Using Terraform, you may specify the security group that will be associated with the Elastic Network Interface (ENI) of an Amazon EC2 instance during provisioning using the vpc_security_group_ids argument and the security group ID.

The syntax for the vpc_security_group_ids argument is displayed below.

vpc_security_group_ids = [aws_security_group.security-group.id]

Using Terraform, you may configure a security group for an Amazon EC2 instance. The rule below will create an ingress rule that will allow all ICMP IPv4 traffic from any network.

As this is an example for education purposes, you may consider restricting the source IP address(es) in the cidr_blocks argument.

ingress {
description = “Allow all incoming ICMP – IPv4 traffic”
from_port = -1
to_port = -1
protocol = “icmp”
cidr_blocks = [“0.0.0.0/0”]
}