# Elasticsearch cluster

**URL:** <https://discuss.elastic.co/t/elasticsearch-cluster/252379>\
**Category:** Elasticsearch\
**Created:** [October 16, 2020, 5:31pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster/252379 "2020-10-16T17:31:37Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![bognad](https://avatars.discourse-cdn.com/v4/letter/b/8e8cbc/32.png) [@bognad](https://discuss.elastic.co/u/bognad)\
**Post date:** [October 16, 2020, 5:31pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster/252379/1 "2020-10-16T17:31:38Z")

</div>

Good day!  
I am having difficulty to create 2 nodes cluster, each nodes has different "cluster.uuid".  
Why? How add node to cluster?

Node A

```
cluster.name: "elk-cluster"
network.host: 0.0.0.0
node.name: primary

cluster.initial_master_nodes:
  - primary
  - secondary

discovery.seed_hosts:
  - primary.local
  - secondary.local

```

Node B

```
cluster.name: "elk-cluster"
network.host: 0.0.0.0
node.name: secondary

discovery.seed_hosts:
  - primary.local
  - secondary.local

cluster.initial_master_nodes:
  - primary
  - secondary
```

---

<div class="post-metadata">

**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [October 16, 2020, 5:33pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster/252379/2 "2020-10-16T17:33:19Z")

</div>

Which version of Elasticsearch are you using?

---

<div class="post-metadata">

**Author:** ![bognad](https://avatars.discourse-cdn.com/v4/letter/b/8e8cbc/32.png) [@bognad](https://discuss.elastic.co/u/bognad)\
**Post date:** [October 16, 2020, 6:01pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster/252379/3 "2020-10-16T18:01:03Z")

</div>

Node A logs:

```
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:57:24,154+0000", "level": "INFO", "component": "o.e.n.Node", "cluster.name": "elk-cluster", "node.name": "primary", "message": "initialized" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:57:24,155+0000", "level": "INFO", "component": "o.e.n.Node", "cluster.name": "elk-cluster", "node.name": "primary", "message": "starting ..." }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:57:24,320+0000", "level": "INFO", "component": "o.e.t.TransportService", "cluster.name": "elk-cluster", "node.name": "primary", "message": "publish_address {172.19.0.2:9300}, bound_addresses {0.0.0.0:9300}" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:57:24,329+0000", "level": "INFO", "component": "o.e.b.BootstrapChecks", "cluster.name": "elk-cluster", "node.name": "primary", "message": "bound or publishing to a non-loopback address, enforcing bootstrap checks" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:57:24,343+0000", "level": "INFO", "component": "o.e.c.c.Coordinator", "cluster.name": "elk-cluster", "node.name": "primary", "message": "cluster UUID [T7OI4j3uQGexfTvKnDV7Gg]" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:57:25,109+0000", "level": "INFO", "component": "o.e.c.s.MasterService", "cluster.name": "elk-cluster", "node.name": "primary", "message": "elected-as-master ([1] nodes joined)[{primary}{RqQaxTmnSre0YJbou0RPLA}{1HE7-VlvRlyzgSqhh-eElg}{172.19.0.2}{172.19.0.2:9300}{ml.machine_memory=33811034112, xpack.installed=true, ml.max_open_jobs=20} elect leader, _BECOME_MASTER_TASK_, _FINISH_ELECTION_], term: 33, version: 12709, reason: master node changed {previous [], current [{primary}{RqQaxTmnSre0YJbou0RPLA}{1HE7-VlvRlyzgSqhh-eElg}{172.19.0.2}{172.19.0.2:9300}{ml.machine_memory=33811034112, xpack.installed=true, ml.max_open_jobs=20}]}" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:57:25,192+0000", "level": "WARN", "component": "o.e.m.j.JvmGcMonitorService", "cluster.name": "elk-cluster", "node.name": "primary", "message": "[gc][1] overhead, spent [529ms] collecting in the last [1s]" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:57:32,948+0000", "level": "INFO", "component": "o.e.c.s.ClusterApplierService", "cluster.name": "elk-cluster", "node.name": "primary", "message": "master node changed {previous [], current [{primary}{RqQaxTmnSre0YJbou0RPLA}{1HE7-VlvRlyzgSqhh-eElg}{172.19.0.2}{172.19.0.2:9300}{ml.machine_memory=33811034112, xpack.installed=true, ml.max_open_jobs=20}]}, term: 33, version: 12709, reason: Publication{term=33, version=12709}" }
```

