Chapter 13. Creating a Container with an Application

Decide which base image to use.

Write a Dockerfile that describes the steps required to create the container.

Refer to the Dockerfile Reference for information about how to create a Dockerfile that includes your content, sets default commands to run, and opens necessary ports and other features.

This example shows a minimal Dockerfile that contains the my-program/ directory:

FROM registry.access.redhat.com/rhel7
USER root
ADD my-program/ .

Place this Dockerfile into the workspace directory.

Build a container image from the Dockerfile:

# docker build .
(...)
Successfully built container-id

During this step, note the container-id of the newly created container image.

Add a tag to the image to identify the registry where you want the container image to be stored. See Getting Started with Containers — Tagging Images.

# docker tag container-id registry:port/name

Replace container-id with the value shown in the output of the previous step.

Replace registry with the address of the registry you want to push the image to, port with the port of the registry (omit if not needed), and name with the name of the image.

For example, if you are running a registry using the docker-distribution service on your local system with an image named myimage, the tag localhost:5000/myimage would enable that image to be pushed to the registry.

Push the image to the registry so it can be pulled from that registry later.

# docker push registry:port/name

Replace the tag parts with the same values as the ones used in the previous step.

To run your own Docker registry, see Getting Started with Containers — Working with Docker registries.