Providing a .env file in Kubernetes - kubernetes

Question

How do I provide a .env file in Kubernetes. I am using a Node.JS package that populates my process.env via my .env file.

Answer 1

You can do it in two ways:
Providing env variable for the container:
During creation of a pod, you can set environment variables for the containers that run in that Pod. To set environment variables, include the env field in the configuration file.
ex:
apiVersion: v1
kind: Pod
metadata:
name: envar-demo
labels:
purpose: demonstrate-envars
spec:
containers:
- name: envar-demo-container
image: gcr.io/google-samples/node-hello:1.0
env:
- name: DEMO_GREETING
value: "Hello from the environment"
- name: DEMO_FAREWELL
value: "Such a sweet sorrow"
Using ConfigMaps:
first you need to create a ConfigMaps, ex is below, here data field refers your values in a key-value pair.
apiVersion: v1
kind: ConfigMap
metadata:
name: special-config
namespace: default
data:
SPECIAL_LEVEL: very
SPECIAL_TYPE: charm
Now, use envFrom to define all of the ConfigMap's data as container environment variables, ex:
apiVersion: v1
kind: Pod
metadata:
name: dapi-test-pod
spec:
containers:
- name: test-container
image: k8s.gcr.io/busybox
command: [ "/bin/sh", "-c", "env" ]
envFrom:
- configMapRef:
name: special-config
restartPolicy: Never
you can even specify individual field by giving env like below:
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
Ref: configmap and env set