VPC security groups example

A security group acts as a virtual firewall for the instance to control inbound and outbound traffic. Therefore, you must make sure that in cluster configuration, ports are enabled in the security groups so that the VMs can communicate with each others.

Consider an example with two VMs that uses two subnets:

Subnet 1: 172.17.1.0/24

Subnet 2: 172.17.2.0/24

With this setup, the following table describes the inbound rules for a security group.

This table indicates that the inbound traffic is allowed between the instances that are assigned to the security group.