Increased server replicas

iperf3-k8s-flood.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+
+set -eu
+
+cd $(dirname $0)
+
+## <setup>
+
+kubectl create -f iperf3.yaml
+
+until $(kubectl get pods -l app=iperf3-server -o jsonpath='{.items[0].status.containerStatuses[0].ready}'); do
+    echo "Waiting for iperf3 server to start..."
+    sleep 5
+done
+
+echo "Server is running"
+echo
+
+CLIENTS=$(kubectl get pods -l app=iperf3-client -o name | cut -d'/' -f2)
+
+for POD in ${CLIENTS}; do
+    until $(kubectl get pod "${POD}" -o jsonpath='{.status.containerStatuses[0].ready}'); do
+        echo "Waiting for ${POD} to start..."
+        sleep 5
+    done
+done
+
+echo "All clients are running"
+echo
+
+kubectl get pod -o=custom-columns=NAME:.metadata.name,NODE:.spec.nodeName,IP-NODE:.status.hostIP,IP-POD:status.podIP
+
+echo
+
+## </setup>
+## <run>
+
+CLIENTS=$(kubectl get pods -l app=iperf3-client -o name | cut -d'/' -f2)
+
+for POD in ${CLIENTS}; do
+    HOST=$(kubectl get pod "${POD}" -o jsonpath='{.status.hostIP}')
+    kubectl exec -it "${POD}" -- iperf3 -c iperf3-server -T "Client on ${HOST}" "$@"
+    echo
+done
+
+echo "Now all clients flood the server at the same time..."
+
+for POD in ${CLIENTS}; do
+    echo "[Run] iperf-client pod ${POD}"
+    kubectl exec -it "${POD}" -- iperf3 -c iperf3-server "$@" &> /dev/null &
+done
+
+until [[ $(jobs | grep -v Running) != "" ]]; do
+    printf "."
+    sleep 2
+done
+printf " done\n"
+
+## </run>
+## <clean>
+
+kubectl delete --cascade -f iperf3.yaml
+
+## </clean>

iperf3.yaml

@@ -5,7 +5,7 @@ metadata:
   labels:
     app: iperf3-server
 spec:
-  replicas: 1
+  replicas: 10
   selector:
     matchLabels:
       app: iperf3-server