# ES cluster sometimes disconnect!

**URL:** <https://discuss.elastic.co/t/es-cluster-sometimes-disconnect/120186>\
**Category:** Elasticsearch\
**Created:** [February 16, 2018, 1:49pm UTC](https://discuss.elastic.co/t/es-cluster-sometimes-disconnect/120186 "2018-02-16T13:49:34Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![f26227279](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/f26227279/32/21296_2.png) [@f26227279](https://discuss.elastic.co/u/f26227279)\
**Post date:** [February 16, 2018, 1:49pm UTC](https://discuss.elastic.co/t/es-cluster-sometimes-disconnect/120186/1 "2018-02-16T13:49:34Z")

</div>

Hi everyone, my OS is centos7. I set a cluster and input data through logstash, but I found sometimes logsatsh can't connect to ES and this is the error warnning:

```
[2018-02-13T17:01:34,860][WARN][logstash.outputs.elasticsearch] Marking url as dead. Last error: [LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError] Elasticsearch Unreachable: [http://163.19.163.XXX:9200/][Manticore::SocketTimeout] Read timed out {:url=>http://163.19.163.XXX:9200/, :error_message=>"Elasticsearch Unreachable: [http://163.19.163.XXX:9200/][Manticore::SocketTimeout] Read timed out", :error_class[2018-02-13T17:01:38,249][INFO][logstash.outputs.elasticsearch] Running health check to see if an Elasticsearch connection is working {:healthcheck_url=>http://163.19.163.XXX:9200/, :path=>"/"}
[2018-02-13T17:01:38,250][WARN][logstash.outputs.elasticsearch] Restored connection to ES instance {:url=>"http://163.19.163.XXX:9200/"}

```

this is my ES config:

```
 # ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 163.19.163.XX
#
# Set a custom port for HTTP:
#
#http.port: 9200
#
# For more information, consult the network module documentation.
#
# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when new node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
discovery.zen.ping.unicast.hosts: ["163.19.163.XX", "163.19.163.XX", "163.19.163.XX"]
#
# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
#
#discovery.zen.minimum_master_nodes: 3
#
# For more information, consult the zen discovery module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
#
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true

```

but if I input data to the pc of logstash itself there would have no error happen,when I connect to other ES and input data to them, then sometimes it would disconnect.  
How can I avoid the error happen?

thank you in advance!

---

<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:** [March 16, 2018, 1:49pm UTC](https://discuss.elastic.co/t/es-cluster-sometimes-disconnect/120186/2 "2018-03-16T13:49:49Z")

</div>

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