# Data node & unicast hosts

**URL:** <https://discuss.elastic.co/t/data-node-unicast-hosts/32092>\
**Category:** Elasticsearch\
**Created:** [October 13, 2015, 2:18pm UTC](https://discuss.elastic.co/t/data-node-unicast-hosts/32092 "2015-10-13T14:18:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![N\_M\_10](https://avatars.discourse-cdn.com/v4/letter/n/f19dbf/32.png) [@N\_M\_10](https://discuss.elastic.co/u/N_M_10)\
**Post date:** [October 13, 2015, 2:18pm UTC](https://discuss.elastic.co/t/data-node-unicast-hosts/32092/1 "2015-10-13T14:18:03Z")

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Do data node required to have the below command in its \*.yml?

```
discovery.zen.ping.unicast.hosts: ["master1","master2","master3"]
```

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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:** [October 13, 2015, 8:15pm UTC](https://discuss.elastic.co/t/data-node-unicast-hosts/32092/2 "2015-10-13T20:15:42Z")

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Yes, otherwise it cannot discover the other nodes.

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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:** [July 5, 2017, 11:45pm UTC](https://discuss.elastic.co/t/data-node-unicast-hosts/32092/3 "2017-07-05T23:45:01Z")

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