Examining The Future of Init
18 Oct '05 - 18:49 by benrIts time to talk about the future of init. In the last year 3 new methods, on 3 diffrent UNIX platforms have arisen. We're talking about:
Three designs, one common goal. Init and the RC system are old piles of crap that should have died a horrible death 20 years ago, lets face facts. I personally think that these projects fall more in the "what took so long?" camp than the "revolutionary new direction in UNIX systems" category. You could easily argue it either way.
Over the next day or two I'm going to give you an overview of the three systems. We'll look at how they work, where you can get them, what they can do, and try to get a glimpes into the strengths and weaknesses of each. Which system you use is going to be primarily based on which platform your running, so we're going to avoid the "f00 sucks, use bar" arguments.
The most interesting thing about these three systems is that all three of them are open source. InitNG is GPL, launchd is APSL, and SMF is CDDL. So perhaps is more accurate to say that the system which you use depends not so much on your platforms as it does your license. To some degree its theoretically possible to make all three of these systems work on all three platforms.
But before we get started, lets look at what all three of these systems share in common:
- Paralell Startup: Reduce your startup time by starting more than a single daemon/subsystem at a time.
- Elimination of RC scripts: Wave goodbye to the endless abyss of S99program shell scripts and RC's
- Automatic Restart: When a daemon exits, restart that sucker.
- Centralized Administration: Manage operations through a handful of tools, not a pile of scripts.
There are more similarities, but I think those are the top four.
The purpose of this series is not to be an indepth expose on these systems, but to get a little taste and feel for each. Lots of people are talking about them without having experienced all them, so I want to fill that gap, but sadly an real deep dive of each would be far more time consuming than I can provide in my humble blog. :)
I look forward to reading a nice summary, it sounds interesting.
Chris Quenelle - 18 October '05 - 22:48
I look forward to your followup as well. One thing I didn’t notice in your “common” list was a formal definition of a service and being able to define service dependencies. I look forward to understanding how initNG and launchd address the concept of a “service”.John Clingan (Email) (URL) - 19 October '05 - 12:27
i know it skirts around the real problem by smoothing things over, but gentoo has a pretty cool init system compared to other nix’striplah - 19 October '05 - 17:16
Hey Triplah… No it doesn’t. Wrapping even more shell scripts around the pile of shell scripts isn’t a solution. Ok, rc-update is in some peoples books a good thing, but I don’t think so.Never the less, your not the only person that feels this way. Maybe we’ll look at the Gentoo rc system when we’ve finished talking about these three.
benr - 19 October '05 - 18:11
initng bears an interesting relationship considering gentoo in general (tis a gentoo developer who started the project, no?). While gentoo’s rc-management system wasn’t perfect, initng has largely adopted the best portions of it (the ng-update app is a functional clone of rc-update for good reason) while the minimizing rc/init crap that (most) gentoo users don’t have to deal with because of the round-about scripts used to manage init/rc. InitNG has been working near-flawlessly for me since the very first gentoo ebuild arrived, and the pace of development brings rapid improvement every week or so…the project seems to have made a lot of progress.jxn - 19 October '05 - 18:18
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