# Adding new master nodes to old cluster **URL:** \ **Category:** Elasticsearch\ **Created:** [November 8, 2018, 12:52pm UTC](https://discuss.elastic.co/t/adding-new-master-nodes-to-old-cluster/155887 "2018-11-08T12:52:34Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![saif](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/saif/32/37431_2.png) [@saif](https://discuss.elastic.co/u/saif)\ **Post date:** [November 8, 2018, 12:52pm UTC](https://discuss.elastic.co/t/adding-new-master-nodes-to-old-cluster/155887/1 "2018-11-08T12:52:34Z")
I have a production cluster with 4 master+Data node under X-pack Plat licence We planning to split master and data node role, so i will add 3 master only node and set the master/data node to data node only so my question is how to do this without without downtime ---
**Author:** ![mats990](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mats990/32/37516_2.png) [@mats990](https://discuss.elastic.co/u/mats990)\ **Post date:** [November 8, 2018, 1:07pm UTC](https://discuss.elastic.co/t/adding-new-master-nodes-to-old-cluster/155887/2 "2018-11-08T13:07:18Z")
I suppose that you have replication enabled. In that case I'd do the following: - setup `discovery.zen.minimum_master_nodes=3` [https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-discovery-zen.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-discovery-zen.html) (I think that you have wrong config right now since you have 4 master eligible nodes) - shutdown 1st data/master node and configure it to have only data role - wait for green cluster - shutdown 2nd data/master node and configure it to have only data role - start 1st master only node - wait for green cluster - check that you have 3 master eligible nodes - shutdown 3rd data/master node and configure it to have only data role - start 2nd master only node - wait for green cluster - check that you have 3 master eligible nodes - shutdown 4th data/master node and configure it to have only data role - start 3rd master only node - wait for green cluster - check that you have 3 master eligible nodes **Please check the settings before any modification so you do not end up without master node** ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [November 8, 2018, 1:56pm UTC](https://discuss.elastic.co/t/adding-new-master-nodes-to-old-cluster/155887/3 "2018-11-08T13:56:58Z")
> [@saif](#): > > I have a production cluster with 4 master+Data node under X-pack Plat licence If you have a Platinum licence for this cluster then you are eligible for support. Please get hold of your support contact who should be happy to guide you through this process. I would do roughly what @mats990 said, except that I'd start one of the new dedicated master nodes first. With `discovery.zen.minimum_master_nodes: 3` you can have up to 5 master-eligible nodes, and the more of them you have the more resilient you are to failures, so I'd try and do the process with 4 or 5 master nodes online instead of 3 or 4. ---
**Author:** ![saif](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/saif/32/37431_2.png) [@saif](https://discuss.elastic.co/u/saif)\ **Post date:** [November 8, 2018, 2:09pm UTC](https://discuss.elastic.co/t/adding-new-master-nodes-to-old-cluster/155887/4 "2018-11-08T14:09:19Z")
ok thank you yes but i prefer help elastic community 🙂 and i like this discuss ! so if i understand : i'd start with the new master with discovery.zen.ping.unicast.hosts: ["oldmasterdata1", "oldmasterdata2", "oldmasterdata3", "newmasteronly", "newmasteronly2", "newmasteronly3"] then start oldmasterdata1 change conf with the same discovery.zen.ping.unicast.hosts "like the newmaster" oldmasterdata1 : configure and restart it newmasteronly2: configure and restart it oldmasterdata2: configure and restart it newmasteronly3: configure and restart it oldmasterdata3: configure and restart it oldmasterdata4: configure and restart it ..........and at the end re-change discovery.zen.minimum\_master\_nodes : 2 and discovery.zen.ping.unicast.hosts: ["newmasteronly", "newmasteronly2", "newmasteronly3"] then restart all nodes ? that's right ? ---
**Author:** ![saif](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/saif/32/37431_2.png) [@saif](https://discuss.elastic.co/u/saif)\ **Post date:** [November 16, 2018, 1:33pm UTC](https://discuss.elastic.co/t/adding-new-master-nodes-to-old-cluster/155887/5 "2018-11-16T13:33:20Z")
no response ? ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [November 16, 2018, 1:50pm UTC](https://discuss.elastic.co/t/adding-new-master-nodes-to-old-cluster/155887/6 "2018-11-16T13:50:46Z")
> [@saif](#): > > that's right ? It's hard to say, there's lots of detail missing in your post. How will you be reconfiguring each node? How will you be changing `discovery.zen.minimum_master_nodes` throughout? It sounds like you're going along the right path, but there's a risk of getting things wrong in this process and losing data as a result. ---
**Author:** ![saif](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/saif/32/37431_2.png) [@saif](https://discuss.elastic.co/u/saif)\ **Post date:** [November 16, 2018, 2:06pm UTC](https://discuss.elastic.co/t/adding-new-master-nodes-to-old-cluster/155887/7 "2018-11-16T14:06:17Z")
sorry yes it'snot clear . i have 3 new master (with no config) and 4 nodes (3 data/master plus 1 data node) i want to add the new 3 master and the change the old node to data only and to have as result discovery.zen.minimum\_master\_nodes : 2 Thnx ! ---
**Author:** ![saif](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/saif/32/37431_2.png) [@saif](https://discuss.elastic.co/u/saif)\ **Post date:** [November 20, 2018, 1:04pm UTC](https://discuss.elastic.co/t/adding-new-master-nodes-to-old-cluster/155887/8 "2018-11-20T13:04:27Z")
ok i will create a case .... ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 18, 2018, 1:04pm UTC](https://discuss.elastic.co/t/adding-new-master-nodes-to-old-cluster/155887/9 "2018-12-18T13:04:28Z")
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