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How To Make A Docker File

Image: Jack WallenWith Docker images, you can easily deploy containers without having to worry about maintaining the same overhead required by virtual machines. These containers can be pulled from the with ease, for easy use. Let's say, for example, you want to pull down the latest Ubuntu image for development purposes. However, before you start development, there are a number of changes you need to make to the image (such as updating, upgrading, and adding the build-essential package to the mix). Now, what if you plan on needing that same customized image for a number of development projects?

  1. Docker Delete File
  2. Create And Run Dockerfile
How To Make A Docker File

You could always pull the latest Ubuntu image and then manually run the commands to update, upgrade, and install build-essential. Must-Read Cloud.Or you could make use of Dockerfiles.

Docker Delete File

We are excited that you want to learn Docker. The Docker Get Started Tutorial teaches you how to: Set up your Docker environment (on this page) Build an image and run it as one container; Scale your app to run multiple containers; Distribute your app across a cluster; Stack services by adding a backend database; Deploy your app to production; Docker concepts. How can the answer be improved?

Create And Run Dockerfile

File

A Dockerfile is a file used to build a Docker image to your specifics. With a Dockerfile constructed, you could then easily build the same image over and over, without having to walk through the process manually.I want to show you how to craft a Dockerfile so you can make the process of building a specific image a no-brainer.

The image we will create is as described above: The latest image of Ubuntu, updated and upgraded, and with the build-essential package installed. This will be a fairly simple example of how Dockerfiles are used. The basicsThe first thing you need to know is that the Dockerfile is a text file, named Dockerfile, that contains commands. The first thing we're going to do is create a new directory to work within; so open a terminal window and issue the command mkdir /mydockerbuild.

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Change into that newly created directory with the command cd /mydockerbuild. Now we create our Dockerfile with the command nano Dockerfile and add the following contents: FROM ubuntu:latestMAINTAINER NAME EMAILRUN apt-get -y update && apt-get -y upgrade && apt-get install -y build-essentialWhere NAME is the name to be used as the maintainer and EMAIL is the maintainer's email address.Save and close that file. Building the imageNow we build an image from our Dockerfile. This is run with the command (by a user in the docker group): docker build -t 'NAME:Dockerfile'.Where NAME is the name of the image to be built.Say I want to build multiple images from this Dockerfile, one for web development, app development, and security development. I could build them with the following commands: docker build -t 'webdev:Dockerfile'.docker build -t 'appdev:Dockerfile'.docker build -t 'secdev:Dockerfile'.Do note the trailing period is necessary for each command.Once the build completes, you can issue the command docker images to see all of your newly created images ( Figure A).Figure A. All of my docker images conveniently listed.And that is all there is to using Dockerfiles.

How To Make A Docker File

Granted, this is a very simplistic illustration, but it will give you the springboard by which you can create more complicated Dockerfiles and docker images. Find out moreFor more information on building and using Dockerfiles, I recommend reading from the official docker support page. Docker containers are a very powerful and flexible way to expand your devops and even the services and applications your company offers. Give Dockerfiles a try and see if they don't make the creation of images significantly more efficient.