# Discovery.zen.ping.unicast.hosts in elasticsearch.yml
**URL:** https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts-in-elasticsearch-yml/155951
**Category:** Elasticsearch
**Created:** [November 8, 2018, 7:44pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts-in-elasticsearch-yml/155951 "2018-11-08T19:44:37Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@vijayakrishna.rg](https://discuss.elastic.co/u/vijayakrishna.rg)
#### Post date: [November 8, 2018, 7:44pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts-in-elasticsearch-yml/155951/1 "2018-11-08T19:44:37Z")
Hi,
I have totally 4 nodes running under my Azure scaleset, all 4 machines can be talk to each other.
it means pingable each other and telnet using port 22 and 9200 each other.
installed elasticsearch 6.x on all the 4 machines, and also updated elasticsearch.yml with below information on all 4 nodes.
node1
cluster.name: myescluster
node.name: node1
network.host: 0.0.0.0
discovery.zen.ping.unicast.hosts: ["10.0.0.1", "10.0.0.2", "10.0.0.3", "10.0.0.4"]
node.master: true
transport.tcp.port: 9300-9400
http.port: 9200
node2
cluster.name: myescluster
node.name: node2
network.host: 0.0.0.0
discovery.zen.ping.unicast.hosts: ["10.0.0.1", "10.0.0.2", "10.0.0.3", "10.0.0.4"]
node.master: true
transport.tcp.port: 9300-9400
http.port: 9200
node3
cluster.name: myescluster
node.name: node3
network.host: 0.0.0.0
discovery.zen.ping.unicast.hosts: ["10.0.0.1", "10.0.0.2", "10.0.0.3", "10.0.0.4"]
node.data: true
transport.tcp.port: 9300-9400
http.port: 9200
node4
cluster.name: myescluster
node.name: node4
network.host: 0.0.0.0
discovery.zen.ping.unicast.hosts: ["10.0.0.1", "10.0.0.2", "10.0.0.3", "10.0.0.4"]
node.data: true
transport.tcp.port: 9300-9400
http.port: 9200
When i run curl command to list nodes under cluster "curl -XGET [http://localhost:9200/\_cat/nodes?v](http://localhost:9200/_cat/nodes?v)"
it's showing only the self node where am running curl command.
[root@node1 elasticsearch]# curl -XGET [http://localhost:9200/\_cat/nodes?v](http://localhost:9200/_cat/nodes?v)
ip heap.percent ram.percent cpu load\_1m load\_5m load\_15m node.role master name
10.0.0.1 29 45 1 0.02 0.08 0.11 mdi \* node1
if i run on node2
[root@node2 elasticsearch]# curl -XGET [http://localhost:9200/\_cat/nodes?v](http://localhost:9200/_cat/nodes?v)
ip heap.percent ram.percent cpu load\_1m load\_5m load\_15m node.role master name
10.0.0.2 29 45 1 0.02 0.08 0.11 mdi \* node2
[root@node3 elasticsearch]# curl -XGET [http://localhost:9200/\_cat/nodes?v](http://localhost:9200/_cat/nodes?v)
ip heap.percent ram.percent cpu load\_1m load\_5m load\_15m node.role master name
10.0.0.3 29 45 1 0.02 0.08 0.11 mdi \* node3
[root@node4 elasticsearch]# curl -XGET [http://localhost:9200/\_cat/nodes?v](http://localhost:9200/_cat/nodes?v)
ip heap.percent ram.percent cpu load\_1m load\_5m load\_15m node.role master name
10.0.0.4 29 45 1 0.02 0.08 0.11 mdi \* node4
Cluster health:
[root@node1 elasticsearch]# curl -XGET "[http://localhost:9200/\_cluster/health](http://localhost:9200/_cluster/health)"
{"cluster\_name":"myescluster","status":"green","timed\_out":false,"number\_of\_nodes":1,"number\_of\_data\_nodes":1,"active\_primary\_shards":0,"active\_shards":0,"relocating\_shards":0,"initializing\_shards":0,"unassigned\_shards":0,"delayed\_unassigned\_shards":0,"number\_of\_pending\_tasks":0,"number\_of\_in\_flight\_fetch":0,"task\_max\_waiting\_in\_queue\_millis":0,"active\_shards\_percent\_as\_number":100.0}
Please suggest if am missing anything, Thanks.
