Learning Docker by Raj Pethuru & Chelladhurai Jeeva S. & Singh Vinod
Author:Raj, Pethuru & Chelladhurai, Jeeva S. & Singh, Vinod
Language: eng
Format: epub
Publisher: Packt Publishing
Published: 2015-06-28T16:00:00+00:00
Alternatively, you can apply the format option to the docker inspect subcommand in order to narrow down the output to very specific information. In this case, the ExposedPorts field of the Config object is shown in the following example:
$ sudo docker inspect --format='{{.Config.ExposedPorts}}' \ apache2 map[80/tcp:map[]]
To resume our discussion on the EXPOSE instruction, we can now spin up containers using an apache2 image, that we just crafted. Yet, the EXPOSE instruction by itself cannot create port binding on the Docker host. In order to create port binding for the port declared using the EXPOSE instruction, the Docker engine provides a -P option in the docker run subcommand.
In the following example, a container is launched from the apache2 image, which was rebuilt earlier. Here, the -d option is used to launch the container in the detached mode, and the -P option is used to create the port binding in the Docker host for all the ports declared, using the EXPOSE instruction in the Dockerfile:
$ sudo docker run -d -P apache2 fdb1c8d68226c384ab4f84882714fec206a73fd8c12ab57981fbd874e3fa9074
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