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How to Create a Proxmox Cluster?

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create a proxmox cluster

Cluster is a term used to combine 2 or more similar devices to become a single unit. So the proxmox cluster can be interpreted as merging 2 or more proxmox servers so that the 2 proxmox servers seem to be one unit. The advantages of using a cluster include centralized management using a web base and we can migrate live virtual machines to other nodes on proxmox.

 

Problem

How to create a proxmox cluster?

 

Solution

If you want to create a proxmox cluster then there are a few things to consider:

  • All nodes or servers must be in one network
  • Time on the proxmox server must be synchronized. As far as I know, the time on proxmox version 7 is controlled by the chrony application, and the application is installed by default in proxmox.
  • It is recommended to use the same server specifications

 

In this article I will create a proxmox cluster using 2 proxmox servers where:

Proxmox1 IP: 192.168.100.21
Proxmox2 IP: 192.168.100.22

and I made proxmox1 as master. Make sure the two proxmox servers have not created a virtual machine.

A. On Proxmox1

There are 2 ways to create a cluster in proxmox, namely using the web or the CLI.

1. Using Web

If you want to use the web, then click DataCenter > Cluster > Create Cluster as shown below:

Click the Create Cluster button

So there will be a pop-up display like in the image below:

Create a cluster name

Write the name of the cluster, select IP and click the Create button, then a pop-up will appear as below:

The process of creating a master cluster on proxmox

Wait until it says TASK OK and after that close the pop-up by clicking the cross in the upper right corner. After that press the Join Information button as shown in the image below:

Click the Join Information button

then a pop-up will appear as below:

Click the Copy Information button

2. Using CLI

If you want to use the CLI, then type the command in the following format:

pvecm create CLUSTERNAME

If you’re going to name ClusterProxmox then we type the command below:

pvecm create ClusterProxmox

 

to see the status of the cluster, then type the command below:

pvecm status

 

B.On proxmox2

Like on proxmox1, we can join the cluster using web or CLI.

1. Using Web

On proxmox 2 click DataCenter > Cluster > Join Cluster and select the Join Cluster button as shown in the image below:

Click the Join Cluster button

then there will be a pop-up like below:

Fill in the blank box from the previous copy

copy the information we just copied by right-clicking so that a pop-up will appear as shown below:

Write the password of the server

enter the proxmox1 server password and select the proxmox2 server IP and click the Join ‘ClusterProxmox’ button then the screen below will appear:

The process of joining the cluster

Close the pop-up by clicking the cross in the upper right corner.

1. Using CLI

If you want to use the CLI to join the proxmox cluster, then type the command format as follows:

pvecm add IP-ADDRESS-CLUSTER -link0 LOCAL-IP-ADDRESS-LINK0

In this case, we type the command below:

pvecm add 192.168.100.21 -link0 192.168.100.22

 

Type the master server password then if the password is correct then the clustering process in proxmox will start as shown below:

Join the cluster using CLI

 

After that type the command below to ensure that the clustering process is successfully created:

Check the status of the cluster

If you want to display how many nodes are on your cluster, type the below command:

pvecm nodes

Display all nodes on the proxmox cluster

C. Test Cluster

Refresh the proxmox1 web dashboard, it should look like this:

Display on proxmox1 dashboard

 

Likewise, refresh the proxmox2 web dashboard, then it should look like the image below:

Display on proxmox2 dashboard

It can be seen that the proxmox1 and proxmox2 dashboards have the same display and that means you have successfully created a cluster in proxmox. Then we try to test the cluster that we created earlier. Create a virtual machine on one of the nodes (servers) and point the storage to shared storage for example using TrueNAS. After the virtual machine is successfully installed, try migrating the virtual machine by clicking the migration button as shown below:

Migrate a virtual machine

then there will be a pop-up showing the migration progress of the virtual machine:

The migration progress of the virtual machine

Wait until the progress is complete and preferably when the migration process occurs, you ping the virtual machine to see if there is downtime or not on the virtual machine. When it is finished, the virtual machine should have been successfully moved to the proxmox2 node:

The VM moved to the proxmox2 node

 

Note

So that virtual machines can do live migration, we should use shared storage such as TrueNAS and so on so that the live migration process does not have problems. Please note that when we use a cluster on proxmox, we can only use live migration when each node in the proxmox cluster is on. If the node in the virtual machine dies, the virtual machine will not be able to move to another node and if we want the virtual machine to move when the node dies, we must turn on the high availability (HA) feature on proxmox.

 

References

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