Ankur Mhatre
4b6cefa60a
Companion repository for the ankurm.com article. Every transcript in docs/output/ was produced by running this project; scripts/run-all.sh regenerates all of them. Verified against Spring Boot 4.1.1 / Framework 7.0.9 / Security 7.1.1 / Micrometer 1.17.1 / kafka-clients 4.2.1 on Temurin JDK 25.0.4.1+1.
122 lines
3.1 KiB
Plaintext
122 lines
3.1 KiB
Plaintext
### profile: details (show-details: always, show-components: always)
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--- upstream UP ---
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$ curl -s -o /dev/null -w '%{http_code}' http://localhost:8080/actuator/health
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HTTP 503
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{
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"components": {
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"db": {
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"details": {
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"database": "H2",
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"validationQuery": "isValid()"
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},
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"status": "UP"
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},
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"diskSpace": {
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"details": {
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"total": 10213466112,
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"free": 3877675008,
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"threshold": 10485760,
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"path": "/tmp/work/spring-boot-demo/.",
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"exists": true
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},
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"status": "UP"
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},
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"externalApi": {
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"details": {
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"url": "http://localhost:8080/stub/upstream/ping",
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"response": "pong",
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"latencyMs": 66,
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"timeoutMs": 750
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},
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"status": "UP"
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},
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"kafka": {
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"details": {
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"bootstrap": "localhost:9092",
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"tuned": true,
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"error": "TimeoutException: null",
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"probeMs": 1500,
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"budgetMs": 1500
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},
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"status": "DOWN"
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},
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"livenessState": {
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"status": "UP"
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},
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"ordersDatabase": {
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"details": {
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"orders": 3,
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"queryMs": 0,
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"slowThresholdMs": 250
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},
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"status": "UP"
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},
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"ping": {
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"status": "UP"
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},
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"readinessState": {
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"status": "UP"
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},
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"ssl": {
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"details": {
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"expiringChains": [],
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"invalidChains": [],
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"validChains": []
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},
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"status": "UP"
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}
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},
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"groups": [
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"liveness",
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"readiness"
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],
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"status": "DOWN"
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}
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--- flip the upstream to DOWN, change nothing else ---
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$ curl -s -X POST 'http://localhost:8080/stub/upstream/mode?value=down'
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upstream mode = DOWN
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HTTP 503
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{
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"status": "DOWN",
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"externalApi": {
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"details": {
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"error": "org.springframework.web.client.HttpServerErrorException$ServiceUnavailable: 503 : \"upstream unavailable\"",
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"url": "http://localhost:8080/stub/upstream/ping",
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"latencyMs": 67,
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"timeoutMs": 750
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},
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"status": "DOWN"
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}
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}
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The aggregate went DOWN and /actuator/health now answers 503. If that URL is your
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Kubernetes readiness probe, every pod in the deployment has just left the load
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balancer because a third party had a bad minute.
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--- a single component, addressed directly ---
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$ curl -s http://localhost:8080/actuator/health/ordersDatabase
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{
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"details": {
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"orders": 3,
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"queryMs": 0,
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"slowThresholdMs": 250
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},
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"status": "UP"
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}
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$ curl -s http://localhost:8080/actuator/health/kafka
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{
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"details": {
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"bootstrap": "localhost:9092",
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"tuned": true,
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"error": "TimeoutException: null",
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"probeMs": 1500,
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"budgetMs": 1500
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},
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"status": "DOWN"
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}
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--- restore ---
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upstream mode = UP
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