Over time and business growth, majority online businesses tend to require more server resources. Ensuring high uptime is also very critical. To accomplish this, Proxmox cluster with fail-over setup helps.

But setting up clusters, configuring fail-over, performing IP updates, etc. may require changing the IP address of the existing Proxmox server that was set initially.

There may also be times you need to switch your IP blocks to another set, which usually happens during data center changes or network updates.

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In all these scenarios, the Proxmox server IP address will have to be changed to another IP. Today we’ll discuss how to change main IP address in Proxmox.

Steps to change IP address of Proxmox server

You can change the Proxmox node IP address in three simple steps as given here:

1. Lookup the current IP address in Proxmox console

To change IP address in Proxmox, go to the management console of Proxmox VE. You can access the console at https://IPaddress:8006/

You’ll see the server IP in the summary section.

Proxmox server IP address

To change the IP, go to the ‘proxmox node’ and choose option ‘Network’ and edit the ‘vmbr0’ section.

Edit ‘vmbr0’ to change IP address of Proxmox

2. Change the IP address of Proxmox node

Enter the new IP address in the ‘Edit’ window and click ‘OK’. Here we’re changing the IP address from 172.17.4.45 to 172.17.5.45.

The new IP address would be now shown in the ‘Network’ section:

New IP address shown in Proxmox

3. Change the IP address of Proxmox in hosts file

However, the above IP change will not yet reflect in the main Summary section. For that, we edit the ‘/etc/hosts’ file in the server and change the IP address.

Change Proxmox IP in /etc/hosts

Once the /etc/hosts is updated, Logout and Login to the Proxmox VE management console to see the new IP listed. If it doesn’t show, reboot the machine and check.

New Proxmox IP address in Summary

Today we saw the steps to easily change a Proxmox node IP address. To change the IP address, you need to first ensure that the new IP is available and bound to the server.

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The gateway and the network interface for the new IP address should be mentioned correctly after checking the details in the server. Otherwise you’d get errors while adding the IP.

The hostname and DNS changes should also be made in cases where they are applicable. If you’d like to know how to do it for your servers, we’d be happy to talk to you.