# Elastiflow error message in docker

**URL:** <https://forum.elastiflow.com/t/elastiflow-error-message-in-docker/355>\
**Category:** ElastiFlow Community\
**Created:** [January 12, 2026, 7:36am UTC](https://forum.elastiflow.com/t/elastiflow-error-message-in-docker/355 "2026-01-12T07:36:45Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![nobo73](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.elastiflow.com/nobo73/32/170_2.png) [@nobo73](https://forum.elastiflow.com/u/nobo73)\
**Post date:** [January 12, 2026, 7:36am UTC](https://forum.elastiflow.com/t/elastiflow-error-message-in-docker/355/1 "2026-01-12T07:36:45Z")

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Hi, I am new to Elastiflow.

Now, I’ve just tried to install Elastiflow using docker image on TrueNAS CE 25.10.  
Then, I get this error-log message in docker container.

What do I need to do for fixing it?

`{“level”:“error”,“ts”:“2026-01-12T07:27:51.234Z”,“caller”:“metrics/metrics_documents.go:479”,“msg”:“[metrics]: failed to parse metrics”,“code”:“metrics/parse-error”,“reason”:“reading text format failed: text format parsing error in line 1: invalid metric name”,“stacktrace”:“``github.com/elastiflow/flowcoll/pkg/metrics.parsePrometheusMetrics``\n\t/app/pkg/metrics/metrics_documents.go:479”}`

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**Author:** ![daniel.harada](https://avatars.discourse-cdn.com/v4/letter/d/d6d6ee/32.png) [@daniel.harada](https://forum.elastiflow.com/u/daniel.harada)\
**Post date:** [January 12, 2026, 12:41pm UTC](https://forum.elastiflow.com/t/elastiflow-error-message-in-docker/355/2 "2026-01-12T12:41:52Z")

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This looks like an issue with gathering metrics from the flow collector. I have never seen this error before.

My best guess is that there is some port conflict, like maybe the default 8080 API port ( EF\_API\_PORT: 8080 ) conflicts with something already running/using that port. I’d check the full logs to see if there is some other issue reported before this one.

Regards,

Dexter

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**Author:** ![nobo73](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.elastiflow.com/nobo73/32/170_2.png) [@nobo73](https://forum.elastiflow.com/u/nobo73)\
**Post date:** [January 12, 2026, 3:06pm UTC](https://forum.elastiflow.com/t/elastiflow-error-message-in-docker/355/3 "2026-01-12T15:06:37Z")

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@daniel.harada  
Hi, Thanks for your comment.

Well, I have not configured this docker-compose.yaml. and Default API port was commented out.  
I set Default API Port to the other number, then the error is disappeared now. Great!

But, I can not access to the dashboard yet. I think I need to check my set-up.  
I have just followed docker installation here : [Installation using Docker | ElastiFlow](https://www.elastiflow.com/docs/flowcoll/install_docker/)

Is there any good guide for setting up?

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**Author:** ![daniel.harada](https://avatars.discourse-cdn.com/v4/letter/d/d6d6ee/32.png) [@daniel.harada](https://forum.elastiflow.com/u/daniel.harada)\
**Post date:** [January 21, 2026, 12:30pm UTC](https://forum.elastiflow.com/t/elastiflow-error-message-in-docker/355/4 "2026-01-21T12:30:44Z")

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Do you have Elasticsearch/Kibana installed, or OpenSearch/OpenSearch Dashboards?

We have some example ‘docker compose’ files for Elasticsearch/Kibana at [Single "Lab" Server | ElastiFlow Documentation](https://docs.elastiflow.com/data_platforms/elastic/elasticsearch/cluster_xsmall) if that helps.

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**Author:** ![system](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.elastiflow.com/system/32/59_2.png) [@system](https://forum.elastiflow.com/u/system)\
**Post date:** [February 20, 2026, 12:30pm UTC](https://forum.elastiflow.com/t/elastiflow-error-message-in-docker/355/5 "2026-02-20T12:30:48Z")

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Closed on February 20, 2026, 12:30pm UTC

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