Docker network mode host port mapping pro#
Since I'd like to access the MySQL database externally (from Sequel Pro via SSH tunneling), I'm going to use port 33306 on the host machine. In my scenario, I wanted to temporarily connect to MySQL running in a container, and since other application containers are linked to it, stopping, reconfiguring, and re-running the database container was a non-starter. Anyway, this answer is a detailed version of answer, but in more depth for new users. This is a solution up-to-date as of February 2016, using Docker 1.9.1. I had to deal with this same issue and was able to solve it without stopping any of my running containers.
to attach your container directly to the host's network interfaces (i.e., net is not namespaced) and thus all ports you open in the container are exposed. With docker 0.11? you can use docker run -net host. With 0.6.5, you could use the LINKs feature to bring up a new container that talks to the existing one, with some additional relaying to that container's -p flags? (I have not used LINKs yet.) NOTE: this is subverting docker, so should be done with the awareness that it may well create blue smoke.Īnother alternative is to look at the (new? post 0.6.6?) -P option - which will use random host ports, and then wire those up.
One way you can work this out is to setup another container with the port mapping you want, and compare the output of the iptables-save command (though, I had to remove some of the other options that force traffic to go via the docker proxy). To expose the container's port 8000 on your localhost's port 8001: iptables -t nat -A DOCKER -p tcp -dport 8001 -j DNAT -to-destination 172.17.0.19:8000 Internally, Docker shells out to call iptables when you run an image, so maybe some variation on this will work. If you have a container with something running on its port 8000, you can run wget To get the container's IP address, run the 2 commands: docker psĭocker inspect container_name | grep IPAddress You cannot do this via Docker, but you can access the container's un-exposed port from the host machine.
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