Rocky Linux vs RHEL: which server OS to pick

Rocky Linux vs RHEL: the short answer

Rocky Linux vs RHEL is a decision about who supports the server, because the software underneath is the same. For a VPS you administer yourself, choose Rocky Linux. For a server that a vendor contract or a compliance audit ties to Red Hat, choose Red Hat Enterprise Linux (RHEL). The two run the same package versions, the same kernel, the same file paths and the same ten-year lifecycle. What you buy with RHEL is a subscription: a support desk with a written response time, and the certifications an auditor can look up. What you get with Rocky is the same operating system, rebuilt from Red Hat's published source by a community foundation, at no cost and with no registration step.

That is the whole decision. The rest of this guide shows where each of those claims comes from, with the dates and terms checked against Red Hat's and Rocky's own pages in September 2026, so you can see which case applies to your server. If you want the story of how the two came to exist, the history of Red Hat, CentOS, Rocky and Alma covers the CentOS Linux shutdown that started it. This post starts where that one ends.

What RHEL is

RHEL is a commercial Linux distribution. Red Hat builds each major version from Fedora and each minor version from CentOS Stream, tests the result against a list of certified hardware and software, and sells access to the binaries and updates as a yearly subscription. Without a subscription the installed system still boots, but dnf has no repositories, and every run prints a message that starts with:

This system is not registered with an entitlement server.

Registration attaches the subscription to the machine, and the repositories appear. That gate is the product. A subscription pays for four things: the engineering that backports fixes for ten years, a support desk with a service level agreement (SLA, a written promise of how fast someone answers), the certification programme that hardware and software vendors test against, and the certificates that compliance auditors ask for.

The list price as of September 2026 depends on the support level. Self-Support costs 383.90 USD per server per year and includes updates but no support cases. Standard costs 878.90 USD and adds web and phone support during business hours. Premium costs 1,428.90 USD and adds 24x7 response for critical issues.

[
  {
    "label": "Self-Support",
    "list_price_usd": "383.90"
  },
  {
    "label": "Standard",
    "list_price_usd": "878.90"
  },
  {
    "label": "Premium",
    "list_price_usd": "1,428.90"
  }
]

Two things stand out in that table. The cheapest tier buys you updates, which Rocky gives away. The step from Self-Support to Standard is the price of having a person to call, which is the one thing a rebuild can never sell you.

The no-cost Developer Subscription and its limits

Red Hat also gives RHEL away, under conditions. The Red Hat Developer Subscription for Individuals is free, and as of September 2026 Red Hat's own FAQ states the terms. It covers "a maximum of 16 systems, physical or virtual". It is tied to one personal Red Hat account, and only one no-cost subscription can be attached to an account. Red Hat lists the intended uses as "demos, prototyping, QA, small production uses, and cloud access". It is self-supported, so there is no SLA and no support case. It expires and has to be renewed by hand. The same FAQ tells you to check your employer's policy before installing it on a company machine, because the terms are written for individuals, not organisations.

So a personal VPS can legally run real RHEL at no cost. What you do not get is the thing that makes RHEL different from Rocky: the support desk. A free RHEL box and a Rocky box are both self-supported, and one of them needs an account, a registration step, a renewal every year and a count kept under sixteen.

What Rocky Linux is

Rocky Linux is a rebuild of RHEL. The project takes the source code Red Hat publishes for each RHEL package, builds it again with the trademarks removed, and publishes the result under the Rocky name. The goal is stated as one-to-one compatibility: the same package versions and the same behaviour, including the bugs. The project is hosted by the Rocky Enterprise Software Foundation (RESF). It was founded in December 2020 by Gregory Kurtzer, who had started the original CentOS project, on the day Red Hat announced that CentOS Linux 8 would end early. Its main commercial sponsor is CIQ, which sells support contracts for Rocky separately from the free distribution.

Rocky ships with no registration. dnf works from the first boot because the repositories are public mirrors. There is no account, no registration, no system count and no yearly renewal.

Where Rocky gets its source code since 2023

In June 2023 Red Hat stopped publishing RHEL package sources to git.centos.org and made CentOS Stream the only public source repository. CentOS Stream runs slightly ahead of RHEL, so a rebuild made from it would not match a released RHEL version exactly. Red Hat customers can still download the sources of the exact packages they run, but the subscription terms restrict passing them on.

Rocky's answer, published on its site on 29 June 2023 and still the project's stated position as of September 2026, is to obtain the sources from places where subscription terms cannot restrict them. The project names two. The first is Red Hat's Universal Base Image (UBI) containers, which are RHEL packages published on Docker Hub and other registries under terms that allow redistribution. The second is pay-per-use RHEL instances on public clouds, which anyone can start, and from which the sources for every package and every erratum can be fetched. Rocky's statement says the cloud path "is the easiest for us to scale as we can do all of this through CI pipelines" (CI, continuous integration). Separately, CIQ co-founded the Open Enterprise Linux Association (OpenELA) with SUSE and Oracle in August 2023 to publish Enterprise Linux sources in the open. The effect for you is that Rocky stays downstream of released RHEL rather than of CentOS Stream, so a Rocky 9.7 package is built from the same source as a RHEL 9.7 package.

