AlmaLinux vs Rocky Linux: A Detailed Comparison

This page provides a detailed comparison of AlmaLinux and Rocky Linux, the two major CentOS successors, to help users make an informed choice.

Overall, both are community rebuilds of RHEL with highly similar positioning. It is worth noting that, starting with RHEL 10, AlmaLinux shifted its goal from a "bit-for-bit clone" to being compatible with the RHEL Application Binary Interface (ABI); Rocky Linux, on the other hand, continues to follow the 1:1 binary clone path. The main differences between the two lie in their governance models and build processes, rather than in day-to-day usage experience—the vast majority of RHEL-compatible workloads run fine on both.

Project Background Comparison

Project Origins

Project Info	AlmaLinux	Rocky Linux
Founded	March 2020	December 2020
Founding Organization	CloudLinux Inc.	Gregory Kurtzer, CentOS founder
First Release	March 2021 (AL8.3)	June 2021 (RL8.4)
Project Vision	Forever-free enterprise Linux	The spiritual successor to CentOS

Organizational Structure Comparison

Foundation Governance

AlmaLinux OS Foundation

Organization type: 501(c)(6) non-profit foundation
Founded: March 2021
Governance structure:
  - Board of Directors: community elected + corporate representatives
  - Technical Steering Committee: technical decisions
  - Community managers: day-to-day operations

Funding sources:
  - Platinum sponsors: AWS, Microsoft, Alibaba Cloud, etc.
  - Gold sponsors: VMware, Huawei, etc.
  - Community donations: individuals and small businesses

Independence:
  - Fully independent of any single company
  - Transparent and public decision-making
  - Diversified funding sources

Rocky Enterprise Software Foundation

Organization type: 501(c)(6) non-profit foundation
Founded: January 2021
Governance structure:
  - Board of Directors: led by the founding team
  - Technical team: centralized decision-making
  - Community team: limited participation

Funding sources:
  - Primary source: CIQ (founder's company)
  - Other sponsors: relatively few
  - Community support: limited

Independence:
  - Closely tied to the founder's company
  - Relatively centralized decision-making
  - Higher funding-source concentration

Technical Feature Comparison

Release Cycle and Version Management

Feature	AlmaLinux	Rocky Linux
Release Cadence	Follows RHEL, usually within days of release	Follows RHEL, usually within days to weeks of release
Version Strategy	Synchronized point-release updates	Synchronized point-release updates
RHEL Compatibility Path	ABI compatibility starting from RHEL 10	Sticks to 1:1 binary clone
Build System	AlmaLinux Build System (ALBS)	Peridot
Testing Process	Automated builds + community testing	Automated builds + community testing

System Performance Comparison

Both are based on the same RHEL source code and use the same generation of kernel. On identical hardware, their performance, memory footprint, and image/ISO sizes are essentially the same, and stable, reproducible differences are hard to observe in daily use. Performance should be measured in your target environment; this article does not provide fabricated benchmark figures.

Package Differences

Package Management and Repositories

# AlmaLinux repository configuration
cat /etc/yum.repos.d/almalinux*.repo
# Repositories enabled by default:
# - BaseOS, AppStream, Extras, PowerTools
# - Plus (additional packages)
# - HighAvailability, RealTime (special scenarios)

# Rocky Linux repository configuration  
cat /etc/yum.repos.d/rocky*.repo
# Repositories enabled by default:
# - BaseOS, AppStream, Extras
# - PowerTools
# - Plus (limited additional packages)

Comparison of Exclusive Packages

Both distributions' software repositories come from the same RHEL source code, so their core package sets are essentially identical. The most noticeable difference is in the official container image variants: AlmaLinux additionally provides leaner image variants such as micro. The differences in other day-to-day packages are minimal.

Community Ecosystem Comparison

Community Activity

Metric	AlmaLinux	Rocky Linux
Project Activity	Active	Active
Community Participation	Open contributions, foundation governance	Open contributions, RESF governance
Documentation	Official docs + multilingual/Chinese community docs	Official docs, primarily in English
Chinese Community	Relatively active	Relatively limited

Both are active open-source projects, and community size changes over time. For accurate metrics such as star counts and contributor numbers, please refer to the real-time data on each project's GitHub repository.

