CODEWITHSUNDEEP
dockerport
Nam G VU
Nam G VU

Reputation: 35424

Docker to run new container - list of all mapped ports?

When running a new container, we specify a port RUN_PORT:EXPOSED_PORT to map with the host machine. This will fail if RUN_PORT is already used.

So my question is how to list all the mapped port - so that we can pick up the port number out of the list.

p.s.

I'm using Ubuntu 16.04

Upvotes: 0

Views: 1872

Answers (2)

BMitch
BMitch

Reputation: 264851

Listing all tcp ports being used (for listening) can be seen with:

netstat -lnt

Looking up what is using a single port can be done with a netstat and grep, or if you have lsof installed:

sudo lsof -i :80 # shows the process using port 80

Starting a docker container on a random available port mapped to port 80 inside the container:

docker run -p 80 -n container_name your_container

Looking up what random port docker used in the above command on the host (this includes what IP interfaces it's attached to, or 0.0.0.0 for all interfaces, which is the default):

docker port container_name 80

Upvotes: 1

jz22
jz22

Reputation: 2658

Do the following command

sudo netstat -tlnp | grep ":RUN_PORT"

Replace RUN_PORT with the actual port to see which application is blocking it.

Upvotes: 2

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