What Is CentOS Stream? What Happened to CentOS and What to Do Next

What is CentOS Stream, and is it the same as CentOS Linux?

CentOS Stream is a continuously updated Linux distribution that ships changes planned for the next minor release of Red Hat Enterprise Linux (RHEL) before RHEL gets them. Classic CentOS Linux was a rebuild of RHEL after release. In other words, CentOS Stream runs slightly ahead of RHEL, not behind it.

That difference sounds small. However, it changes how you run a server. The old CentOS Linux took packages that had already shipped in RHEL, removed the branding and offered them for free. As a result, companies got a system that matched RHEL without paying for a subscription. CentOS Stream sits at a different point in that chain. So when someone says "we run CentOS", you now need to ask which CentOS they mean.

In this guide we walk through what changed and when, based on official CentOS Project announcements. We also cover who should use CentOS Stream and how to plan if you still run a CentOS 7 server. We are a digital marketing and web team, not a hosting company. That is why we tie every date and claim to primary sources.

What happened to CentOS, and why does it still matter?

In short, the CentOS Project moved its focus from classic CentOS Linux to CentOS Stream. That decision rewrote the roadmap of a distribution that many people treated as "free RHEL" for years. The impact reached far, because control panels such as cPanel and Plesk ran on CentOS for a long time.

The change had three main outcomes:

• CentOS Linux 8 reached end of life far earlier than many users expected, at the end of 2021.
• CentOS Linux 7 continued through the RHEL 7 lifecycle and stopped receiving updates on June 30, 2024.
• New major versions now arrive only as CentOS Stream. There is no classic CentOS Linux 9.

These three points shape the first question for any server that still carries the CentOS name. Which version does it run, and does it still get security updates? In addition, new community distributions such as AlmaLinux and Rocky Linux appeared to fill the gap. Therefore this is not just a rename. It is an infrastructure decision that affects security, budgets and maintenance work.

How did classic CentOS Linux work?

The classic model followed a simple flow. First, Red Hat released a new RHEL minor version. Then the CentOS team took the open source code, stripped out the Red Hat branding and rebuilt it. As a result, the output matched RHEL at the package level but came without a support contract.

This model suited two groups. The first group was developers who wanted to test RHEL software in a free environment. The second group was companies that managed their own servers and did not need vendor support. For example, many hosting providers built their shared servers on CentOS.

That said, the model had a built in delay. Because CentOS followed RHEL, every new RHEL release needed time for rebuilding and testing. Also, CentOS users had few direct ways to influence RHEL. To report a problem, you often had to go to Fedora or an upstream project first.

The official CentOS comparison page describes the same gap. CentOS Linux was a downstream rebuild of RHEL, while CentOS Stream is the public development branch upstream of it. Put simply, classic CentOS borrowed its stability from RHEL. Stream takes part in the process that creates that stability. Most of the practical differences you will read about come from this change in position.

What did the announcement that changed the project actually say?

In an official blog announcement dated December 8, 2020, the CentOS Project said that the future of the project is CentOS Stream. According to the post, CentOS Stream tracks just ahead of the current RHEL release and serves as the upstream development branch of RHEL.

The practical part was clear. CentOS Linux 8, as a rebuild of RHEL 8, would end at the end of 2021. CentOS Linux 7 would continue through the remainder of the RHEL 7 lifecycle. For CentOS Linux 8 users, the suggested path was CentOS Stream 8, which the post described as a small delta from CentOS Linux 8.

One common mistake is worth fixing here. Some articles date this announcement to December 2021. In fact, the announcement came in December 2020, and December 2021 is the end of life date for CentOS Linux 8. So users had roughly one year to plan a migration.

Meanwhile, the tone of the post mattered too. The project framed the decision as a new contribution model for the RHEL ecosystem, not as a shutdown. On the other hand, server owners asked a different question. Where would a stable, free, RHEL compatible system come from now? The answer lies in RHEL itself, AlmaLinux and Rocky Linux, which we cover later.

Why did CentOS Linux 8 end so early?

The early end of CentOS Linux 8 followed directly from the decision to put project resources into Stream. The CentOS Linux end of life page states the date plainly: CentOS Linux 8 reached end of life on December 31, 2021.

In addition, that page explains how the shutdown worked:

• The project committed to shipping a rebuild of RHEL 8.5 once Red Hat released it, even if that meant shipping slightly after the end of life date.
• It kept the content on regular mirrors until January 31, then moved it to vault.centos.org as a permanent archive with no further updates.
• It stated that, in line with earlier releases, it would not migrate anyone to the next version automatically.

