Varnostne skupine so virtualni požarni zidovi, ki nadzorujejo dohodne in izhodne prometne tokove do AWS virov (kot so EC2 instance) — definirajući, kateri porti, protokoli in viri so dovoljeni. So temeljni za varnost omrežja AWS.
Kaj počnejo varnostne skupine
A SECURITY GROUP is a virtual firewall attached to resources (EC2, RDS, etc.):
→ INBOUND rules — what traffic can REACH the resource (port, protocol, source)
→ OUTBOUND rules — what traffic the resource can SEND OUT
→ only ALLOW rules (no explicit deny); everything not allowed is DENIED by default
→ STATEFUL — if inbound is allowed, the response is automatically allowed back
