asmhatreandClaude Opus 5
a065696478
Companion code for "Deploying Spring Boot 4 on Kubernetes: Probes, Graceful Shutdown, Limits and JVM Ergonomics". A dependency outage under three probe-group setups, a rolling restart under load four ways (three runs each), the JVM's ergonomic choices for nine pod shapes, one GC-heavy load under five CPU limits with throttling counters, and an HPA driven by a Micrometer gauge through prometheus-adapter. Measured on k3s v1.36.4. Co-Authored-By: Claude Opus 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01C3TETMrqVUWeFkNtz3Jbo3
34 lines
1013 B
YAML
34 lines
1013 B
YAML
# A trivially small HTTP service the app's "downstream" health indicator calls. Scale it to zero to
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# simulate a dependency outage: kubectl -n demo scale deploy/downstream --replicas=0
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: downstream
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namespace: demo
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spec:
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replicas: 1
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selector:
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matchLabels: {app: downstream}
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template:
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metadata:
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labels: {app: downstream}
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spec:
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# busybox httpd runs as PID 1 and ignores SIGTERM, so without this a scale-to-zero leaves the
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# "outage" serving for the full 30 s grace period.
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terminationGracePeriodSeconds: 2
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containers:
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- name: httpd
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image: busybox:1.37
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imagePullPolicy: Never
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command: ["sh", "-c", "mkdir -p /www && echo ok > /www/index.html && exec httpd -f -p 8080 -h /www"]
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ports: [{containerPort: 8080}]
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: downstream
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namespace: demo
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spec:
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selector: {app: downstream}
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ports: [{port: 8080, targetPort: 8080}]
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