# Cluster Nodes are not reflecting **URL:** \ **Category:** Elasticsearch\ **Created:** [March 14, 2021, 3:26pm UTC](https://discuss.elastic.co/t/cluster-nodes-are-not-reflecting/267194 "2021-03-14T15:26:52Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![roh689](https://avatars.discourse-cdn.com/v4/letter/r/439d5e/32.png) [@roh689](https://discuss.elastic.co/u/roh689)\ **Post date:** [March 14, 2021, 3:26pm UTC](https://discuss.elastic.co/t/cluster-nodes-are-not-reflecting/267194/1 "2021-03-14T15:26:52Z")
We were using elasticsearch with only 1 node i.e. ES01 which also have log data of almost 2 weeks. Now we are trying to expand to 3 nodes with additional 2 servers i.e. ES02 & ES03, configured yml files on these 2 servers with same cluster name and parameters. Defining ES01 & ES03 as data node and ES02 as master node. But when we checking through "GET /\_cluster/state?pretty" only ES02 node is reflecting, other 2 nodes are not reflecting. Also checked through cluster logs, getting below error : Caused by: java.lang.IllegalStateException: failure when sending a validation request to node Caused by: org.elasticsearch.transport.RemoteTransportException: [es-01][10.0.0.4:9300][internal:cluster/coordination/join/validate] Caused by: org.elasticsearch.cluster.coordination.CoordinationStateRejectedException: join validation on cluster state with a different cluster uuid 6dNKxAyJQOWO-fB2jKK8GA than local cluster uuid bHr4ENdkT0yt92UWGhDLYw, rejecting Can you please check and let me know what is the resolution of this error/issue ? ---
**Author:** ![roh689](https://avatars.discourse-cdn.com/v4/letter/r/439d5e/32.png) [@roh689](https://discuss.elastic.co/u/roh689)\ **Post date:** [March 15, 2021, 3:32am UTC](https://discuss.elastic.co/t/cluster-nodes-are-not-reflecting/267194/2 "2021-03-15T03:32:16Z")
can anyone suggest on this issue ? ---
**Author:** ![stephenb](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stephenb/32/40856_2.png) [@stephenb](https://discuss.elastic.co/u/stephenb)\ **Post date:** [March 15, 2021, 4:01am UTC](https://discuss.elastic.co/t/cluster-nodes-are-not-reflecting/267194/3 "2021-03-15T04:01:28Z")
1st on a 3 node cluster you should make all 3 data plus master that much better configuration, not just 1 master. In fact if you are just learning just leave the default node roles. On ES01 elasticsearch.yml originally did you set or is it still set? discovery.type : single-node If so it will not join the other the other nodes and now you have 2 separate clusters? That is what log says 2 cluster UUIDs. If you did you will need to clean out the ED02/03 get the settings right and then restart. You should read [this](https://www.elastic.co/guide/en/elasticsearch/reference/7.11/modules-discovery-bootstrap-cluster.html) it tells about cleaning up and getting the cluster bootstrapped ---
**Author:** ![roh689](https://avatars.discourse-cdn.com/v4/letter/r/439d5e/32.png) [@roh689](https://discuss.elastic.co/u/roh689)\ **Post date:** [March 15, 2021, 4:35am UTC](https://discuss.elastic.co/t/cluster-nodes-are-not-reflecting/267194/4 "2021-03-15T04:35:38Z")
We have also enable XPACK on all 3 nodes, generated passwords from ES02 but the same credentials not able to run curl command. In short, how to configure 3 node cluster if XPACK is enable ? ---
**Author:** ![stephenb](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stephenb/32/40856_2.png) [@stephenb](https://discuss.elastic.co/u/stephenb)\ **Post date:** [March 15, 2021, 5:07am UTC](https://discuss.elastic.co/t/cluster-nodes-are-not-reflecting/267194/5 "2021-03-15T05:07:43Z")
I think you need to refer to the documentation. XPack is a lot of things , perhaps you are talking about security See [here](https://www.elastic.co/guide/en/elasticsearch/reference/7.11/configuring-security.html) [here](https://www.elastic.co/guide/en/elasticsearch/reference/7.11/modules-discovery.html) is how to form a cluster. You really need to go about this in a methodical way. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [April 12, 2021, 5:08am UTC](https://discuss.elastic.co/t/cluster-nodes-are-not-reflecting/267194/6 "2021-04-12T05:08:22Z")
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