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Sample springboot convention webserver

The image contains a simple Go webserver server.go, that will by default, listens on port 9000 and expose a service at /.

The webserver can only be called with request body of type PodConventionContext of APIGroup webhooks.conventions.carto.run. If not, server responds with 400 status code. When called with correct request body type, the server emits a response of object type PodConventionContext of APIGroup webhooks.conventions.carto.run. This spring sample webserver adds annotation boot.spring.io/version with value {spring-boot-version} and add label conventions.carto.run/framework with value spring-boot if the container image has spring-boot dependency.

Trying out

Build and run the convention server:

# either, from source:
ko apply -f server.yaml

# or, from a release distribution:
kubectl create -f <(kbld -f server.yaml -f ../.imgpkg/images.yml)

To verify the setup, add an Workload and check the status

kubectl create -f workload.yaml
kubectl get podintents.conventions.carto.run spring-sample -oyaml

If everything works correctly, the status will contain a transformed template that includes Spring Boot variables added by the convention server.

apiVersion: conventions.carto.run/v1alpha1
kind: PodIntent
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"conventions.carto.run/v1alpha1","kind":"PodIntent","metadata":{"annotations":{},"name":"spring-sample","namespace":"test"},"spec":{"template":{"spec":{"containers":[{"image":"krashed843/tanzu-java-app@sha256:9f90358e4c4eff2255bab81e3fa6316418ef435465dbae3bba74a2262f7c227d","name":"workload"}]}}}}
  creationTimestamp: "2023-12-21T20:40:59Z"
  generation: 1
  name: spring-sample
  namespace: test
  resourceVersion: "7568605"
  uid: 3c263b9c-a586-4933-97a8-604a1badeccb
spec:
  serviceAccountName: default
  template:
    metadata: {}
    spec:
      containers:
      - image: krashed843/tanzu-java-app@sha256:9f90358e4c4eff2255bab81e3fa6316418ef435465dbae3bba74a2262f7c227d
        name: workload
        resources: {}
status:
  conditions:
  - lastTransitionTime: "2023-12-21T20:40:59Z"
    message: ""
    reason: Applied
    status: "True"
    type: ConventionsApplied
  - lastTransitionTime: "2023-12-21T20:40:59Z"
    message: ""
    reason: ConventionsApplied
    status: "True"
    type: Ready
  observedGeneration: 1
  template:
    metadata:
      annotations:
        boot.spring.io/actuator: http://:8080/actuator
        boot.spring.io/version: 2.7.15
        conventions.carto.run/applied-conventions: |-
          spring-sample/spring-boot
          spring-sample/spring-boot-web
          spring-sample/spring-boot-actuator
          spring-sample/spring-boot-actuator-probes
      labels:
        conventions.carto.run/framework: spring-boot
    spec:
      containers:
      - env:
        - name: JAVA_TOOL_OPTIONS
          value: -Dmanagement.endpoints.web.base-path=/actuator -Dmanagement.health.probes.enabled=true
            -Dmanagement.server.port=8080 -Dserver.port=8080
        image: index.docker.io/krashed843/tanzu-java-app@sha256:9f90358e4c4eff2255bab81e3fa6316418ef435465dbae3bba74a2262f7c227d
        livenessProbe:
          httpGet:
            path: /actuator/health/liveness
            port: 8080
            scheme: HTTP
        name: workload
        ports:
        - containerPort: 8080
          protocol: TCP
        readinessProbe:
          httpGet:
            path: /actuator/health/readiness
            port: 8080
            scheme: HTTP
        resources: {}
        startupProbe:
          failureThreshold: 120
          httpGet:
            path: /actuator/health/liveness
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 1
          periodSeconds: 1