Docker is an open source software that creates containers at the operating system level to easily distribute and deploy applications across different platforms. The following are the basic concepts and advantages of Docker:
basic concept:
- Image: A Docker image is a file that contains all the instructions and application code for creating a container.
- Container: A Docker container is a running instance of an image, including an application and all required dependencies.
- Warehouse: Docker warehouse is a place where images are saved and can be used to share and distribute images.
Advantage:
- Rapid deployment: Since Docker containers can run on any platform, deploying and distributing applications becomes more flexible and faster.
- Highly portable: Docker containers can run on any operating system and can be developed and deployed across platforms.
- Simplified configuration: Docker simplifies the deployment process because the container only needs to contain all the components needed to run the application. This eliminates many configuration steps.
- Resource Maximization: Docker containers allow multiple containers to share resources on the same server, so server resources can be utilized more efficiently.
- Easy maintenance: Since containers and images are independent, containers can be easily upgraded or changed without affecting other containers.
Practical Application: Docker is widely used in application development. It can be used to build, test and deploy code. Developers can use Docker images to easily create consistent development environments and share them with others. Docker can also be used to deploy applications in different environments, making applications easier to maintain and update. For example, if an application needs to run on different operating systems, you can use Docker to create a cross-platform container and run it on different operating systems. This makes the application more flexible and easier to manage.