# Optional parameters in elasticsearch.yml **URL:** \ **Category:** Elasticsearch\ **Created:** [October 16, 2014, 7:50pm UTC](https://discuss.elastic.co/t/optional-parameters-in-elasticsearch-yml/20295 "2014-10-16T19:50:17Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![mhughes](https://avatars.discourse-cdn.com/v4/letter/m/85e7bf/32.png) [@mhughes](https://discuss.elastic.co/u/mhughes)\ **Post date:** [October 16, 2014, 7:50pm UTC](https://discuss.elastic.co/t/optional-parameters-in-elasticsearch-yml/20295/1 "2014-10-16T19:50:17Z")
I have parameterized my elasticsearch.yml file like so: node.name: ${NODE\_NAME} This let's me pass in NODE\_NAME as an environment variable when running ES. I was _hoping_ that if NODE\_NAME was undefined, ES would fall back to the default of picking a dynamic name, but it just dies. Is there any way to specify an _optional_ syntax for env variables? -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/e2c1ae6c-0e30-423b-9e11-82a3b2d83bd2%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/e2c1ae6c-0e30-423b-9e11-82a3b2d83bd2%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [October 16, 2014, 10:48pm UTC](https://discuss.elastic.co/t/optional-parameters-in-elasticsearch-yml/20295/2 "2014-10-16T22:48:08Z")
You could try using an if statement in your env variable? On 17 October 2014 06:50, Matt Hughes [hughes.matt@gmail.com](mailto:hughes.matt@gmail.com) wrote: > I have parameterized my elasticsearch.yml file like so: > > node.name: ${NODE\_NAME} > > This let's me pass in NODE\_NAME as an environment variable when running > ES. I was _hoping_ that if NODE\_NAME was undefined, ES would fall back to > the default of picking a dynamic name, but it just dies. Is there any way > to specify an _optional_ syntax for env variables? > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/e2c1ae6c-0e30-423b-9e11-82a3b2d83bd2%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/e2c1ae6c-0e30-423b-9e11-82a3b2d83bd2%40googlegroups.com) > [https://groups.google.com/d/msgid/elasticsearch/e2c1ae6c-0e30-423b-9e11-82a3b2d83bd2%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/e2c1ae6c-0e30-423b-9e11-82a3b2d83bd2%40googlegroups.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAF3ZnZmMBRVTnirSWB%3D9XqCnRfBLaRTOEMxiBt-M%2B6Uiqo2ADQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAF3ZnZmMBRVTnirSWB%3D9XqCnRfBLaRTOEMxiBt-M%2B6Uiqo2ADQ%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![mhughes](https://avatars.discourse-cdn.com/v4/letter/m/85e7bf/32.png) [@mhughes](https://discuss.elastic.co/u/mhughes)\ **Post date:** [October 23, 2014, 7:18pm UTC](https://discuss.elastic.co/t/optional-parameters-in-elasticsearch-yml/20295/3 "2014-10-23T19:18:51Z")
Unclear how that would work. Example? On Thursday, October 16, 2014 6:49:13 PM UTC-4, Mark Walkom wrote: > You could try using an if statement in your env variable? > > On 17 October 2014 06:50, Matt Hughes \<[hughe...@gmail.com](mailto:hughe...@gmail.com) \\> > wrote: > > > I have parameterized my elasticsearch.yml file like so: > > > > node.name: ${NODE\_NAME} > > > > This let's me pass in NODE\_NAME as an environment variable when running > > ES. I was _hoping_ that if NODE\_NAME was undefined, ES would fall back to > > the default of picking a dynamic name, but it just dies. Is there any way > > to specify an _optional_ syntax for env variables? > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [elasticsearc...@googlegroups.com](mailto:elasticsearc...@googlegroups.com) \. > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/e2c1ae6c-0e30-423b-9e11-82a3b2d83bd2%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/e2c1ae6c-0e30-423b-9e11-82a3b2d83bd2%40googlegroups.com) > > [https://groups.google.com/d/msgid/elasticsearch/e2c1ae6c-0e30-423b-9e11-82a3b2d83bd2%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/e2c1ae6c-0e30-423b-9e11-82a3b2d83bd2%40googlegroups.com?utm_medium=email&utm_source=footer) > > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/ceaa6957-c26d-4dc6-99f8-6a997aef1d94%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/ceaa6957-c26d-4dc6-99f8-6a997aef1d94%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 12:54am UTC](https://discuss.elastic.co/t/optional-parameters-in-elasticsearch-yml/20295/4 "2017-07-06T00:54:06Z")