How To Use Docker for Development?

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How To Use Docker for Development?

In this article you learn the ways you can use Docker for Application development.

In this article you learn the ways you can use Docker for Application development.

Docker for Developers - How To Use Docker for Development?

It is always an experience to use Docker for development.  Generally, It’s not much different than the normal way to do development work through Docker. Developer should keep only two things in consideration in dealing with Docker.

1. All the dependencies should be there  in the working directory including  code.
2. One needs to change the build and he should go on with the commands to run inside a  Docker container.

Let us examine the process below with at least two setups with different languages.

How to use Docker for Development?

Docker to run Ruby applications

Here is the example of  Hello World operating  in Ruby. It does not  need to  install Ruby  to run this.
At first Developer should copy the required code  and then to  put it in a file called hello.rb.
Now  it is ready for a run .

"Hello Ruby!" is almost a universally usable command that one use for almost everything and everywhere . Next step is followed by an addition of  a dependency . It does not need  to install the dependencies into the container.

Then the user copies this into Gemfile:

Again  hello.rb  needs  a change to be hello-world.

If  bundle install is used to install the gems, there  ruby hello.rb is also operable.  But it will be unable to  run inside the Docker container,  since iron_mq gem is not there  inside the container. The installation of  this inside the container may have a certain uncontrollable  ramifications . Ephemeral containers are always desirable. Developer is always ensconced in  vendoring his  dependencies and loves to keep all  code and dependencies  together in a nice little package.

After installing the dependencies into the working directory , if there is a need to compile native extensions that can be done on the right architecture.
It  needs one more change  to use the new bundle hello.rb. One can notice a "require_relative"  line at the top.  Developer now run it again with its new dependency. This is how the things happen.
One can run it on a different version of Ruby, like Ruby 1.9. Only it seeks for a different container.

Web apps

The first step to make a web app is  to open ports.  The developer just delivers   the -p PORT:PORT flag to docker run.

Now it is time to copy the code into webapp.rb.

Here needs an addition of  gem 'sinatra' to the  Gemfile. It is now all set for a run with bundle install command again. It leads to run a new integrated command.  Therefore, the Developer is now prepared for a check of the whole work at http://localhost:8080.

Conclusion

From the above two work flows of two different apps processed through Docker it is  clear that most of these things  are common so far the application is concerned in both  the narrative , with some minor differences. It also evident that it doesn't change the development process too much and it can offer many benefits during the development pathway. It follows almost a common road with some minor differences while developing the apps in other languages as well.  Developers love Docker for its ease of doing business.

Visit our following sections of Docker tutorial:

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