# Cluster config?

**URL:** <https://discuss.elastic.co/t/cluster-config/75504>\
**Category:** Elasticsearch\
**Created:** [February 17, 2017, 2:04pm UTC](https://discuss.elastic.co/t/cluster-config/75504 "2017-02-17T14:04:47Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ggp](https://avatars.discourse-cdn.com/v4/letter/g/278dde/32.png) [@ggp](https://discuss.elastic.co/u/ggp)\
**Post date:** [February 17, 2017, 2:04pm UTC](https://discuss.elastic.co/t/cluster-config/75504/1 "2017-02-17T14:04:47Z")

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currently we are building a 9 node cluster with 4 Data Nodes, 3 Master and 2 Client(coordinating) Nodes, when i do cluster config for zen discovery should i just have 3 Master IP/Host Name in all of the nodes zen.discovery hosts ?

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**Author:** ![danielmitterdorfer](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/danielmitterdorfer/32/110510_2.png) [@danielmitterdorfer](https://discuss.elastic.co/u/danielmitterdorfer)\
**Post date:** [February 17, 2017, 2:29pm UTC](https://discuss.elastic.co/t/cluster-config/75504/2 "2017-02-17T14:29:06Z")

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Hi @ggp,

yes, just having the master nodes in there is fine. See the [Definitive Guide](https://www.elastic.co/guide/en/elasticsearch/guide/2.x/important-configuration-changes.html#unicast) for details.

Daniel

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**Author:** ![ggp](https://avatars.discourse-cdn.com/v4/letter/g/278dde/32.png) [@ggp](https://discuss.elastic.co/u/ggp)\
**Post date:** [February 17, 2017, 2:49pm UTC](https://discuss.elastic.co/t/cluster-config/75504/3 "2017-02-17T14:49:03Z")

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thank you,

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**Author:** ![ggp](https://avatars.discourse-cdn.com/v4/letter/g/278dde/32.png) [@ggp](https://discuss.elastic.co/u/ggp)\
**Post date:** [February 17, 2017, 2:49pm UTC](https://discuss.elastic.co/t/cluster-config/75504/4 "2017-02-17T14:49:20Z")

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thank you

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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:** [March 17, 2017, 2:49pm UTC](https://discuss.elastic.co/t/cluster-config/75504/5 "2017-03-17T14:49:56Z")

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