Re: anopa: init system/service manager built around s6

From: Avery Payne <>
Date: Fri, 10 Apr 2015 21:51:52 -0700

On 4/10/2015 6:41 PM, Aristomenis Pikeas wrote:
> Laurent (s6-rc), Olivier (anopa), Toki (supervision framework), and Gorka (s6-overlay),
> I'm having a lot of trouble figuring out the differences between your projects. The s6 suite of utils can be considered building blocks for a full init system, but what does each of your projects do on top of s6?

A breakdown of differences:

+ s6-rc: Laurent's version of an init system based on s6, meant to bring
a machine up/down.

+ anopa: Olivier's version of an init system base on s6, meant to bring
a machine up/down.

+ supervision framework: Toki's version of a complete framework-agnostic
init system, partially geared towards OpenRC. Last I checked he had
progressed into supporting a complete init (with OpenRC support).

+ s6-overlay: this is meant for Docker containers, and is most likely
the one you want.

Yes, there is duplication of effort between Laurent and Olivier, that's
ok though - I personally argue that choice is a good thing. :) There
are actually many, many projects out there, if you know what to look
for, that might provide clues or insights. Ignite on github I believe
has some rudimentary init stuff in it, although it's runit based.

> For a bit of context, my goal is the simplest init system that could possibly work, to be run inside of a docker container. I need to start services and gracefully handle SIGTERM/SIGKILL, with everything logged to standard out. That's about it. But this is proving to be difficult with s6. I've been chipping away at things, but it's slow going between understanding all of the tricky bash-isms and learning about all of the relevant s6 components.
If by "tricky bash-isms" you mean the shell redirections and exec and
all of that, well...once you can visualize it, it's not that bad
really. I don't believe any of the projects use bash directly. Toki's
project (as well as my own) assume /bin/sh, which at this time usually
means an ash variant. Laurent and Olivier have *nothing* done in bash
(beyond the build process). If anything, I think all of the projects
are trying hard to avoid "bash specific" implementations; believe me
when I say, I've looked at *a lot* of shell scripting in the last 5
months, and I can say that a lot of projects with shell scripts are
actually fairly clean. (Yes, I sound a little surprised when I say that)
Received on Sat Apr 11 2015 - 04:51:52 UTC

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