Enterprise Adoption

Notable User Cases

AlmaLinux Users:

Cloud providers:
  - AWS: official AMI support
  - Microsoft Azure: official images
  - Google Cloud: first-class support
  - Alibaba Cloud: community image support
  - Tencent Cloud: partnership promotion

Enterprise users:
  - Plex Media Server: official support
  - cPanel: official certification
  - Plesk: compatibility certification
  - JetBrains: development environment support

Rocky Linux Users:

Cloud providers:
  - AWS: community AMI
  - Azure: community images
  - Google Cloud: limited support

Enterprise users:
  - 45Drives: storage solutions
  - NASA: used in some projects
  - CIQ: founder-company support

Technical Support Comparison

Support Channels and Response Times

Support Type	AlmaLinux	Rocky Linux
Community Forum	Active	Active
GitHub Issues	Community response, no formal SLA	Community response, no formal SLA
Chat Channels	Forum / mailing list / chat rooms	Forum / mailing list / chat rooms
Commercial Support	Multiple third-party partners (e.g., TuxCare)	Mainly provided by CIQ

Both are community projects, and their official channels offer best-effort community support with no formal SLA; if you need SLA-backed support, you can choose third-party commercial support.

Documentation and Resources

AlmaLinux documentation strengths:
  - Official docs: complete and detailed, multilingual support
  - Migration guides: detailed tools and steps
  - Best practices: rich set of use cases
  - Chinese resources: a growing Chinese community

Rocky Linux documentation status:
  - Official docs: basic coverage, primarily in English
  - Migration guides: basic tooling support
  - Best practices: limited cases
  - Chinese resources: community-initiated translations

Cloud Platform Support Comparison

Availability on Major Cloud Platforms

Cloud Platform	AlmaLinux	Rocky Linux
Amazon AWS	✅ Official image	✅ Official image
Microsoft Azure	✅ Official image	✅ Official image
Google Cloud	✅ Official image	✅ Official image
Alibaba Cloud	✅ Image available	Depends on region
Tencent Cloud	✅ Image available	Depends on region
Huawei Cloud	✅ Image available	Depends on region

Both have official/community images on major international cloud platforms; image coverage on domestic Chinese cloud providers changes over time, so please refer to the real-time image lists in each cloud marketplace.

Cloud-Native Support

Container Image Comparison

# AlmaLinux container images
docker pull almalinux:9              # standard image (200MB)
docker pull almalinux:9-minimal      # minimal image (100MB)  
docker pull almalinux:9-micro        # micro image (30MB)
docker pull almalinux:9-init         # system init image

# Rocky Linux container images
docker pull rockylinux:9             # standard image (220MB)
docker pull rockylinux:9-minimal     # minimal image (120MB)
# Note: no micro variant

Kubernetes Support

Feature	AlmaLinux	Rocky Linux
Official K8s Guide	✅ Detailed docs	✅ Basic docs
CRI-O Support	✅ Optimized config	✅ Standard config
kubeadm Compatibility	✅ Fully compatible	✅ Fully compatible
Cluster Management Tools	Additional optimizations	Standard tools

Development and Build Comparison

Build Infrastructure

AlmaLinux Build System

Build platform: 
  - Name: "AlmaLinux Build System (ALBS)"
  - Architecture: cloud-native microservices architecture
  - Characteristics: fully open source and auditable
  - Automation: highly automated, CI/CD integration

Source management:
  - Git repositories: fully public
  - Build scripts: open source and inspectable
  - Patch management: transparently handled
  - Community participation: open contributions

Quality assurance:
  - Automated testing: comprehensive coverage
  - Community testing: public testing program
  - Security scanning: integrated security checks

Rocky Linux Build System

Build platform:
  - Name: "Peridot"
  - Architecture: traditional build system
  - Characteristics: partially open source
  - Automation: moderate automation level

Source management:
  - Git repositories: largely public
  - Build scripts: limited openness
  - Patch management: centrally handled
  - Community participation: restricted participation

Quality assurance:
  - Manual testing: primary reliance
  - Community testing: limited extent
  - Security scanning: basic checks

Developer Friendliness

Both are open source, both build systems (ALBS, Peridot) are publicly auditable, and both communities welcome contributions. Their governance models differ: AlmaLinux is governed by the AlmaLinux OS Foundation (an independent foundation), while Rocky Linux is governed by the Rocky Enterprise Software Foundation (RESF), which has a close relationship with CIQ. For the specific contribution experience, please refer to each project's contribution guidelines.

