bash script to create a conf file for using cloudflare proxy ip with nginx based on https://serverfault.com/questions/754481/nginx-geoip-behind-cloudflare-proxy-showing-wrong-country-not-of-end-user-but and https://danielmiessler.com/p/getting-real-ip-addresses-using-cloudflare-nginx-and-varnish

cloudflare_ips.sh

#!/bin/sh
# /etc/nginx/geoip_update.sh
# Update GeoIP proxy list to the current list of cloudflare IP addresses

outfile=$(dirname "$0")/cloudflare_proxy_ips.conf

echo "# Auto-generated by $0" > "$outfile"
(
    curl https://www.cloudflare.com/ips-v4
) | while read ip; do
    echo "set_real_ip_from $ip;"
done >> "$outfile"
(
    curl https://www.cloudflare.com/ips-v6
) | while read ip; do
    echo "set_real_ip_from $ip;"
done >> "$outfile"
echo "real_ip_header CF-Connecting-IP;" >> "$outfile"
echo List updated.