Typorithm · easy

ConfigMap

configmapkubernetesconfigdecouplingenv

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Full lesson · 8 learning steps Open any exercise for focused practice

Step 1 of 8 · intro card

Learn ConfigMap

Config & Scaling

A ConfigMap holds non-secret key/value config; envFrom.configMapRef injects every key as an env var, decoupling configuration from the image.

A ConfigMap externalizes configuration so the same image can run across environments by swapping the ConfigMap, not rebuilding.

The data block stores plain string key/value pairs; pods read them as environment variables or mounted files.

envFrom.configMapRef injects all keys at once, while env.valueFrom.configMapKeyRef pulls a single key by name.

data holds plain string key/value pairs.

envFrom.configMapRef injects every key.

configMapKeyRef pulls one specific key.

apiVersion: v1
kind: ConfigMap
metadata:
  name: app-config
data:
  LOG_LEVEL: "info"
  APP_MODE: "production"
---
apiVersion: v1
kind: Pod
metadata:
  name: web
spec:
  containers:
    - name: web
      image: nginx:1.27
      envFrom:
        - configMapRef:
            name: app-config

Read the implementation

Connect each part of the code to the concept before you type.

1. ConfigMap object

A ConfigMap stores non-secret key/value config separate from the container image.

kind: ConfigMap

2. Config data

The data block holds plain string key/value pairs the app reads at runtime.

data:
  LOG_LEVEL: "info"
  APP_MODE: "production"

3. Inject all keys

envFrom.configMapRef injects every key in the ConfigMap as an environment variable.

envFrom:
        - configMapRef:
            name: app-config

A complete learning loop

Understand

Read the concept map and follow the code breakdown.

Reconstruct

Type the implementation, repair mistakes and work through every recall exercise.

Verify

Use the final check without hints; revisit weak concepts in short practice sessions.