I am writing a dockerfile and I need IPtables to be installed in docker container. I need to add a rule to the IP table as I am trying to run on "host" network mode and it seems I need install IPtables for this purpose. when I try to include the rule as follows I get the following error.
iptables -I INPUT -p tcp -m tcp --dport 8080 -j ACCEPT
iptables v1.6.0: can't initialize iptables table `filter': Permission denied (you must be root)
Perhaps iptables or your kernel needs to be upgraded.
Is it possible to run iptables with root privileges.
--privileged flag is not required anymore.
Starting with Docker 1.2 you can now run your image with parameters --cap-add=NET_ADMIN and --cap-add=NET_RAW which will allow internal iptables.
Google to the rescue.
TLDR version:
docker run --privileged