Which command verifies that a private image stream has been created and is ready for use?

Which command verifies that a private image stream has been created and is ready for use?

• A. oc get istag
• B. oc get is
• C. oc describe is image-stream-name
• D. oc get imagestreams

Answer: (A)

Focusing on the specific tag within an image stream is what matters when you want to know a private image stream is ready for use. An ImageStreamTag is the resource that represents a single tag of an image stream, and it directly ties the tag to the actual image in your registry. Running the command to list image stream tags shows whether that tag exists and what image it references. If you see an image reference or digest for that tag, the image has been imported from the private registry and is ready to be used by builds or deployments. The other commands are less direct for this purpose. Listing the image stream itself shows the stream as a whole, not the readiness of a specific tag. Describing the image stream provides more detail about the stream, but you still must inspect the tag to confirm its readiness. Listing all image streams similarly doesn’t confirm a particular tag’s current image.

Focusing on the specific tag within an image stream is what matters when you want to know a private image stream is ready for use. An ImageStreamTag is the resource that represents a single tag of an image stream, and it directly ties the tag to the actual image in your registry. Running the command to list image stream tags shows whether that tag exists and what image it references. If you see an image reference or digest for that tag, the image has been imported from the private registry and is ready to be used by builds or deployments.

The other commands are less direct for this purpose. Listing the image stream itself shows the stream as a whole, not the readiness of a specific tag. Describing the image stream provides more detail about the stream, but you still must inspect the tag to confirm its readiness. Listing all image streams similarly doesn’t confirm a particular tag’s current image.