# Few questions around ELK Stack

**URL:** <https://discuss.elastic.co/t/few-questions-around-elk-stack/133570>\
**Category:** Elasticsearch\
**Created:** [May 28, 2018, 4:10pm UTC](https://discuss.elastic.co/t/few-questions-around-elk-stack/133570 "2018-05-28T16:10:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![abhat](https://avatars.discourse-cdn.com/v4/letter/a/8e8cbc/32.png) [@abhat](https://discuss.elastic.co/u/abhat)\
**Post date:** [May 28, 2018, 4:10pm UTC](https://discuss.elastic.co/t/few-questions-around-elk-stack/133570/1 "2018-05-28T16:10:49Z")

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Hi Team,

Can you please help me answer below questions -

1. what is the use of [elastic.co](http://elastic.co) key (rpm --import [https://artifacts.elastic.co/GPG-KEY-elasticsearch](https://artifacts.elastic.co/GPG-KEY-elasticsearch))

2. what does **bootstrap.memory\_lock: true** (elasticsearch.yml) , **LimitMEMLOCK=infinity** (elasticsearch.service) and **MAX\_LOCKED\_MEMORY=unlimited** (vim /etc/sysconfig/elasticsearch) signify.

3. Use of Nginx and httpd-tools package (yum -y install nginx httpd-tools).

Kind Regards,  
Asif Bhat

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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:** [May 28, 2018, 8:34pm UTC](https://discuss.elastic.co/t/few-questions-around-elk-stack/133570/2 "2018-05-28T20:34:49Z")

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1. For installing DEB/RPM packages and knowing they are the offical ones.
2. Take a look at [https://www.elastic.co/guide/en/elasticsearch/reference/current/system-config.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/system-config.html)
3. That's not a question 😉

Also, check out [http://elastic.co/elk-stack](http://elastic.co/elk-stack)! 😃

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<div class="post-metadata">

**Author:** ![abhat](https://avatars.discourse-cdn.com/v4/letter/a/8e8cbc/32.png) [@abhat](https://discuss.elastic.co/u/abhat)\
**Post date:** [May 28, 2018, 10:24pm UTC](https://discuss.elastic.co/t/few-questions-around-elk-stack/133570/3 "2018-05-28T22:24:54Z")

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Thanks a lot

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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:** [June 25, 2018, 10:24pm UTC](https://discuss.elastic.co/t/few-questions-around-elk-stack/133570/4 "2018-06-25T22:24:57Z")

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Closed on June 25, 2018, 10:24pm UTC

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