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.
41 lines
1.9 KiB
Bash
Executable File
41 lines
1.9 KiB
Bash
Executable File
#!/usr/bin/env bash
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# The three custom indicators, and what happens when the upstream goes down.
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set -uo pipefail
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cd "$(dirname "$0")/.."
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OUT=docs/output/07-custom-health-indicators.txt
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B=http://localhost:8080
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{
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echo "### profile: details (show-details: always, show-components: always)"
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echo
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echo "--- upstream UP ---"
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curl -s -o /dev/null -u ops:ops-password -X POST "$B/stub/upstream/mode?value=up"
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sleep 1
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echo "\$ curl -s -o /dev/null -w '%{http_code}' $B/actuator/health"
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curl -s -o /dev/null -w ' HTTP %{http_code}\n' -u ops:ops-password "$B/actuator/health"
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curl -s -u ops:ops-password "$B/actuator/health" | python3 -m json.tool
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echo
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echo "--- flip the upstream to DOWN, change nothing else ---"
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echo "\$ curl -s -X POST '$B/stub/upstream/mode?value=down'"
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curl -s -u ops:ops-password -X POST "$B/stub/upstream/mode?value=down"; echo
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sleep 1
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curl -s -o /dev/null -w ' HTTP %{http_code}\n' -u ops:ops-password "$B/actuator/health"
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curl -s -u ops:ops-password "$B/actuator/health" | python3 -c '
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import json,sys
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d=json.load(sys.stdin)
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print(json.dumps({"status":d["status"],"externalApi":d["components"]["externalApi"]},indent=2))'
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echo
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echo " The aggregate went DOWN and /actuator/health now answers 503. If that URL is your"
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echo " Kubernetes readiness probe, every pod in the deployment has just left the load"
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echo " balancer because a third party had a bad minute."
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echo
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echo "--- a single component, addressed directly ---"
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echo "\$ curl -s $B/actuator/health/ordersDatabase"
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curl -s -u ops:ops-password "$B/actuator/health/ordersDatabase" | python3 -m json.tool
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echo "\$ curl -s $B/actuator/health/kafka"
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curl -s -u ops:ops-password "$B/actuator/health/kafka" | python3 -m json.tool
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echo
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echo "--- restore ---"
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curl -s -u ops:ops-password -X POST "$B/stub/upstream/mode?value=up"; echo
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} > "$OUT" 2>&1
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echo "wrote $OUT"
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