Detect half-open connections in Kubernetes
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#!/bin/bash | |
pods=$(kubectl get po -A -l linkerd.io/control-plane-ns -ojsonpath="{range .items[*]}{.metadata.name} {.metadata.namespace}{'\n'}{end}") | |
IFS=" " | |
while read name namespace; do | |
tcp=$(kubectl exec -n $namespace $name -c linkerd-proxy -- cat /proc/net/tcp) | |
close_wait=$(echo $tcp | awk 'BEGIN {cnt=0} $4==08 {cnt++} END {print cnt}') | |
fin_wait_2=$(echo $tcp | awk 'BEGIN {cnt=0} $4==05 {cnt++} END {print cnt}') | |
if [ "$close_wait" -gt "0" -o "$fin_wait_2" -gt "0" ]; then | |
echo "$name.$namespace has $close_wait sockets in CLOSE_WAIT and $fin_wait_2 sockets in FIN_WAIT_2" | |
else | |
echo "$name.$namespace is okay" | |
fi | |
done <<< "$pods" | |
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