.. _concepts-clustering-considerations:

Clustering Considerations
-------------------------

The cluster contains multiple nodes which can be contained in separate firewalled networks.  

Network ports need to be opened on firewalls to allow inter-node communication – these are
described in more detail in the Platform Guide.

All communication between nodes is encrypted.

+-----------+--------------------------------------------------------------------------------------------+
| Node type | Ports                                                                                      |
+===========+============================================================================================+
| WebProxy  | 22 (ssh & sftp), 80 (http), 161 & 162 (snmp), 443 & 8443 (https)                           |
+-----------+--------------------------------------------------------------------------------------------+
| Unified   | 22 (ssh & sftp), 80 (http), 161 & 162 (snmp), 443 & 8443 (https), 27020 & 27030 (database) |
+-----------+--------------------------------------------------------------------------------------------+


* 22/ssh is used for remote administration
* 80 and 443 is used for the web server
* 161 and 162 are used for sending and receiving snmp
* 8443 is used for inter-cluster communication
* 27020 and 27030 is used for database queries and replication

.. |VOSS Automate| replace:: VOSS Automate
.. |Unified CM| replace:: Unified CM