ConfigMaps

A ConfigMap provides a way to store configuration information and provide it to containers. A centralized way to store application configuration information. Can get injected to a container.

Con store in a file or provide key/valu pairs * Store in a file, key is the filname value is the file contents * provide the values on the command-line * ConfigMap manifest (yaml file)

Can be accessed by * Environment Variables (key / value) * ConfigMap Volume (access as files)

Creating

ConfigMap manifest

apiVersion: v1
kind: ConfigMap
metadata:
    name: settings
data:
    hello: world
    setting2: value

Use kubectl create or kubectl apply to load.

From k/v file

hello=world
setting2=value

kubectl create configmap [name] --from-file=[path-to-file]

From ENV file

kubectl create configmap [name] --from-env-file=[path-to-file]

From Literal

kubectl create configmap [name] --from-literal=apiUrl=https://my-api --from-literal=otherKey=otherValue

Get a configmap

Get a config map and output it as yaml.

kubectl get cm [name] -o yaml

By File vs By Environment

By file, config values can auto-update By env, injected in environment variables