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Add KSQL Server Docker healthcheck #22

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merged 3 commits into from
Oct 15, 2019
Merged

Add KSQL Server Docker healthcheck #22

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e9d7ea1
Add KSQL Server Docker healthcheck
Aug 6, 2019
ce0a588
Move curl response into variable
Oct 7, 2019
405389c
Use REST query for better status probe
Oct 7, 2019
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8 changes: 8 additions & 0 deletions cp-ksql-server/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -32,3 +32,11 @@ RUN chmod +x /etc/confluent/docker/launch
RUN chmod +x /etc/confluent/docker/ensure

CMD ["/etc/confluent/docker/run"]

# Polling period : 5 seconds
# Timeout period :10 seconds (if the polling does not return within this time, treat as a failed poll)
# Start-up period :10 minutes (during which failures are not counted as failures)
# Retry period :30 seconds (after which container is deemed unhealthy)
# All settings can be overriden at run-time in Docker/Docker Compose.
HEALTHCHECK --start-period=600s --interval=5s --timeout=10s --retries=6 \
CMD /etc/confluent/docker/healthcheck.sh
10 changes: 10 additions & 0 deletions cp-ksql-server/include/etc/confluent/docker/healthcheck.sh
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@@ -0,0 +1,10 @@
#!/usr/bin/env bash

curl_status=$(curl -X POST -s -o /dev/null -w %{http_code} $KSQL_LISTENERS/ksql -H 'content-type: application/vnd.ksql.v1+json; charset=utf-8' -d '{"ksql":"SHOW TOPICS;"}')
if [ $curl_status -eq 200 ]; then
echo "Woohoo! KSQL is up!"
exit 0
else
echo -e $(date) " KSQL server query response code: " $curl_status " (waiting for 200)"
exit 1
fi