Label image

2 snippets in Docker

DKDocker

Tag an Image

syntax

docker tag <source_image>[:<tag>] <target_image>[:<tag>]

example

docker tag myapp:1.0 registry.example.com/myapp:1.0
docker tag myapp:1.0 myapp:latest

Note Tagging does not duplicate image layers — it just creates a new reference pointing to the same image ID. You can have many tags for one image.

LABEL — Add Metadata

DK · Dockerfile

syntax

LABEL <key>=<value> [<key>=<value>...]

example

LABEL maintainer="[email protected]"
LABEL version="2.1" description="API backend service"

Note Labels are key-value metadata stored in the image. They show up in docker inspect and can be used as filters: docker images --filter label=version=2.1. Use the OCI standard keys (org.opencontainers.image.*) for interoperability.