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Forward a new host port to a running docker container.
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#!/bin/bash | |
# Add a firewall NAT rule to expose a port open in a docker container, on a host. | |
# | |
# This is only really useful if the container is already running, and you don't | |
# want to/can't shut it down, but need a new incoming port open. | |
# | |
# Requires `jq` for parsing docker container information. | |
# | |
# 2019 @leonjza | |
ACTION=$1 | |
CONTAINER_NAME=$2 | |
CONTAINER_PORT=$3 | |
if ! [[ "$ACTION" =~ ^(-A|-C|-D)$ ]] || [ -z "$CONTAINER_NAME" ] || [ -z "$CONTAINER_PORT" ]; then | |
echo "Usage: $0 [action] [container name] [port]" | |
echo " Actions can be -A (add rules); -C (check rules); -D (delete rules)" | |
exit | |
fi | |
CONTAINER_IP=$(docker inspect nc-container | jq -r ".[0].NetworkSettings.IPAddress") | |
DOCKER_INTERFACE=docker0 # not sure if this is standard, but ok | |
echo "Will $ACTION rules for $CONTAINER_PORT to $CONTAINER_IP for container $CONTAINER_NAME..." | |
iptables -t nat $ACTION POSTROUTING --source $CONTAINER_IP --destination $CONTAINER_IP -p tcp --dport $CONTAINER_PORT -j MASQUERADE | |
iptables -t nat $ACTION DOCKER ! -i $DOCKER_INTERFACE -p tcp --dport $CONTAINER_PORT -j DNAT --to-destination $CONTAINER_IP:$CONTAINER_PORT | |
iptables $ACTION DOCKER ! -i $DOCKER_INTERFACE -o $DOCKER_INTERFACE --source 0.0.0.0/0 --destination $CONTAINER_IP -p tcp --dport $CONTAINER_PORT -j ACCEPT | |
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