# Exclude particular domain name in logstash grok filter section

**URL:** <https://discuss.elastic.co/t/exclude-particular-domain-name-in-logstash-grok-filter-section/52851>\
**Category:** Logstash\
**Created:** [June 15, 2016, 10:38am UTC](https://discuss.elastic.co/t/exclude-particular-domain-name-in-logstash-grok-filter-section/52851 "2016-06-15T10:38:55Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![shan](https://avatars.discourse-cdn.com/v4/letter/s/7ab992/32.png) [@shan](https://discuss.elastic.co/u/shan)\
**Post date:** [June 15, 2016, 10:38am UTC](https://discuss.elastic.co/t/exclude-particular-domain-name-in-logstash-grok-filter-section/52851/1 "2016-06-15T10:38:55Z")

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Hi,

I want to exclude the some domain name \*.com in my messages while storing into elasticsearch.

How to mention in grok filter section ?

Thanks,

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**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:** [June 15, 2016, 10:08pm UTC](https://discuss.elastic.co/t/exclude-particular-domain-name-in-logstash-grok-filter-section/52851/2 "2016-06-15T22:08:42Z")

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You don't do it in grok, you should grok the message and then drop it - [https://www.elastic.co/guide/en/logstash/current/plugins-filters-drop.html](https://www.elastic.co/guide/en/logstash/current/plugins-filters-drop.html) - using a conditional.

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**Author:** ![shan](https://avatars.discourse-cdn.com/v4/letter/s/7ab992/32.png) [@shan](https://discuss.elastic.co/u/shan)\
**Post date:** [June 16, 2016, 10:47am UTC](https://discuss.elastic.co/t/exclude-particular-domain-name-in-logstash-grok-filter-section/52851/3 "2016-06-16T10:47:07Z")

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Hi,

I have tried like this below but its not work for me.

if [hostname] == "domain name" {  
drop { }  
}

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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:** [June 20, 2016, 5:44am UTC](https://discuss.elastic.co/t/exclude-particular-domain-name-in-logstash-grok-filter-section/52851/4 "2016-06-20T05:44:12Z")

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Without knowing what the `hostname` field actually looks like we can't tell what's wrong.

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<div class="post-metadata">

**Author:** ![shan](https://avatars.discourse-cdn.com/v4/letter/s/7ab992/32.png) [@shan](https://discuss.elastic.co/u/shan)\
**Post date:** [June 22, 2016, 8:31am UTC](https://discuss.elastic.co/t/exclude-particular-domain-name-in-logstash-grok-filter-section/52851/5 "2016-06-22T08:31:01Z")

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Hi,

The hostname field actually looks like \*.abc.com

Thanks

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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:** [June 22, 2016, 11:55am UTC](https://discuss.elastic.co/t/exclude-particular-domain-name-in-logstash-grok-filter-section/52851/6 "2016-06-22T11:55:29Z")

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It's _literally_ "\*.abc.com" or a string that ends with ".abc.com", like "[some-random-hostname.abc.com](http://some-random-hostname.abc.com)"? In the latter case use a regexp match conditional:

```nohighlight
if [hostname] =~ /\.abc\.com$/ {
  drop { }
}

```

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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:** [July 6, 2017, 4:51am UTC](https://discuss.elastic.co/t/exclude-particular-domain-name-in-logstash-grok-filter-section/52851/7 "2017-07-06T04:51:14Z")

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