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Ruby Dockerized App

Building a Dockerized App

Ruby Dockerized app uses Dockerfile for deployment.

Introduction to Dockerizing a Ruby Application

Dockerizing a Ruby application involves creating a Docker container, which provides a consistent environment for your app. This helps simplify deployment and ensures that your app runs the same way across different environments. In this guide, we will walk through the steps to create a Dockerfile for a Ruby application.

Setting Up Your Ruby Application

Before dockerizing your Ruby app, ensure that your application is set up correctly. This includes having your Gemfile and Gemfile.lock prepared with all required gems. Here’s a simple Ruby application setup:

Once your Gemfile is ready, run bundle install to generate the Gemfile.lock file.

Creating the Dockerfile

The Dockerfile is a text file that contains a series of instructions on how to build a Docker image for your application. Here’s a basic Dockerfile for a Ruby application:

Let's break down what each line of the Dockerfile does:

  • FROM ruby:3.0: This line sets the base image to Ruby 3.0.
  • WORKDIR /app: This sets the working directory inside the Docker container.
  • COPY Gemfile* ./: Copies your Gemfile and Gemfile.lock into the working directory.
  • RUN bundle install: Installs the Ruby dependencies.
  • COPY . .: Copies the rest of your application code into the working directory.
  • CMD ["ruby", "your_app_file.rb"]: Specifies the command to run your application.

Building and Running the Docker Container

With your Dockerfile ready, you can now build and run your Docker container. Use the following commands in your terminal:

The docker build command creates a Docker image from your Dockerfile, while the docker run command starts a container from the image and maps port 4567 on your host to port 4567 in the container, assuming your app runs on this port.

Conclusion

Dockerizing a Ruby application streamlines the deployment process and ensures consistency across different environments. By following these steps, you can easily create a Docker container for your Ruby app and deploy it with confidence.

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