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### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [November 8, 2018, 7:47pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts-in-elasticsearch-yml/155951/2 "2018-11-08T19:47:47Z")
Elasticsearch nodes communicate internally via the 9300 port by default, so you need to make sure this is not blocked.
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### Author:  [@vijayakrishna.rg](https://discuss.elastic.co/u/vijayakrishna.rg)
#### Post date: [November 8, 2018, 7:52pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts-in-elasticsearch-yml/155951/3 "2018-11-08T19:52:17Z")
i can do telnet to other machines using port 9200 and 9300, both are enabled on all 4 machines
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### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [November 8, 2018, 7:55pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts-in-elasticsearch-yml/155951/4 "2018-11-08T19:55:56Z")
One setting I do not see is `discovery.zen.minimum_master_nodes`, which in your case should be set to `3` as you have 4 master-eligible nodes. As the nodes are on different Ids you also do not need to give a port range - `transport.tcp.port: 9300` should do.
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### Author:  [@vijayakrishna.rg](https://discuss.elastic.co/u/vijayakrishna.rg)
#### Post date: [November 8, 2018, 8:05pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts-in-elasticsearch-yml/155951/5 "2018-11-08T20:05:19Z")
Hi Christian, thanks for your quick reply, now i see list of 4 nodes in the cluster.
But final thing is i have added **node.master: true and node.data: false** on node1 and node2 but i see only node2 showing as master in the list, in this case do i need to add **discovery.zen.minimum\_master\_nodes: 2** on all 4 nodes to setup node1 and node2 as master nodes?
curl -XGET [http://localhost:9200/\_cat/nodes?v](http://localhost:9200/_cat/nodes?v)
ip heap.percent ram.percent cpu load\_1m load\_5m load\_15m node.role master name
10.0.0.3 31 45 0 0.00 0.05 0.07 di - node3
10.0.0.2 33 45 0 0.05 0.03 0.05 mi \* node2
10.0.0.1 31 46 1 0.33 0.16 0.10 mi - node1
10.0.0.4 31 46 0 0.00 0.03 0.05 di - node4
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### Author:  [@vijayakrishna.rg](https://discuss.elastic.co/u/vijayakrishna.rg)
#### Post date: [November 8, 2018, 8:54pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts-in-elasticsearch-yml/155951/6 "2018-11-08T20:54:00Z")
i have added **discovery.zen.minimum\_master\_nodes: 2** on all 4 nodes and restarted service and still see node2 as master and other nodes are data, when i checked cluster health it says total nodes 4 and data nodes 2 what about another node, do i need to update anything in the configuration, please suggest me, Thanks.
curl -XGET "[http://localhost:9200/\_cluster/health](http://localhost:9200/_cluster/health)"
{"cluster\_name":"myescluster","status":"green","timed\_out":false,"number\_of\_nodes":4,"number\_of\_data\_nodes":2,"active\_primary\_shards":0,"active\_shards":0,"relocating\_shards":0,"initializing\_shards":0,"unassigned\_shards":0,"delayed\_unassigned\_shards":0,"number\_of\_pending\_tasks":0,"number\_of\_in\_flight\_fetch":0,"task\_max\_waiting\_in\_queue\_millis":0,"active\_shards\_percent\_as\_number":100.0}
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### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [November 8, 2018, 9:02pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts-in-elasticsearch-yml/155951/7 "2018-11-08T21:02:07Z")
You should always aim to have at least 3 master-eligible nodes in the cluster. 2 is not a good number. Only one will be acting as master at any time.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 6, 2018, 9:02pm UTC](https://discuss.elastic.co/t/discovery-zen-ping-unicast-hosts-in-elasticsearch-yml/155951/8 "2018-12-06T21:02:08Z")
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