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27 Nov 2023

Rancher secrets and config maps

Using Kubernetes envFrom for environment variables describes how to get env variables from config map or secret, copying here:

#####################  
### deployment.yml
#####################  
# Use envFrom to load Secrets and ConfigMaps into environment variables

apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: mans-not-hot
  labels:
    app: mans-not-hot
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mans-not-hot
  template:
    metadata:
      labels:
        app: mans-not-hot
    spec:
      containers:
        - name: app
          image: gcr.io/mans-not-hot/app:bed1f9d4
          imagePullPolicy: Always
          ports:
            - containerPort: 80
          envFrom:
          - configMapRef:
              name: env-configmap
          - secretRef:
              name: env-secrets
#####################  
### env-configmap.yml
#####################  
# Use config map for not-secret configuration data

apiVersion: v1
kind: ConfigMap
metadata:
  name: env-configmap
data:
  APP_NAME: Mans Not Hot
  APP_ENV: production
  
#####################  
### env-secrets.yml
#####################  
# Use secrets for things which are actually secret like API keys, credentials, etc
# Base64 encode the values stored in a Kubernetes Secret: $ pbpaste | base64 | pbcopy
# The --decode flag is convenient: $ pbpaste | base64 --decode

apiVersion: v1
kind: Secret
metadata:
  name: env-secrets
type: Opaque
data:
  DB_PASSWORD: cDZbUGVXeU5e0ZW
  REDIS_PASSWORD: AAZbUGVXeU5e0ZB
@caiquecastro

This is neater than what I used before, listing literally all of them:

spec:
  containers:
    - name: name
      image: image
      env:
        - name: BUCKET_NAME
          valueFrom:
            configMapKeyRef:
              name: some-config
              key: BUCKET_NAME
Nel mezzo del deserto posso dire tutto quello che voglio.
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