Overview

IP Failover enables automatic reassignment of public IP addresses to standby virtual machines in the event of a failure, ensuring high availability and business continuity for your applications.

Key concepts

An IP failover group consists of the following components:

Members

• A shared (reserved, public) IP address that is assigned to all member NICs of the failover group.

• Enables communication to continue during a failure event.

• Multiple IP failover groups can be configured for different services.

• A server can be a member of multiple IP failover groups.

• Servers should ideally be distributed across different Availability Zones for redundancy

• Users must have access rights for the IP addresses they wish to use.

• Failover rules are managed at the operating system level using high-availability or fail-over configuration features.

Master

• Represents the primary node in the IP failover group during initial provisioning.

• Corresponds to the master of the HA setup on your virtual machines.

• Can be changed without needing to update the failover group configuration in the DCD.

Primary IP Address

• Can be configured as either the primary or additional IP address for the failover group.

• Recommended: Use the failover IP as the primary IP address, as it is used to calculate the gateway IP (beneficial for backup solutions).

• Note: This will replace any previously provisioned primary IP address.

• Limitation: When multiple IP failover groups exist on a LAN, a NIC can only be used once for a primary IP address across all groups (the DCD will alert you accordingly).