# Logstash env configuration to set the elastic search url
**URL:** https://discuss.elastic.co/t/logstash-env-configuration-to-set-the-elastic-search-url/250675
**Category:** Logstash
**Tags:** docker
**Created:** [October 1, 2020, 12:33pm UTC](https://discuss.elastic.co/t/logstash-env-configuration-to-set-the-elastic-search-url/250675 "2020-10-01T12:33:49Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@masber](https://discuss.elastic.co/u/masber)
#### Post date: [October 1, 2020, 12:33pm UTC](https://discuss.elastic.co/t/logstash-env-configuration-to-set-the-elastic-search-url/250675/1 "2020-10-01T12:33:49Z")
Hi, I am running logstash docker container and need to know which env to use to tell logstash where to find the elasticsearch server.
`[2020-10-01T11:37:39,829][WARN][logstash.licensechecker.licensereader] Attempted to resurrect connection to dead ES instance, but got an error. {:url=>"http://elasticsearch:9200/", :error_type=>LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError, :error=>"Elasticsearch Unreachable: [http://elasticsearch:9200/][Manticore::ResolutionFailure] elasticsearch: Name or service not known"}`
any thoughts?
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### Author:  [@masber](https://discuss.elastic.co/u/masber)
#### Post date: [October 1, 2020, 2:08pm UTC](https://discuss.elastic.co/t/logstash-env-configuration-to-set-the-elastic-search-url/250675/3 "2020-10-01T14:08:35Z")
I want to change the value [http://elasticsearch:9200](http://elasticsearch:9200) to a different value using an env instead of a configuration file.
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### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [October 1, 2020, 2:24pm UTC](https://discuss.elastic.co/t/logstash-env-configuration-to-set-the-elastic-search-url/250675/5 "2020-10-01T14:24:39Z")
> [@masber](#):
>
> I want to change the value [http://elasticsearch:9200](http://elasticsearch:9200) to a different value using an env instead of a configuration file.
If it were an elasticsearch output then you could [do that](https://www.elastic.co/guide/en/logstash/current/environment-variables.html), but I believe the licence check always uses a value from logstash.yml
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [October 29, 2020, 2:24pm UTC](https://discuss.elastic.co/t/logstash-env-configuration-to-set-the-elastic-search-url/250675/6 "2020-10-29T14:24:54Z")
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