K8s env configMapKeyRef.optional

1 개요

k8s configMapKeyRef.optional

a.yaml

apiVersion: v1
kind: Pod
metadata:
  name: dapi-test-pod
spec:
  containers:
  - name: test-container
    image: k8s.gcr.io/busybox
    command: [ "/bin/sh", "-c", "env" ]
    env:
    - name: SPECIAL_LEVEL_KEY
      valueFrom:
        configMapKeyRef:
          name: special-config
          key: SPECIAL_LEVEL
    - name: SPECIAL_TYPE_KEY
      valueFrom:
        configMapKeyRef:
          name: special-config
          key: SPECIAL_TYPE
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: special-config
  namespace: default
data:
  SPECIAL_LEVEL: very
  #SPECIAL_TYPE: charm

$ kubectl apply -f a.yaml
pod/dapi-test-pod created
configmap/special-config created
$ kubectl get pod dapi-test-pod
NAME            READY   STATUS                       RESTARTS   AGE
dapi-test-pod   0/1     CreateContainerConfigError   0          97s

a.yaml

apiVersion: v1
kind: Pod
metadata:
  name: dapi-test-pod
spec:
  containers:
  - name: test-container
    image: k8s.gcr.io/busybox
    command: [ "/bin/sh", "-c", "env" ]
    env:
    - name: SPECIAL_LEVEL_KEY
      valueFrom:
        configMapKeyRef:
          name: special-config
          key: SPECIAL_LEVEL
    - name: SPECIAL_TYPE_KEY
      valueFrom:
        configMapKeyRef:
          name: special-config
          key: SPECIAL_TYPE
          optional: true
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: special-config
  namespace: default
data:
  SPECIAL_LEVEL: very
  #SPECIAL_TYPE: charm

$ kubectl delete -f a.yaml; kubectl apply -f a.yaml
pod "dapi-test-pod" deleted
configmap "special-config" deleted
pod/dapi-test-pod created
configmap/special-config created
$ kubectl get pod dapi-test-pod
NAME            READY   STATUS             RESTARTS   AGE
dapi-test-pod   0/1     CrashLoopBackOff   3          67s
$ kubectl logs dapi-test-pod | grep SPECIAL
SPECIAL_LEVEL_KEY=very

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