# How to configure 2 nodes in a cluster so they communicate with each other

**URL:** <https://discuss.aerospike.com/t/how-to-configure-2-nodes-in-a-cluster-so-they-communicate-with-each-other/2104>\
**Category:** Configuration\
**Created:** [November 10, 2015, 12:25pm UTC](https://discuss.aerospike.com/t/how-to-configure-2-nodes-in-a-cluster-so-they-communicate-with-each-other/2104 "2015-11-10T12:25:13Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![ManishOjha](https://avatars.discourse-cdn.com/v4/letter/m/ecccb3/32.png) [@ManishOjha](https://discuss.aerospike.com/u/ManishOjha)\
**Post date:** [November 10, 2015, 12:25pm UTC](https://discuss.aerospike.com/t/how-to-configure-2-nodes-in-a-cluster-so-they-communicate-with-each-other/2104/1 "2015-11-10T12:25:13Z")

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I have installed Aerospike on 2 Linux servers (ubuntu and RedHat). Now I want to try and use these servers as peers in a cluster. I have copied the configuration file (aersospike.conf) of ubuntu to RedHat box as well. When I restart the server I can see the namespaces that I have added in Ubuntu. However when I update the Sets and bins I am unable to see them in RedHat but only in Ubuntu. I understand that I have to use heartbeat (multicast/mesh) mode in config file. But not sure how it should be configured to make these nodes communicate with each other.

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**Author:** ![kporter](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/kporter/32/515_2.png) [@kporter](https://discuss.aerospike.com/u/kporter)\
**Post date:** [November 10, 2015, 10:22pm UTC](https://discuss.aerospike.com/t/how-to-configure-2-nodes-in-a-cluster-so-they-communicate-with-each-other/2104/2 "2015-11-10T22:22:41Z")

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Could you supply the output of:

```auto
asadm -e info

```

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<div class="post-metadata">

**Author:** ![ManishOjha](https://avatars.discourse-cdn.com/v4/letter/m/ecccb3/32.png) [@ManishOjha](https://discuss.aerospike.com/u/ManishOjha)\
**Post date:** [November 11, 2015, 6:07am UTC](https://discuss.aerospike.com/t/how-to-configure-2-nodes-in-a-cluster-so-they-communicate-with-each-other/2104/3 "2015-11-11T06:07:06Z")

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```auto
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Service Information~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Node Build Cluster Cluster Cluster Free Free Migrates Principal Objects Uptime
   . . Size Visibility Integrity Disk% Mem% . . . .
t 3.6.0 1 True True 0 99 (0,0) t 5.000 00:03:08
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Network Information~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Node Node Fqdn Ip Client Current HB HB
   . Id . . Conns Time Self Foreign
t *BB9E219BD565000 ***************.sciblr.in.ibm.com:3000 9.109.116.197:3000 5 184917806 1256 0
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Namespace Information~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Node Namespace Evictions Master Replica Repl Stop HWM Mem Mem HWM Stop
   . . . Objects Objects Factor Writes Disk% Used Used% Mem% Writes%
t bar 0 2.000 0.000 1 false 50 225.000 B 1 60 90
t ns1 0 1.000 0.000 1 false 50 108.000 B 1 60 90
t test 0 2.000 0.000 1 false 50 36.596 KB 1 60 90
Number of rows: 3

```

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<div class="post-metadata">

**Author:** ![kporter](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/kporter/32/515_2.png) [@kporter](https://discuss.aerospike.com/u/kporter)\
**Post date:** [November 12, 2015, 7:12pm UTC](https://discuss.aerospike.com/t/how-to-configure-2-nodes-in-a-cluster-so-they-communicate-with-each-other/2104/4 "2015-11-12T19:12:33Z")

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Hm two issues here,

1. I only see one node in this cluster
2. If a node hasn’t received an object belonging to a particular set then that set will not exist on that node. In other words, we do not synchronize the creation of sets across the cluster.

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<div class="post-metadata">

**Author:** ![ManishOjha](https://avatars.discourse-cdn.com/v4/letter/m/ecccb3/32.png) [@ManishOjha](https://discuss.aerospike.com/u/ManishOjha)\
**Post date:** [November 16, 2015, 6:24am UTC](https://discuss.aerospike.com/t/how-to-configure-2-nodes-in-a-cluster-so-they-communicate-with-each-other/2104/5 "2015-11-16T06:24:19Z")

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Thanks for the reply! Can you help me in configuring these nodes in a cluster. I am not sure what and how I should write aerospike.conf file. One example would help. I am using heartbeat (multicast but since I am new to aerospike world I am not sure how I should be configuring aersopike.conf file?

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<div class="post-metadata">

**Author:** ![kporter](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/kporter/32/515_2.png) [@kporter](https://discuss.aerospike.com/u/kporter)\
**Post date:** [November 16, 2015, 7:36pm UTC](https://discuss.aerospike.com/t/how-to-configure-2-nodes-in-a-cluster-so-they-communicate-with-each-other/2104/6 "2015-11-16T19:36:44Z")

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Many cloud environments do not permit multicast traffic, does your environment allow multicast? You can use [mtools](http://www.aerospike.com/docs/operations/troubleshoot/cluster/#validate-multicast) to verify your network’s ability to handle multicast.

You can find [heartbeat configuration examples here](http://www.aerospike.com/docs/operations/configure/network/heartbeat/).