# Logstash docker fails to connect to Elasticsearch-docker

**URL:** <https://discuss.elastic.co/t/logstash-docker-fails-to-connect-to-elasticsearch-docker/172977>\
**Category:** Logstash\
**Created:** [March 19, 2019, 1:27pm UTC](https://discuss.elastic.co/t/logstash-docker-fails-to-connect-to-elasticsearch-docker/172977 "2019-03-19T13:27:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Sudhanshu\_Garg](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sudhanshu_garg/32/42073_2.png) [@Sudhanshu\_Garg](https://discuss.elastic.co/u/Sudhanshu_Garg)\
**Post date:** [March 19, 2019, 1:27pm UTC](https://discuss.elastic.co/t/logstash-docker-fails-to-connect-to-elasticsearch-docker/172977/1 "2019-03-19T13:27:38Z")

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I am running ELK 6.6.1 docker on my Ubuntu 16.04 host PC. I am trying to run docker for all 4 components - Elasticsearch, logstash, filebeat and kibana.

But logstash docker is not able to connect to elasticsearch docker. It throws following error:  
_[2019-03-11T14:43:56,784][WARN][logstash.outputs.elasticsearch] Attempted to resurrect connection to dead ES instance, but got an error. {:url=\>"[http://localhost:9200/](http://localhost:9200/)", :error\_type=\>LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError, :error=\>"Elasticsearch Unreachable: [[http://localhost:9200/](http://localhost:9200/)][Manticore::SocketException] Connection refused (Connection refused)"}_

I have tried curl for elasticsearch from host and it works.  
But curl from logstash docker instance fails with the following error:  
_sh-4.2$ curl [http://localhost:9200](http://localhost:9200)_  
_curl: (7) Failed to connect to ::1: Cannot assign requested address_  
_sh-4.2$_

IPv6 is diabled on ubuntu box. My logstash config is quite simple and output looks like following :

_output {_

- elasticsearch {\*
- hosts =\> ["[http://localhost:9200](http://localhost:9200)"]\*
- }\*
- stdout {\*
- codec =\> rubydebug\*
- }\*  
_}_

I have done the port mapping with host as well i.e. used -p 9200:9200 etc while running docker.

Just FYI. I tried direct instances of all 4 components (without docker) on my host machine and it worked perfectly fine.

Can you please suggest what could be the possible issue in docker configuration here.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [April 16, 2019, 1:35pm UTC](https://discuss.elastic.co/t/logstash-docker-fails-to-connect-to-elasticsearch-docker/172977/2 "2019-04-16T13:35:44Z")

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