older 64-bit CPUs (v2) | x86_64_v2 images available | Not targeted for EL10 |
| Other arches | aarch64, ppc64le, s390x, i686 userspace* | aarch64, ppc64le, s390x, riscv64 |
* AlmaLinux documents i686 as userspace-only without a 32-bit kernel—see release notes.
RHEL 10 raised the x86 baseline toward x86_64_v3 (roughly Intel Haswell / AMD Excavator era and newer). If you still host on older metal, AlmaLinux 10 x86_64_v2 may be the only EL10 option without hardware refresh. Rocky 9 remains on x86_64-v2 through the 9.x line for older fleets that are not ready for EL10.
Day-to-day administration: what is actually different?
Almost nothing in routine ops—which is why the choice is strategic, not syntactic.
| Task | AlmaLinux | Rocky Linux |
|---|---|---|
| Install package | sudo dnf install nginx |
Same |
| Enable service | sudo systemctl enable --now nginx |
Same |
| SELinux context issues | ausearch, restorecon, booleans |
Same |
| Extra packages | EPEL, CRB/PowerTools patterns | Same — see EPEL on Rocky |
| Roll back bad update | DNF/YUM history | Same |
| Local mirror | Your choice of Alma or Rocky mirrors | Mirror count differs; pick geographically close mirrors |
Differences show up in vendor support statements, panel installers, migration scripts, and which ISO you download—not in how you restart sshd.
Security, compliance, and patching speed
Both inherit RHEL’s security stack: SELinux enforcing policies, crypto-policies, OpenSCAP content, and audited update channels.
| Topic | AlmaLinux | Rocky Linux |
|---|---|---|
| Errata / advisories | AlmaLinux errata, OVAL streams | Rocky errata |
| FIPS | AlmaLinux 9.2+ FIPS 140 compliant builds (see Alma wiki) | Follow Rocky + RHEL guidance for your version |
| Patch philosophy | ABI model allows proactive security fixes | Rebuild after RHEL sources publish |
| Typical lag after RHEL | Often within 24–48 hours (Alma FAQ cites ~day) | Often same-day goal via Peridot |
For compliance questionnaires, cite the major version and link vendor errata for the distro you standardized on—auditors care about CVE closure SLAs, not mascot.
Web hosting, cPanel, and shared hosting
This is the largest practical gap in 2026.
cPanel version 134 (released January 2026) discontinued support for Rocky Linux 8 and 9. New installs and upgrades to cPanel 134+ on Rocky are blocked. Existing Rocky servers on older cPanel versions may keep running but will not receive panel updates until you migrate.
Still supported on current cPanel branches (examples):
- AlmaLinux 8, 9, 10
- CloudLinux 8, 9, 10
- Ubuntu 22.04 / 24.04 LTS (verify current docs for your target version)
For WHM/cPanel shops, AlmaLinux is the direct Rocky replacement—cPanel documents in-place conversion via almalinux-deploy. Take backups, run on staging, and schedule maintenance.
| Hosting scenario | Practical pick |
|---|---|
| New cPanel dedicated server (2026) | AlmaLinux 9 or 10 |
| Legacy Rocky + cPanel stuck below v134 | Plan Alma migration before you need panel CVEs |
| Raw nginx + PHP-FPM, no panel | Either EL9 distro; match fleet and mirrors |
| Plesk | Check Plesk OS matrix for your license tier—both were historically supported |
Our AlmaLinux vs Ubuntu guide covers Ubuntu on cPanel when you are comparing outside the RHEL clone family.
Migration and coexistence
| From | To AlmaLinux | To Rocky Linux |
|---|---|---|
| CentOS Linux 8 | almalinux-deploy | migrate2rocky |
| Rocky Linux 8/9 | almalinux-deploy (common for cPanel moves) |
— |
| AlmaLinux | — | No official in-place “to Rocky” path—reinstall or restore |
| CentOS 7 | ELevate / reinstall | Reinstall (no Rocky 9 in-place from 7) |
| RHEL (licensed) | Test compatibility; snapshot first | Test compatibility; snapshot first |
You cannot dnf swap between Alma and Rocky like flipping a repo flag—treat cross-grade as migration: backup, test almalinux-deploy or reprovision, validate workloads.
AlmaLinux vs Rocky Linux: workload guide
| Workload | AlmaLinux | Rocky Linux |
|---|---|---|
| cPanel / WHM (new 2026 builds) | Strong | Not supported on v134+ |
| ISV apps certified for “RHEL 9” | Strong | Strong |
| Strict RHEL binary audit requirements | Good (verify ABI policy) | Strongest clone match |
| Older x86 servers on EL10 | Strong (x86_64_v2 media) | Weak unless hardware is v3+ |
| HPC / CIQ-centric support | Good (partner ecosystem) | Strong (CIQ + RESF) |
| Kubernetes / container nodes | Equal OCI capability | Equal OCI capability |
| Oracle DB / SAP-style EL matrices | Match vendor wording | Match vendor wording |
| Homelab EL learning | Either; pick one per fleet | Either |
| Mirror diversity | Large mirror network (Alma wiki) | Growing mirror network |
What most comparison articles gloss over
- cPanel 134+ vs Rocky — Rocky is out for new panel life; plan Alma or CloudLinux, not forum posts from 2023.
- ABI vs binary clone — only matters for a subset of ISV audits and rebuild timing; both run normal
dnfstacks. - EL10 CPU baselines — Alma’s x86_64_v2 ISO is a real differentiator for aging hardware; Rocky 10 assumes newer x86_64_v3.
- Picking “9” vs “10” — saying “we run Rocky” without a major version is meaningless for support and certifications.
- Ubuntu is still a third path — if panel supports Noble and your team wants
apt, compare AlmaLinux vs Ubuntu. - Mirror and regional speed — test
dnf makecachefrom your DC; mirror geography beats benchmark blogs. - Cloud images — both publish official AWS/Azure/GCP images; neither is the universal default the way Ubuntu often is.
Summary
AlmaLinux and Rocky Linux solve the same headline problem—a free Enterprise Linux base when CentOS Linux is gone—but they diverge on compatibility philosophy, hosting panel support, and EL10 hardware baselines. Choose AlmaLinux when cPanel, ABI flexibility, or x86_64_v2 on EL10 drives your roadmap. Choose Rocky Linux when you want the strictest RHEL clone story and your stack does not depend on cPanel 134+.
Provision one VM of each on your cloud SKU, run your playbook (panel install, database, agents), and compare mirror speed, ISV installer behavior, and support end dates—not mascot polls.
Official references: AlmaLinux Wiki, Rocky Linux documentation, cPanel release notes, almalinux-deploy.
On-site next steps: AlmaLinux vs Ubuntu, migrate CentOS to Rocky Linux, install Rocky Linux.