That last point matters. End of life does not switch a server off, and the machine keeps running. However, no new security patches arrive, and the repositories move to an archive. As a result, a team that installed CentOS 8 and forgot about it may feel safe because "everything still works".

If you still find a server on CentOS Linux 8 today, treat it as urgent maintenance. In most cases the lowest risk path is a planned move to a supported distribution in the same family.

When did CentOS Linux 7 reach end of life?

CentOS Linux 7 reached end of life on June 30, 2024. The CentOS Project published a reminder post in April 2023 that states it clearly. After that date there are no more updates for CentOS Linux 7, and the packages move to the vault.centos.org archive.

The same post also gives a date for CentOS Stream 8. Builds for CentOS Stream 8 ended on May 31, 2024, and the release moved to the archive. So two different CentOS releases ended within the same summer.

The long life of CentOS 7 made it extremely common in hosting. Many shared hosting servers, internal company tools and older online shops stayed on it. Also, because the early CentOS 8 shutdown did not affect version 7, many teams postponed their migration. Today that delay comes back as technical debt.

The post listed several options. You could migrate to CentOS Stream 9, convert to RHEL or move to another Enterprise Linux derivative. In addition, it mentioned converting to RHEL 7 and buying Red Hat Extended Lifecycle Support (ELS) if you could not migrate in time. Scope and pricing for ELS depend on Red Hat sales, so we do not quote any numbers here.

How does CentOS Stream relate to RHEL?

CentOS Stream sits between Fedora Linux and RHEL. The project download page and overview pages describe it as a continuously delivered distro that tracks just ahead of RHEL development. The project calls this position "midstream".

You can picture the flow like this:

1. New ideas and large changes land in Fedora Linux first. Fedora is the fast moving upstream distribution.
2. The next RHEL major version branches from Fedora. A new CentOS Stream major version starts at that point.
3. Updates planned for the next RHEL minor release arrive in Stream first.
4. Finally, those changes ship in the RHEL minor release with enterprise support.

Therefore it is fair to describe Stream as a preview of the next RHEL minor release. The CentOS comparison page also says that Stream contains content planned for upcoming RHEL minor releases. For a team that builds software for RHEL, this is useful. You see changes before RHEL customers do, and you can run your compatibility tests early.

That position also explains the trade offs. You get earlier access and a direct way to contribute. In return, you accept a steady flow of updates instead of a few large, scheduled steps.

How do CentOS Linux and CentOS Stream compare side by side?

Putting the two distributions next to each other makes the differences clear. For example, the table below draws on the official CentOS comparison and end of life pages:

Above all, the most important row is update cadence. With classic CentOS, the system took one large step at the same time as each RHEL minor release. With Stream, packages flow in as they become ready. That means you need different habits for testing, change control and maintenance windows.

How long does each CentOS Stream release get support?

Stream is not an endless rolling release. Each major version has an end date. The CentOS download page ties these dates to the end of the RHEL full support phase. According to the current page, the picture looks like this:

• CentOS Stream 8: builds ended on May 31, 2024, and the release is archived.
• CentOS Stream 9: May 31, 2027 (end of the RHEL 9 full support phase).
• CentOS Stream 10: May 31, 2030 (end of the RHEL 10 full support phase).

Still, these dates are shorter than the total RHEL lifecycle. That is because RHEL moves into a maintenance phase after full support and keeps getting security fixes there. Stream, by contrast, only makes sense while it feeds the next RHEL minor release. Once RHEL stops adding features to that major version, the matching Stream release ends.

In practice, a server you build on Stream 9 today will need a major version upgrade within a few years. We also suggest that you confirm these dates on the official page, because the project may update the details. If you want a long lived server that you set up once and rarely touch, this short cycle is a key decision factor.

Is CentOS Stream suitable for production?

There is no one word official answer. The CentOS comparison page says changes reach Stream and RHEL only after rigorous testing, both inside Red Hat and in a public distro wide test suite. At the same time, the official pages do not clearly recommend or forbid production use. Instead, they position Stream as a platform for taking part in the RHEL ecosystem.

Our reading is simple. Stream is not an unstable test build. However, its main audience is teams that want to see the future of RHEL early and contribute to it. If you plan to run it in production, answer these questions honestly:

• Do you have people who can test the steady flow of updates in staging before they reach production?
• Is your application certified for a specific RHEL minor release, with a vendor that only supports that release?
• Can you handle a major version upgrade every few years?
• Will you need a commercial support line when something breaks?

