Ravi Sir's Cards › AWS
ufw vs firewalld
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
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What this card says
Tool
ufw
Simple rules, Ubuntu.
firewalld
Zones, RHEL family.
Key points
Allow by port or app.
Needs --permanent and --reload.
Example
ufw allow 22/tcp
Use when
Single servers.
Many interfaces.