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I can successfully ping that external address so I know it is connecting to something. I can't find a configuration fix that will make it connect. refused to connect." Connecting to port 8080, I get "This site can’t be reached. Trying to connect from my laptop browser to that external IP, connecting to port 80 I get: "This site can't be reached. Now that I know the docker container is working and I can get to it (at least from within the instance and through that mysterious addr) how is it that GCE external IP addr is supposed to connect through the instance and to that container? The full output of iptables was: Chain PREROUTING (policy ACCEPT)ĭOCKER all - 0.0.0.0/0 0.0.0.0/0 ADDRTYPE match dst-type LOCALĭOCKER all - 0.0.0.0/0 !127.0.0.0/8 ADDRTYPE match dst-type LOCAL However, I charged forward and within the instance shell (outside the container) I ran Lynx connecting to that IP addr (172.17.0.7:80) and it connected to the osticket website! I'm assuming it connected to the container. After reading up on Docker networking I used this suggested iptables command on the instance (iptables -t nat -L -n) and discovered an IP address (172.17.0.7) whose purpose is a mystery to me: Chain DOCKER (2 references)ĭNAT tcp - 0.0.0.0/0 0.0.0.0/0 tcp dpt:8080 to:172.17.0.7:80 I can connect using Lynx from a bash shell running inside the container (lynx ).

I started up the Docker container as normal. My goal is to run a Docker container for osticket on that instance. There’s a couple of ways to do this, but the easiest way would be to connect over the IP address listed in your docker0 network adapter.I set up a Google Compute Engine (GCE) instance with an assigned static IP address. If that’s the case you would just use as your DB connection host. I often see this use case come up when people are beginning to move their stack over into using Docker. This could come in handy if you wanted to connect to a database that’s running on your host but isn’t running inside of a container.

Docker for Mac / Docker for WindowsĪs of Docker v18.03+ you can use the hostname to connect to your Docker host.

In Docker Tip #35 I wrote about connecting to your Docker host from inside of a container but a lot of things have changed since then.

Here's how to do it on Docker for Mac, Windows and Linux. Updated on July 27th, 2018 in #docker Docker Tip #65: Get Your Docker Host's IP Address from in a Container Once in a while you may need your Docker host's IP address.