CODEWITHSUNDEEP
docker
painotpi
painotpi

Reputation: 6996

How to connect to docker host?

I'm a bit confused about "what" a docker host is and how is it different from my system in itself.

I did the following,

docker run jenkins

/* in a new tab */
docker ps // to get the container id
docker inspect {container-id} // to get the IP

From what I understand the only way I can connect to the container's IP is from within the docker host (if I don't port map that is) - so how do I connect to the host?

I know I can bash into the container and curl the IP I got from inspect, but that's not the same as connecting to the docker host, is it?

Upvotes: 0

Views: 60

Answers (1)

robsiemb
robsiemb

Reputation: 6374

The way you are using the term "docker host" here makes it sound like you are using the term to refer to the container itself. (You might also be referring to the physical machine which the container is running on).

You can think of the container as basically a very lightweight VM -- it has its own filesystem, network, possibly CPU and RAM resources, etc. So, without configuring the network, the container will be isolated. This analogy isn't perfect for any number of reasons, but its pretty close to what is going on.

Put another way, without port mapping (or "host networking", see this page for more details about docker networking), you can, as you discovered, only access the network within the container unless you map the ports (or, perhaps, are inside of a different container which is connected to the same bridge network).

In this case, you are probably just best off mapping the port so that you can access the service running inside the container.

Upvotes: 2

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