# Do I need restart cluster after changing \`discovery.zen.ping.unicast.hosts\`

**URL:** <https://discuss.elastic.co/t/do-i-need-restart-cluster-after-changing-discovery-zen-ping-unicast-hosts/88016>\
**Category:** Elasticsearch\
**Created:** [June 2, 2017, 4:07am UTC](https://discuss.elastic.co/t/do-i-need-restart-cluster-after-changing-discovery-zen-ping-unicast-hosts/88016 "2017-06-02T04:07:58Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![hanks](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/hanks/32/18204_2.png) [@hanks](https://discuss.elastic.co/u/hanks)\
**Post date:** [June 2, 2017, 4:07am UTC](https://discuss.elastic.co/t/do-i-need-restart-cluster-after-changing-discovery-zen-ping-unicast-hosts/88016/1 "2017-06-02T04:07:58Z")

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I want to update `discovery.zen.ping.unicast.hosts`, and is there a dynamic way to update this setting without restarting the whole cluster?

Thank you for your time.

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [June 2, 2017, 4:37am UTC](https://discuss.elastic.co/t/do-i-need-restart-cluster-after-changing-discovery-zen-ping-unicast-hosts/88016/2 "2017-06-02T04:37:04Z")

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You need to restart.

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<div class="post-metadata">

**Author:** ![hanks](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/hanks/32/18204_2.png) [@hanks](https://discuss.elastic.co/u/hanks)\
**Post date:** [June 3, 2017, 6:07am UTC](https://discuss.elastic.co/t/do-i-need-restart-cluster-after-changing-discovery-zen-ping-unicast-hosts/88016/3 "2017-06-03T06:07:44Z")

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thank you for your reply

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 1, 2017, 6:07am UTC](https://discuss.elastic.co/t/do-i-need-restart-cluster-after-changing-discovery-zen-ping-unicast-hosts/88016/4 "2017-07-01T06:07:45Z")

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