# Discovery.zen.ping.unicast.hosts?

**URL:** <https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts/71290>\
**Category:** Elasticsearch\
**Created:** [January 11, 2017, 11:24pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts/71290 "2017-01-11T23:24:14Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![nanshan](https://avatars.discourse-cdn.com/v4/letter/n/858c86/32.png) [@nanshan](https://discuss.elastic.co/u/nanshan)\
**Post date:** [January 11, 2017, 11:24pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts/71290/1 "2017-01-11T23:24:14Z")

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Hi I am reading the document: [https://www.elastic.co/guide/en/elasticsearch/guide/1.x/\_important\_configuration\_changes.html](https://www.elastic.co/guide/en/elasticsearch/guide/1.x/_important_configuration_changes.html)

At the bottom of the document, it says I should list the three dedicated master as the value of `discovery.zen.ping.unicast.hosts`

Can I add a load balance ELB here?

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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:** [January 11, 2017, 11:29pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts/71290/2 "2017-01-11T23:29:26Z")

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Yes, you can do that.

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**Author:** ![nanshan](https://avatars.discourse-cdn.com/v4/letter/n/858c86/32.png) [@nanshan](https://discuss.elastic.co/u/nanshan)\
**Post date:** [January 11, 2017, 11:34pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts/71290/3 "2017-01-11T23:34:55Z")

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discovery.zen.ping.unicast.hosts: "elb name" or discovery.zen.ping.unicast.hosts: ["elb"] ?

which format should i use?

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<div class="post-metadata">

**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:** [January 11, 2017, 11:39pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts/71290/4 "2017-01-11T23:39:03Z")

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You can use either AFAIK, but the docs refer to an array so use that.

Also you should upgrade from 1.x! 🙂

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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 8, 2017, 11:39pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts/71290/5 "2017-02-08T23:39:04Z")

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