How is secret management implemented in Kubernetes, and how do developers interact with secrets when developing applications?

In Kubernetes, secret management is handled using an object of type Secret, which stores confidential data (passwords, tokens, keys) in encrypted or base64-encoded form.

For interacting with secrets when developing applications:

• Secrets can be mounted as files in the container or passed as environment variables.
• The application reads these data from mounted files or variables, without storing them in the code.
• Secrets are created and updated using kubectl or YAML manifests.

Example of mounting a secret as an environment variable:

apiVersion: v1
kind: Pod
metadata:
  name: example-pod
spec:
  containers:
  - name: app
    image: myapp
    env:
    - name: DB_PASSWORD
      valueFrom:
        secretKeyRef:
          name: db-secret
          key: password

This approach enhances security and simplifies management of confidential data in the cluster.