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docker
Govinda Malavipathirana
Govinda Malavipathirana

Reputation: 1131

docker container port command gives nothing

I ran a nginx container without specifying the host port.

docker container run -d --name engineone nginx

When I check the running containers it shows that container I ran.

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
d6b1d457b0b1        nginx               "nginx -g 'daemon of…"   About an hour ago   Up 58 minutes       80/tcp              engineone

Now I want to know which port has taken by the engineone container. So I ran..

docker container port engineone

But the output gives nothing. I have some knowledge in how docker networking works but I would like to know how is this possible. Does it really runs without host port?

Upvotes: 0

Views: 403

Answers (1)

Govinda Malavipathirana
Govinda Malavipathirana

Reputation: 1131

Done some research throughout the day, In docker docs..

By default, when you create a container, it does not publish any of its ports to the outside world. To make a port available to services outside of Docker, or to Docker containers which are not connected to the container’s network, use the --publish or -p flag. This creates a firewall rule which maps a container port to a port on the Docker host.

So in here docker won't assign a port util we tell it to do.

Upvotes: 1

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