ConfigMaps

---

• ConfigMaps are used to pass configuration data in the form of key-value pairs.
• Pod can consume these key-value pairs as environment variables for the application running inside it.

apiVersion: v1
kind: ConfigMap
metadata:
  name: my-config
data:
  key1: config1
  key2: config2

---

To get config maps key-value pairs as environment variables. we can define it in pod definition file

apiVersion: v1
kind: Pod
metadata:
  name: server
  labels:
    env: sandbox
spec:
   containers:
      - name: nginx
        image: nginx
        envFrom: 
	      - configMapRef:
		      name: my-config

---

To get single env from config we can use

        env:
	      - name: key1
	        valueFrom:
			    configMapKeyRef:
			      name: my-config
			      key: key1

---

Commands

1. create configmap without YAML (imperative command)

kubectl create configmap <name>

2. create configmap with YAML (declarative command)

kubectl create -f configmap-definition.yaml

3. create configmap with values

kubectl create configmap my-config --from-literal=key1=config1 --from-literal=key2=config2

4. create configmap from file

kubectl create configmap my-config --from-file=path/to/file

5. get configmaps

kubectl get configmaps

6. describe configmaps

kubectl describe configmaps

---

⬅️ Service | Secrets ➡️

References

1. https://kubernetes.io/docs/concepts/configuration/configmap/