add multiple static ip addresses to a server with systemd-networkd

Question

We have a server with multiple IP adresses. Lately we migrated to systemd and we still need mutliple IPs on that server. With systemd-networkd we have some trouble finding a configuration example. so we use a bash script at the end of the boot process to add the ips to the interface.

Can someone provide a systemd-networkd config example for adding more than one IP to one interface.

Answer 1

According to systemd.network(5), you can simply add multiple Address= lines to the [Network] section, with the required addresses.

[Network]
Address=10.2.3.4/16
Address=10.6.7.8/16
Gateway=...

Alternatively, create a separate [Address] section for each address.

[Network]
Gateway=...

[Address]
Address=10.2.3.4/16

[Address]
Address=10.6.7.8/16

(The same applies to [Route] sections and Gateway= parameters.)

Note that systemd-networkd is still very new and receives bug fixes almost daily. Make sure you're using the latest systemd release, and test the Git builds if possible. See the mailing list and the IRC channels #systemd & #gentoo-systemd on freenode in case of bugs.

Answer 2

I'm using a container under Proxmox, and Proxmox writes its own /etc/systemd/network/eth0.network in the container. To get around not being able to rely on that file not being overwritten, you can create a drop-in file with the additional IP address(es), /etc/systemd/network/eth0.network.d/additional-ips.conf

[Match]
Name = eth0

[Address]
Address = 192.168.1.102/24

Answer 3

Using Arch Linux, SystemD 249.2-1, none of these (3) methods work (tried this answer too)

-------------------------
[Network]
Address=10.2.3.4/16
Address=10.6.7.8/16
-------------------------
[Network]
Address=192.168.59.1/24 192.168.1.5/24
-------------------------
[Address]
Address=10.2.3.4/16

[Address]
Address=10.6.7.8/16
-------------------------

Instead, using a simple SystemD service, you can set a second IP after boot... See this answer for more details on systemd service creation... Bonus point: this method allows you to have static or DHCP for the primary address.

• touch /usr/local/bin/second_ip
• chmod +x /usr/local/bin/second_ip
• edit file as per below

#!/bin/bash
ip address add 10.10.128.128/16 dev eth0

• touch /etc/systemd/system/second-ip.service

• edit file as per below

• systemctl enable second-ip

   [Unit]
   Description=second ip service
   After=network.target
  
   [Service]
   User=root
   ExecStart=/usr/local/bin/second_ip                                                                                      Type=simple
  
   [Install]
   WantedBy=multi-user.target