# ES nodes disconnects intermittently from the cluster

**URL:** https://discuss.elastic.co/t/es-nodes-disconnects-intermittently-from-the-cluster/115039
**Category:** Elasticsearch
**Created:** [January 11, 2018, 8:51am UTC](https://discuss.elastic.co/t/es-nodes-disconnects-intermittently-from-the-cluster/115039 "2018-01-11T08:51:19Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Neeraj\_Gupta](https://avatars.discourse-cdn.com/v4/letter/n/96bed5/32.png) [@Neeraj\_Gupta](https://discuss.elastic.co/u/Neeraj_Gupta)
#### Post date: [January 11, 2018, 8:51am UTC](https://discuss.elastic.co/t/es-nodes-disconnects-intermittently-from-the-cluster/115039/1 "2018-01-11T08:51:19Z")

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I have a 12 node cluster for elasticsearch(version 2.4), all the machines are on EC2-instances. IN between I am getting errors like master left due to which unassigned shards increases and cluster health turns to red.

`[2018-01-11 07:48:44,828][INFO][discovery.zen] [esnode21] master_left [{esnode12}{-YkCOqMRSoSR8CiQwZG_cw}{x.x.x.x}{x.x.x.x:9300}], reason [failed to ping, tried [3] times, each with maximum [1h] timeout]`

Before these logs its just a normal GC activity no errors.  
We have tested the network configuration even ran a test to test network drops and everything seems fine.

Increased the [fault-detection](https://www.elastic.co/guide/en/elasticsearch/reference/2.4/modules-discovery-zen.html#fault-detection) to following :-  
discovery.zen.fd.ping\_interval: 1800s  
discovery.zen.fd.ping\_timeout: 3600s

After going through various blogs I came across [Nodes randomly disconnected from the ES cluster](https://discuss.elastic.co/t/nodes-randomly-disconnected-from-the-es-cluster/23028/6). I have also truned of scatter-gather using ethtool as mentioned in [https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1317811](https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1317811).

Still these errors are occurring intermittently. Please suggest something.

Thanks

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<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: [February 8, 2018, 8:51am UTC](https://discuss.elastic.co/t/es-nodes-disconnects-intermittently-from-the-cluster/115039/2 "2018-02-08T08:51:50Z")

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