Introduction to CentOS and AlmaLinux
CentOS Linux is discontinued; CentOS Stream is a separate, continuing release model. Plan new deployments on a supported release rather than treating old CentOS Linux installations as a current option.
For many years, CentOS was one of the most widely used Linux distributions in hosting environments, enterprise infrastructure, cloud platforms, and web servers. Organizations appreciated its stability, long-term support cycle, and compatibility with Red Hat Enterprise Linux (RHEL).
The Linux landscape changed significantly when Red Hat announced that CentOS would transition to CentOS Stream. This decision led many users and organizations to search for alternatives that could continue providing a traditional RHEL-compatible experience.
One of the most successful outcomes of this transition was AlmaLinux, a community-driven operating system created to serve as a stable and free replacement for traditional CentOS.
Understanding the similarities and differences between CentOS, CentOS Stream, and AlmaLinux can help organizations choose the operating system that best fits their infrastructure requirements.
Why CentOS Changed
On December 8, 2020, Red Hat announced a major change to the CentOS project.
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Traditional CentOS operated as a downstream rebuild of Red Hat Enterprise Linux. Updates were thoroughly tested through Fedora and RHEL before reaching CentOS users.
Following the change, CentOS became CentOS Stream.
Instead of receiving software after it had been finalized for RHEL, CentOS Stream became part of the development process that feeds future RHEL releases.
CentOS Stream tracks development ahead of the next RHEL minor release; it should not be confused with Fedora or described as simply an untested beta.
As a result, many organizations began evaluating alternatives that maintained the traditional CentOS approach.
Several projects emerged, including:
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- AlmaLinux
- Rocky Linux
- Oracle Linux
- Springdale Linux
Among these options, AlmaLinux quickly became one of the most widely adopted solutions.
Understanding CentOS Stream
CentOS Stream serves as a preview platform for future Red Hat Enterprise Linux releases.
Software packages generally appear in CentOS Stream before they are included in RHEL.
This development model provides several benefits:
- Earlier access to upcoming features
- Better visibility into future RHEL development
- Opportunities to test software before official enterprise releases
However, some organizations view this model as introducing additional risk because software reaches CentOS Stream before receiving the full validation process associated with enterprise production releases.
Security updates remain an exception. Critical security fixes are typically delivered to Red Hat Enterprise Linux before becoming available in CentOS Stream.
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What Was Traditional CentOS?
Traditional CentOS functioned as a downstream rebuild of Red Hat Enterprise Linux.
The software development path typically followed this sequence:
Fedora → Red Hat Enterprise Linux → CentOS
Software was first introduced in Fedora.
After testing and stabilization, packages were incorporated into Red Hat Enterprise Linux.
Once validated in enterprise environments, those same packages became available in CentOS.
This process gave CentOS a reputation for:
- Stability
- Reliability
- Predictable updates
- Enterprise readiness
- Long support lifecycles
These characteristics made CentOS extremely popular among hosting providers, cloud platforms, developers, and system administrators.
What Is AlmaLinux?
AlmaLinux is a free and open-source Linux distribution created as a replacement for traditional CentOS.
The project was launched by the CloudLinux team shortly after the CentOS announcement.
AlmaLinux is governed by the AlmaLinux OS Foundation, which oversees the project’s long-term development and community direction.
AlmaLinux targets application binary interface (ABI) compatibility with RHEL rather than an exact one-to-one rebuild. Validate vendor support and application requirements instead of assuming every package or kernel is identical.
Its primary goals include:
- Long-term stability
- Enterprise reliability
- Community governance
- Free availability
- RHEL compatibility
For many former CentOS users, AlmaLinux provides a familiar migration path.
Similarities Between CentOS and AlmaLinux
Although they are different projects, AlmaLinux and traditional CentOS share many characteristics.
RHEL Compatibility
Both operating systems are based on Red Hat Enterprise Linux.
This allows users to run software and applications designed for the RHEL ecosystem.
Enterprise Focus
Both distributions target enterprise workloads such as:
- Web hosting
- Virtualization
- Cloud infrastructure
- Database servers
- Application hosting
RPM Package Format
Both use RPM packages and rely on modern package management tools such as DNF.
Examples include:
dnf install package-name
dnf update
dnf remove package-name
Community Involvement
Both projects rely heavily on community participation and feedback.
