This section describes how to build an entire application into a Docker image. After building an image, you can use the image to deploy and upgrade the application. This reduces manual configuration and improves efficiency.
When building an image, ensure that files used to build the image are stored in the same directory.
Required Cloud Services
SoftWare Repository for Container (SWR) provides easy, secure, and reliable management over container images throughout their lifecycle, facilitating the deployment of containerized services.
Basic Concepts
- Image: A Docker image is a special file system that includes everything needed to run containers: programs, libraries, resources, settings, and so on. It also includes corresponding configuration parameters (such as anonymous volumes, environment variables, and users) required within a container runtime. An image does not contain any dynamic data, and its content remains unchanged after being built.
- Container: Images become containers at runtime, that is, containers are created from images. A container can be created, started, stopped, deleted, or suspended.
Procedure
- Log in as the root user to the device running Docker.
- Enter the apptest directory.
cd apptest
ll
Ensure that files used to build the image are stored in the same directory.
- Build an image.
docker build -t apptest .
- Upload the image to SWR. For details, see Uploading an Image Through the Client.