Codelab

Go to https://console.developers.google.com/apis/api/compute.googleapis.com/overview and enable compute + billing.
Modify cluster_vars to point to the right version of Kubernetes, and the right GCP project name.
Run ./create_cluster.sh - this only needs to be done once per CTF.
Modify challenge-skeleton/challenge.yaml and modify the image path to point to the right project name.
Run ./create_image.sh challenge-skeleton - this only needs to be done if you want to build the challenge, but not to deploy it.
Run ./deploy.sh challenge-skeleton - this builds and deploys the challenge, but doesn't expose it to the internet.
Run ./expose.sh challenge-skeleton - this exposes the challenge to the internet (does not build it).
Run nc $theip 1 - this connects you to the challenge.
Edit pow.yaml and change the 0 to 1, then run ./update.sh challenge-skeleton - this enables the proof of work.
Run nc $theip 1 - this connects you to the challenge with a proof of work in front.
Run ./kill_challenge.sh challenge-skeleton - this kills the challenge.
Run nc $theip 1 - this will not work anymore.

Future Work

Automate the setup of cluster_vars, and have a command that generates challenge.yaml.
Cleanup the proof of work to point somewhere that isn't the ccc website.

Calculate the resources and the amount of budget assuming 100% consumption.
Add a budget alert at 25% budget, 50% budget, 75% budget and 100% of budget.
Plan for the CTF to last 50% longer than it will, increase proof of work on challenges using too much CPU.

If you forget to update the kubernetes version in cluster_vars, you get an error saying that it's not supported.
If you forget to update the project name in challenge-skeleton/challenge.yaml, you get an error referencing espr-k8s
If you can't connect to port 1 of the IP address, that's probably because the challenge didnt deploy.

Go to https://console.cloud.google.com/kubernetes/list and click on services.
Look for the challenge, and click on it to reach the kubernetes service page for the challenge.

From the kubernetes service page for the challenge.
Under overview, look for "Service Pods", click on one of them.
On the top right corner there's a "KUBECTL" button, click on it, and then on "Exec" and then on the task name.
On the Cloud Shell, modify the end of command from -- ls to -it -- /bin/bash and run cd home/user.