Commits on Dec 13, 2016

1. Fix travis builds …

   After reading some articles [1] [2] yesterday about Docker and the "init"
   process I got to thinking about the problems that we've been seeing on Travis.
   The basic problem is that a Linux system may need an "init" process to work
   properly when processes become zombies. Docker by default doesn't handle this
   and the root process typically isn't an init process, so this can occasionally
   cause quite a few problems.
   
   We've been seeing spurious errors on Travis inside containers which look like
   OOM and such, but my guess is that zombie processes were being reparented to the
   top-level shell. The shell didn't expect the zombies and then behaved very
   strangely.
   
   This commit fixes these problems by using Yelp's "dumb-init" program [2] as the
   init process in all of our containers. This ensures that there's a valid init
   ready to reap children when they're reparented, which our test suite apparently
   generates a bunch of throughout the tests and such.
   
   [1]: https://blog.phusion.nl/2015/01/20/docker-and-the-pid-1-zombie-reaping-problem/
   [2]: https://engineeringblog.yelp.com/2016/01/dumb-init-an-init-for-docker.html

   

   alexcrichton committed Dec 13, 2016
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