This is just a simple method for adding fail over IPs to your Linux server at OVH. This works for both Linux VPS’s and dedicated servers.

Disable Network Config

This file won’t be crated by default and we’ll be creating it during the next step so lets open it in our editor (in my example I’ll be using nano).

sudo nano /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg

we’ll want to add the line below:

network: {config: disabled}

and then save and close the file (Ctrl+X, Y, Enter)

Check which interface our main IP is on

We want to figure out which interface we want to edit.

ip a

This is where the steps can start to vary depending on the distribution that you’re using.

Edit netplan in Ubuntu

Edit netplan cloud-init yaml configuration file (again we are using nano)

sudo nano /etc/netplan/50-cloud-init.yaml

By default mine looked like:

network:
    version: 2
    ethernets:
        ens3:
            dhcp4: true
            match:
                macaddress: fa:16:3e:d7:cb:28
            mtu: 1500
            set-name: ens3

but we want to update it to this, and spacing does matter in these files so I used the space key just to make sure that we lined up correctly.

network:
    version: 2
    ethernets:
        ens3:
            dhcp4: true
            match:
                macaddress: fa:16:3e:d7:cb:28
            mtu: 1500
            set-name: ens3
            addresses:
            - 158.69.114.73/32
            - 158.69.114.74/32
            - 158.69.114.137/32
            - 158.69.5.77/32

then save and close the file.

Now we want to test the changes to the netplan configuration (this is important as yaml formatting can cause issues):

sudo netplan try

If you didn’t get disconnected you should be good unless you see any other errors and you can either hit enter (I’d ping your IPs just to make sure they are working) or you can apply the netplan after the fact by running the following command.

sudo netplan apply

Edit Debian’s Cloud Init file

Open the file in your text editor (again I’m using nano).

sudo nano /etc/network/interfaces.d/50-cloud-init

add the following lines (using my example from my ubuntu box it would look something like this):

auto ens0:1
iface ens0:1 inet static
address 158.69.114.73
netmask 255.255.255.255

auto ens0:2
iface ens0:2 inet static
address 158.69.114.74
netmask 255.255.255.255

auto ens0:3
iface ens0:3 inet static
address 158.69.114.137
netmask 255.255.255.255

auto ens0:4
iface ens0:4 inet static
address 158.69.5.77
netmask 255.255.255.255

then save and close the file and restart networking

sudo systemctl restart networking

You can also do this on Windows or CenOS / RedHat variants.