What is Docker in DevOps? Why it is used?
Docker is a containerization platform that packages your application and all its dependencies together in the form of a docker container to ensure that your application works seamlessly in any environment. Docker is a set of the platform as a service (PaaS) products that use OS-level virtualization to deliver software in packages called containers.
What is a docker used for?
Docker is a tool designed to make it easier to create, deploy, and run applications by using containers. Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and deploy it as one package.
- When developers write code locally and share their work with their colleagues using Docker containers.
- They use Docker to push their applications into a test environment and execute automated and manual tests.
- When developers find bugs, they can fix them in the development environment and redeploy them to the test environment for testing and validation.
- When testing is complete, getting the fix to the customer is as simple as pushing the updated image to the production environment.
Let’s understand what is a docker with an example?
Suppose an XYZ company needs to develop a Java Application. In order to do so, the developer will set up an environment with a tomcat server installed in it. Once the application is developed, it needs to be tested by the tester. Now the tester will again set up a tomcat environment from scratch to test the application. Once the application testing is done, it will be deployed on the production server. Again the production needs an environment with tomcat installed on it so that it can host the Java application. If you see the same tomcat environment setup is done thrice. There are some issues that I have listed below with this approach:
Now, I will show you How Docker containers can be used to prevent this loss.
However, in this case, the developer will create a tomcat docker image (An Image is nothing but a blueprint to deploy multiple containers of the same configurations) using a base image like Ubuntu, which is already existing in Docker Hub (the Hub has some base images available for free).
Now this image can be used by the developer, the tester, and the system admin to deploy the tomcat environment. This is how this container solves the problem.
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