├── create_service.sh
├── kubia-qps
    ├── Dockerfile
    └── app.js
├── qps-autoscaler.yaml
├── qps-deployment.yaml
└── run-load-generator.sh


/create_service.sh:
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1 | 
2 | kubectl expose deployment kubia --port=80 --target-port=8080
3 | 
4 | 


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/kubia-qps/Dockerfile:
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1 | FROM node:0.12
2 | ADD app.js /app.js
3 | CMD node app.js
4 | 


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/kubia-qps/app.js:
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 1 | var http = require('http');
 2 | var os = require('os');
 3 | 
 4 | var qps = [];
 5 | 
 6 | const SECONDS = 5;
 7 | 
 8 | var handler = function(request, response) {
 9 |   var now = new Date().getTime();
10 | 
11 |   var total = 0;
12 |   for (var time in qps) {
13 |     if (qps.hasOwnProperty(time)) {
14 |       if (time < now - SECONDS * 1000) {
15 |         qps[time] = null;
16 |       } else {
17 |         total += qps[time];
18 |       }
19 |     }
20 |   }
21 | 
22 |   var avgQps = total / SECONDS;
23 | 
24 |   if (request.url == "/metrics") {
25 |     response.writeHead(200);
26 |     response.end("# TYPE qps gauge\nqps " + avgQps + "\n");
27 |     console.log("Received request for /qps: " + avgQps);
28 |     return;
29 |   }
30 | 
31 |   if (qps[now] == null) {
32 |     qps[now] = 0;
33 |   }
34 |   qps[now]++;
35 | 
36 |   response.writeHead(200);
37 |   response.end("You've hit " + os.hostname() + ". QPS in last " + SECONDS + " seconds has been " + avgQps + "\n");
38 | };
39 | 
40 | var www = http.createServer(handler);
41 | www.listen(8080);
42 | 
43 | 


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/qps-autoscaler.yaml:
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 1 | apiVersion: autoscaling/v1
 2 | kind: HorizontalPodAutoscaler
 3 | metadata:
 4 |   name: kubia
 5 |   annotations:
 6 |     alpha/target.custom-metrics.podautoscaler.kubernetes.io: '{"items":[{"name":"qps", "value": "20"}]}'
 7 | spec:
 8 |   maxReplicas: 5
 9 |   minReplicas: 1
10 |   scaleTargetRef:
11 |     apiVersion: extensions/v1beta1
12 |     kind: Deployment
13 |     name: kubia
14 |   targetCPUUtilizationPercentage: 1000000
15 | 


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/qps-deployment.yaml:
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 1 | apiVersion: extensions/v1beta1
 2 | kind: Deployment
 3 | metadata:
 4 |   name: kubia
 5 | spec:
 6 |   replicas: 1
 7 |   template:
 8 |     metadata:
 9 |       name: kubia
10 |       labels:
11 |         app: kubia
12 |       annotations:
13 |         pod.beta.kubernetes.io/init-containers: '[
14 |             {
15 |                 "name": "setup",
16 |                 "image": "busybox",
17 |                 "imagePullPolicy": "IfNotPresent",
18 |                 "command": ["sh", "-c", "echo \"{\\\"endpoint\\\": \\\"http://$POD_IP:8080/metrics\\\"}\" > /etc/custom-metrics/definition.json"],
19 |                 "env": [{
20 |                   "name": "POD_IP",
21 |                   "valueFrom": {
22 |                     "fieldRef": {
23 |                       "apiVersion": "v1",
24 |                       "fieldPath": "status.podIP"
25 |                     }
26 |                   }
27 |                 }],
28 |                 "volumeMounts": [
29 |                     {
30 |                         "name": "config",
31 |                         "mountPath": "/etc/custom-metrics"
32 |                     }
33 |                 ]
34 |             }
35 |         ]'
36 |     spec:
37 |       containers:
38 |       - image: luksa/kubia:qps
39 |         name: nodejs
40 |         ports:
41 |           - containerPort: 8080
42 |         volumeMounts:
43 |         - name: config
44 |           mountPath: /etc/custom-metrics
45 |         resources:
46 |           requests:
47 |             cpu: 100m
48 |       volumes:
49 |       - name: config
50 |         emptyDir:
51 | 


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/run-load-generator.sh:
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1 | kubectl run -it --rm --restart=Never loadgenerator --image=busybox -- sh -c "while true; do wget -O - -q http://kubia.default; done"
2 | 
3 | 


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