How to import docker images

Importing images in Docker involves getting prebuilt container images from remote repositories and importing them into local repositories. The steps include: pull the image (docker pull) list the docker images (docker images) and import the image to the local repository (docker import)

Docker import images

Importing images in Docker is the process of getting and using prebuilt container images. Mirrors are essentially portable packages that contain applications and their dependencies. After importing the images, you can create and run containers based on them.

step:

1. Pull the mirror:

    <code>docker pull </code>

   For example, to pull an Ubuntu image, run:

    <code>docker pull ubuntu</code>

2. List the pulled mirrors:

    <code>docker images</code>

   This will display all the pulled images.

3. Import the image to the local repository:

    <code>docker import <tar> </tar></code>

   For example, to import a mirror from a local tar file into an image named "my-image", run:

    <code>docker import my-image.tar my-image:latest</code>

4. Verify import:
   Run the "docker images" command again to verify that the import is successful. The imported image should be displayed in the list.

Other methods:

• Loading the image using Dockerfile:
  The Dockerfile contains a "FROM" directive that specifies the underlying image. When building a Dockerfile, it automatically pulls and imports the underlying image.
• Loading the image using Docker Compose:
  Docker Compose is a tool for defining and managing Docker applications. It supports the use of the "image" field to specify the image to be imported.

hint:

• Pulling the mirror requires a network connection.
• The image name can contain a namespace (for example, "library/ubuntu") to specify images from registries such as Docker Hub.
• Tags specify a specific version of the image. Leave blank to indicate the latest version.

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