# My es5.5.2-cluster is always red

**URL:** <https://discuss.elastic.co/t/my-es5-5-2-cluster-is-always-red/115480>\
**Category:** Elasticsearch\
**Created:** [January 15, 2018, 6:45am UTC](https://discuss.elastic.co/t/my-es5-5-2-cluster-is-always-red/115480 "2018-01-15T06:45:31Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![lichehuo](https://avatars.discourse-cdn.com/v4/letter/l/3bc359/32.png) [@lichehuo](https://discuss.elastic.co/u/lichehuo)\
**Post date:** [January 15, 2018, 6:45am UTC](https://discuss.elastic.co/t/my-es5-5-2-cluster-is-always-red/115480/1 "2018-01-15T06:45:31Z")

</div>

one of data-node is always red, its uptime upper 100.  
my datanode:32c 128G.  
my config as follow:  
elasticsearch.yml

```auto
discovery.zen.ping.unicast.hosts: ["26.6.0.163:9310", "26.6.0.162:9310", "26.6.0.161:9310"]
discovery.zen.minimum_master_nodes: 2
gateway.recover_after_nodes: 5
http.max_content_length: 100mb
transport.tcp.compress: true
transport.tcp.port: 9300
discovery.zen.ping_timeout: 100s
discovery.zen.fd.ping_timeout: 100s
node.max_local_storage_nodes: 2
action.destructive_requires_name: true
indices.fielddata.cache.size: 5gb
indices.breaker.fielddata.limit: 40%
indices.breaker.request.limit: 60%
indices.breaker.total.limit: 70%
indices.requests.cache.expire: 5m
#use for head plugins
http.cors.enabled: true
http.cors.allow-origin: "*"

```

jvm:

```auto
-Xms30g
-Xmx30g

```

GC configuration

```auto
#-XX:+UseConcMarkSweepGC
#-XX:CMSInitiatingOccupancyFraction=75
#-XX:+UseCMSInitiatingOccupancyOnly
-XX:+UseG1GC
-XX:MaxGCPauseMillis=200

```

other configs are default.

---

<div class="post-metadata">

**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [January 15, 2018, 7:31am UTC](https://discuss.elastic.co/t/my-es5-5-2-cluster-is-always-red/115480/2 "2018-01-15T07:31:40Z")

</div>

Please format your code using `</>` icon as explained in [this guide](https://discuss.elastic.co/t/about-the-elasticsearch-category/21). It will make your post more readable.

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I updated your question.

What are the logs of your master nodes? (Please format them).

Why did you change the default JVM GC settings?

---

<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 12, 2018, 7:32am UTC](https://discuss.elastic.co/t/my-es5-5-2-cluster-is-always-red/115480/3 "2018-02-12T07:32:00Z")

</div>

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