AlmaLinux made a different choice in 2023 and now aims for ABI compatibility rather than a one-to-one rebuild, which is the main difference between the two rebuilds. Rocky Linux vs AlmaLinux works through that sibling choice. The rest of this post treats them as one option against RHEL.

Release cadence and lifecycle dates

Red Hat ships a major RHEL version every three years and a minor version every six months. RHEL 8 was released on 7 May 2019, RHEL 9 on 18 May 2022 and RHEL 10 on 20 May 2025. Each major version gets ten years: five years of Full Support, when new hardware enablement and new features arrive in minor releases, then five years of Maintenance Support, when only security and critical fixes arrive. RHEL 9 leaves Maintenance Support on 31 May 2032 and RHEL 10 on 31 May 2035. After that, paying customers can buy Extended Life Cycle Support (ELS) for additional years. RHEL 8's Full Support ended on 31 May 2024 and its Maintenance Support ends on 31 May 2029.

Rocky follows the same calendar because it can only build what Red Hat has released. The Rocky wiki gives end-of-life dates that match RHEL's Maintenance Support end exactly: Rocky 8 on 31 May 2029, Rocky 9 on 31 May 2032 and Rocky 10 on 31 May 2035. Rocky's active support phase, when point releases still arrive, ends when RHEL's Full Support ends: 31 May 2027 for Rocky 9 and 31 May 2030 for Rocky 10. There is no ELS for Rocky. When RHEL 8 reaches 2029, a RHEL 8 customer can pay to keep patches coming, and a Rocky 8 server has to be upgraded or replaced.

The one real difference in timing is the lag between a RHEL release and the Rocky rebuild of it.

[
  {
    "label": "Version 9 (May 2022)",
    "release_gap": 57
  },
  {
    "label": "Version 10 (May 2025)",
    "release_gap": 22
  }
]

Rocky 9 followed RHEL 9 by 57 days, from 18 May to 14 July 2022. Rocky 10 followed RHEL 10 by 22 days, from 20 May to 11 June 2025. The gap has shrunk as the project's build system matured. Point releases and ordinary security errata are faster, usually hours to a few days, because the build pipeline is already set up for that major version. If a fix has to be on your server the same hour Red Hat ships it, that lag is a reason to pay. For almost every VPS it is not.

What "compatible" means, and what it does not

Rocky describes itself as compatible with RHEL. That word carries a precise meaning, and a few things people assume it covers are not included.

What is the same. Package names and versions match, so dnf list installed on both shows the same kernel-5.14.0 series on version 9 and the same kernel-6.12.0 series on version 10. The application binary interface (ABI, the set of library calls that compiled programs depend on) is the same, so a binary built for RHEL 9 runs on Rocky 9 without a rebuild. SELinux (Security-Enhanced Linux) policy, file paths, default configs and module streams are the same. The platform identifier is the same, which is what well-written third-party repositories check:

grep -E '^(ID|ID_LIKE|PLATFORM_ID|VERSION_ID)=' /etc/os-release

On Rocky 9 that prints ID="rocky", ID_LIKE="rhel centos fedora", VERSION_ID="9.7" and PLATFORM_ID="platform:el9". On RHEL 9 the ID is rhel and ID_LIKE is fedora, and the PLATFORM_ID line is identical. A repository or install script that keys on platform:el9 works on both. One that checks ID against a fixed list works only if that list includes rocky. One that greps /etc/redhat-release for the words Red Hat fails on Rocky, because that file reads Rocky Linux release 9.7 (Blue Onyx). When a vendor installer refuses to run on Rocky, this check is the usual cause, and it is a branding check rather than a technical one.

What is different. The branding packages: rocky-release and rocky-logos replace redhat-release and redhat-logos. subscription-manager exists in Rocky's repositories for people who register with Satellite or Foreman, but nothing requires it. Errata timing: Rocky publishes a fix after Red Hat publishes it, never before, and Rocky issues its own advisories at errata.rockylinux.org, so dnf updateinfo list --security works on both but the Rocky advisory IDs start with RLSA rather than RHSA. Red Hat Insights and kernel live patching are subscription services and are not part of the rebuild.

What compatible does not mean. It does not mean certified. Software vendors test and certify against RHEL by name, and their support matrix says RHEL. Running their product on Rocky usually works, because the ABI is the same, but when you open a ticket with that vendor the first question is which OS you are on, and the answer can close the ticket. It does not mean validated. Cryptographic module certificates under FIPS 140-3 (Federal Information Processing Standards, the US government's list of approved cryptography) are issued to a specific vendor build. RHEL's OpenSSL and kernel modules hold Red Hat's certificates. Rocky's rebuild of the same source does not inherit them, even though the code is identical, because the certificate names the build and the vendor rather than the code. If an auditor asks for the certificate number, stock Rocky has none to show, and CIQ sells a separately validated Rocky build for exactly that customer. The last gap is the obvious one: there is no vendor to call. A Rocky bug report goes to a community bug tracker and to the upstream project. That is fine for a web server. It is not fine for a system where the contract says a named vendor must respond within an hour.

