Docker is an open source containerization platform that packages an application and all its dependencies together into a self-contained, portable container. The following are the basic concepts and advantages of Docker:
Basic concepts:
- Docker image: A Docker image is a file system that contains an application and all its dependencies. It can be used to create Docker containers.
- Docker container: A Docker container is a running instance of a Docker image. Containers are lightweight and portable and can be deployed and run in different environments.
- Docker repository: Docker repository is a place where Docker images are centrally stored and managed. You can use Docker Hub or a private Docker repository.
Advantages:
- Simplified application deployment: Using Docker, applications and all dependencies can be packaged together, simplifying the application deployment process.
- Improved application portability: Using Docker makes it easy to run applications in different environments, thereby improving application portability.
- Improved application security: Docker can improve application security by isolating the application and the host environment.
- Improve development efficiency: Using Docker can quickly create a development environment, improving development efficiency.
In application development, Docker can be used to manage the application's dependencies and running environment. Developers can use Docker to build independent development environments to ensure that applications have consistent running results across different development machines and teams. In addition, Docker can also be used for continuous integration and deployment, making the application development, testing and deployment process more efficient and reliable.