If you answer "no" to two of these, RHEL or a distribution that targets binary compatibility with RHEL is usually the easier choice. On the other hand, Stream works well for CI pipelines, software compatibility testing and development servers.

Where do AlmaLinux, Rocky Linux and RHEL fit in?

Two community distributions stepped in to fill the space that CentOS Linux left behind: AlmaLinux and Rocky Linux. Specifically, both aim to deliver a free, long supported server operating system compatible with RHEL. RHEL itself remains the commercial product that Red Hat sells by subscription. Roughly speaking, Stream runs ahead of RHEL, while AlmaLinux and Rocky Linux took the spot behind RHEL where classic CentOS used to sit.

How to install them, how to migrate from CentOS and how they differ are separate topics. In this same series we cover an AlmaLinux install and migration guide and a Rocky Linux versus AlmaLinux comparison in detail. Here we only give you the map. Whatever distribution you pick, you also need the right type of server. Our guide to VPS, VDS and cloud servers helps with that choice.

Keep one more point in mind. Governance, update speed and long term sustainability matter as much as the name. For example, do not choose a distribution before you check which ones your hosting control panel officially supports in its own documentation. If the panel does not support it, even the best distribution is the wrong choice for you.

What risks does a server still running CentOS 7 face?

The biggest risk is that security updates no longer arrive. After June 30, 2024, CentOS Linux 7 gets no new patches. Consequently, every vulnerability found after that date stays open on your server for good. If you host a website, this turns straight into customer data and reputation risk.

We group the risks into four areas:

• Security: Core components such as the kernel, OpenSSL, OpenSSH and the web server stay unpatched.
• Compatibility: New PHP, Node.js or database versions may not work with old system libraries.
• Package access: The repositories now live in an archive, so installing packages and resolving dependencies gets harder.
• Audits and contracts: Payment providers or enterprise customers may flag an unsupported operating system in a review.

Fixing application level issues does not fix operating system issues. For the application layer we recommend our OWASP Top 10 guide. Still, those measures stay incomplete while an unpatched system sits underneath. Your TLS setup also depends on old libraries. You can check your certificate and protocol settings quickly with our SSL checker.

How can you tell which CentOS version your server runs?

Start with an inventory. Connect over SSH and read the operating system details. The commands below read standard Linux files and change nothing on the system:

cat /etc/os-release
cat /etc/redhat-release
uname -r

Specifically, the first command shows the distribution name and version. If the NAME line says "CentOS Linux", you run classic CentOS. If it says "CentOS Stream", you run Stream. The second command prints a short release line on RHEL family systems. The third one prints the running kernel version.

Next, check which services listen on the network:

ss -tulpn

In practice, this list becomes the first draft of what you need to move: web server, database, mail, FTP and any custom applications. If you manage several servers, put the results in a spreadsheet. That way you see at a glance which machine runs which version and which services.

On shared hosting you may not have access to these commands. In that case, the right step is to ask your hosting provider in writing which operating system the server runs and what their migration plan looks like.

Where should your CentOS migration plan start?

A migration is a project, not a single command. So we recommend planning first and acting second. The order below gives a sensible frame for small and mid sized web projects:

1. Inventory: List servers, OS versions, running services and dependencies.
2. Backup: Take a full backup of files and databases, then test a restore in a separate environment.
3. Target: Choose between RHEL, AlmaLinux, Rocky Linux or Stream.
4. Method: Decide whether you convert in place or build a new server and move the workload.
5. Testing: Run the application on the target system and check forms, checkout steps and email.
6. Cutover window: Pick the lowest traffic hour and prepare DNS changes and a rollback plan.
7. Monitoring: Watch error logs and performance for several days after the move.

Never skip the backup step. Our website backup strategy guide is a good place to set frequency and storage. Also, with a jump as large as CentOS 7 to a current release, building a fresh server and moving the workload often gives a more predictable result than an in place conversion. You avoid carrying old configuration leftovers into the new system.

Which option makes sense for which team?

Matching options to needs makes the decision easier. Instead, treat the list below as a general map, not a strict recipe:

• RHEL: For enterprise teams that want a support contract, certified software and a long lifecycle.
• AlmaLinux or Rocky Linux: For teams that want a free, long supported, RHEL compatible server and want to keep classic CentOS habits.
• CentOS Stream: For software teams that want to test the near future of RHEL early, for CI environments and for contributors.
• RHEL developer subscription: For individuals who want hands on RHEL experience and run personal projects.

