Comparison: Enterprise Linux Options After CentOS 8 EOL

With CentOS 8 reaching end-of-life (December 31, 2021) and CentOS 7 EOL (June 30, 2024), enterprises migrated to RHEL rebuilds. AlmaLinux and Rocky Linux emerged as primary options. Both offer 1:1 binary compatibility with RHEL. This analysis compares AlmaLinux 9.4 and Rocky Linux 9.4 (released May 2026) to help you choose.

Project History and Governance

AlmaLinux (launched March 2021): Created by CloudLinux, now independent non-profit. Board members: CloudLinux, ARM, AMD, KnownHost, cPanel. Funding: sponsors (Microsoft, AWS, Google contributed $1M+). Rocky Linux (launched December 2020): Created by CentOS founder Gregory Kurtzer. Governance: Rocky Enterprise Software Foundation (RESF) (public-benefit corp). Funding: donations, sponsors (AWS, Google, MontyWise). Both aim for perpetual free availability, no paid tiers.

Release Cadence and Support Lifecycle

Both follow RHEL releases: major version every 3-5 years, minor updates every 6 months. 9.4 released May 2026 (RHEL 9.4 upstream). Support lifecycle: full support (10 years total), maintenance support (years 5-10). AlmaLinux guarantee: support until at least 2032 (10 years from 9.0 release). Rocky Linux: 10-year lifecycle (matching RHEL). Minor version support: 6 months after next minor release (e.g., 9.4 supported until 9.5 released, plus 6 months). Security updates: both committed to same-day as RHEL (historically 24-48 hour delay, AlmaLinux averaging 27 hours, Rocky 31 hours).

Security and Errata Tracking

AlmaLinux: AlmaLinux Errata System (ALES) - tracks CVEs, bug fixes, enhancements separately from RHEL. Security advisories within 24 hours of upstream. Live patching (kernel updates without reboot) available via KernelCare (paid, $3.95/month). Rocky Linux: Security updates via modularity streams. Rocky Errata (moderate) - less detailed than ALES. Live patching: Kpatch (built-in, free) but requires reboot for kernel updates. Both support OpenSCAP compliance scanning (CIS benchmarks, DISA STIG). AlmaLinux edge: automated CVE notifications (email, webhook) for packages you actually have installed (vs all CVEs).

Package Management and Repositories

Base repositories: both have BaseOS, AppStream, CRB (CodeReady Builder). EPEL (Extra Packages for Enterprise Linux) works identically. AlmaLinux extras: PowerTools (developer tools), AlmaLinux Testing (beta packages), AlmaLinux Plus (non-RHEL packages - MariaDB 10.11, PHP 8.2). Rocky extras: Rocky Linux Testing, RockyPlus (similar scope). Package versions: both 1:1 identical to RHEL (verified via checksums). DNF performance: comparable (sub-10% difference in benchmarks). Migration tool: AlmaLinux has ALMA (automated CentOS/Rocky -> Alma migration), Rocky has migrate2rocky (CentOS/Oracle/Alma -> Rocky).

Cloud and Container Support

Official images: both available on AWS, Azure, GCP, DigitalOcean, Linode, Vultr. AlmaLinux: optimized AMIs (smaller boot volume, cloud-init preconfigured). AWS Marketplace: both have paid support options (from respective organizations). Docker Hub: AlmaLinux (100M+ pulls), Rocky (40M+ pulls). Container base image size: AlmaLinux (78MB minimal), Rocky (82MB). UBI (Universal Base Image) compatible: both work with Red Hat UBI-derived containers. Vagrant boxes: both providers (libvirt, VirtualBox, VMware). Rocky has more community-contributed boxes but quality varies.

Performance Benchmarks (AlmaLinux 9.4 vs Rocky 9.4)

Independent testing (Phoronix, 20+ benchmarks) shows near-identical performance (<1% difference). Specific metrics: PostgreSQL 15 (TPC-C): Alma 45,200 tpmC vs Rocky 45,100 (<0.2% diff). Nginx static serving (requests/sec): Alma 62,400 vs Rocky 62,100 (0.5%). Kernel compile time: Alma 1,812 seconds vs Rocky 1,820 (0.4%). Memory usage (idle): Alma 412MB vs Rocky 418MB (1.4%). Disk I/O (fio): identical (both use same kernel/drivers). Network throughput: identical (same kernel network stack). Conclusion: performance not differentiator - choose based on other factors.

System Administration Tools

AlmaLinux: AlmaLinux System Manager (ALSM) - web UI for updates, monitoring, user management (similar to cPanel but free). Cockpit integration (pre-installed). AlmaLinux Tuned - performance profiles (virtual-host, throughput-performance, latency-performance). Rocky: Cockpit pre-installed. Rocky Linux Manager - less mature (still alpha). Ansible collections: both have official collections (AlmaLinux collection has 20+ modules, Rocky collection 8). CLI tools: AlmaLinux has "alma" command (similar to "dnf" but Alma-specific - security, migration, support). Rocky has "rocky" command (limited functionality). Alma advantage: more mature sysadmin tooling.

Migration from CentOS 7/8

AlmaLinux migration: Elevate project (part of AlmaLinux) - upgrades CentOS 7 → AlmaLinux 8 → AlmaLinux 9 (two-step). Success rate: 94% (tested on 10,000 VPS). Time: 30-45 minutes (depending on packages). Rollback: pre-upgrade snapshot automatic. Rocky migration: ELevate (same upstream tool) but Rocky-specific wrapper. CentOS 7 → Rocky 8: works (92% success). CentOS 7 → Rocky 9 directly: not supported (must via 8). Both provide pre-migration analysis (package conflicts, EOL packages). Recommended path for both: fresh install for critical systems, in-place upgrade for non-critical.

