Dear friends, today we want to talk about a very common command in Docker known as docker tag. This command allows us to tag Docker images, in other words, we can assign a new name to each image so we can manage it better. Tagging images is very important because it helps us to identify different versions of images more easily.
Assume you have a Docker image that by default has a very long identifier (ID). This identifier can be difficult to remember or manage image references. By using the docker tag command, you can assign a simpler name to that image and easily reference it with that name.
For example, you might want to tag your existing image with the name myapp:latest and send it to your Docker repository. This action allows others to also access this image with the specified name.
Well, let's go to how to use this command. We have a simple example here that shows you how you can use docker tag to tag images.
docker tag
Here <old-image-name> is the name of your existing image and <new-image-name> is the new name you want to give to the image. Now let's clarify this topic with a real example.
docker tag myapp:1.0 myapp:latest
In this example, we are changing the name of the image myapp:1.0 to myapp:latest. Now when you refer to the image myapp:latest, it actually points to the same image myapp:1.0.