There is also the option of leaving the RHEL family. For example, moving your application into containers can reduce your dependence on the host operating system. Our Docker guide covers the basics. However, a container also relies on a base image, so keeping that image current and supported is still your job.

In short, the right choice depends on your team's maintenance capacity and your support expectations. We suggest you discuss those two questions before you debate distribution names.

Who benefits from the no cost RHEL developer subscription?

Red Hat offers a no cost developer subscription for individuals. According to the official Red Hat Developer FAQ, it lets you install software from the subscription, including RHEL, on 16 physical or virtual nodes.

Next, the same page spells out the limits:

• You may use RHEL from this subscription for development, testing and small production use cases.
• Only one no cost individual developer subscription can sit on a Red Hat user account.
• Red Hat designed it for individuals and personal accounts, not for organizations, businesses or enterprises.
• It includes no service level agreement and no professional support, so you support yourself.

Therefore a company should not base its production servers on this subscription. On the other hand, it makes sense for a freelance developer testing projects on RHEL, a student learning system administration or someone running a small personal service. Terms can change over time, so read the current conditions on Red Hat's own page before you install.

For business use, talking to Red Hat sales or choosing one of the community distributions is the healthier route.

Will a server migration affect your website and SEO?

A well planned operating system migration does not hurt your rankings on its own. Search engines do not care which distribution your server runs. They care about availability, speed and content. However, a poorly managed migration can cause real damage indirectly.

For instance, these are the risks we see most often:

• Long outages and 5xx errors that crawlers run into.
• Missing redirects on the new server, for example from HTTP to HTTPS or to the www version.
• Slow pages caused by misconfigured caching and compression.
• Forgotten SSL certificate renewal jobs.

To reduce these risks, list your most important URLs before the move and check the same list one by one afterwards. In addition, if you plan a DNS change, lowering the TTL in advance shortens your rollback time. To understand server side slowdowns, read our article on server side causes of a slow website. If you want to run the technical move alongside organic traffic tracking, our SEO consulting work includes a pre and post migration checklist.

Why do repositories and mirrors matter during migration?

RHEL family distributions get packages from repositories, and repositories come from mirror servers. When CentOS Linux 7 and 8 reached end of life, the project moved the content to the vault.centos.org archive. So it is no surprise when an old CentOS server throws repository errors as you try to install a package.

Some teams "fix" this by pointing the repository to the archive. That can help you install an old package temporarily. Still, the archive contains no new security patches. In other words, it does not remove the problem, it only hides the error message. Use the archive only as a short, deliberate step during a migration.

Once you move to a new distribution, choosing a nearby and reliable mirror affects update speed. Also, in company networks a local mirror stops many servers from downloading the same packages again and again. We explain this in detail in our Linux package mirror guide.

Finally, remember third party repositories. If the old system used EPEL or a PHP repository, check the equivalent and its current support on the target distribution as well.

When should you not do this yourself?

Let us be honest: not every CentOS migration needs the site owner at the keyboard. Sometimes the best decision is to leave the work to your hosting provider or an experienced system administrator.

Specifically, we suggest you do not do it yourself in these cases:

• You use shared hosting. The server operating system is already your provider's responsibility.
• You pay for managed VPS or managed server service. Ask the provider for the migration plan in writing.
• The server runs cPanel, Plesk or a similar panel licensed through the provider. In that case, your provider knows which target distribution the panel supports.
• The system takes payments or processes personal data, and nobody on your team has Linux experience.

If, instead, you run your own VPS, take regular backups and can build a staging environment, you can handle the migration step by step. If you plan a fresh start on the hosting side, our guide to choosing web hosting helps you weigh operating system support too. If your application is custom built, our custom software development team can review code compatibility on the new system with you.

So which path should you choose for CentOS Stream and CentOS migration?

To sum up, CentOS Stream is a continuously updated distribution that runs ahead of RHEL and previews its next minor release. Classic CentOS Linux no longer exists. CentOS Linux 8 reached end of life on December 31, 2021, and CentOS Linux 7 followed on June 30, 2024.

In practice, three questions drive the decision. First, do you need commercial support? If yes, choose RHEL. Second, do you want a free, long lived, RHEL compatible server? Then look at AlmaLinux or Rocky Linux. Third, do you want early access to the near future of RHEL and a way to contribute? In that case, Stream is the right fit.

If you still run a server on CentOS 7 or 8, do not treat it as something you can postpone. Start with inventory and backups, then choose a target and test. If you want to rebuild or refresh your website on the new server, we can plan it together through our web design service. We base technical decisions on official documentation and recommend leaving hosting operations to your provider.