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availability-group-multiple-network-interfaces.md

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author rwestMSFT
ms.author randolphwest
ms.date 01/21/2025
ms.service sql
ms.subservice linux
ms.topic include
ms.custom
linux-related-content

Considerations for multiple network interfaces (NICs)

When setting up high availability with servers that have multiple NICs, follow these suggestions:

  • Make sure the hosts file is set up so that the server IP addresses for the multiple NICs resolve to the hostname of the Linux server on each node.

  • When setting up the cluster using Pacemaker, using the hostname of the servers should configure Corosync to set the configuration for all of the NICs. We only want the Pacemaker/Corosync communication over a single NIC. Once the Pacemaker cluster is configured, modify the configuration in the corosync.conf file, and update the IP address for the dedicated NIC you want to use for the Pacemaker/Corosync communication.

  • The <hostname> given in the corosync.conf file should be the same as the output given when doing a reverse lookup (ping -a <ip_address>), and should be the short name configured on the host. Make sure the hosts file also represents the proper IP address to name resolution.

The changes to the corosync.conf file example are highlighted below:

  nodelist {
    node {
        ring0_addr: <ip_address_of_node1_NIC1>
        name: <hostname_of_node1>
        nodeid: 1
    }
    node {
        ring0_addr: <ip_address_of_node2_NIC1>
        name: <hostname_of_node2>
        nodeid: 2
    }
    node {
        ring0_addr: <ip_address_of_node3_NIC1>
        name: <hostname_of_node3>
        nodeid: 3
    }
  }