호스트 시스템에서 Docker 이미지는 어디에 저장됩니까?

/var/lib/docker/storage-driver

Moreover, the contents stored inside the /var/lib/docker path depend on the storage driver that you are using as well. Let’s first understand the docker storage drivers in short.

도커 스토리지 드라이버

In an ideal case, very little amount of data gets written onto the writable layer of a Docker container. And we use volumes in Docker to write such data. But there are some workloads that require us to be able to use the container’s writable layer to write data and this is exactly where storage drivers in Docker come in.

Docker uses a pluggable architecture to support various different storage drivers. It totally depends upon these storage drivers that how the Docker images and containers are managed and stored in our Docker host.

The different types of storage drivers supported by Docker are - overlay2, aufs, devicemapper, btrfs, zfs, vfs. The current default Docker Storage driver is overlay2.

To check the default storage driver, you can use the following command.

$ docker info

You can set the storage driver in two different ways.

You can either use the -s or --storage-driver option along with the Docker run command. Or you can edit the /etc/docker/daemon.json file and include the following lines.

{storge-driver:"aufs"}

Now that we have understood the basics of storage drivers in Docker, let’s see the different behaviors of different drivers when it comes to storing Docker objects in local machines.

Docker 이미지 및 기타 개체의 저장

The driver-specific storage for Docker image contents will be in the path - 

/var/lib/docker/{driver-name}

The metadata about the images is located in the JSON and layersize files in the following directory.

/var/lib/docker/graph/id

In the above paths, the driver-name is the default storage driver used by Docker in your machine and the id refers to the image ID.

If your host machine uses aufs storage driver for Docker, then you can look for image file contents in the following directory.

/var/lib/docker/aufs/diff/id

The directory mentioned below contains the local image information in a JSON file. This information can be retrieved using the Docker images command in the command line.

/var/lib/docker/repositories-aufs

In the case of the devicemapper storage driver, the system stores the image information in the following directory.

           <pre>/var/lib/docker/devicemapper/devicemapper/data</pre>

                <pre>/var/lib/docker/devicemapper/devicemapper/metadata</pre>

                <pre>~/Library/Containers/com.docker.docker/Data/vms/0/Docker.raw</pre>

C:\Users\Public\Documents\Hyper-V\Virtual hard disks\MobyLinuxVM.vhdx