Add an environment variable to a deployment myapp from a secret mysecret?

• A. oc set env deployment/myapp --from secret/othersecret
• B. oc set env deployment/myapp --from secret/mysecret
• C. oc set env deployment/myapp --from secret/mysecret --overwrite
• D. oc set env deployment/myapp --from secret/mysecret --container myapp

Answer: (B)

Adding environment variables from a secret to a deployment uses the command that imports every key from the secret as environment variables in the deployment’s pods. For a deployment named myapp and a secret named mysecret, the appropriate command is oc set env deployment/myapp --from secret/mysecret. This approach applies the secret’s keys as env vars to all containers in the deployment; you’d only add --container if you needed to target a specific container within the pod. The other options either reference the wrong secret, introduce unnecessary overwriting, or unnecessarily constrain the operation to a single container.