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  1. OpenShift Bugs
  2. OCPBUGS-42238

Multus daemonset requires graceful termination [cno integration]

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    • Icon: Bug Bug
    • Resolution: Done
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    • 4.18
    • Networking / multus
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      Description of problem:

          This PR introduces graceful shutdown functionality to the Multus daemon by adding a /readyz endpoint alongside the existing /healthz. The /readyz endpoint starts returning 500 once a SIGTERM is received, indicating the daemon is in shutdown mode. During this time, CNI requests can still be processed for a short window. The daemonset configs have been updated to increase terminationGracePeriodSeconds from 10 to 30 seconds, ensuring we have a bit more time for these clean shutdowns.This addresses a race condition during pod transitions where the readiness check might return true, but a subsequent CNI request could fail if the daemon shuts down too quickly. By introducing the /readyz endpoint and delaying the shutdown, we can handle ongoing CNI requests more gracefully, reducing the risk of disruptions during critical transitions.

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      How reproducible:

          Difficult to reproduce, might require CI signal

              pliurh Peng Liu
              dosmith Douglas Smith
              Weibin Liang Weibin Liang
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