Misanthropy and programming
I don’t write often, and when I do, it’s about things I find interesting or that genuinely bother me. So this blog mostly ends up with two kinds of posts: technical musings and rants. If you want to skip what doesn’t interest you, use the tags.
Simple minimal root filesystems work well as a base for my humble container runtime, but it would be nice to have some flexibility while still keeping the root image intact. This is where overlayfs comes to the rescue.
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It’s time to get back to the problem I ran into earlier: the ps command inside the container was showing host processes. That clearly means something was missing. Time to employ the next kind of namespace — the mount namespace.
We need more cowbells isolation! At the moment my container runtime creates a new PID namespace, but somehow it still manages not to fully isolate the child process from the host.
And I definitely don’t want the child process to be root on the host machine. Time to fix that.
Time to finally start writing some code. I’ll begin this post by creating a project and end it with a program running inside a new PID namespace.
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So… how do you build a thing when you don’t really understand how that thing works? Where do you even begin?
Well, a journey of a thousand miles begins with a single step. I just need to take that step. Fortunately, I have a rough idea of how.
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That’s what the title says. Now, if you’re a sane person, you’re probably wondering how I ended up in this situation.
Allow me to explain…
more...This is my first blog post in probably 12 years. The last one I wrote was on Blogspot — if anyone even remembers what that is.
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