# Logstash Variables

**URL:** <https://discuss.elastic.co/t/logstash-variables/70822>\
**Category:** Logstash\
**Created:** [January 6, 2017, 9:38pm UTC](https://discuss.elastic.co/t/logstash-variables/70822 "2017-01-06T21:38:04Z")\
**Posts on this page:** 6\
**Page:** 2

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**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [January 23, 2017, 6:28am UTC](https://discuss.elastic.co/t/logstash-variables/70822/21 "2017-01-23T06:28:04Z")

</div>

> ```
> add_field => { "pipeline_ingress" => "$node.name" }
> 
> ```

You'd have to make that `${node.name}`, but since `node.name` isn't an environment variable it wouldn't work anyway.

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<div class="post-metadata">

**Author:** ![kopacko](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kopacko/32/10733_2.png) [@kopacko](https://discuss.elastic.co/u/kopacko)\
**Post date:** [January 23, 2017, 3:17pm UTC](https://discuss.elastic.co/t/logstash-variables/70822/22 "2017-01-23T15:17:49Z")

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So how can I build a variable that Logstash "can" read?

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [January 23, 2017, 3:38pm UTC](https://discuss.elastic.co/t/logstash-variables/70822/23 "2017-01-23T15:38:59Z")

</div>

Assuming you're starting Logstash as a service via systemd or SysV init, setting the variables in /etc/default/logstash should work.

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<div class="post-metadata">

**Author:** ![kopacko](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kopacko/32/10733_2.png) [@kopacko](https://discuss.elastic.co/u/kopacko)\
**Post date:** [January 23, 2017, 3:45pm UTC](https://discuss.elastic.co/t/logstash-variables/70822/24 "2017-01-23T15:45:14Z")

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> [@magnusbaeck](#):
>
> ${node.name}

Ok and then reference it, via a Logstash config, like ${variable.name} ?

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [January 23, 2017, 3:45pm UTC](https://discuss.elastic.co/t/logstash-variables/70822/25 "2017-01-23T15:45:59Z")

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Yes.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [February 20, 2017, 3:46pm UTC](https://discuss.elastic.co/t/logstash-variables/70822/26 "2017-02-20T15:46:06Z")

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