dosubot[bot] commented on issue #3103:
URL: https://github.com/apache/hugegraph/issues/3103#issuecomment-5041148126

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   @neoblackcap The Docker health check hits `curl 
http://localhost:8080/versions` 
[[1]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/docker/docker-compose.yml#L98-L103),
 so "unhealthy" means that endpoint stopped responding. A few things to check:
   
   **Accessing logs** — `docker logs` only shows console (stdout) output. 
HugeGraph writes its main logs to files inside the container at 
`/hugegraph-server/logs/`. To read them:
   
   ```bash
   # check the server log directly
   docker exec <container> cat /hugegraph-server/logs/hugegraph-server.log
   
   # or tail it
   docker exec <container> tail -500 /hugegraph-server/logs/hugegraph-server.log
   ```
   
   You can also mount the logs directory to the host for easier access: `-v 
/host/path:/hugegraph-server/logs` 
[[2]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-dist/src/assembly/static/conf/log4j2.xml).
   
   **Enabling verbose logging** — The logging config is at 
`/hugegraph-server/conf/log4j2.xml` 
[[3]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/Dockerfile#L33).
 You can mount a custom version and change the root logger level from `INFO` to 
`DEBUG` to get more detail 
[[4]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-dist/src/assembly/static/conf/log4j2.xml#L105-L142).
   
   **Common causes of unhealthy after long running** — With small data (100k 
edges) and 8GB RAM, memory exhaustion is less likely, but there are known 
scenarios where accumulated task results or stuck tasks prevent GC from 
reclaiming memory, eventually making the server unresponsive 
[[5]](https://github.com/apache/hugegraph/issues/3057#issuecomment-4659527047) 
[[6]](https://github.com/apache/hugegraph/issues/3059#issuecomment-4679851161). 
Also, there is a [reported HStore isolation bug in 
1.7.0](https://github.com/apache/hugegraph/issues/3090) that could cause 
unexpected behavior with HStore backend 
[[7]](https://github.com/apache/hugegraph/issues/3090).
   
   I'd suggest starting by checking the server log file inside the container — 
that should reveal what happened around the time the health check started 
failing.
   
   
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