# About elasticsearch node change

**URL:** <https://discuss.elastic.co/t/about-elasticsearch-node-change/46771>\
**Category:** Elasticsearch\
**Created:** [April 8, 2016, 7:30am UTC](https://discuss.elastic.co/t/about-elasticsearch-node-change/46771 "2016-04-08T07:30:24Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Young\_Heon\_Kim](https://avatars.discourse-cdn.com/v4/letter/y/e19b73/32.png) [@Young\_Heon\_Kim](https://discuss.elastic.co/u/Young_Heon_Kim)\
**Post date:** [April 8, 2016, 7:30am UTC](https://discuss.elastic.co/t/about-elasticsearch-node-change/46771/1 "2016-04-08T07:30:24Z")

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Hi All.

Now I kept just one node on elasticsearch.  
I would like to change from previous server to new server. And then I will add one more server.  
So finally I will keep two node cluster.

For this working, I plan to following work:

1. add new server and make two node cluster( old server + new server)
2. remove old server (operate only new server)
3. add new server one more and operate two node cluster (new server + new server)

Is this plan right?  
Let me know if this plan is wrong.

Thank you.

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**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:** [April 8, 2016, 7:40am UTC](https://discuss.elastic.co/t/about-elasticsearch-node-change/46771/2 "2016-04-08T07:40:10Z")

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Assuming your indexes have one replica each this should be okay.

Keep in mind that with a two-node cluster where both nodes are master-eligible you run the risk of a split brain situation. Consider adding a third master-only node to avoid this. The node doesn't need much in terms of CPU and RAM (compared to a data node at least).

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<div class="post-metadata">

**Author:** ![Young\_Heon\_Kim](https://avatars.discourse-cdn.com/v4/letter/y/e19b73/32.png) [@Young\_Heon\_Kim](https://discuss.elastic.co/u/Young_Heon_Kim)\
**Post date:** [April 8, 2016, 8:07am UTC](https://discuss.elastic.co/t/about-elasticsearch-node-change/46771/3 "2016-04-08T08:07:42Z")

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Thank you for your answer.  
Master-node doesn't have data ? right?  
What does it doing exactly master node?

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**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:** [April 8, 2016, 8:12am UTC](https://discuss.elastic.co/t/about-elasticsearch-node-change/46771/4 "2016-04-08T08:12:20Z")

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Please read [https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-node.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-node.html) and come back if you have any further questions.

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**Author:** ![Young\_Heon\_Kim](https://avatars.discourse-cdn.com/v4/letter/y/e19b73/32.png) [@Young\_Heon\_Kim](https://discuss.elastic.co/u/Young_Heon_Kim)\
**Post date:** [April 8, 2016, 9:30am UTC](https://discuss.elastic.co/t/about-elasticsearch-node-change/46771/5 "2016-04-08T09:30:59Z")

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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:** [July 5, 2017, 11:01pm UTC](https://discuss.elastic.co/t/about-elasticsearch-node-change/46771/6 "2017-07-05T23:01:12Z")

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