- Docker on Windows
- Elton Stoneman
- 272字
- 2021-07-02 19:53:22
Summary
In this chapter, I took a closer look at Docker images and containers. Images are packaged applications, and containers are instances of an application, run from an image. You can use containers to do simple fire-and-forget tasks, you can work with them interactively, or have them running in the background. As you start to use Docker more, you'll find yourself doing all three.
The Dockerfile is the source to build an image. It's a simple text file with a small number of instructions to specify a base image, copy files, and run commands. You use the Docker command-line tool to build an image, which is very easy to add as a step to your CI build. When a developer pushes code that passes all the tests, the output of the build will be a versioned Docker image, which you can deploy to any host knowing that it will always run in the same way.
I looked at a few simple Dockerfiles in this chapter, and finished with a real-world application. NerdDinner is a legacy ASP.NET MVC app that was built to run on Windows and IIS. Using multi-stage builds I packaged that legacy app into a Docker image and ran it in a container. This shows that the new model of compute that Docker offers isn't just for greenfield projects using .NET Core and Nano Server - you can migrate existing apps to Docker and put yourself in a good place to start modernizing them.
In the next chapter, I'll use Docker to modernize the architecture of NerdDinner, breaking features out into separate components and using Docker to plug them all together.
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