CKAD maxSurge Practice Question

Correct answer & explanation

MaxSurge: 5 and maxUnavailable: 2 means during the rolling update, up to 2 pods can be unavailable (below the desired 4) and up to 5 extra pods can be created above the desired count, allowing a total of 9 pods at peak. This satisfies the requirement that at most 2 pods are unavailable and at most 5 pods are above the desired replica count. Option D is correct because 125% of 4 equals 5, and 50% of 4 equals 2, so the effective limits are the same as option C. Option B is incorrect because maxUnavailable: 0 prevents any pod from becoming unavailable during the update, making it impossible to delete old pods without violating the constraint. A rolling update requires some pods to become temporarily unavailable when they are terminated; with maxUnavailable=0, the update cannot proceed because no pod can be terminated. Thus, the configuration does not achieve a successful rolling update. Options A and E are incorrect because they allow more than 2 pods unavailable (A: maxUnavailable=3) or allow only 1 extra pod (E: maxSurge=1), not the required 5.