# Cant start logstash

**URL:** <https://discuss.elastic.co/t/cant-start-logstash/101999>\
**Category:** Logstash\
**Created:** [September 27, 2017, 2:39pm UTC](https://discuss.elastic.co/t/cant-start-logstash/101999 "2017-09-27T14:39:28Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![111126](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/111126/32/36818_2.png) [@111126](https://discuss.elastic.co/u/111126)\
**Post date:** [September 27, 2017, 2:39pm UTC](https://discuss.elastic.co/t/cant-start-logstash/101999/1 "2017-09-27T14:39:28Z")

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`[ERROR][logstash.agent] Cannot create pipeline {:reason=>"Cannot evaluate`${DATA}`. Environment variable`DATA`is not set and there is no default value given."}`  
I dont understand this error and I dont know what is it ${DATA}  
Please help me

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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:** [September 27, 2017, 8:04pm UTC](https://discuss.elastic.co/t/cant-start-logstash/101999/2 "2017-09-27T20:04:11Z")

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How are you starting Logstash?

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**Author:** ![111126](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/111126/32/36818_2.png) [@111126](https://discuss.elastic.co/u/111126)\
**Post date:** [September 28, 2017, 6:32am UTC](https://discuss.elastic.co/t/cant-start-logstash/101999/3 "2017-09-28T06:32:01Z")

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initctl start logstash  
P.S. My OS is CentOS 6

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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:** [September 28, 2017, 7:12am UTC](https://discuss.elastic.co/t/cant-start-logstash/101999/4 "2017-09-28T07:12:47Z")

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What files do you have in /etc/logstash/conf.d and what's the contents of them?

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<div class="post-metadata">

**Author:** ![111126](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/111126/32/36818_2.png) [@111126](https://discuss.elastic.co/u/111126)\
**Post date:** [September 28, 2017, 8:48am UTC](https://discuss.elastic.co/t/cant-start-logstash/101999/5 "2017-09-28T08:48:27Z")

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I have the next config  
[https://pastebin.com/eKza4jBh](https://pastebin.com/eKza4jBh)

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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:** [September 28, 2017, 10:17am UTC](https://discuss.elastic.co/t/cant-start-logstash/101999/6 "2017-09-28T10:17:02Z")

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Hmm, weird. I don't know what's up.

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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:** [October 26, 2017, 10:17am UTC](https://discuss.elastic.co/t/cant-start-logstash/101999/7 "2017-10-26T10:17:09Z")

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Closed on October 26, 2017, 10:17am UTC

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