How to Replace CentOS 7: Practical Comparison of Rocky, Alma, RHEL, openEuler, Kylin and Ubuntu
After CentOS 7 reached end‑of‑life, this guide evaluates six popular alternatives—Rocky Linux, AlmaLinux, Red Hat Enterprise Linux, openEuler, Kylin V10 and Ubuntu—by outlining their origins, RHEL compatibility, open‑source status, cloud‑native support, and ideal migration scenarios.
Background
CentOS 7 reached end‑of‑life in June 2024, so enterprises must migrate to a supported distribution to maintain security updates and compliance.
Supported alternatives
Rocky Linux
Community‑driven, initiated by the original CentOS maintainers.
Binary compatible with RHEL 8/9; migration requires only a repository switch.
Uses yum / dnf and rpm package formats.
Provides cloud‑provider mirrors and long‑term maintenance.
AlmaLinux
Backed by the CloudLinux Foundation; 100 % RHEL binary compatibility.
Includes FIPS‑140‑2 and CIS hardening certifications.
Same package ecosystem as Rocky (yum/dnf, rpm).
Red Hat Enterprise Linux (RHEL)
Commercial distribution with subscription‑based support and SLA.
Offers extended update support (EUS) and certified hardware/software stacks.
Uses dnf and rpm; provides access to Red Hat Satellite, Insights, and certified container images.
openEuler
Open‑source OS led by Huawei, targeting the Chinese “trust‑worthy computing” (信创) ecosystem.
Supports ARM‑based Kunpeng, Feiteng, and LoongArch CPUs.
Partial RHEL compatibility: most command‑line tools (yum/dnf) work, but some libraries differ.
Provides a yum‑compatible repository and extensive container/K8s runtime support.
Kylin V10
Government‑focused distribution, kernel 4.19 LTS with back‑ported security fixes.
Uses rpm but includes proprietary modules for specific国产 applications.
Desktop‑oriented UI (GNOME/Kylin) while also supporting server roles.
Ubuntu LTS
Debian‑based, uses apt and deb packages.
Long‑term support releases (e.g., 22.04 LTS) receive updates until 2032.
Native integration with Kubernetes, Docker, and AI/ML toolchains.
Not binary compatible with RHEL; migration requires application recompilation or containerization.
Key comparison
RHEL compatibility: Rocky, Alma, RHEL – full; openEuler, Kylin – partial; Ubuntu – none.
Open‑source licensing: Rocky, Alma, openEuler, Ubuntu – fully open; RHEL – source‑available; Kylin – mixed.
Cloud‑native readiness: All except Kylin have strong container/K8s support; Ubuntu provides the most extensive ecosystem.
信创 (domestic‑innovation) suitability: openEuler and Kylin are designed for it; other distributions are not.
Typical migration recommendations
Traditional web or legacy applications → Rocky Linux or AlmaLinux (drop‑in replacement).
Environments with strict security audits → AlmaLinux or RHEL (certified hardening).
Government or 信创 projects → openEuler or Kylin V10 (CPU and certification support).
Container‑first or Kubernetes workloads → Ubuntu LTS or Rocky Linux.
Mission‑critical transaction systems → RHEL with commercial support.
Technical caveats
Kylin’s kernel (4.19) and package management differ from standard RHEL; scripts that assume yum / dnf may need adjustment.
openEuler’s partial RHEL compatibility may require rebuilding native RHEL libraries.
Ubuntu migration typically involves containerizing applications or rebuilding from source due to different libc and package formats.
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