Security Groups

Amazon Security Groups #

• Security Groups are the fundamental of network security in AWS
• They control how traffic is allowed in or out of our EC2 instances
• Security Groups only contain allow rules (as oppose to NACL or AWS Network Firewall)
• Security Groups rules can reference an IP or another Security Group
• Security Groups are acting as a “firewall” for EC2 instances

Security Groups scope #

• Access to Ports
• Authorized IP ranges - IPv4 and IPv6
• Control inbound network
• Control outbound network

Security Groups principals #

• Can be attached to multiple instances
• Locked down to a region / VPC combination
• Lives “outside” of an EC2 instance - if traffic is blocked, EC2 won’t see it
• It’s a good practice to maintain one separate SG for SSH access
• If application is not accessible (time out) then it’s a Security Group issue
• If application gives a “connection refused” error then it’s an application error or it’s not launched
• All inbound traffic is blocked by default
• All outbound traffic is allowed by default

» Sources « #

Full YouTube Rahul’s AWS Course: https://www.youtube.com/playlist?list=PL7iMyoQPMtAN4xl6oWzafqJebfay7K8KP

» Disclaimer « #