# \[Solved\] - How to create a replica node only to existing cluster **URL:** \ **Category:** Elasticsearch\ **Created:** [November 12, 2019, 9:18am UTC](https://discuss.elastic.co/t/solved-how-to-create-a-replica-node-only-to-existing-cluster/207473 "2019-11-12T09:18:49Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![JH82](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jh82/32/45952_2.png) [@JH82](https://discuss.elastic.co/u/JH82)\ **Post date:** [November 12, 2019, 9:18am UTC](https://discuss.elastic.co/t/solved-how-to-create-a-replica-node-only-to-existing-cluster/207473/1 "2019-11-12T09:18:49Z")
Hello, Today I've only 1 node. (health is marked Yellow, because is not HA) is it possible to add a replica node only to a cluster ? I wish to have 1 node active and 1 datanode only for search with replica data from first node ; health monitor will be "green" ... can you help me about configuration element to specify a replica node. Thanks for all. Regards. ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [November 12, 2019, 9:31am UTC](https://discuss.elastic.co/t/solved-how-to-create-a-replica-node-only-to-existing-cluster/207473/2 "2019-11-12T09:31:33Z")
Bonjour Jacques 🙂 You just need to start a new node. With the right configuration, it will join the cluster and replicas will be eventually allocated on it. Read also [https://www.elastic.co/guide/en/elasticsearch/reference/current/important-settings.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/important-settings.html) ---
**Author:** ![JH82](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jh82/32/45952_2.png) [@JH82](https://discuss.elastic.co/u/JH82)\ **Post date:** [November 12, 2019, 10:04am UTC](https://discuss.elastic.co/t/solved-how-to-create-a-replica-node-only-to-existing-cluster/207473/3 "2019-11-12T10:04:38Z")
> [@dadoonet](#): > > With the right configuration My post is about this. what is the right configutation to make a node with replica only 😉 ? ---
**Author:** ![JH82](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jh82/32/45952_2.png) [@JH82](https://discuss.elastic.co/u/JH82)\ **Post date:** [November 12, 2019, 10:34am UTC](https://discuss.elastic.co/t/solved-how-to-create-a-replica-node-only-to-existing-cluster/207473/4 "2019-11-12T10:34:45Z")
Can you confirm is it possible to make HA with **only 2 nodes** (1 master, 1 replica - not 3 nodes) ? All examples found are with 3 nodes... ---
**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 12, 2019, 10:50am UTC](https://discuss.elastic.co/t/solved-how-to-create-a-replica-node-only-to-existing-cluster/207473/5 "2019-11-12T10:50:52Z")
> [@JH82](#): > > My post is about this. what is the right configutation to make a node with replica only 😉 ? There is no such configuration, but there is no need to do this. Just add a node and let Elasticsearch allocate the shards as it sees fit. > [@JH82](#): > > Can you confirm is it possible to make HA with **only 2 nodes** (1 master, 1 replica - not 3 nodes) ? All examples found are with 3 nodes... No, this is not possible. You need three master-eligible nodes for high availability. ---
**Author:** ![JH82](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jh82/32/45952_2.png) [@JH82](https://discuss.elastic.co/u/JH82)\ **Post date:** [November 12, 2019, 12:38pm UTC](https://discuss.elastic.co/t/solved-how-to-create-a-replica-node-only-to-existing-cluster/207473/6 "2019-11-12T12:38:40Z")
ok that explains why I do not find how to do 😉 Thanks ! ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 10, 2019, 12:38pm UTC](https://discuss.elastic.co/t/solved-how-to-create-a-replica-node-only-to-existing-cluster/207473/7 "2019-12-10T12:38:52Z")
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