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Re-create docker iptables rules
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#!/bin/bash | |
echo "Recreating docker iptables rules and chains" | |
echo "iptables -N DOCKER" | |
echo "iptables -N DOCKER-ISOLATION" | |
echo "iptables -t nat -N DOCKER" | |
echo "iptables -A DOCKER-ISOLATION -j RETURN" | |
echo "iptables -A FORWARD -j DOCKER-ISOLATION" | |
echo "iptables -t nat -A PREROUTING -m addrtype -dst-type LOCAL -j DOCKER" | |
echo "iptables -t nat -A OUTPUT ! -d 127.0.0.0/8 -m addrtype -dst-type LOCAL -j DOCKER" | |
for network in $(docker network ls -f 'driver=bridge' --format '{{.Name}}'); do | |
iface=$(docker network inspect "${network}" -f '{{range $n, $iface := .Options}}{{if eq $n "com.docker.network.bridge.name"}}{{$iface}}{{end}}{{end}}') | |
echo "iptables -A INPUT -i ${iface} -j ACCEPT" | |
echo "iptables -A FORWARD -o ${iface} -j DOCKER" | |
echo "iptables -A FORWARD -o ${iface} -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT" | |
echo "iptables -A FORWARD -i ${iface} ! -o ${iface} -j ACCEPT" | |
echo "iptables -A FORWARD -i ${iface} -o ${iface} -j ACCEPT" | |
echo "iptables -t nat -A DOCKER -i ${iface} -j RETURN" | |
for container in $(docker network inspect bridge -f '{{range $name,$trash := .Containers}}{{$name}}{{"\x0a"}}{{end}}'); do | |
if [ -z "$container" ]; then | |
continue | |
fi | |
address=$(docker inspect "${container}" -f '{{.NetworkSettings.Networks.'"$network"'.IPAddress}}'); | |
if [ "$address" == "<no value>" ]; then | |
continue | |
fi | |
echo -ne "# $container" | |
docker inspect "${container}" -f '{{$addr:=.NetworkSettings.Networks.'"$network"'.IPAddress}}{{range $dport, $maps := .NetworkSettings.Ports}}{{$ddport := split $dport "/"}}{{range $index,$map := $maps}}{{if ne $map.HostIp "::"}}{{"\x0a"}}iptables -A DOCKER -p {{index $ddport 1}} ! -i '"$iface"' -o '"$iface"' -d {{$addr}} --dport {{index $ddport 0}} -j ACCEPT {{"\x0a"}}iptables -t nat -A DOCKER ! -i '"$iface"' -p {{index $ddport 1}} --dport {{$map.HostPort}} -d {{$map.HostIp}} -j DNAT --to-destination {{$addr}}:{{index $ddport 0}}{{end}}{{end}}{{end}}' | |
done | |
docker network inspect "${network}" -f '{{$f:=.}}{{range $n, $iface := .Options}}{{if eq $n "com.docker.network.bridge.name"}}{{range $i, $cfg := $f.IPAM.Config}}iptables -t nat -A POSTROUTING ! -o {{$iface}} -s {{$cfg.Subnet}} -j MASQUERADE{{"\x0A"}}{{end}}{{end}}{{end}}' | |
done |
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