Setup Elastic APM with elasticsearch operator and test

Continue from the previous article, this one we will talk about how to install the APM server and setup sample application for test.
For the step of install via elasticsearch-operator, please check the post here. Step-by-step installation guide.

Before we start, need to check the CRD to make sure it is there.

command: kubectl get crd -n elasticsearch
NAME                                           CREATED AT
apmservers.apm.k8s.elastic.co                  2020-02-18T03:47:42Z
elasticsearches.elasticsearch.k8s.elastic.co   2020-02-18T03:47:42Z
eniconfigs.crd.k8s.amazonaws.com               2019-12-24T12:55:36Z
kibanas.kibana.k8s.elastic.co                  2020-02-18T03:47:42Z

Then, create an APM YAML file

### elastic-apm.yaml
apiVersion: apm.k8s.elastic.co/v1
kind: ApmServer
metadata:
  name: elastic-apm
  namespace: elasticsearch
spec:
  version: 7.6.0
  count: 1
  hostNetwork: true
  http:
    tls:  ### for make it easy to test, let's disable tls for now
      selfSignedCertificate:
        disabled: true 
  config:
    name: elastic-apm
    apm-server:
      jaeger.grpc.enabled: true
      jaeger.http.enabled: true
      rum.enabled: true
      rum.event_rate.limit: 300
      rum.event_rate.lru_size: 1000
      rum.allow_origins: ['']
      rum.library_pattern: "node_modules|bower_components|~"
      rum.exclude_from_grouping: "^/webpack"
      rum.source_mapping.enabled: true
      rum.source_mapping.cache.expiration: 5m
      rum.source_mapping.index_pattern: "apm--sourcemap*"
  elasticsearchRef:
    name: "elastic-operator"

Apply the elastic-apm.yaml file and Monitor APM Server deployment.

kubectl apply -f ./elastic-apm.yaml
apmserver.apm.k8s.elastic.co/elastic-apm created
kubectl get apmservers -n elasticsearch
NAME          HEALTH   NODES   VERSION   AGE
elastic-apm   green    1       7.6.0     176m

Now, that deploys a sample-application for test APM
In this case, I will be using the application with elastic APM java agent

###sample-application.yaml
### kubectl apply -f sample-application.yaml
---
apiVersion: apps/v1 
kind: Deployment 
metadata: 
  name: petclinic 
  namespace: elasticsearch 
  labels: 
    app: petclinic 
    service: petclinic 
spec: 
  replicas: 1 
  selector: 
    matchLabels: 
      app: petclinic 
  template: 
    metadata: 
      labels: 
        app: petclinic 
        service: petclinic 
    spec: 
      dnsPolicy: ClusterFirstWithHostNet 
      ###################### Shared volume and init container ##########################
      volumes: 
      - name: elastic-apm-agent 
        emptyDir: {} 
      initContainers: 
      - name: elastic-java-agent 
        image: docker.elastic.co/observability/apm-agent-java:1.12.0 
        volumeMounts: 
        - mountPath: /elastic/apm/agent 
          name: elastic-apm-agent 
        command: ['cp', '-v', '/usr/agent/elastic-apm-agent.jar', '/elastic/apm/agent']
      ##################################################################################      
      containers: 
      - name: petclinic 
        image: eyalkoren/pet-clinic:without-agent
      ######################### Volume path and agent config ###########################
        volumeMounts: 
        - mountPath: /elastic/apm/agent 
          name: elastic-apm-agent 
        env: 
        - name: ELASTIC_APM_SERVER_URL 
          value: "http://elastic-apm-apm-http.elasticsearch.svc.cluster.local:8200" 
        - name: ELASTIC_APM_SERVICE_NAME 
          value: "petclinic" 
        - name: ELASTIC_APM_APPLICATION_PACKAGES 
          value: "org.springframework.samples.petclinic" 
        - name: ELASTIC_APM_ENVIRONMENT 
          value: test 
        - name: ELASTIC_APM_LOG_LEVEL 
          value: DEBUG 
        - name: ELASTIC_APM_SECRET_TOKEN 
          valueFrom: 
            secretKeyRef: 
              name: elastic-apm-apm-token 
              key: secret-token 
        - name: JAVA_TOOL_OPTIONS 
          value: -javaagent:/elastic/apm/agent/elastic-apm-agent.jar
---
apiVersion: v1 
kind: Service 
metadata: 
  name: petclinic 
  namespace: elasticsearch 
  labels: 
    app: petclinic 
spec: 
  type: NodePort 
  ports: 
  - protocol: TCP 
    port: 8080 
    targetPort: 8080 
    nodePort: 30001 
  selector: 
    service: petclinic

After creating the application, try to open the page to click on any pages to generate fake data.

kubectl port-forward svc/petclinic -n elasticsearch 8080:8080

Front page

Error test

Finally, get everything done. Now we can go look at the APM dashboard

APM view

For more details for the test application, please check the link

That’s it for now. Will see you next time