iptables-chain-whitelist-example.sh

#!/bin/bash -xe

apt-get install iptables{,-persistent}

iptables -N node-exporter
iptables -A node-exporter -s 1.1.1.1 -j ACCEPT
iptables -A node-exporter -s 1.0.0.1 -j ACCEPT
iptables -A node-exporter -s 8.8.8.8 -j ACCEPT
iptables -A node-exporter -s 127.0.0.0/8 -j ACCEPT
iptables -A node-exporter -j REJECT

iptables -A INPUT -p tcp --dport 9100 -j node-exporter
iptables-save > /etc/iptables/rules.v4