--- title: "Platform | Redundancy | N3uron KB V1.22" slug: "platform-redundancy" description: "N3uron is an Industrial Edge Platform for DataOps that enables seamless integration between the industrial plant floor and business applications," updated: 2025-12-22T11:00:57Z published: 2025-12-22T11:00:57Z canonical: "docs.n3uron.com/platform-redundancy" --- > ## Documentation Index > Fetch the complete documentation index at: https://docs.n3uron.com/llms.txt > Use this file to discover all available pages before exploring further. # Redundancy ## Introduction Since **N3uron****'s******version 1.21, users can now easily deploy a redundant architecture. N3uron redundancy supports a 2-node system, meaning there are two copies of the running node. One node is the **Primary Node** and the other is the **Backup Node**. One important thing to remember about redundancy is that nodes do not have to be installed on the same type of operating system. This means that users can run the primary node on a Windows machine and install the backup node on a Linux machine. Note:To ensure proper redundancy, users must take the precaution of using the same versions of both the modules and bootstrap on both nodes. Additionally, it is recommended to set up redundancy with a dedicated connection between the two nodes exclusively for this purpose. For physical nodes, use a direct physical cable; for virtual machines, use a virtual switch. [Embedded object](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/redundancy-infographic-tzr-n3uron.svg) [Embedded content](https://www.youtube.com/embed/vamocXaR-YA?&list=PLS63jGt25U89IYn_HKvvxIYxDVGR_FWbh&wmode=opaque&rel=0) ## Node Communication Primary and backup nodes communicate over TCP/IP. Therefore, they must be able to see each other over the network through any firewalls that might be in place. ## Configuration As shown in the image below, the **Redundancy** configuration is applied in the corresponding section under **This node.** ![01-Redundancy-configuration](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/01-Redundancy-configuration.png) Configuration parameters are as follows: - **Mode:** - **Stand-alone:**Redundancy is disabled and this node runs in stand-alone mode.******** - **Redundant primary node:**Activates the redundancy. This node is always active when available.**** - **Redundant backup node:**Activates the redundancy. This node stays in standby mode while the primary is available. This node switches to active when the primary is unavailable. Once the primary is available again, it switches back to standby automatically. **Warning**The next time the nodes reconnect after the redundancy mode changes, the **primary**node will overwrite the **backup**node configuration and stored data. **** ### Redundant Primary Node![02-Primary-node](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/02-Primary-node.png) - **Own certificate:** Redundant nodes use encrypted communications. *Own certificate* is the certificate generated by this node to encrypt and authenticate these communications. Copy and paste this certificate into the redundant node's Remote certificate field. - **Remote certificate:** Redundant nodes use encrypted communications. This node generates a*remote certificate* to encrypt and authenticate these communications. Paste here the Own certificate generated by the other node. - **Agent:** - **Server:** - **TCP port:**TCP port used to listen for incoming connections from the backup node. The default value is 3002. The valid range is 1 to 65535. Make sure the port is not used by any other application on the same machine.**** - **Network Interface:**Specifies which network interface cards will be permitted for incoming connections.  For example: - **127.0.0.1******or **localhost** only allows connections from local applications. - **0.0.0.0**or **All interfaces**allows connections from all the network interfaces. - It's also possible to select the network interface by either entering its specific IP address or clicking on the button to the right of the**Network interface** field.Note:**Network selector helper** is available from **N3uron**version **1.21.11.**![RedundancyNICHelper](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/RedundancyNICHelper.png) - **Initial standby time:**When the primary node is unavailable, the backup node becomes active. Once the primary node is available again, it waits for the backup node to connect and synchronize all the data generated while the primary node was down. Initial standby time is the time the primary node waits for the backup node to connect before switching to active without data synchronization with the backup node, displayed in milliseconds. The default value is 1,0000ms. NoteIf the primary node fails to connect to the backup node before the configured standby time has elapsed, the primary node will automatically switch to active mode without carrying out data synchronization with the backup node. This could result in the loss of stored data, as well as any configuration changes that were made during the time the backup node was active. ### Redundant Backup Node![03-Backup-node](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/03-Backup-node.png) - **Own certificate:** Redundant nodes use encrypted communications. *Own certificate* is the certificate generated by this node to encrypt and authenticate these communications. Copy and paste this certificate into the redundant node's Remote certificate entry. - **Remote certificate:** Redundant nodes use encrypted communications. This node generates a*remote certificate* to encrypt and authenticate these communications. Paste here the Own certificate generated by the other node. - **Agent:** - **Connection:** - **Host:**Hostname or IP address to connect to the primary node.**** - **TCP port:**TCP port to connect to the primary node. The default value is 3002.**** - **Connection timeout:** Time to get a valid response from the primary node, displayed in milliseconds. The default value is 5000. - **Reconnect delay:**Time to reconnect after disconnection or a failed connection, in milliseconds. The default value is 1000. [Embedded content](https://www.youtube.com/embed/jtCjA-nxtVU?&list=PLS63jGt25U89IYn_HKvvxIYxDVGR_FWbh&index=2&wmode=opaque&rel=0) ### Historian Database Considerations In **N3uron**, whenever you create a Historian module instance, it will default to pointing to the MongoDB database embedded in the N3uron installer. However, internal databases are not synchronized, therefore an external database must be used for historical data storage. ![04-Database-Considerations](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/04-Database-Considerations.png) [Embedded content](https://www.youtube.com/embed/_w1MxEof6T8?&list=PLS63jGt25U89IYn_HKvvxIYxDVGR_FWbh&index=4&wmode=opaque&rel=0) ### Links Considerations When connecting a remote node to a redundant pair of nodes via [Links](/v122/docs/platform-links), it is necessary to utilize the [Redundancy Agent](/v122/docs/redundancy-agent) for configuring communications, as depicted in the images below. In this example, port 301 has been used. ![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/oKvGYZoYZv.png) The [Redundancy Agent](/v122/docs/redundancy-agent) module listens on a **local**port and forwards the incoming traffic to the redundant connections. Therefore, we must configure the Link to point at the **localhost** address and port we previously configured. ![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/chrome_ecA56dw5Wl(1).png) **Warning**Once the connection with the **Primary** node is established, it will be necessary to force a failover in order to manually trust the certificates for the **Backup** node.