inanzzz | Using ConfigMap to populate Kubernetes Pods with environment variables

You can populate Kubernetes Pods with environment variables either individually (env) or all in one go (envFrom). Prefer envFrom as it makes things very easy and clean.

Example

configmap.yaml

apiVersion: v1
kind: ConfigMap

metadata:
  name: address-finder-config

data:
  VERSION: ""
  HTTP_ADDRESS: :8888
  LOG_LEVEL: info
#  version: ""
#  http_address: :8888
#  log_level: info

deployment.yaml

apiVersion: apps/v1
kind: Deployment

metadata:
  name: address-finder-deployment
  labels:
    app: address-finder

spec:
  replicas: 1
  selector:
    matchLabels:
      app: address-finder
  template:
    metadata:
      labels:
        app: address-finder
    spec:
      containers:
        - name: golang
          image: you/address-finder:latest
          envFrom:
            - configMapRef:
                name: address-finder-config
#          env:
#            - name: VERSION
#              valueFrom:
#                configMapKeyRef:
#                  name: address-finder-config
#                  key: version
#            - name: HTTP_ADDRESS
#              valueFrom:
#                configMapKeyRef:
#                  name: address-finder-config
#                  key: http_address
#            - name: LOG_LEVEL
#              valueFrom:
#                configMapKeyRef:
#                  name: address-finder-config
#                  key: log_level