Ravi Sir's Cards › AWS
firewalld vs security group
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
Read card text
What this card says
Where
firewalld
Inside the server.
security group
Outside, in the cloud.
Key points
Per host.
Per instance or ENI.
Example
firewall-cmd --list-all
Use when
Host rules.
Network edge.