Azure Kubernetes - Overwrite the configmap values using environment variables? - azure

Question

I am reading the configuration details from the configmap as shown below
apiVersion: v1
kind: ConfigMap
metadata:
namespace: akv2k8s-test
name: akv2k8s-test
data:
Log_Level: Debug
Alert_Email: Test#demo.com
pod definition
apiVersion: v1
kind: Pod
metadata:
name: akv2k8s-test
namespace: akv2k8s-test
spec:
containers:
- name: akv2k8s-env-test
image: kavija/python-env-variable:latest
envFrom:
- configMapRef:
name: akv2k8s-test
and reading it with python
import os
loglevel = os.environ['Log_Level']
alertemail = os.environ['Alert_Email']
print("Running with Log Level: %s, Alert Email:%s" % (loglevel,alertemail))
I want to update the Configuration values while deploying, the below command fails
kubectl apply -f deploy.yaml --env="Log_Level=error"
How do I pass the environment variable while deploying?

Answer 1

Since you want to update the configmap while deplyoing, The easiest way would be by getting the file content using cat and then update as you wish -
cat configmap.yaml |sed -e 's|Log_Level: Debug|Log_Level: error|' | kubectl apply -f -
In case you want to update the existing configmap, use kubectl patch command.
kubectl patch configmap/akv2k8s-test -n akv2k8s-test --type merge -p '{"data":{"Log_Level":"error"}}'