I'm trying to figure it out, how to change one string inside configmap in Kubernetes. I have pretty simple configmap:
apiVersion: v1
data:
config.cfg: |-
[authentication]
USERNAME=user
PASSWORD=password
[podname]
PODNAME=metadata.podName
kind: ConfigMap
metadata:
name: name_here
And I need to mount the configmap inside a couple of pods. But PODNAME should be matched to current podname. Is it possible in any another way? thanks!
CodePudding user response:
I do not think it could be done with ConfigMap. But you can set environment variables in your pod spec that references a pod fields.
apiVersion: v1
kind: Pod
metadata:
name: test-ref-pod-name
spec:
containers:
- name: test-container
image: busybox
command: [ "sh", "-c"]
args:
- env | grep PODNAME
env:
- name: PODNAME
valueFrom:
fieldRef:
fieldPath: metadata.name
restartPolicy: Never
See official documentation: https://kubernetes.io/docs/tasks/inject-data-application/environment-variable-expose-pod-information/#use-pod-fields-as-values-for-environment-variables
CodePudding user response:
This doesn't answer you question exactly but the pod name normally ends up as the host name inside the pod and can be accessed as a standard environment variable
echo $HOSTNAME