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florian-h05/docker-iptables-fix.md

Forked from pedrolamas/docker-iptables-fix.sh
Last active September 26, 2023 17:01
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Script to fix Docker iptables on Synology NAS
Raw
docker-iptables-fix.md

Instructions

  • Open DSM on your Synology NAS
  • Save the above file to your Synology NAS
  • Open Control Panel and click on Task Scheduler
  • Click Create button -> Triggered Task -> User defined script
  • Give it a name, select "root" for User and "Boot-up" for Event, tick Enabled
  • Click Task Settings, paste "bash /volume1/path to script" on the User-defined script
  • Click OK button and you're done! The script will run after every reboot and should survive any updates of DSM!

More info

Please check the following post:

https://www.pedrolamas.com/2020/11/04/exposing-the-client-ips-to-docker-containers-on-synology-nas/

Raw
docker-iptables-fix.sh
#!/bin/bash
currentAttempt=0
totalAttempts=10
delay=15
while [ $currentAttempt -lt $totalAttempts ]
do
currentAttempt=$(( $currentAttempt + 1 ))
echo "Attempt $currentAttempt of $totalAttempts..."
result=$(iptables-save)
if [[ $result =~ "-A DOCKER -i docker0 -j RETURN" ]]; then
echo "Docker rules found! Modifying..."
iptables -t nat -A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
iptables -t nat -A PREROUTING -m addrtype --dst-type LOCAL ! --dst 127.0.0.0/8 -j DOCKER
echo "Done!"
break
fi
echo "Docker rules not found! Sleeping for $delay seconds..."
sleep $delay
done
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