initial commit

.gitignore

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+yamls/**

README.md

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+# Test heavy load on cluster
+
+Log in cluster.
+
+## nodes configuration
+oc label node worker-0 wkloadtype=fakeload
+oc adm taint node worker-0 wkloadtype=fakeload:NoSchedule
+
+## Deploy workload
+
+~~~
+deploy_wkload.sh {number of deployment} [-d]
+~~~

app_template.yaml

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+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  labels:
+    app.kubernetes.io/part-of: fakeworkload
+  name: ${current_ns}
+
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: fakeworkload
+  namespace: ${current_ns}
+  labels: &deploy_labels
+    app.kubernetes.io/part-of: fakeworkload
+    app.kubernetes.io/name: ${current_ns}
+spec:
+  replicas: 2
+  revisionHistoryLimit: 2
+  progressDeadlineSeconds: 2000
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 25%
+      maxSurge: 25%
+  selector:
+    matchLabels: *deploy_labels
+  template:
+    metadata:
+      creationTimestamp: null
+      labels: *deploy_labels
+    spec:
+      securityContext:
+        runAsNonRoot: true
+        seccompProfile:
+          type: RuntimeDefault
+      affinity:
+        nodeAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            nodeSelectorTerms:
+            - matchExpressions:
+              - key: wkloadtype
+                operator: In
+                values:
+                - fakeload
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchExpressions:
+                - key: app.kubernetes.io/name
+                  operator: In
+                  values:
+                  - ${current_ns}
+              topologyKey: kubernetes.io/hostname
+      tolerations:
+      - key: wkloadtype
+        operator: Equal
+        value: fakeload
+        effect: "NoSchedule"  
+      containers:
+      - image: quay.io/simbelmas/nginx:stable
+        resources:
+          requests:
+            memory: "1Mi"
+            cpu: "1m"
+          limits:
+            memory: "20Mi"
+        command:
+        - bash
+        - -e
+        - -c
+        - |-
+          lc() 
+          {
+            (
+              pids=""
+              cpus=\${1:-1}
+              seconds=\${2:-60}
+              echo loading \$cpus CPUs for \$seconds seconds
+              trap 'for p in \$pids; do kill \$p; done' 0
+              for ((i=0;i<cpus;i++)); do
+                while : ; do
+                 : 
+                done & 
+                pids="\$pids $!"
+              done
+              sleep \$seconds
+            ) &
+          }
+          #lc \$((1 + \$RANDOM % 3)) \$((120 + \$RANDOM % 421))
+          lc \$((1 + \$RANDOM % 3)) \$((120 + \$RANDOM % 600))
+          wait
+          echo Starting frontend
+          exec nginx -g "daemon off;"
+        imagePullPolicy: IfNotPresent
+        securityContext:
+          allowPrivilegeEscalation: false
+          capabilities:
+            drop: ['ALL']
+        name: front
+        volumeMounts:
+        - mountPath: /var/www/html
+          name: web
+        ports:
+        - containerPort: 8080
+          protocol: TCP
+        readinessProbe:
+          httpGet:
+            path: /
+            port: 8080
+          initialDelaySeconds: 10
+          timeoutSeconds: 1
+          periodSeconds: 20
+          successThreshold: 1
+          failureThreshold: 3
+        livenessProbe:
+          httpGet:
+            path: /
+            port: 8080
+          initialDelaySeconds: 10
+          timeoutSeconds: 1
+          periodSeconds: 30
+          successThreshold: 1
+          failureThreshold: 3
+        startupProbe:
+          httpGet:
+            path: /
+            port: 8080
+          periodSeconds: 10
+          successThreshold: 1
+          failureThreshold: 90
+      initContainers:
+      - command:
+        - bash
+        - -e
+        - -c
+        - |-
+          cat >/var/www/index.html <<EOF
+          <html>
+          <head><title>${current_ns}</title>
+          <body>
+            <h1>${current_ns}</h1>
+          </body>
+          </html>
+          EOF
+        image: quay.io/simbelmas/nginx:stable
+        imagePullPolicy: IfNotPresent
+        securityContext:
+          allowPrivilegeEscalation: false
+          capabilities:
+            drop: ['ALL']
+        name: generate-web
+        volumeMounts:
+        - mountPath: /var/www
+          name: web
+      volumes:
+      - emptyDir: {}
+        name: web
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels: &svc_labels
+    app.kubernetes.io/part-of: fakeworkload
+    app.kubernetes.io/name: ${current_ns}
+  name: fakeworkload-${current_ns}
+  namespace: ${current_ns}
+spec:
+  ports:
+  - name: http
+    port: 80
+    protocol: TCP
+    targetPort: 8080
+  selector: *svc_labels
+  sessionAffinity: ClientIP
+  type: ClusterIP
+
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: fakeworkload-${current_ns}
+  namespace: ${current_ns}
+  labels:
+    app.kubernetes.io/part-of: fakeworkload
+    app.kubernetes.io/name: ${current_ns}
+spec:
+  ingressClassName: openshift-default
+  rules:
+  - host: ${current_ns}.${route_domain}
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: fakeworkload-${current_ns}
+            port:
+              number: 80
+

deploy_wkload.sh

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+#!/bin/zsh -e
+script_dir="$(dirname "$(readlink -f "$0")")"
+manifests_dir=${script_dir}/yamls
+
+
+ns_prefix=wkload-
+
+if [[ "$1" =~ '^[0-9]+$' ]] ; then 
+    nb_ns="$1"
+else
+    echo First paramater nor given or not number, assuming 1 >&2
+    nb_ns=1
+fi
+
+# Namesspaces Cleanup
+if [[ "$2" == "-d" ]] ; then
+    oc delete --wait ns -l app.kubernetes.io/part-of=fakeworkload || echo No namespace to delete continuing
+fi
+
+# yamls Cleanup
+if [ -d "${manifests_dir}" ] ; then
+    rm -rf "${manifests_dir}"
+fi
+
+## Generate yamls
+echo Template generation ....
+mkdir "${manifests_dir}"
+route_domain="$(oc get ingresses.config.openshift.io cluster -o jsonpath='{.spec.domain}')"
+start=1
+while [[ "${start}" -le "${nb_ns}"  ]] ; do
+    current_ns=${ns_prefix}$(printf "%05d" "${start}")
+    start=$((start + 1))
+    eval "cat >${manifests_dir}/${current_ns}.yaml <<EOF
+$(<${script_dir}/app_template.yaml)
+EOF"
+done
+
+oc apply -f "${manifests_dir}"
+echo All Done!

kubelet-500-pods-per-node.yaml

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+apiVersion: machineconfiguration.openshift.io/v1
+kind: KubeletConfig
+metadata:
+  name: set-max-pods 
+spec:
+  machineConfigPoolSelector:
+    matchLabels:
+      pools.operator.machineconfiguration.openshift.io/worker: "" 
+  kubeletConfig:
+    podsPerCore: 0
+    maxPods: 500