We have deployed some of the services (like Web API) on Azure Kubernetes. When we logged onto the Azure Kubernetes Pods and execute the printenv on the terminal, it shows environment variable on the screen including the service we deployed like
<SERVICENAME>_PORT=
<SERVICENAME>_HOST=`
.....
How can we read above variable value in the .Net code? I tried with the below code but it didn't work
var builder = new ConfigurationBuilder();
builder.AddJsonFile("appsettings_prod.json", true, true).AddEnvironmentVariables();
Configuration = builder.Build();
var port = Configuration["<SERVICENAME>_PORT"] You can also use downward-api to expose pod information to containers.
To access env from k8s pods, you need to provide those env through pod's spec.containers[].env[].
apiVersion: v1
kind: Pod
metadata:
name: demo-pod
spec:
containers:
- name: mycontainer
image: demo/new-image
env:
# define env from k8s secret (used specially for credentials)
- name: SECRET_USERNAME
valueFrom:
secretKeyRef:
name: mysecret
key: username
# define env from configmap
- name: SPECIAL_CREDENTIALS
valueFrom:
configMapKeyRef:
name: configmap-name
key: config.json
# define value directly
- name: DEMO_GREETING
value: "Hello from the environment"If you want to pass the environment variable to code you can use the value of config map of kubernetes. it will set the value in environment os of pod and in code you can get it from there.
for secure data you can use the secret.