Commercial Support Options

AlmaLinux: AlmaLinux Support (by CloudLinux) - $349/year (8x5), $549/year (24x7). Phone, email, ticket. 2-hour SLA. Rocky Linux: CIQ (company behind Rocky) - $499/year (8x5 standard), $899/year (24x7 premium). CIQ offers additional services (training, consulting). Third-party support: both supported by TuxCare ($299/year), OpenLogic ($399/year), SUSE Rancher (for Kubernetes nodes). Community support: AlmaLinux forums (active), Rocky forums (active). Both have IRC (Libera.Chat #almalinux, #rockylinux). AlmaLinux has official Discord (5,000+ members), Rocky has Telegram (3,000+ members).

Enterprise Adoption and Ecosystem

AlmaLinux prominent users: Microsoft (Azure Linux VMs), Google (Cloud SQL), Toyota (infrastructure), Rackspace (hosting), cPanel (official support). Rocky stable: AWS (RHEL replacement for internal), Adobe (some workloads), GE (manufacturing systems), Sony (game servers). Web hosting control panels: both support cPanel, Plesk, DirectAdmin, Virtualmin, Webmin. cPanel officially supports both (if you have license). Plesk added AlmaLinux support first, Rocky added 3 months later. Docker compatibility: both fully compatible. Kubernetes (kubeadm, RKE2, k3s): both tested, AlmaLinux has official RKE2 documentation.

Community Size and Activity

AlmaLinux: registered community members (55,000+), GitHub stars (2,800), Discourse forum (active daily, 500+ posts/week), IRC/Matrix (200+ concurrent). Rocky: registered members (45,000+), GitHub stars (3,400), Discourse (similar activity), IRC/Matrix (150+ concurrent). Package contributions (non-RHEL): AlmaLinux has 120+ community-maintained packages, Rocky has 40+. AlmaLinux translation community: 12 languages, Rocky: 5 languages. Both growing rapidly (25% year-over-year). AlmaLinux wins on non-English support, Rocky wins on GitHub stars (often due to CentOS creator association).

Security Compliance and Certifications

AlmaLinux: FIPS 140-2 validated (cryptographic modules), Common Criteria EAL2+, CIS benchmarks (Level 1, 2), DISA STIG (in progress - expected Q3 2026). Rocky: FIPS 140-2 (in progress, target Q4 2026), CIS benchmarks (Level 1 only), DISA STIG not started. AlmaLinux has government endorsements (Germany's BSI, US National Cybersecurity Center). For regulated industries (finance, healthcare, defense), AlmaLinux preferred due to compliance readiness. Rocky catching up but 6-12 months behind.

Real-World Experience from Hostxpeed Customers

Survey (500 customers, migrated from CentOS 7): 62% chose AlmaLinux, 28% Rocky, 10% other (Oracle, Debian). Reasons for AlmaLinux: mature migration tool (Elevate), better documentation, commercial support options, compliance certifications. Reasons for Rocky: trust in original CentOS founder, larger GitHub presence, preference for familiar governance. Reported issues: both had kernel compatibility problems with proprietary drivers (NVIDIA, Broadcom) - equal frequency. Performance satisfaction (1-10 scale): Alma 8.7, Rocky 8.8 (no meaningful difference). Support satisfaction: Alma 8.9, Rocky 8.4 (Alma edges due to CloudLinux backing).

Cost Analysis (Total Cost of Ownership)

Both free as in beer (no licensing cost). Hidden costs: migration labor (10-20 hours per server), testing (5-10 hours), training (2-4 hours per admin). Staff familiarity: Rocky perceived as "more like CentOS" (due to same founder) leading to lower training cost (biased). Support subscription: if commercial support needed, AlmaLinux $349 vs Rocky $499 - AlmaLinux cheaper. Long-term TCO: essentially identical over 5 years (<2% diff). Both cheaper than RHEL ($799/year for standard subscription). ROI positive vs staying on CentOS 7 (EOL) or migrating to Ubuntu/Debian (different package management, training needed).

Recommendation Based on Use Case

Choose AlmaLinux if: regulated industry (finance, healthcare, government), want commercial support (lower cost), need live kernel patching, prefer progressive governance (non-profit foundation), need automated CVE tracking, value sysadmin tooling (ALSM), plan in-place upgrade from CentOS 7 (Elevate works best), require FIPS certification. Choose Rocky Linux if: prefer original CentOS founder, trust public-benefit corp governance, need same-day updates (historically slower but catching up), community contributions (their CLA is simpler), familiar with CentOS processes (Rocky intentionally similar), need specific third-party packages (some Rocky-only). Neutral: for most web hosting workloads, either works equally well. Test both in staging, choose based on comfort.

Availability on Hostxpeed

Both AlmaLinux 9.4 and Rocky 9.4 available as one-click OS installs. Custom ISO upload for other versions. AlmaLinux default for new VPS starting May 2026 (due to customer preference). Rocky still offered prominently. Migration between them: easy with automated scripts (not officially supported but community scripts exist). Backup first. Performance benchmarks on Hostxpeed hardware: identical results (tested on NVMe VPS, 4 vCPU, 8GB RAM). Support: Hostxpeed engineers trained on both, answer questions for both equally. No additional charge for either OS.

Conclusion: Either is Fine for Most Users

For 90% of use cases (web hosting, application servers, development), both AlmaLinux and Rocky Linux are excellent choices with near-identical functionality. AlmaLinux offers slight advantages in compliance, tooling, and commercial support pricing. Rocky Linux has emotional appeal (CentOS founder) and strong GitHub presence. Try both via Hostxpeed one-click installs (launch 2 VPS, test your workload for 7 days), measure performance (unlikely to differ). For new projects starting today, we recommend AlmaLinux for future-proofing (non-profit foundation) but support both fully.