Where RHEL wins

Pick RHEL when someone other than you decides. A vendor support contract that lists RHEL as the supported platform. A compliance framework that asks for FIPS certificates or a Common Criteria evaluation by name. A security baseline your organisation has written against the DISA STIG (Security Technical Implementation Guide) for RHEL. A workload like SAP HANA or Oracle Database where the vendor's certification is what your own customers audit. In all of those cases the subscription costs less than the time spent arguing with an auditor, and Standard support at 878.90 USD a year is small next to the licence for the vendor software running on top of it.

Pick RHEL, too, when you want someone to open a case with at 3 a.m. and hold to an SLA. Rocky's community answers questions, and CIQ sells support for Rocky, but the SLA you get with a Red Hat Premium subscription is a legal document. Whether you need one is a business question rather than a technical one.

Where Rocky wins

Pick Rocky for a server you administer yourself. That is the majority of VPS deployments: a web server, a mail server, a database, a container host, a build box. The packages are the same as RHEL's, the security fixes land within days, the lifecycle runs to 2032 or 2035, and nothing has to be registered. You can re-image the server ten times in an afternoon without counting entitlements, and you can clone it into a second VPS without a licence question.

SSD Nodes provisions Rocky Linux and AlmaLinux images from the control panel and does not provision RHEL. That is the normal situation at a VPS provider: RHEL's subscription is tied to a Red Hat account, so a provider cannot ship it as a stock image, and you would have to install it yourself and register it. On a fresh Rocky VPS the first job is the same as on any new server, and securing a new Rocky Linux server walks through SSH hardening and firewalld in Rocky's own vocabulary. If the server you are replacing runs CentOS Stream, migrating CentOS Stream to Rocky Linux covers the version alignment problem that makes that move more than a repository swap.

Can you switch later?

Yes, in both directions and without a reinstall. Red Hat publishes convert2rhel, a supported tool that converts a Rocky, Alma, CentOS Linux or Oracle Linux system of the same major version into a registered RHEL system by swapping the branding packages and repositories. Rocky publishes migrate2rocky and migrate2rocky9 in its rocky-tools repository, which convert an Enterprise Linux 8 or 9 system to Rocky 8 or 9. Both tools work because the packages underneath are the same: they replace a few dozen release and repository files and then resynchronise every installed package against the new repositories. Take a snapshot first, and read the tool's own README before trusting it with a production box.

That reversibility is the strongest argument for starting with Rocky. If a contract arrives later that names RHEL, the conversion is one tool and one reboot. The money you did not spend in the meantime is real.

The recommendation

For a VPS you run yourself, install Rocky Linux, or AlmaLinux if the sibling comparison linked above points you that way. For a server that a vendor contract or an auditor ties to Red Hat, buy RHEL, and buy the Standard tier rather than Self-Support, because Self-Support gives you exactly what Rocky already gives you for nothing. If you have not settled on the Enterprise Linux family at all, which OS to pick for your VPS weighs it against Debian and Ubuntu on the same terms.

FAQ

Is Rocky Linux the same as RHEL?

Functionally, yes. Rocky is rebuilt from the source code of released RHEL packages, so package versions, the kernel series, the ABI, SELinux policy and file paths match, and a binary built for RHEL 9 runs on Rocky 9. What differs is the branding packages, the absence of the subscription and registration step, a short lag before each fix is rebuilt, and the lack of Red Hat's support contract and certifications.

Is RHEL free to use on a VPS?

For an individual, yes, within limits. The Red Hat Developer Subscription for Individuals is free and, as of September 2026, covers up to 16 physical or virtual systems on one personal account, including small production use. It is self-supported and must be renewed. Organisations are not eligible. A paid subscription starts at 383.90 USD a year for Self-Support. SSD Nodes provisions Rocky Linux and AlmaLinux images but not RHEL, so RHEL on a VPS means installing and registering it yourself.

Do Rocky Linux and RHEL have the same end-of-life date?

Yes. Rocky ends each major version on the day RHEL's Maintenance Support ends: 31 May 2029 for version 8, 31 May 2032 for version 9 and 31 May 2035 for version 10. The difference is what happens after. Red Hat sells Extended Life Cycle Support for additional years, and Rocky has no equivalent, so a Rocky server must be upgraded when the date arrives.

Can I run software that is certified for RHEL on Rocky Linux?

It almost always runs, because the ABI is identical. It is not certified, because certification is granted to RHEL by name, and the vendor's support desk may decline a ticket when it learns the OS is Rocky. If the vendor's support matters more than the subscription cost, run RHEL. If you only need the software to work, Rocky is fine, and convert2rhel can turn the box into RHEL later if the situation changes.