Docker implements re-tagging and deleting the image of the original tag

The docker image id is unique and can physically identify an image. There can be multiple repository: tags, but they will not be repeated and are also unique.

To re-tag, the syntax is:

docker tag imageId repository:newTag

For example, re-tag centos:7 as centos7:base

At this point, there are two images in the repository with the same image ID, but with an additional tag, which means an additional reference. Simply delete the unnecessary references. You must use the tag to delete. Deleting with the image id will physically delete the image, and the two references will be deleted at the same time.

Of course, you can also use this syntax when typing tags:

docker tag repository:tag repository:newTag

Supplementary knowledge: Docker encountered a problem: When there are multiple tags for the same image, the docker rmi image ID command cannot be deleted

Mirror List

Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
runoob/centos 6.7 4994f1f799c7 2 days ago 191MB
runoob/centos dev 4994f1f799c7 2 days ago 191MB
tomcat latest da0729cd9201 2 days ago 463MB

Deleting an image

Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker rmi 4994f1f799c7
Error response from daemon: conflict: unable to delete 4994f1f799c7 (must be forced) - image is referenced in multiple repositories

Deletion method 1

docker rmi -f image ID

As shown below:

Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker rmi -f 4994f1f799c7
Untagged: runoob/centos:6.7
Deleted: sha256:4994f1f799c7c9241c23055ecc7335c074caaa96243dcc665d1c1836216c34f2
Deleted: sha256:6829bdaf30b11efab68c0ae473690ae1637830a560487ce07ad08988484c0987
Deleted: sha256:fd54ea270ce8e890023eaba2a72eff187d27f71f3ffea9e11e9684de8ac9606a
Deleted: sha256:ece17abd46a222b2fa35f1e18a981092605453c258dceca6919e3572ab4f1fbf
Deleted: sha256:b59b8f6f9d682eeb94a3628fded0325e9d43664fdd26651971a6fc4bd34bc3ca
Deleted: sha256:71c39bd52e1858772c19aac2b18203dca9a02f6a07a4cef54099ecd14734da83
Deleted: sha256:6ff1dc40fd96eebca0785a047794a83f3c954e4949c350fbd0661ed0f7ed8c96
Deleted: sha256:19efa1023a08e6d4014cea1821fe9f3b169eed3c11397460fb19db1d22b69fb2
Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
tomcat latest da0729cd9201 2 days ago 463MB

docker rmi : Delete one or more local images.

grammar

docker rmi [OPTIONS] IMAGE [IMAGE…]

OPTIONS description:

-f : force deletion;

–no-prune: Do not remove the process image of this image, it is removed by default;

Deletion method 2

docker rmi repository:tag

As shown below:

Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker rmi runoob/centos:dev
Untagged: runoob/centos:dev
Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
runoob/centos 6.7 4994f1f799c7 2 days ago 191MB
tomcat latest da0729cd9201 2 days ago 463MB

Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker rmi runoob/centos:6.7
Untagged: runoob/centos:6.7
Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
tomcat latest da0729cd9201 2 days ago 463MB

The above article about Docker's implementation of re-tagging and deleting the original tag image is all I have to share with you. I hope it can give you a reference, and I also hope that you will support 123WORDPRESS.COM.

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