Choosing a Server Distro: Ubuntu vs. Debian vs. CentOS Stream vs. Rocky vs. AlmaLinux

When you spin up a VPS or bare-metal box, the image list often shows a long menu of distributions, and it's easy to freeze up. The good news: they fall into two families. Once you understand the families and their update cadence, the choice gets simple.

Two families

Most server distributions belong to one of two lineages:

• The Debian family — Debian itself plus Ubuntu, which is built on it. They use apt / dpkg for package management, ship reasonably fresh software, and have an enormous pool of community docs.
• The RHEL family — modeled on Red Hat Enterprise Linux. They use dnf / yum (over rpm), favor long, stable support cycles, and are the platforms many enterprise vendors officially target. CentOS Stream, Rocky Linux, and AlmaLinux all live here.

Picking a distro really comes down to a trade-off: newer-and-friendly versus stable-and-enterprise-compatible.

A closer look

• Ubuntu — Maintained by Canonical and the friendliest option for newcomers. LTS (Long-Term Support) releases land every two years with five years of free security updates. It has the richest ecosystem and the most tutorials, so almost any problem is a search away.
• Debian — Community-run and famous for stability. Its release pace is conservative, so packages are older but battle-tested. It's lean and ideal for a set-it-and-forget-it server.
• CentOS Stream — A Red Hat project positioned as the rolling upstream preview of RHEL: changes bound for the next RHEL minor release appear here first. It's slightly ahead of RHEL, but it is no longer the free, downstream "stable clone" it used to be, so don't treat it as a drop-in replacement for CentOS Linux.
• Rocky Linux — One of the community successors that emerged after CentOS Linux was discontinued. It's binary-compatible with RHEL and offers roughly 10 years of support, making it a smooth landing spot for former CentOS users.
• AlmaLinux — Another RHEL-compatible successor, foundation-backed, with the same 10-year support horizon. It fills nearly the same role as Rocky, so pick whichever you trust more.

At a glance

| Distro | Package manager | Update cadence | Best for | |---|---|---|---| | Ubuntu LTS | apt / dpkg | New LTS every 2 years, 5-year support | Beginners, websites, general-purpose default | | Debian | apt / dpkg | Conservative, 2 years per stable release | Rock-solid, low-maintenance servers | | CentOS Stream | dnf / yum | Rolling, ahead of RHEL | Dev/test, tracking the RHEL upstream | | Rocky Linux | dnf / yum | Follows RHEL, 10 years | RHEL compatibility with long support | | AlmaLinux | dnf / yum | Follows RHEL, 10 years | Same as above; pick one or the other |

What changed with CentOS (important)

• CentOS Linux 7 reached end of life on June 30, 2024. It no longer receives security updates, so don't deploy it on new machines.
• CentOS Linux 8 hit EOL even earlier, at the end of 2021.
• Red Hat repositioned CentOS from a free, downstream clone of RHEL into the rolling, upstream CentOS Stream. That shift is exactly why Rocky Linux and AlmaLinux were created — to take over the stable-clone role CentOS Linux once played.

Summary

• Not sure? Go with Ubuntu LTS. The best docs and the fewest surprises cover the vast majority of websites and general workloads.
• Want maximum stability with minimal fuss? Choose Debian.
• Software specifically needs RHEL/CentOS, or your team lives in that ecosystem? Pick Rocky Linux or AlmaLinux — either works, both offer 10 years of support.
• Stop installing CentOS 7/8 (both EOL). CentOS Stream suits dev and testing more than stable production, unless you knowingly need its upstream features.