Security Comparison

Security Update Mechanisms

Security Feature	AlmaLinux	Rocky Linux
Update Source	Follows RHEL security updates	Follows RHEL security updates
Release Cadence	Within days of RHEL release	Within days of RHEL release
Security Advisories	Provides ALSA advisories	Provides RLSA advisories
Vulnerability Tracking	Public tracking	Public tracking

Both rely on upstream RHEL security fixes, arrive at similar times, and neither offers a committed response SLA.

Security Tools and Features

# AlmaLinux security tools
dnf install -y openscap-scanner       # security compliance scanning
dnf install -y scap-security-guide    # security guide
dnf install -y aide                   # file integrity checking
dnf install -y rkhunter              # malware detection

# Rocky Linux provides these same tools as well (from the same RHEL repositories)
dnf install -y openscap-scanner scap-security-guide aide rkhunter

Both distributions' security tool sets come from the same upstream repositories and are equally available.

Performance Optimization Comparison

Both use the RHEL kernel and packages and have not made distribution-specific, large-scale performance modifications to the kernel. As a result, their performance-tuning headroom under identical hardware and load is essentially the same. Container and virtualization optimizations depend mainly on the kernel version and configuration rather than on distribution differences. If you need performance data, measure it in your target environment.

Cost-Benefit Analysis

Total Cost of Ownership (TCO)

Cost Factor	AlmaLinux	Rocky Linux	Notes
License Cost	Free	Free	Same
Training Cost	Lower	Lower	Both are RHEL-compatible; skills are reusable
Migration Cost	Very low	Very low	Both provide migration tools
Operations Cost	Comparable	Comparable	Same source and generation, same operational practices
Support Channels	Multiple third parties	Mainly CIQ	Different sources of commercial support

Long-Term Sustainability

AlmaLinux sustainability:
  Governance: operated by the independent AlmaLinux OS Foundation
  Funding: multiple corporate sponsors + community donations, fairly diversified sources
  Ecosystem: images from multiple cloud vendors, active community

Rocky Linux sustainability:
  Governance: operated by the Rocky Enterprise Software Foundation (RESF)
  Funding: closely tied to the founder's company CIQ
  Ecosystem: founded by the CentOS founder, active community

Note: Both are actively maintained projects; the main differences lie in governance and funding structure, not availability.

Recommendations

Recommended Use Cases

When to Choose AlmaLinux

Strongly recommended:
  - Cloud deployments (especially AWS, Azure, GCP)
  - Containerized applications
  - Environments needing fast security updates
  - Deployments in the China region
  - Enterprises needing commercial support
  - Development and testing environments

Suitable scenarios:
  - Launching new projects
  - Large-scale deployments
  - Multi-cloud environments
  - Microservices architecture
  - Open source projects

When to Choose Rocky Linux

Good fit when:
  - Traditional data center environments
  - Emotional preference for CentOS
  - Relatively simple environments
  - Scenarios that don't need fast updates

Things to consider:
  - Sticks to the 1:1 binary clone path (different orientation from AlmaLinux's ABI compatibility path)
  - Governance and funding are more concentrated in RESF/CIQ
  - Commercial support is mainly provided by CIQ

Migration Path Recommendations

Recommendations for Migrating from CentOS

graph TD
    A[CentOS Users] --> B{Assess Needs}
    B -->|Cloud / fast updates| C[Choose AlmaLinux]
    B -->|Traditional env / stability| D[Either works]
    B -->|Chinese users| C
    B -->|Commercial support needs| C
    C --> E[AlmaLinux migration tools]
    D --> F[Compare and test]
    F --> G[Final decision]

---

Summary: AlmaLinux and Rocky Linux are both RHEL-compatible, forever-free enterprise distributions with a highly similar day-to-day experience, and the vast majority of RHEL workloads run fine on both. The main differences lie in their governance model and compatibility path: AlmaLinux is governed by an independent foundation and has shifted to ABI compatibility since RHEL 10; Rocky Linux is governed by RESF and sticks to the 1:1 binary clone. We recommend choosing based on your team's preferences regarding governance model, ecosystem, and support channels, combined with hands-on testing in your target environment.

Next step: See the AlmaLinux Migration Guide to start planning your migration.