Don't use supervisor as the init process

[parente]

See jupyter/notebook#334 (comment) for background.

Possible fixes ...

1. Switch to phusion/baseimage. Concern: size and change of OS.

   phusion/baseimage              latest              e9f50c1887ea        7 weeks ago         237.7 MB
   ubuntu                         14.04               d2a0ecffe6fa        8 weeks ago         188.4 MB
   debian                         wheezy              065218d54d7d        11 weeks ago        84.97 MB
   

2. Use runit like phusion/baseimage does (http://www.sourcediver.org/blog/2014/11/17/using-runit-in-a-docker-container/). Concern: env var workaround described therein.

3. Port phusion/baseimage to debian. Concern: yet another thing to maintain.

4. Wait for docker to give reaping "for free" (Evented Process Monitor moby/moby#11529).

[krallin]

Hey there,

I apologize for the shameless plug, but I noticed you were considering using phusion/baseimage for its zombie reaping capabilities but were concerned about the size and having to port it to Debian.

I happen to have written a tool just for that. It's called tini, and it's used in a handful of official Docker images (see here: https://github.com/docker-library/official-images#init) — although it's not officially endorsed. Thought you might want to have a look!

If you're curious; you can find it here on Github: https://github.com/krallin/tini

[mjbright]

I love the name already, 'tini' !

On 10 September 2015 at 19:45, Thomas Orozco notifications@github.com
wrote:

Hey there,

I apologize for the shameless plug, but I noticed you were considering
using phusion/baseimage for its zombie reaping capabilities but were
concerned about the size and having to port it to Debian.

I happen to have written a tool just for that. It's called tini, and it's
used in a few official Docker images (see here:
https://github.com/docker-library/official-images#init). You might want
to have a look.

If you're curious; you can find it here on Github:
https://github.com/krallin/tini

—
Reply to this email directly or view it on GitHub
#24 (comment)
.

[parente]

@krallin thanks for sharing! I will definitely look into it.

[parente]

Started a branch with tini replacing supervisord. Works as advertised. I need to beat up each image a bit more to ensure there's no surprises.

One point worth clarifying: we're still going to have to set tini to run as root in the images, not because it needs to do so but because our start-notebook.sh script supports options that require root privileges, namely the jovyan UID switch and granting sudo.

[jakirkham]

Sounds cool. I've been trying out tini, as well. I'd be curious to know what you find out from your stress tests, @parente.