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A Deployment with replicas: 10 has the rolling update settings maxSurge: 25% and maxUnavailable: 25%. Which of the following correctly gives the upper limit of the total number of Pods and the lower limit of the number of available Pods during an update?

  1. AUpper limit 12, lower limit 8
  2. BUpper limit 13, lower limit 7
  3. CUpper limit 13, lower limit 8
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Answer: C. Upper limit 13, lower limit 8

When a percentage is converted into a number of Pods, maxSurge is rounded up and maxUnavailable is rounded down. 10 × 25% = 2.5, so maxSurge becomes 3 and maxUnavailable becomes 2. The upper limit of the total number of Pods is 10 + 3 = 13, and the lower limit of available Pods is 10 − 2 = 8. This rounding helps the update progress while ensuring that the number of available Pods never falls below the specified percentage.

  • A. This rounds maxSurge's 2.5 down. maxSurge is rounded up to 3.
  • B. This rounds maxUnavailable's 2.5 up. maxUnavailable is rounded down to 2.
  • C. Correct. 10 + 3 = 13 and 10 − 2 = 8.
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