Add script to find the limit for openshift.

May be used as an example for other platforms.

Signed-off-by: Nadia Pinaeva <npinaeva@redhat.com>

kube-burner-workload/openshift/README.md

@@ -14,6 +14,11 @@
 `kube-burner init -m ./openshift/metrics.yml -c ./network-policy.yaml -u https://$(oc get route prometheus-k8s -n openshift-monitoring -o jsonpath="{.spec.host}") --log-level=debug --token=$(oc create token prometheus-k8s -n openshift-monitoring)`
 8. When the test finishes, metrics should be collected by the ES_SERVER
 
+## Finding the limit
+
+To automate finding the limit, [test_limit.sh](./test_limit.sh) script may be used.
+It can run multiple iterations increasing the number of network policies until test fails.
+It waits for full cleanup after every iteration to ensure the cluster is ready for the next one.
 
 ## Metrics and Dashboards
 

kube-burner-workload/openshift/test_limit.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+
+wait_cleanup () {
+  POD_NAMES=$(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-node -o jsonpath='{.items[*].metadata.name}')
+  FLOW_COUNT=0
+  for POD_NAME in ${POD_NAMES[@]}; do
+    POD_FLOW_COUNT=$(oc exec -n openshift-ovn-kubernetes $POD_NAME -c ovn-controller -- curl -s "127.0.0.1:29105/metrics"|grep ovs_vswitchd_bridge_flows_total|grep br-int|rev|cut -f1 -d' '|rev)
+    if [ $POD_FLOW_COUNT -gt $FLOW_COUNT ]; then
+      FLOW_COUNT=$POD_FLOW_COUNT
+    fi
+  done
+  echo $FLOW_COUNT
+
+  while [ $FLOW_COUNT -ge 10000 ]; do
+    FLOW_COUNT=0
+    for POD_NAME in ${POD_NAMES[@]}; do
+      POD_FLOW_COUNT=$(oc exec -n openshift-ovn-kubernetes $POD_NAME -c ovn-controller -- curl -s "127.0.0.1:29105/metrics"|grep ovs_vswitchd_bridge_flows_total|grep br-int|rev|cut -f1 -d' '|rev)
+      if [ $POD_FLOW_COUNT -gt $FLOW_COUNT ]; then
+        FLOW_COUNT=$POD_FLOW_COUNT
+      fi
+    done
+    echo $FLOW_COUNT
+    sleep 60
+  done
+  echo "shutdown succeeded"
+}
+
+PLATFORM=openshift
+source ./env
+NETPOLS_PER_NAMESPACE=50
+STEP=50
+expectedStatus=0
+status=$expectedStatus
+while [ $status -eq $expectedStatus ]; do
+  echo $NETPOLS_PER_NAMESPACE
+  wait_cleanup
+  kube-burner init -m ./metrics.yml -c ../network-policy.yaml -u https://$(oc get route prometheus-k8s -n openshift-monitoring -o jsonpath="{.spec.host}") --token=$(oc create token prometheus-k8s -n openshift-monitoring)
+  status=$?
+  if [ $STEP -eq 0 ]; then
+    echo "One iteration is finished"
+    exit 0
+  fi
+  NETPOLS_PER_NAMESPACE=$((NETPOLS_PER_NAMESPACE + STEP))
+done