Chaos Testing KubeDB Elasticsearch - #579
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Visit the preview URL for this PR (updated for commit f0a0932): https://blog-v1-hugo--pr579-es-chaos-eng-lotf6q66.web.app (expires Thu, 20 Aug 2026 17:02:16 GMT) 🔥 via Firebase Hosting GitHub Action 🌎 Sign: ddacb919f90a98185619681ef0da6429c962b808 |
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Pull request overview
Adds a new long-form blog post documenting chaos engineering experiments against a KubeDB-managed Elasticsearch cluster using Chaos Mesh, including setup steps, a continuous load generator, 21 failure scenarios, and a results summary to demonstrate shard resilience and failover behavior.
Changes:
- Introduces a full tutorial for deploying an HA Elasticsearch topology via KubeDB and validating behavior under controlled chaos.
- Includes a curl-based continuous index/search load client and verification approach to detect acknowledged-write data loss.
- Summarizes outcomes across 21 experiments with recovery times, health transitions, and key operational takeaways.
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| C="curl -s -k -u ${USER}:${PASS}" | ||
| committed=0; idx_ok=0; idx_fail=0; search_ok=0; search_fail=0 | ||
| start=$(date +%s); last_report=$start | ||
| until $C "${URL}/_cluster/health" | grep -qE '"status":"(green|yellow)"'; do sleep 3; done | ||
| $C -X PUT "${URL}/${INDEX}" -H 'Content-Type: application/json' \ | ||
| -d '{"settings":{"number_of_shards":3,"number_of_replicas":1,"index.write.wait_for_active_shards":"1"}}' >/dev/null | ||
| while [ $(( $(date +%s) - start )) -lt "$DURATION" ]; do | ||
| ts=$(date -u +%FT%TZ); i=$committed; end=$(( committed + BATCH )); : > /tmp/bulk | ||
| while [ $i -lt $end ]; do | ||
| printf '{"index":{"_id":"%s"}}\n{"n":%s,"ts":"%s","pad":"chaos-load-doc"}\n' "$i" "$i" "$ts" >> /tmp/bulk | ||
| i=$(( i + 1 )) | ||
| done | ||
| resp=$($C -X POST "${URL}/${INDEX}/_bulk" -H 'Content-Type: application/x-ndjson' --data-binary @/tmp/bulk) | ||
| if echo "$resp" | grep -q '"errors":false'; then | ||
| committed=$(( committed + BATCH )); idx_ok=$(( idx_ok + 1 )) | ||
| else idx_fail=$(( idx_fail + 1 )); sleep 0.3; fi | ||
| if [ $(( (idx_ok + idx_fail) % 5 )) -eq 0 ]; then | ||
| if $C "${URL}/${INDEX}/_search?size=0&q=*:*" | grep -q '"total"'; then | ||
| search_ok=$(( search_ok + 1 )); else search_fail=$(( search_fail + 1 )); fi | ||
| fi | ||
| now=$(date +%s) |
Signed-off-by: Fazle Rabbi Sarker <fazlerabbi@appscode.com>
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- Quote curl credentials properly in load.sh to avoid breaking on special characters (use a shell function instead of a command string) - Note that dashboard.securityMode=false is dev-only and link to the production installation guide for proper auth setup - Fix minor grammar nits (instructions plural, request new features) Signed-off-by: Tamal Saha <tamal@appscode.com>
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