When Linux users get into arguments about init systems, the conversation usually circles back to systemd.systemd came out of a time when the Linux ecosystem was experimenting a lot, as distros searched for a better replacement for the aging SysV init system that had powered most Unix-like systems since the 1980s.SysV init worked, but it had clear limitations (don't hate me for this) because of its sequential order and primitive dependency management, because of which many projects attempted to modernize the boot process and service management model.
Some focused on speed, others emphasized correctness, minimalism, or better dependency handling.A few of these projects gained some real traction, but none of them became the default across the entire Linux ecosystem.Ultimately, systemd emerged as the dominant solution, but along the way, several serious contenders came close.
Here are 4 Linux init systems that nearly replaced systemd, and why they eventually lost momentum.Upstart An event-driven init system developed by Canonical If you have used Ubuntu between 2006 and 2015, you used Upstart.Developed by Canonical, Upstart replaced the old SysV model with an event-driven architecture.
Instead of running startup scripts in one fixed order, services would react to things happening in the system.This included events like a filesystem becoming available, a device being detected, or the network being ready.This allowed services to start asynchronously, which improved boot performance and made the startup process more dynamic.
At the time, this was a huge step up from SysV init.Ubuntu adopted Upstart early, and because Ubuntu was one of the largest Linux distros, a lot of people just assumed Upstart would become the new standard for Linux.For several years, it looked like the likely successor, but it didn't and the project died.
Related Why Ubuntu is a frustrating choice for desktops but great for laptops Ubuntu isn't a bad distro—you're just using it on the wrong machine.Posts 11 By Dibakar Ghosh Why it failed Upstart modernized the boot process, but it remained narrowly focused on init and service management.Meanwhile, systemd expanded rapidly beyond those boundaries (which is why some people hate it).
It integrated logging, device management, timers, service supervision, user sessions, and other components that had previously been handled by separate tools.The big turning point came in 2014 when Debian chose systemd as its default init system instead of Upstart and because so many distros either depend on Debian or share its packages, that one decision shifted the momentum of the whole ecosystem.Ubuntu eventually switched over as well, replacing Upstart with systemd in Ubuntu 15.04.
Upstart was technically a capable piece of software but once the major distros standardized on something else, it had little chance of staying relevant.OpenRC A conservative improvement of the traditional SysV model OpenRCOpenRC took a much more conservative path.Instead of redesigning the entire boot process from scratch, OpenRC just improved the traditional SysV model.
Technically, it is not even an init system itself.It is a service manager that runs on top of a separate init system, usually BusyBox init or sysvinit.It kept the familiar structure of shell script services but added proper dependency management, parallel startup, and better service supervision.
Gentoo adopted OpenRC as its default and Alpine Linux still uses it today.It has gained a loyal following among users who preferred a simple design that remained compatible with traditional Unix practices.I personally like it, but I have a thing for Fedora, so I stick to systemd.
Why didn't it become big OpenRC deliberately avoids expanding into other areas of system management.That design philosophy appeals to minimalists, but it limits the system's influence.While systemd was building an integrated platform for almost everything, OpenRC stayed focused on boot and service scripts.
For distros that wanted a unified framework, systemd offered a much more complete solution.OpenRC has not completely disappeared, but it has mostly stayed within its smaller ecosystems.runit An extremely small and predictable service supervision system runit takes minimalism even further than OpenRC.
The system is built around a simple, three-stage boot process.Services are managed through lightweight supervision directories, and each service runs under its own dedicated monitor process that makes sure it stays active.The whole design is tiny and predictable.
There is very little hidden behavior and almost no abstraction.Void Linux uses runit as its default init system, which shows that a modern Linux distro can function perfectly well without systemd.Why didn't it become big The same minimalism that makes runit elegant also limits its scope.
runit focuses almost entirely on service supervision and does not try to do anything else.To build a complete system, you need to assemble several additional tools around it.That kind of modular design fits really well for specialized environments, but it makes large-scale adoption less likely.
