Ping K8s pods in parallel

pod-ping.sh

#! /bin/sh
##
## pod-ping.sh <src-pod> <dst-selector>
## Env:
##   SRC_NS - Source pod namespace
##   DST_NS - Destination pods namespace
## Example:
##   pod-ping.sh tserver-569b74646b-tnwzj app=tserver
##
if test -z "$2"; then
	grep '^##' $0 | cut -c3-
	exit 0
fi
tmp=/tmp/pod-ping-$$
mkdir -p $tmp/pod
die() {
	echo "ERROR: $*" >&2
	rm -rf $tmp
	exit 1
}

# podping <dst-pod>
#	SRC_POD - Source pod name
podping() {
	local status=DEAD
	local ip=$(kubectl get -n $DST_NS $1 -o json | jq -r .status.podIP)
	#echo $ip
	kubectl exec -n $SRC_NS $SRC_POD -- ping -c1 -W1 $ip > /dev/null 2>&1 && status=ALIVE
	echo "$ip $status" > $tmp/$1
}
test -n "$SRC_NS" || SRC_NS=default
test -n "$DST_NS" || DST_NS=default
SRC_POD=$1
kubectl exec -n $SRC_NS $SRC_POD -- ping -c1 -W1 127.0.0.1 > /dev/null || \
	die "Can't exec ping in [$SRC_NS/$SRC_POD]"

for dst in $(kubectl get pods -n $DST_NS -l $2 -o name); do
	podping $dst &
done
wait

grep -r DEAD $tmp/pod | sed -e "s,$tmp/pod/,,"
echo "Succesful pings $(grep -r ALIVE $tmp/pod | wc -l)"
rm -rf $tmp