Mastering Proxmox - Third Edition

Security groups

This allows the grouping of several firewall rules into one rule. This is very helpful when the same multiple rules apply to several VMs. For example, we can create a Security Group named webserver and add multiple rules to open ports, such as 21, 22, 80, 443, and so on. Then, we can apply these security groups to any VMs used as a webserver. Similarly, we can create a Security Group to open ports for servers for emails only. The following screenshot shows an example of a webserver Security Group with rules to open ports for FTP, SSH, HTTP, and HTTPS:

It should be noted that security groups are only created in Datacenter zones. ...