# How to config a cluster?
**URL:** https://discuss.elastic.co/t/how-to-config-a-cluster/3613
**Category:** Elasticsearch
**Created:** [December 1, 2010, 3:19am UTC](https://discuss.elastic.co/t/how-to-config-a-cluster/3613 "2010-12-01T03:19:59Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@oicqemote](https://discuss.elastic.co/u/oicqemote)
#### Post date: [December 1, 2010, 3:19am UTC](https://discuss.elastic.co/t/how-to-config-a-cluster/3613/1 "2010-12-01T03:19:59Z")
I try to start elastic search on both PC-A(172.16.40.20) and PC-B(172.16.40.199) with default setting (v-0.13), and then check cluster status, only show 1 node with yellow flag.
how can I config it? and I try to change the cluster name in elasticsearch.yml
cluster:
name:mycluster
and restart again, the cluster name still be "elasticsearch"
---
### Author:  [@oicqemote](https://discuss.elastic.co/u/oicqemote)
#### Post date: [December 2, 2010, 1:32am UTC](https://discuss.elastic.co/t/how-to-config-a-cluster/3613/2 "2010-12-02T01:32:47Z")
#1 was solved, add below in yml
discovery.zen.ping.unicast:
hosts: ["172.16.40.20:9300","172.16.101.52:9300"]
#2 is not solved.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 4:15am UTC](https://discuss.elastic.co/t/how-to-config-a-cluster/3613/3 "2017-07-06T04:15:55Z")