What is the tag of docker?

In docker, tag is a command used to label an image; the tag command can mark a local image and classify it into a certain warehouse. 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 tag of docker

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

docker tag is used to tag the image. The syntax is as follows:

Syntax

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

The example is as follows:

Mark the image ubuntu:15.10 It is the runoob/ubuntu:v3 mirror.

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 example is as follows:

For example, I now have a centos image:

I develop centos and developed For the first version, I can tag this version. After tagging, a new image will be generated:

I continued to develop centos and developed the second version, continue to label:

and so on, label each version developed. If I want to roll back the version in the future, I can use the image with the specified label. Create a container:

[root@localhost ~]$ docker run -itd centos:v1

Recommended learning: "docker video tutorial"

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