[CKA] 따배씨 - 16. ConfigMap 운영

문제

Set configuration context: kubectl config use-context k8s Expose Configuration settings Task: All operations in this question should be performed in the ckad namespace. Create a ConfigMap called web-config that contains the following two entries: connection_string=localhost:80 external_url=cncf.io . Run a pod called web-pod with a single container running the nginx:1.19.8-alpine image, and expose these configuration settings as environment variables inside the container."

문제 풀이

# 1. Context 변경
kubectl config use-context k8s



# 2.네임 스페이스 확인(미존재시 생성)
kubectl get namespaces ckad
kubectl create namespace ckad

# 3. ConfigMap 생성
kubectl create configmap web-config --from-literal=connection_string=localhost:80 --from-literal external_url=cncf.io --namespace ckad
kubectl get configmaps web-config -n ckad -o yaml



# 4. web-pod yaml 파일 생성
kubectl run web-pod --image=nginx:1.19.8-alpine -o yaml --dry-run=client > web-pod.yaml

vim web-pod.yaml

....
apiVersion: v1
kind: Pod
metadata:
  labels:
    run: web-pod
  name: web-pod
  namespace: ckad
spec:
  containers:
  - image: nginx:1.19.8-alpine
    name: web-pod
    envFrom:
      - configMapRef:
          name: web-config



# 5. web-pod 생성 및 env 확인
kubectl apply -f web-pod.yaml
kubectl exec -it -n ckad web-pod -- env

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

ConfigMaps