Related What Is Void Linux, and What Makes It Unique? Stop shouting into the void and put it on your computer.Posts By Sam Medley s6 A highly structured approach to service supervision s6 approaches service supervision as a formal system rather than a collection of scripts.It provides a structured framework for process supervision, dependency management, and reliable service state transitions.
The system puts a lot of emphasis on correctness, deterministic behavior, and carefully defined failure handling.Unlike many init systems, s6 focuses heavily on making sure processes are supervised correctly and that service lifecycles stay predictable.From a purely technical standpoint, many developers consider it one of the cleanest designs in the whole init ecosystem, but clean does not always win.
Why it is still niche The downside of all that rigor is complexity.That is fine for geeks and nerds like us, but systemd's relatively simple declarative unit files are much easier for most users to work with.For typical distro maintainers and system administrators, s6 introduces a steeper learning curve.
As a result, s6 tends to show up in specialized environments, embedded systems, or container infrastructure, rather than in mainstream Linux distros.Why systemd won Ecosystem alignment played a major role systemd succeeded for several reasons, but the most important factor was ecosystem alignment (I will leave it to you to decide whether Red Hat's considerable resources were simply too large for anyone else to compete against).By the early 2010s, Linux distributions were dealing with a lot of fragmentation in how they managed services.
Boot scripts, logging systems, device managers, and session managers were often loosely connected components developed for completely different projects.systemd brought many of these responsibilities together under a single framework.This lets distros standardize one service manager, one logging interface, one dependency model, and one configuration format.
Once Fedora adopted systemd and Debian followed in 2014, the majority of the Linux ecosystem quickly lined up behind it.Package maintainers started shipping systemd unit files by default, and most documentation just assumed you would be using systemd commands.That was a big factor.
It's easier to remember a few systemctl options than different commands for each distro.Also, third-party tools and orchestration frameworks began integrating directly with it.At that point, the network effects became really difficult for any alternative to overcome.
Related 4 systemd tools that make everyday Linux troubleshooting much easier Control services, read logs, profile boot time, and inspect crashes with these four built-in systemd tools.Posts 1 By John Wachira Why systemd remains controversial The debate around scope and Unix philosophy Despite being adopted everywhere, systemd has been one of the most controversial projects in modern Linux history.The criticism usually comes back to its scope.
The traditional Unix philosophy encourages small tools that each do one thing well.systemd instead integrates a lot of different responsibilities into one unified framework, including logging, networking components, device management, and service supervision.People who support it argue that this kind of integration improves reliability and makes system administration simpler, but critics say it concentrates too much functionality into a single project and just makes the whole system more complex.
One easy way to understand why systemd creates so much debate is to simply look at how big it is.Subscribe to the newsletter for deeper Linux init insights Want nuanced perspectives beyond the basics? Subscribing to the newsletter provides curated coverage and expert analysis of systemd, OpenRC, runit, s6, and the broader Linux init debate — plus context on related infrastructure choices.Get Updates By subscribing, you agree to receive newsletter and marketing emails, and accept our Terms of Use and Privacy Policy.
You can unsubscribe anytime.Try running commands like: find /usr/lib/systemd/ -type f | wc -l tree /usr/lib/systemd/ On most modern distros, the result is quite large.The directory contains hundreds of unit files, helpers, generators, and supporting components that make up the broader systemd ecosystem.
Supporters see it as a unified platform that simplifies system management.Critics see a rapidly expanding core that replaces many traditional Unix utilities.Alternatives still exist in smaller ecosystems Even today, not every Linux distro uses systemd.
Some projects intentionally choose different init systems that align better with their design philosophy.Alpine Linux relies on OpenRC, Void Linux uses runit, and projects such as Devuan continue to maintain environments built around non-systemd init systems.Despite this diversity, the broader Linux ecosystem has largely standardized on systemd.
Most major distros ship it by default, and much of the surrounding tooling and documentation assumes it is present.Whether people appreciate it or criticize it, systemd has become one of the most influential pieces of infrastructure in modern Linux and its scope continues to expand.Framework Laptop 13 Price Starting at $799 Brand Framework Build your laptop yourself and get exactly what you want—and replace parts as they become outdated.
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