Role of Docker in DevOps

Once you have the consistency kicking in, you can skip the time taking environment settings and let the fresh developers start any programming right away. Above all, Docker saves time for deployment documentation and preparation set up for the process. Docker introduced environment standardization by minimizing the inconsistency between different environments. It is a technology that makes the development environment repeatable, and companies can ensure that every team member is working in the same domain. Leading companies use Docker for development testing and production. Another reason for using Docker containers is its continuous integration and deployment ability.

Today we’re going to start out with just a standard Ubuntu 14.04 server, with nothing extra installed. Use Docker and Docker Compose to run the containerized application from Module 5. Use container registries such as Dockerhub to share and distribute container images.

What are Containers?

Above all, Docker composes configuration files so that each team member has access to create an environment of their own. Another fantastic fact about Dockers is that it is an open-source tool. Anyone can use it to meet their needs even if they want any additional feature or in case they want to add a part that does not exist in the application. After learning Docker basics, you will have a clear idea about how to use Docker. Package delivery of the application can keep the developer assured about the timely delivery of the application without being concerned about the type and configuration of the platform. In this way, application size gets reduced significantly, and at the time of shipping, application performance also gets improved.

Docker for DevOps Lessons

Developers can write code without worrying about the system that will be ultimately running the application. They can also use one of the thousands of programs that are developers have already developed to run in a Docker container. Docker projects play a pivotal role in enabling continuous integration and continuous deployment (CI/CD) practices. CI/CD aims to automate the entire software delivery process, from code changes to production deployment. This encapsulation ensures that applications run consistently across different environments and eliminates the notorious “dependency hell” problem. With Docker, updates and patches can be applied to containers without affecting the host system or other applications.

Some Advantages of DevOps

Image layers are created in read-only mode by executing each command in the Dockerfile. You begin with your base layer, which typically includes your base image and operating system, and then you add a layer of dependencies on top of that. These instructions are then placed in a read-only file that will become your Dockerfile. However, containers still incur performance overhead as a result of overlay networking, interfacing between containers and the host system, and so on.

  • On the other hand, containerization does not emulate low-level hardware devices and relies on the host operating system to create lightweight virtual machines called containers.
  • Also, you must be sure of the best DevOps implementation practices for assured outcomes.
  • For CI/CD process, a local development environment can be set up through Docker.
  • Using Docker essentially means having a good understanding of the most important commands that you will need to use in Docker.

Once a layer is created, it becomes immutable, meaning it can’t be changed. The layers of a Docker image are stored in the Docker engine’s cache, which ensures the efficient creation of Docker images. It accomplishes this by running each container independently while allowing the containers to interact with one another. The Docker registry is where you would host and distribute various types of images.

How do I know if learning Docker is right for me?‎

This lesson will help you understand these advantages, some basic requirements and specifications for installing Docker on windows, and a step-by-step guide to installing it on Windows. And finally, we have assignments to put your skills to the test. You will be given the challenge to solve using the skills you gained during this course. This is a great way to gain real-life project experience and work with the other students in the community to develop a Dockerfile and get feedback for your work. The assignment will push you to research and develop your own Docker images.

When it comes to efficiently building, running, managing, and distributing your applications. It is a promising platform that can make work easier for many DevOps. If you are considering adopting Docker, learning, and understanding its ecosystem will make it very easy for you to adopt it.