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I was reading docker-compose tutorials and want to understand more about labels
I read that they can be used to store metadata. Is labels useful just to store metadata or Are there any other significant uses? Please help me to understand this more.
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Labels are used in Dockerfile to help organize your Docker Images. Labels are key-value pairs and simply adds custom metadata to your Docker Images. Some key points associated with the LABEL instructions are as follows: To include spaces inside a label, you can use quotes.
Labels are a mechanism for applying metadata to Docker objects, including: Images. Containers. Local daemons. Volumes.
One way to add a label to a Docker image is by adding the LABEL instruction to a Dockerfile , while another way is by adding them to the docker build command using the --label flag. The second way is useful when you need to add labels, like git-commit or build-url , dynamically, during the build pipeline.
Labels are basically for metadata and don't have any specific effect as long as you aren't using them. So there are some use cases where labels come in handy:
docker ps --filter "label=customer=customer1"
So there is no direct implication of labels by docker but there are many use cases where this generic concept is a nice way to allow extending the technology.
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