# What ${source\_elasticsearch} is in Elasticsearch docker file

**URL:** <https://discuss.elastic.co/t/what-source-elasticsearch-is-in-elasticsearch-docker-file/185707>\
**Category:** Elasticsearch\
**Created:** [June 13, 2019, 5:13pm UTC](https://discuss.elastic.co/t/what-source-elasticsearch-is-in-elasticsearch-docker-file/185707 "2019-06-13T17:13:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![riverbuilding](https://avatars.discourse-cdn.com/v4/letter/r/b3f665/32.png) [@riverbuilding](https://discuss.elastic.co/u/riverbuilding)\
**Post date:** [June 13, 2019, 5:13pm UTC](https://discuss.elastic.co/t/what-source-elasticsearch-is-in-elasticsearch-docker-file/185707/1 "2019-06-13T17:13:45Z")

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in Elasticsearch docker file: [https://github.com/elastic/elasticsearch/blob/7.1/distribution/docker/src/docker/Dockerfile](https://github.com/elastic/elasticsearch/blob/7.1/distribution/docker/src/docker/Dockerfile)

I found line 25: ${source\_elasticsearch} what is this in docker file? why need this ? how does it used and worked?

in line 27: RUN tar zxf /opt/{elasticsearch} where is {elasticsearch} defined?

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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:** [July 11, 2019, 5:13pm UTC](https://discuss.elastic.co/t/what-source-elasticsearch-is-in-elasticsearch-docker-file/185707/2 "2019-07-11T17:13:50Z")

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