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Link to PID 1 article, remove SSH host key generation command

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Hongli Lai (Phusion)
2015-01-20 13:25:53 +01:00
parent fea2281ea6
commit 822e4c41fe
1 changed files with 2 additions and 5 deletions
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@@ -162,6 +162,8 @@ CMD ["/my_app/start.sh"]</pre>
<dl>
<dt>A <em>correct</em> init process</dt>
<dd>
<p><em>Main article: <a href="http://blog.phusion.nl/2015/01/20/docker-and-the-pid-1-zombie-reaping-problem/">Docker and the PID 1 zombie reaping problem</a></em></p>
<p>Here's how the Unix process model works. When a system is started, the first process in the system is called <a href="https://en.wikipedia.org/wiki/Init">the init process</a>, with PID 1. The system halts when this processs halts. If you call <code>CMD ["/my_app/start.sh"]</code> in your Dockerfile, then start.sh is your init process.</p>
<p>But the init process has an extra responsibility. It inherits all <a href="https://en.wikipedia.org/wiki/Orphan_process">orphaned child processes</a>. It is expected that the init process <a href="https://en.wikipedia.org/wiki/Wait_(system_call)">reaps them</a>.</p>
@@ -277,11 +279,6 @@ FROM phusion/baseimage:&lt;VERSION&gt;
# Set correct environment variables.
ENV HOME /root
# Regenerate SSH host keys. baseimage-docker does not contain any, so you
# have to do that yourself. You may also comment out this instruction; the
# init system will auto-generate one during boot.
RUN /etc/my_init.d/00_regen_ssh_host_keys.sh
# Use baseimage-docker's init system.
CMD ["/sbin/my_init"]