Configuring Firewalls

Purpose

Guide engineers through configuring firewalls across host-based (iptables, nftables, UFW), cloud-based (AWS Security Groups, NACLs), and container-based (Kubernetes NetworkPolicies) environments with practical rule examples and safety patterns to prevent lockouts and security misconfigurations.

When to Use This Skill

Trigger Phrases:

• "Configure firewall for [server/service]"
• "Set up security groups for [AWS resource]"
• "Allow port [X] through firewall"
• "Block IP address [X.X.X.X]"
• "Set up UFW on Ubuntu server"
• "Create iptables/nftables rules"
• "Configure bastion host firewall"
• "Implement egress filtering"