Alternatives to iptables on CircleCI 2.0

@halfer so as I understand it, if I use machine as my executor, I can’t use a custom image which means my builds will also need to run any custom installations in addition to bundle or package installations. Is that correct? I’m a noob with docker-compose but in theory, I should be able to run this locally to verify that the configuration works, which would be useful.

I’ll try these out. THANKS!