# Add new master to the ES cluster **URL:** \ **Category:** Elasticsearch\ **Tags:** elastic-stack-monitoring, elastic-stack-security\ **Created:** [March 17, 2025, 11:02am UTC](https://discuss.elastic.co/t/add-new-master-to-the-es-cluster/376000 "2025-03-17T11:02:14Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![piyushgupta](https://avatars.discourse-cdn.com/v4/letter/p/c0e974/32.png) [@piyushgupta](https://discuss.elastic.co/u/piyushgupta)\ **Post date:** [March 17, 2025, 11:02am UTC](https://discuss.elastic.co/t/add-new-master-to-the-es-cluster/376000/1 "2025-03-17T11:02:14Z")
Hi We are having ES cluster 7.10.0 with total 5 nodes 3 master node 3 data node 1 node serves as both data and master node i have plan to add 1 more master only node is any risk on adding new master only node to cluster , considering cluster is production cluster and number of master node become 4 which is not odd number ---
**Author:** ![RainTown](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/raintown/32/140206_2.png) [@RainTown](https://discuss.elastic.co/u/RainTown)\ **Post date:** [March 17, 2025, 11:11am UTC](https://discuss.elastic.co/t/add-new-master-to-the-es-cluster/376000/2 "2025-03-17T11:11:20Z")
While noting this topic is being discussed in another thread too > [@Migrate node from master + data to data only](https://discuss.elastic.co/t/migrate-node-from-master-data-to-data-only/375882/11): > > Hi @leandrojmp sorry one more question do you see any issue if i add one extra master node to existing cluster that make total master to be 4 , like breaking some quoram ? Any additional step or operation i need to do to make cluster stable ? what is your rationale to make a 4th master node? In case of your 5-node cluster, it's certainly better to have a 6-node cluster with 3x masters and 3x data. But a 7-node cluster, 4x master and 3x data, would seem to me to add very little, if 2 masters are unavailable you will have problems. ---
**Author:** ![piyushgupta](https://avatars.discourse-cdn.com/v4/letter/p/c0e974/32.png) [@piyushgupta](https://discuss.elastic.co/u/piyushgupta)\ **Post date:** [March 17, 2025, 11:43am UTC](https://discuss.elastic.co/t/add-new-master-to-the-es-cluster/376000/3 "2025-03-17T11:43:51Z")
Thanks @RainTown I would like to modify cluster 1. Add new master which make total master node to 4 2. Modify the existing data +master node to data node , so that overall nodes will be 6 with 3 master and 3 slave I want to know if i do step 1 does it impact current cluster stability ? because after step 1 i can go for step 2 ---
**Author:** ![RainTown](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/raintown/32/140206_2.png) [@RainTown](https://discuss.elastic.co/u/RainTown)\ **Post date:** [March 17, 2025, 11:55am UTC](https://discuss.elastic.co/t/add-new-master-to-the-es-cluster/376000/4 "2025-03-17T11:55:22Z")
That approach seems fine. To get to 3x master and 3x data, from where you are now, that is the best approach IMO. But tbh this is exactly the topic of the parallel thread. ---
**Author:** ![piyushgupta](https://avatars.discourse-cdn.com/v4/letter/p/c0e974/32.png) [@piyushgupta](https://discuss.elastic.co/u/piyushgupta)\ **Post date:** [March 17, 2025, 12:06pm UTC](https://discuss.elastic.co/t/add-new-master-to-the-es-cluster/376000/5 "2025-03-17T12:06:43Z")
Yes @RainTown but still i want to be check if i add 4 th master in cluster , will it impact my current running cluster ? as its production cluster i want to be careful