Which OpenShift resource allows referencing a specific image tag within an ImageStream to trigger a deployment?

Which OpenShift resource allows referencing a specific image tag within an ImageStream to trigger a deployment?

• A. ImageStreamTag.
• B. ImageStream.
• C. DeploymentConfig.
• D. Secret.

Answer: (A)

ImageStreamTag is the resource that represents a concrete tag inside an ImageStream, such as my-app:1.2. It’s what DeploymentConfig can reference in its image change triggers so that whenever that specific tag is updated with a new image, a deployment is triggered to roll out the new image. The ImageStream itself is a collection of tags, not a single tag reference. DeploymentConfig is the object being deployed, and while it can use image change triggers, it doesn’t by itself specify which exact tag to watch. Secrets are unrelated to image tagging and deployment triggers.

ImageStreamTag is the resource that represents a concrete tag inside an ImageStream, such as my-app:1.2. It’s what DeploymentConfig can reference in its image change triggers so that whenever that specific tag is updated with a new image, a deployment is triggered to roll out the new image. The ImageStream itself is a collection of tags, not a single tag reference. DeploymentConfig is the object being deployed, and while it can use image change triggers, it doesn’t by itself specify which exact tag to watch. Secrets are unrelated to image tagging and deployment triggers.