I am reading a lot these days about how to setup and run a docker stack. But one of the things I am always missing out on is how to setup that particular containers respond to access through their domain name and not just their container name using docker dns.
What I mean is, that say I have a microservice which is accessible externally, for example: users.mycompany.com, it will go through to the microservice container which is handling the users api
Then when I try to access the customer-list.mycompany.com, it will go through to the microservice container which is handling the customer lists
Of course, using docker dns I can access them and link them into a docker network, but this only really works for wanting to access container to container, but not internet to container.
Does anybody know how I should do that? Or the best way to set that up.
How to Name a Docker Container. You can assign memorable names to your docker containers when you run them, using the --name flag as follows. The -d flag tells docker to run a container in detached mode, in the background and print the new container ID.
--dns=IP_ADDRESS Add the DNS server to the /etc/resolv. conf of the container and let the container use this server to resolve all hostnames that are not in /etc/hosts . --dns-search=DOMAIN sets the search domain of the container. When the search domain is set to .
When you connect an existing container to a different network using docker network connect , you can use the --ip or --ip6 flags on that command to specify the container's IP address on the additional network. In the same way, a container's hostname defaults to be the container's ID in Docker.
So, you need to use the concept of port publishing, so that a port from your container is accessible via a port from your host. Using this, you can can setup a simple proxy_pass from an Nginx that will redirect users.mycompany.com
to myhost:1337
(assuming that you published your port to 1337
)
So, if you want to do this, you'll need to setup your container to expose a certain port using:
docker run -d -p 5000:5000 training/webapp # publish image port 5000 to host port 5000
You can then from your host curl your localhost:5000
to access the container.
curl -X GET localhost:5000
If you want to setup a domain name in front, you'll need to have a webserver instance that allows you to proxy_pass your hostname to your container.
i.e. in Nginx:
server { listen 80; server_name users.mycompany.com; location / { proxy_pass http://localhost:5000; } }
I would advise you to follow this tutorial, and maybe check the docker run reference.
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