Exercise — writing YAML

Let's write YAML manifests for the wordsmith app!

It can be a single YAML file or multiple files in a directory.

See next slides for testing instructions and hints.

How to test our YAML

If XYZ is that YAML file (or directory with YAML files), we should be able to:

Create a new namespace, e.g. foo123
Deploy wordsmith with a single command

(e.g. kubectl apply --namespace foo123 -f XYZ)
Find out the connection information for web

(e.g. kubectl get service web --namespace)
Connect to it and see the wordsmith app

See next slide for hints.

There are at least three methods to write our YAML.

Dump the YAML of existing wordsmith deployments and services.

(we can dump YAML with kubectl get -o yaml ...)
Adapt existing YAML (from the docs or dockercoins).

(for reference, kubercoins is at https://github.com/jpetazzo/kubercoins)
Write it entirely from scratch.

See next slide for more hints.

Scroll one slide at a time to see hints.

One option is to start with the YAML from kubercoins.

Adapt the YAML of a deployment (e.g. worker) to run "web".

We need to change the name, labels, selectors, and image.

Then adapt the YAML of a service (e.g. webui).

We need to change the name, labels, selectors, possibly port number.

Repeat for the other components.