Created
March 10, 2026 06:22
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Setup UFW for app instance with Cloudflare DNS
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| #!/usr/bin/env bash | |
| set -e | |
| # Allow only Cloudflare to access HTTP/HTTPS using UFW | |
| CF_IPV4_URL="https://www.cloudflare.com/ips-v4" | |
| CF_IPV6_URL="https://www.cloudflare.com/ips-v6" | |
| SSH_PORT=22 | |
| echo "Installing ufw if missing..." | |
| apt-get update -y | |
| apt-get install -y ufw curl | |
| echo "Resetting firewall rules..." | |
| ufw --force reset | |
| echo "Setting default policies..." | |
| ufw default deny incoming | |
| ufw default allow outgoing | |
| echo "Allowing SSH..." | |
| ufw allow ${SSH_PORT}/tcp | |
| echo "Fetching Cloudflare IPv4 ranges..." | |
| for ip in $(curl -s $CF_IPV4_URL); do | |
| ufw allow proto tcp from $ip to any port 80 comment 'Cloudflare HTTP' | |
| ufw allow proto tcp from $ip to any port 443 comment 'Cloudflare HTTPS' | |
| done | |
| echo "Fetching Cloudflare IPv6 ranges..." | |
| for ip in $(curl -s $CF_IPV6_URL); do | |
| ufw allow proto tcp from $ip to any port 80 comment 'Cloudflare HTTP' | |
| ufw allow proto tcp from $ip to any port 443 comment 'Cloudflare HTTPS' | |
| done | |
| echo "Enabling firewall..." | |
| ufw --force enable | |
| echo "Firewall rules applied. Current status:" | |
| ufw status numbered |
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