After a blue/green cutover attempt, clients still reach old blue Pods. Investigation shows the Service selector was never updated. What went wrong?
Select an answer to reveal the explanation.
Short Explanation
You built the green stage but left the ushers’ map pointing at blue. If the Service selector still says blue, traffic never moves. Fix the labels/selector—don’t blame TLS or demand blue’s deletion first.
Full Explanation
Blue/green cutover depends on the Service (or equivalent) selecting the green Pods. If selectors still match only blue labels, Endpoints remain on blue. Certificate rotation and forcing blue ReplicaSet deletion are not substitutes for correcting the selector.