# Nodes not joining cluster after upgrade to elasticsearch 2.0 **URL:** \ **Category:** Elasticsearch\ **Created:** [November 3, 2015, 5:29pm UTC](https://discuss.elastic.co/t/nodes-not-joining-cluster-after-upgrade-to-elasticsearch-2-0/33659 "2015-11-03T17:29:47Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![mgirndt](https://avatars.discourse-cdn.com/v4/letter/m/fbc32d/32.png) [@mgirndt](https://discuss.elastic.co/u/mgirndt)\ **Post date:** [November 3, 2015, 5:29pm UTC](https://discuss.elastic.co/t/nodes-not-joining-cluster-after-upgrade-to-elasticsearch-2-0/33659/1 "2015-11-03T17:29:47Z")
I have upgraded elasticsearch logstash and kibana and after the upgrade my nodes wont join the cluster. I have two nodes. I want one to be a master and data node the other to just be a data node. When I check the state of the cluster it only shows there to be one node. Any help is appreciated. Thanks, Michael ---
**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\ **Post date:** [November 3, 2015, 6:18pm UTC](https://discuss.elastic.co/t/nodes-not-joining-cluster-after-upgrade-to-elasticsearch-2-0/33659/2 "2015-11-03T18:18:38Z")
Out of the box Elasticsearch 2.0 binds to localhost only. See [https://www.elastic.co/guide/en/elasticsearch/reference/2.0/\_network\_changes.html](https://www.elastic.co/guide/en/elasticsearch/reference/2.0/_network_changes.html). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 5, 2017, 11:40pm UTC](https://discuss.elastic.co/t/nodes-not-joining-cluster-after-upgrade-to-elasticsearch-2-0/33659/3 "2017-07-05T23:40:50Z")
Closed on July 5, 2017, 11:40pm UTC