Ubuntu and Docker - How to Check Used and Available Ports With Netstat

Docker containers which are using the network of the host (the machine Docker runs on) will also need to share the ports of the host with each other.

So when creating a new container you will first have to make a choice whether:

  1. You want to use a macvlan network with its own IP address
  2. Or you want to use the ports of the host


I run the following on the CLI of my Ubuntu VM. After running, check in the list whether a port is in use or not:

sudo netstat -tulpen

Net Tools may still need to be installed:

sudo apt-get update
sudo apt install net-tools

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