Configure a failover IP in OVHCloud | Guide

Learn how to configure a failover IP in OVHCloud. Our OVH Support team is here to help you with your questions and concerns.

Configure a failover IP in OVHCloud | Guide

Did you know that the failover IPs offered by OVHCloud lets the user associate multiple IP addresses with a single network interface?

3In fact, our experts recommend configuring failover IP addresses on their instances, like international services or hosting multiple websites.

Configure a failover IP in OVHCloud with a Debian 10 instance

Let’s take a quick look at how to configure a failover IP in OVHCloud with a Debian 10 instance:

1. To begin with, we have to disable automatic network configuration. So, open this file path:

   sudo nano /etc/cloud/cloud.cfg.d/99-disable-network-config.cfgCopy Code
2. Then, enter this line in the file:

   network: {config: disabled}Copy Code
3. Save the file and exit.
4. Now, moving on to editing the Network Configuration File. So, verify the network interface name with this command:

   ip aCopy Code
5. Then, open the network configuration file (/etc/network/interfaces.d/50-cloud-init) and add these lines:

   auto NETWORK_INTERFACE:ID
   iface NETWORK_INTERFACE:ID inet static
   address IP_FAILOVER
   netmask 255.255.255.255Copy Code
6. Now, it is time to restart the networking interface to apply the changes:

   sudo systemctl restart networkingCopy Code

Configure a failover IP in OVHCloud with Ubuntu 20.04 instance

Let’s take a look at how to configure a failover IP in OVHCloud with Ubuntu 20.04 instance:

1. To begin with, we have to disable automatic network configuration. So, open this file path:

   sudo nano /etc/cloud/cloud.cfg.d/99-disable-network-config.cfgCopy Code
2. Then, enter this line in the file:

   network: {config: disabled}Copy Code
3. Save the file and exit.
4. Now, moving on to editing the Network Configuration File. So, verify the network interface name with this command:

   ip aCopy Code
5. Then, open the network configuration file (/etc/netplan/cloud-init.yaml) and add the failover IP address as seen in this example:

   version: 2
   ethernets:
   NETWORK_INTERFACE:
   dhcp4: true
   match:
   macaddress: fa:xx:xx:xx:xx:63
   set-name: NETWORK_INTERFACE
   addresses:
   - IP_FAILOVER/32
   Copy Code

   Our experts would like to point out that the alignment of each element in this file is crucial.
6. Now, test the configuration with this command:

   sudo netplan tryCopy Code

   
   If everything works as expected, we can apply the following changes:
   

   sudo netplan applyCopy Code

Furthermore, we have to repeat this procedure for each failover IP address.

Setting up a new Failover IP on a dedicated server with Centos 8

1. First, identify the interface name with the ifconfig command.
2. Then, copy the original interface to a new interface with the cp command.
3. Now, modify the network interface values as seen here:

   DEVICE="enp3s0f0:1"
   BOOTPROTO=static
   IPADDR="xxx.xxx.xxx.xxx"
   NETMASK="255.255.255.255"
   BROADCAST="xxx.xxx.xxx.xxx"
   ONBOOT=YESCopy Code

   Please note that IPADDR and BROADCAST have the same IP.
4. Finally, reboot so that the new network configuration will take effect.

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Conclusion

In brief, our Support Experts demonstrated how to configure a failover IP in OVH.