What is the docker tag used for?

In docker, tag is a command used to mark a local image and classify it into a certain warehouse; this command can be used to tag the image, and the syntax is "docker tag [OPTIONS] IMAGE[: TAG] [REGISTRYHOST/][USERNAME/]NAME[:TAG]".

The operating environment of this tutorial: linux7.3 system, docker version 19.03, Dell G3 computer.

What is the docker tag used for?

docker tag: Mark the local image and classify it into a certain warehouse.

Syntax

docker tag [OPTIONS] IMAGE[:TAG] [REGISTRYHOST/][USERNAME/]NAME[:TAG]

Example

Mark the image ubuntu:15.10 as a runoob/ubuntu:v3 image.

root@runoob:~# docker tag ubuntu:15.10 runoob/ubuntu:v3
root@runoob:~# docker images   runoob/ubuntu:v3
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
runoob/ubuntu       v3                  4e3b13c8a266        3 months ago        136.3 MB

The detailed explanation is as follows

Mirroring through ID tag

The following is a local mirror with an ID of 0e5574283393 to the "fedora" repository, the tag name version1.0:

docker tag 0e5574283393 fedora/httpd:version1.0

Mirroring by name tag

Use the name "httpd" tag to locally mirror to the repository "fedora", and its tag name is version1.0

docker tag httpd fedora/httpd:version1.0

Note that since the tag name referencing httpd is not specified, httpd:latest is referenced by default.

Tag an image by name and tag name

Make a label for the local image named httpd and tag name test. Its repository is fedora and the label name is version1.0.test.

docker tag httpd:test fedora/httpd:version1.0.test

tag an image to a private repository

To push an image to a private registry, rather than a public docker registry, you must specify a registry host name and port to tag the image.

docker tag 0e5574283393 myregistryhost:5000/fedora/httpd:version1.0

Recommended learning: "docker video tutorial"

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