Elastic APM Java Agent in Docker - Connection Refused

Elastic Observability APM
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Kibana version: 7.16.3

Elasticsearch version: 7.16.3

APM Server version: 7.16.3

APM Agent language and version: elastic-apm-agent 1.30.0 (java .jar)

I've been trying to use APM Agent to monitor a Springboot application in a docker container but it keeps returning Connection Refused

hello-world_1  | 2022-04-11 15:18:36,522 [main] INFO  co.elastic.apm.agent.impl.ElasticApmTracer - Tracer switched to RUNNING state
hello-world_1  | 2022-04-11 15:18:36,523 [elastic-apm-server-healthcheck] WARN  co.elastic.apm.agent.report.ApmServerHealthChecker - Elastic APM server http://localhost:8200/ is not available (Connection refused)
hello-world_1  | 2022-04-11 15:18:36,529 [elastic-apm-remote-config-poller] ERROR co.elastic.apm.agent.configuration.ApmServerConfigurationSource - Connection refused

PS: If I do a curl localhost:8200 it work just fine.

Here is my Dockerfile:

FROM openjdk:17
ADD target/elastic-apm-agent-1.30.0.jar elastic-apm-agent-1.30.0.jar
ADD target/hello-world-0.1.0.jar hello-world-0.1.0.jar
EXPOSE 8080

CMD java -javaagent:elastic-apm-agent-1.30.0.jar -Delastic.apm.service_name=Teste -Delastic.apm.application_packages=org.example,org.another.example -Delastic.apm.server_url=http://localhost:8200 -jar hello-world-0.1.0.jar

Once the application start these logs come out:

hello-world_1  | 2022-04-11 15:47:21,800 [elastic-apm-server-reporter] ERROR co.elastic.apm.agent.report.IntakeV2ReportingEventHandler - Error trying to connect to APM Server at http://localhost:8200/intake/v2/events. Although not necessarily related to SSL, some related SSL configurations corresponding the current connection are logged at INFO level.
hello-world_1  | 2022-04-11 15:47:21,800 [elastic-apm-server-reporter] ERROR co.elastic.apm.agent.report.IntakeV2ReportingEventHandler - Failed to handle event of type JSON_WRITER with this error: Connection refused
hello-world_1  | 2022-04-11 15:47:21,800 [elastic-apm-server-reporter] INFO  co.elastic.apm.agent.report.IntakeV2ReportingEventHandler - Backing off for 0 seconds (+/-10%)

I'm really newbie to the subject and still learning how to work with it, tried the solutions I found arround people with similar problems here but couldn't make it work...I'll be glad if there is anyone able to help!

2

What happens if you shell into the docker container and curl localhost:8200 from there?

1 Like
3

In order to access your local machine use host.docker.internal instead of localhost .

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It really worked! Thanks alot for the help it was so simple but I would never notice it!

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