Commits on Sep 20, 2017

1. UPSTREAM: 47806: kubelet: fix inconsistent display of terminated pod … …

   …IPs by using events instead
   
   PLEG and kubelet race when reading and sending pod status to the apiserver.  PLEG
   inserts status into a cache, and then signals kubelet.  Kubelet then eventually
   reads the status out of that cache, but in the mean time the status could have
   been changed by PLEG.
   
   When a pod exits, pod status will no longer include the pod's IP address because
   the network plugin/runtime will report "" for terminated pod IPs.  If this status
   gets inserted into the PLEG cache before kubelet gets the status out of the cache,
   kubelet will see a blank pod IP address.  This happens in about 1/5 of cases when
   pods are short-lived, and somewhat less frequently for longer running pods.
   
   To ensure consistency for properties of dead pods, copy an old status update's
   IP address over to the new status update if (a) the new status update's IP is
   missing and (b) all sandboxes of the pod are dead/not-ready (eg, no possibility
   for a valid IP from the sandbox).
   
   Fixes: kubernetes/kubernetes#47265
   Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1449373

   

   dcbw committed Sep 20, 2017
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