Free Licensing
Neither operating system requires licensing fees for standard use.
Organizations can deploy them without per-server subscription costs.
Differences Between CentOS and AlmaLinux
Despite their similarities, several important distinctions exist.
Project Direction
Traditional CentOS was closely associated with Red Hat.
AlmaLinux is managed by the AlmaLinux Foundation and supported by a broader community structure.
Development Model
CentOS Stream functions as a preview platform for future RHEL updates.
AlmaLinux focuses on maintaining stable RHEL compatibility after releases become available.
Release Philosophy
CentOS Stream prioritizes visibility into future development.
AlmaLinux prioritizes predictable production stability.
Migration Focus
AlmaLinux specifically targets organizations seeking a direct replacement for traditional CentOS environments.
Advantages of CentOS Stream
CentOS Stream offers several benefits.
Access to Newer Software
Packages become available earlier than on many enterprise-focused distributions.
Organizations can test upcoming technologies before official RHEL releases.
Contribution Opportunities
Developers and vendors can provide feedback that influences future RHEL versions.
Improved Visibility
System administrators gain insight into the direction of the RHEL ecosystem.
Free Access
CentOS Stream remains freely available.
Disadvantages of CentOS Stream
Reduced Predictability
Because updates arrive earlier in the development cycle, organizations may encounter unexpected changes.
Shorter Lifecycle
CentOS Stream generally provides a shorter support window than traditional CentOS releases.
Less Conservative Update Strategy
Organizations prioritizing maximum stability may prefer a downstream distribution.
Advantages of AlmaLinux
Familiar Environment
Former CentOS administrators can migrate with minimal changes.
System management procedures remain largely unchanged.
Enterprise Stability
AlmaLinux focuses on providing a stable operating environment suitable for production workloads.
Easy Migration
Migration tools are available to help convert existing CentOS systems.
Long-Term Support
Each major release receives long-term maintenance and security updates.
Cost Efficiency
Like CentOS, AlmaLinux remains free for personal and commercial use.
Broad Hosting Adoption
Many hosting providers and infrastructure vendors now support AlmaLinux as a primary operating system.
Disadvantages of AlmaLinux
Like any enterprise-focused Linux distribution, AlmaLinux has certain limitations.
Older Software Versions
The emphasis on stability means newer software versions may take longer to become available.
Conservative Development
Users seeking cutting-edge packages may prefer distributions with faster release cycles.
Traditional Desktop Experience
The graphical environment focuses on reliability rather than modern desktop aesthetics.
Software Management in AlmaLinux
AlmaLinux uses DNF as its primary package manager.
Installing software:
dnf install nginx
Updating installed packages:
dnf update
Searching for packages:
dnf search php
Removing packages:
dnf remove nginx
System administrators familiar with CentOS will find package management nearly identical.
Migration from CentOS to AlmaLinux
The migration path depends on the exact source and target major versions, hardware, repositories and control panel. A same-major conversion is different from a major-version upgrade; neither is guaranteed to complete without downtime.
The migration process typically involves:
- Updating the system
- Installing AlmaLinux migration packages
- Converting repositories
- Synchronizing packages
- Rebooting the server
Many applications continue operating without modification because of AlmaLinux’s strong compatibility with RHEL-based environments.
Before performing any migration, administrators should create complete system backups and test the process in a staging environment.
Which Distribution Should You Choose?
The best choice depends on your goals.
CentOS Stream may be suitable if:
- You want early access to future RHEL features
- You participate in development and testing
- You prefer seeing changes before they reach enterprise releases
AlmaLinux may be a better fit if:
- Stability is the highest priority
- You need a traditional CentOS replacement
- You manage production hosting infrastructure
- You require long-term enterprise compatibility
- You want predictable updates and support
Choosing the Right RHEL-Compatible Platform
The transition from traditional CentOS to CentOS Stream changed the Linux ecosystem significantly. While CentOS Stream continues to serve an important role in Red Hat’s development process, many organizations prefer a more traditional enterprise operating system for production workloads.
AlmaLinux has emerged as one of the most widely adopted alternatives by providing long-term stability, RHEL compatibility, community governance, and a familiar administration experience. For organizations looking to replace traditional CentOS deployments without significantly changing their infrastructure, AlmaLinux offers a practical and reliable path forward.
