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Kubernetes Spring Stuff

Ray Tsang

GoogleCloud Platform Developer Advocate

@saturnism saturnism.me

spring.io/projects/spring-cloud-gcp gcplab.me/spring

flickr.com/saturnism

Youtube of 4 years ago

AN: This looks like it's a bit more advanced on Kubernetes for me.

Follow app dev best practices: Stateless, etc.

12 Factor App

Test, Test, Test

Local, Wiremock, Contract, Mock, TestContainers

Memory management in containers

Native Memory Tracking enabled in JVM, gives you cool memory stats when shut down successfully (not OOMKilled)

Docker best practices, use them.

Jib plugin for gradle & maven

  • Specify dest image
  • Specify source image
  • Don't run as root, specify nobody:nogroup when possible

Splits your code into good layers: dependencies, properites/config, app code thin jar.

Don't write to the filesystem, especially logs.

Kubernetes

BAD!

$ kubectl create deployment demo-app --image=gcr.io/wise-coyote-827/jib-demo

Not as bad, but still bad.

$ kubectl rollout

build your yaml files, check them in, and deploy via CI/CD

$ kubectl create deployment demo-app --image=gcr.io/wise-coyote-827/jib-demo --dry-run -oyaml

Skaffold

Similar to Docker-Compose for Kubernetes? (I thought Kubernetes was basically Docker-compose for docker?)

Kubernetes has LivenessProbe (SHould I kill the app and restart?) and ReadinessProbe (Should I accept requests for processing?) Those are NOT the same.

Liveness Probe shouldn't be the actuator endpoint

livenessProbe:
  httpGet:
    initialDelaySeconds: 60
    port: 8080
    path: /alive
readinessProbe:
  periodSecionds: ? #
  failureThreshold: ? #
  initialDelaySeconds: ? # 
  httpGet:
    port: 8080
    path: /actuator/health

Graceful Shutdown

  1. Receive SIGTERM
  2. Fail the readiness probe
  3. Receive new requests, until they stop coming in,
  4. Wait for requests to finish
  5. then die.

ch.sbb:spring-boot-graceful-shutdown

static void main(Stringp[] args) {
  GracefulShutdownSpringApplication.run(DemoApplication.class, args)
}

Different environments

  • Helm
  • Custom Templating engines (Jinja/Python)
  • Kustomize

/kustomize/base/deployment.yaml, /kustomize/base/service.yaml /kustomize/base/kustomize.yaml

/kustomize/qa/kustomization.yaml