The article specifically says the talk was "Intro to containers".
You wouldn't give an "intro to DNS" by describing how the attendees can build their own DNS server and resolver, using nothing but Bash and Perl, or "intro to Java" by showing how to create your own JVM.
I'm all in favour of anything that makes people aware that Docker didn't invent containers, and isn't the second coming of Jesus in the form of shitty code.
A practical look at how a basic LXC/LXD container operates, would be a better intro to containers. If you want to show people how to do it using basic shell tools, thats probably a follow on.
You wouldn't give an "intro to DNS" by describing how the attendees can build their own DNS server and resolver, using nothing but Bash and Perl, or "intro to Java" by showing how to create your own JVM.
I'm all in favour of anything that makes people aware that Docker didn't invent containers, and isn't the second coming of Jesus in the form of shitty code.
A practical look at how a basic LXC/LXD container operates, would be a better intro to containers. If you want to show people how to do it using basic shell tools, thats probably a follow on.