Where is the image saved by docker?

Save location: 1. Linux is saved in "/var/lib/docker/"; 2. Windows is saved in "C:\ProgramData\DockerDesktop"; 3. Mac is saved in "com.docker. docker/Data/vms/0/".

The operating environment of this tutorial: linux7.3 system, docker-1.13.1 version, Dell G3 computer.

Where is the image saved by docker

Docker uses two formats to represent running processes - images and containers, both of which store data on your computer's drive. We'll discuss the commands provided by Docker for working with data, and how to use them to access image and container files.

The difference between images and containers

Images are what you create when you run a docker build; they are stored in a container registry like Docker Hub and contain the runtime All files and code of the application. You can think of them as ISO files for your virtual machine's operating system.

Containers are created from images, they are like actual virtual machines running applications. You may have multiple containers running in parallel on the same image. Each container has its own file system, optionally created using "volume mounts" to bind data from the host to the container.

Use Docker Image Storage

Image to store the entire contents of the image on your drive. Whenever you pull an image from the internet, it is downloaded and stored, usually permanently. Images can be very large, so they will grow over time, especially on laptops with limited storage space.

If you want to access image data directly, it is usually stored in the following location:

Linux: /var/lib/docker/

windows: C:\ProgramData\DockerDesktop

Apple system: ~/Library/Containers/com.docker.docker/Data/vms/0/

However, touching this data is probably a bad idea. Docker's storage is complex and actually varies greatly depending on the storage driver it uses. Linux now uses overlay2 by default on most distributions and is not even accessible to most end users. Messing with this can result in data loss.

Instead, Docker provides managed commands to process images. You can view all versions of a downloaded image using a simple command:

Fortunately, it's not as bad as it seems, since Docker images store versions incrementally. This means that whenever you download a new version, it will only replace the parts that have changed. If you often use the same images over and over again, you probably won't add much to your storage costs.

However, if you use many different images, you may have many saved images that you no longer even use. To clean up these, Docker provides a built-in command to run garbage collection. This will trim all images that are not referenced, i.e. are not tagged or referenced by any container.

Recommended learning: "docker video tutorial"

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