Docker – Get YAML for deployed Kubernetes services

dockergoogle-container-registrygoogle-kubernetes-enginekubernetesyaml

I am trying to deploy my app to Kubernetes running in Google Container
Engine.

The app can be found at: https://github.com/Industrial/docker-znc.

The Dockerfile is built into an image on Google Container Registry.

I have deployed the app in Kubernetes via the + button. I don't have the YAML
for this.

I have inserted a Secret in Kubernetes for the PEM file required by the app.

How do I get the YAML for the Deployment, Service and Pod created by
Kubernetes by filling in the form?
How do I get the Secret into my Pod for usage?

Best Answer

To get the yaml for a deployment (service, pod, secret, etc):

kubectl get deploy deploymentname -o yaml

Related Solutions

Json – the difference between YAML and JSON

Technically YAML is a superset of JSON. This means that, in theory at least, a YAML parser can understand JSON, but not necessarily the other way around.

See the official specs, in the section entitled "YAML: Relation to JSON".

In general, there are certain things I like about YAML that are not available in JSON.

As @jdupont pointed out, YAML is visually easier to look at. In fact the YAML homepage is itself valid YAML, yet it is easy for a human to read.
YAML has the ability to reference other items within a YAML file using "anchors." Thus it can handle relational information as one might find in a MySQL database.
YAML is more robust about embedding other serialization formats such as JSON or XML within a YAML file.

In practice neither of these last two points will likely matter for things that you or I do, but in the long term, I think YAML will be a more robust and viable data serialization format.

Right now, AJAX and other web technologies tend to use JSON. YAML is currently being used more for offline data processes. For example, it is included by default in the C-based OpenCV computer vision package, whereas JSON is not.

You will find C libraries for both JSON and YAML. YAML's libraries tend to be newer, but I have had no trouble with them in the past. See for example Yaml-cpp.

How to do block comments in YAML

YAML supports inline comments, but does not support block comments.

From Wikipedia:

Comments begin with the number sign ( # ), can start anywhere on a line, and continue until the end of the line

A comparison with JSON, also from Wikipedia:

The syntax differences are subtle and seldom arise in practice: JSON allows extended charactersets like UTF-32, YAML requires a space after separators like comma, equals, and colon while JSON does not, and some non-standard implementations of JSON extend the grammar to include Javascript's /* ... */ comments. Handling such edge cases may require light pre-processing of the JSON before parsing as in-line YAML.

# If you want to write
# a block-commented Haiku
# you'll need three pound signs

Best Answer

Related Solutions

Json – the difference between YAML and JSON

How to do block comments in YAML

Related Topic