Setting up a Proxmox cluster on Elastic Metal servers using the Private Networks feature

• Proxmox
• Elastic-Metal
• KVM
• containers

Proxmox Virtual Environment (Proxmox VE) is a server virtualization platform, based on Debian Linux. It allows the deployment and management of KVM-based virtual machines or LXC containers. The tool provides a REST API as well as a graphical web interface to manage the virtual machines. It is also licensed under the GNU Affero General Public License, version 3.

Before you startLink to this anchor

To complete the actions presented below, you must have:

• A Scaleway account logged into the console
• Owner status or IAM permissions allowing you to perform actions in the intended Organization
• At least 2 Elastic Metal servers
• Created a Private Network and attached your Elastic Metal servers to it

Installing ProxmoxLink to this anchor

1. Select your Elastic Metal server by clicking on Elastic Metal in the Compute section of the side menu of the Scaleway console.
2. Choose the server you want to install from the list and click its name to see the server dashboard.
3. Click Install and select Proxmox VE 7 from the list of available images.
   
4. Enter your credentials. The service username is root. The service password must have eight characters minimum.
5. Enter a name and optional tags for your server.
6. Toggle the switch to enable the Private Networks feature for the server.
7. Click Install this Elastic Metal server to launch the installation.
   Note

   The installation of your Elastic Metal server may take up to one hour.

Accessing ProxmoxLink to this anchor

Once the server has rebooted, the Proxmox web interface is available.

1. Open a web browser and go to https://your_elastic_metal_server_ip:8006/. The Proxmox login screen displays.

2. Enter your credentials and click Login.

   Enter the credentials to log in:

   • User name: root
   • Password: The password set during the installation of Proxmox
   • Realm: Linux PAM standard authentication
   • Language: The display language of the Proxmox interface (i.e. English)

   The Proxmox dashboard displays.

Configuring the Private NetworkLink to this anchor

Instead of configuring the Private Network interface directly from your server’s command line, it is required to configure it using the Proxmox interface.

1. Click the Proxmox host in the data center menu on the left. The server’s dashboard displays.

2. Click Network in the System section of the menu. The network dashboard displays.

3. Click Create > Linux VLAN.

   

4. Enter the VLAN details for your Private Network:

   
   • Name: The name of your primary network interface followed by a dot and the VLAN ID of your Private Network (e.g. eno1.1918 for the primary network interface eno1 and the VLAN ID 1918)
   • (Optional) IPv4/CIDR: The private IP of your server will be configured through DHCP if IPAM is configured correctly. Optionally, set the IP address of the machine in your Private Network followed by its CIDR netmask (e.g. 192.168.1.101/24).
   • (Optional) Gateway (IPv4): The IP address of your Public Gateway, if you want to use one.
   • Autostart: Tick this box to automatically bring up the interface during system startup.

5. Click Create to create the Private Network interface.

6. Click Apply configuration to activate the Private Network and to save the configuration.

   Note

   Repeat the steps above on each node (in our case, each Elastic Metal server) you want to add to your Private Network.

Network configuration on the consoleLink to this anchor

1. Open the file /etc/network/interfaces in a text editor and update any lines generated by Proxmox. Change lines such as iface eno1.3010 inet manual to iface eno1.3010 inet dhcp.
2. In the same file, ensure that all lines generated by the Proxmox web UI are placed after the vmbr0 interface declaration. Failing to do so will prevent both static and DHCP configurations from working correctly.
3. Save the file and exit the text editor.
   • Example of a /etc/network/interfaces file:

   auto lo
   iface lo inet loopback
   iface eno1 inet manual
   iface eno2 inet manual
   iface eno3 inet manual
   iface eno4 inet manual
   auto vmbr0
   iface vmbr0 inet static
           address 51.159.111.2/24
           gateway 51.159.111.1
           bridge-ports eno1
           bridge-stp off
           bridge-fd 0
           hwaddress 44:a8:42:44:38:b4
   # generated configuration that must be after vmbr0 declaration
   auto eno1.3010
   iface eno1.3010 inet dhcp
   

   Note

   If you choose to use DHCP, note that no DHCP client process runs automatically on the newly added interface. To resolve this, either run dhclient on the interface manually or reboot the server.

Creating a clusterLink to this anchor

1. Click Cluster in the data center view of the Promox interface of your first node. The cluster dashboard displays.
   
2. Click Create cluster.
3. Enter a name for the cluster and select your Private Network as the cluster network. Then click Create.
   
4. Select the cluster in the list and click Join Information. The cluster join information displays.
   
5. Click Copy Information to copy the cluster join information into the clipboard.
6. Go to the Proxmox interface of your second node and click Cluster to enter the cluster configuration from the data center view of the machine.
7. Click Join cluster and paste the cluster join information in the form.
8. Enter your first node’s root password and click Join to link the machine to the cluster.
   

The second node appears now in the cluster in the Data center view of Proxmox. You can manage both machines using a single interface. The communication between members of the cluster is entirely in your Private Network, ensuring the highest level of security and the lowest latency.