Change IP Address on Proxmox Backup Server (PBS)

1. Update Network Interfaces

Edit the main network configuration file to set your new IP, subnet mask, or gateway:

nano /etc/network/interfaces

Apply changes with systemctl restart networking or a reboot.

2. Update Hosts File

Critical for local name resolution. Ensure the new IP is mapped to your hostname:

nano /etc/hosts

3. Update DNS (Optional)

If your DNS server has also changed, update it here or through the PBS Web UI:

nano /etc/resolv.conf

4. Update Login Greeting (Optional)

If you want the terminal login screen (MOTD) to display the correct new IP, update this file:

nano /etc/issue

Quick Tip: After the change, don’t forget to update the storage remote IP on your Proxmox VE nodes so they can find the backup server at its new address!

Reference: Proxmox Support Forum