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.
37 lines
1.5 KiB
Bash
Executable File
37 lines
1.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Health groups: keeping a dependency outage out of the liveness probe.
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set -uo pipefail
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cd "$(dirname "$0")/.."
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OUT=docs/output/08-groups-and-probes.txt
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B=http://localhost:8080/actuator/health
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{
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echo "### profile: groups"
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echo
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echo "--- baseline: upstream UP ---"
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for g in "" liveness readiness startup; do
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u="$B${g:+/$g}"
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printf ' %-40s HTTP %s\n' "GET ${u#http://localhost:8080}" "$(curl -s -o /dev/null -w '%{http_code}' -u ops:ops-password "$u")"
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done
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echo
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echo "--- upstream DOWN (a third party is having an outage) ---"
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curl -s -o /dev/null -u ops:ops-password -X POST "http://localhost:8080/stub/upstream/mode?value=down"
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sleep 1
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for g in "" liveness readiness startup; do
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u="$B${g:+/$g}"
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printf ' %-40s HTTP %s\n' "GET ${u#http://localhost:8080}" "$(curl -s -o /dev/null -w '%{http_code}' -u ops:ops-password "$u")"
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done
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echo
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echo " liveness stayed 200. readiness went 503."
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echo " Kubernetes takes this instance out of the Service and leaves the process alone."
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echo " Wire readiness to /actuator/health and you get a restart loop instead."
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echo
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echo "--- what each group contains ---"
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echo "\$ curl -s $B/liveness"
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curl -s -u ops:ops-password "$B/liveness" | python3 -m json.tool
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echo "\$ curl -s $B/readiness"
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curl -s -u ops:ops-password "$B/readiness" | python3 -m json.tool
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echo
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curl -s -o /dev/null -u ops:ops-password -X POST "http://localhost:8080/stub/upstream/mode?value=up"
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} > "$OUT" 2>&1
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echo "wrote $OUT"
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