Docker command

1. Mirror IMAGES operation class

1. Image renaming

Docker tag IMAGE ID NEW REPOSITORY:NEW TAG

IMAGE ID indicates the existing image ID number, and NEW REPOSITORY:NEW TAG indicates the need for a new image name and label, as follows:

Or

Docker tag OLD REPOSITORY NEW REPOSITORY:NEW TAG

OLD REPOSITORY represents the original old image name

But note: docker renames the image, not really renaming it, but renaming the original image copy. The old image still exists.

2.docker uses commit to build a new image based on an existing image

Create a container with and stop running:

Docker run-itd-- name: / bin/bash

Docker stop

Build a new image based on the stopped container:

Docker:

For example:

Docker run-itd-- name ng nginx:latest / bin/bash

Docker stop ng

Docker 912d22c4d37e | ng 20190408_ngnix:20190408_latest

The principle of the construction process:

After creating a running container based on the existing basic image, while the container writes the content it needs, docker will copy the original image layer from top to bottom, and add a read-write layer (the content you need is written on the read-write layer), which is called "copy on write".

Then package the container commit into a new image, create and run a container with the new image, and the original read-write layer becomes a read-only layer.

2. Container operation

1. Run the container command to explain

Docker run-it-d-name ng nginx:latest / bin/bash

/ bin/bash: refers to the command that runs in the container, rather than specifying the bash interpreter on the host