---

<div class="post-metadata">

**Author:** ![bognad](https://avatars.discourse-cdn.com/v4/letter/b/8e8cbc/32.png) [@bognad](https://discuss.elastic.co/u/bognad)\
**Post date:** [October 16, 2020, 6:02pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster/252379/4 "2020-10-16T18:02:39Z")

</div>

Node B logs

```
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:58:28,225+0000", "level": "INFO", "component": "o.e.n.Node", "cluster.name": "elk-cluster", "node.name": "secondary", "message": "initialized" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:58:28,226+0000", "level": "INFO", "component": "o.e.n.Node", "cluster.name": "elk-cluster", "node.name": "secondary", "message": "starting ..." }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:58:28,386+0000", "level": "INFO", "component": "o.e.t.TransportService", "cluster.name": "elk-cluster", "node.name": "secondary", "message": "publish_address {172.18.0.2:9300}, bound_addresses {0.0.0.0:9300}" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:58:28,396+0000", "level": "INFO", "component": "o.e.b.BootstrapChecks", "cluster.name": "elk-cluster", "node.name": "secondary", "message": "bound or publishing to a non-loopback address, enforcing bootstrap checks" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:58:28,405+0000", "level": "INFO", "component": "o.e.c.c.Coordinator", "cluster.name": "elk-cluster", "node.name": "secondary", "message": "cluster UUID [9b393qw_SiaF_YqlP8QY_g]" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:58:28,596+0000", "level": "INFO", "component": "o.e.c.s.MasterService", "cluster.name": "elk-cluster", "node.name": "secondary", "message": "elected-as-master ([1] nodes joined)[{secondary}{_CQL6DToQoWlSnaKkr3eNg}{g6g5jXjdSBa3aRpfBe9Tsg}{172.18.0.2}{172.18.0.2:9300}{ml.machine_memory=63326285824, xpack.installed=true, ml.max_open_jobs=20} elect leader, _BECOME_MASTER_TASK_, _FINISH_ELECTION_], term: 17, version: 143, reason: master node changed {previous [], current [{secondary}{_CQL6DToQoWlSnaKkr3eNg}{g6g5jXjdSBa3aRpfBe9Tsg}{172.18.0.2}{172.18.0.2:9300}{ml.machine_memory=63326285824, xpack.installed=true, ml.max_open_jobs=20}]}" }
elasticsearch_1 | {"type": "server", "timestamp": "2020-10-16T17:58:28,758+0000", "level": "INFO", "component": "o.e.c.s.ClusterApplierService", "cluster.name": "elk-cluster", "node.name": "secondary", "message": "master node changed {previous [], current [{secondary}{_CQL6DToQoWlSnaKkr3eNg}{g6g5jXjdSBa3aRpfBe9Tsg}{172.18.0.2}{172.18.0.2:9300}{ml.machine_memory=63326285824, xpack.installed=true, ml.max_open_jobs=20}]}, term: 17, version: 143, reason: Publication{term=17, version=143}" }
```

---

<div class="post-metadata">

**Author:** ![bognad](https://avatars.discourse-cdn.com/v4/letter/b/8e8cbc/32.png) [@bognad](https://discuss.elastic.co/u/bognad)\
**Post date:** [October 16, 2020, 6:02pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster/252379/5 "2020-10-16T18:02:57Z")

</div>

Elasticsearch 7.2 version

---

<div class="post-metadata">

**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [October 16, 2020, 6:41pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster/252379/6 "2020-10-16T18:41:53Z")

</div>

I wonder if you have started them up previously with different configuration which is still active. Could you please delete the two data directories completely and start the nodes again?

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<div class="post-metadata">

**Author:** ![bognad](https://avatars.discourse-cdn.com/v4/letter/b/8e8cbc/32.png) [@bognad](https://discuss.elastic.co/u/bognad)\
**Post date:** [November 9, 2020, 3:32pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster/252379/7 "2020-11-09T15:32:46Z")

</div>

Christian, i cannot delete primary's data directories. Primary node is production server. I have tried to delete secondary's node data.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 7, 2020, 3:32pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster/252379/8 "2020-12-07T15:32:48Z")

</div>

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