Recording terminal demos

This repo contains scripts for Project Calico demos.

Recording these demos isn't trivial because the actions is happening across multiple hosts.

It's based around a couple of useful pieces of technology

• "Docker in Docker" - to simulate multiple hosts
• tmux to show the connections to both hosts in a single terminal

Running these demos is based around a Makefile.

Workflow

• make create-hosts - Creates the DinD hosts and sets them up for running Calico
• make create-tmux - Creates a tmux session with two panes. They are connected to the two DinD hosts
• make attach - Attaches to the tmux session.

These can be chained together - make create-hosts create-tmux attach

make create-hosts can be slow (it has to load the calico-node images onto the hosts), so instead use make clean-hosts

• make create-hosts create-tmux attach

Recording demos

The demos can be recorded using one of the many terminal recording programs that are available. Asciinema is a very good option.

In one terminal run

make clean-hosts create-tmux resize
asciinema rec -y -c "tmux a" -t "Calico and libnetwork" libnetwork

Then in another run

./libnetwork-demo.sh

Playback of recordings

asciinema play libnetwork

Uploading demos

asciinema upload libnetwork

Converting to gif

See https://github.com/tomdee/asciinema2gif

e.g.