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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 debug -n $namespace $name --image=cr.l5d.io/linkerd/debug:stable-2.12.0 -it -- cat /proc/net/tcp) | |
| close_wait=$(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" | |
@dwilliams782 yes, this requires that ephemeral container support is enabled on the cluster. otherwise you will need to add the debug containers at inject time. see: https://linkerd.io/2.12/tasks/using-the-debug-container/
Cool! NP - I haven't dug into that debug container use case but it sounds like it might help with my most recent issue - link
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error: ephemeral containers are disabled for this cluster (error from server: "the server could not find the requested resource").