Where are Docker images stored on the host machine?

问题

I managed to find the containers under directory /var/lib/docker/containers, but I can\'t find the images.

What are the directories and files under /var/lib/docker?

回答1:

The contents of the /var/lib/docker directory vary depending on the driver Docker is using for storage.

By default this will be aufs but can fall back to overlay, overlay2, btrfs, devicemapper or zfs depending on your kernel support. In most places this will be aufs but the RedHats went with devicemapper.

You can manually set the storage driver with the -s or --storage-driver= option to the Docker daemon.

/var/lib/docker/{driver-name} will contain the driver specific storage for contents of the images.
/var/lib/docker/graph/<id> now only contains metadata about the image, in the json and layersize files.

In the case of aufs:

/var/lib/docker/aufs/diff/<id> has the file contents of the images.
/var/lib/docker/repositories-aufs is a JSON file containing local image information. This can be viewed with the command docker images.

In the case of devicemapper:

/var/lib/docker/devicemapper/devicemapper/data stores the images
/var/lib/docker/devicemapper/devicemapper/metadata the metadata
Note these files are thin provisioned "sparse" files so aren't as big as they seem.

回答2:

When using Docker for Mac Application, it appears that the containers are stored within the VM located at:

~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/Docker.qcow2

UPDATE (Courtesy of mmorin):

As of Jan 15 2019 it seems there is only this file:

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

that contains the Docker Disk and all the images and containers within it.

回答3:

In the special case of Mac OS X or Windows, using boot2docker, your Docker images are stored within a VirtualBox VM managed by boot2docker.

This VM will be stored in normal place of VirtualBox images:

OS X: ~/VirtualBox VMs/boot2docker-vm

Windows: %USERPROFILE%/VirtualBox VMs/boot2docker-vm

You can reset it by running (WARNING: This will destroy all images you've built and downloaded so far):

boot2docker down
boot2docker destroy
boot2docker init
boot2docker up

This is especially useful if you kept tons of intermediate images when building / debugging a build without the useful --rm options, I quote them here for reference: Use:

docker build -t webapp --rm=true --force-rm=true .

instead of:

docker build -t webapp .

回答4:

Actually, Docker images are stored in two files as shown by following command

$ docker info

Data file: /var/lib/docker/devicemapper/devicemapper/data

Metadata file: /var/lib/docker/devicemapper/devicemapper/metadata

回答5:

The images are stored in /var/lib/docker/graph/<id>/layer.

Note that images are just diffs from the parent image. The parent ID is stored with the image's metadata /var/lib/docker/graph/<id>/json.

When you docker run an image. AUFS will 'merge' all layers into one usable file system.

回答6:

On the newly released 'Docker for Windows', which uses Hyper-V, data is located in the Docker virtual hard disk:

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

You can also open the 'Hyper-V Manager' for access to the Docker / MobyLinuxVM.

回答7:

For someone who is using Docker toolbox (that uses docker-machine), the answers concerning boot2docker on Mac OS X is not valid. The docker-machine VM is called "default" and it exists in the /Users/<username>/.docker/machine/machines/default/ directory.

回答8:

On Ubuntu you can "play" with images running

sudo baobab /var/lib/docker

Actually, images are stored within /var/lib/docker/aufs/diff

回答9:

In Docker for Windows (native Windows) the default container storage is at:

   > docker info
   ...
   Docker Root Dir: C:\ProgramData\Docker
   ...

回答10:

If you are using Docker for MAC (not boot2docker) then the location is /Users/<</>UserName></>/Library/Containers/com.docker.docker/Data/

回答11:

As answered here, if you're on Mac, it is located at

/Users/MyUserName/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/Docker.qcow2

回答12:

Expanding on Tristan's answer, in Windows with Hyper-V you can move the image with these steps from matthuisman:

In Windows 10,

Stop docker etc

Type "Hyper-V Manager" in task-bar search box and run it.

Select your PC in the left hand pane (Mine is called DESKTOP-CBP**)

Right click on the correct virtual machine (Mine is called MobyLinuxVM)

Select "Turn off" (If it is running)

Right click on it again and select "Move"

Follow the prompts

回答13:

I use the boot2docker for Docker on Mac OSX, so the images is stored into the /Users/<USERNAME>/VirtualBox VMs/boot2docker-vm/boot2docker-vm.vmdk.

回答14:

I can answer this question only for Ubuntu users:

The root directory of docker can be found when you run the command docker info

Docker directory will be given in this line: "Docker Root Dir: /var/lib/docker"

About the docker images, they are stored inside the docker directory: /var/lib/docker/aufs/diff/

Remember these things are not same in all version of docker. Currently, I am using 1.12.3.

回答15:

If you keep in mind that Docker is still running in a VM, the system paths are relative to the VM and not from the Mac Osx system. As it says all is contained in a VM file :

/Users/MyUserName/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/Docker.qcow2

Try to run Alpine image with this volume option and the ls command you are able to list the VM host:

docker run --rm -it -v /:/vm-root alpine:edge ls -l /vm-root

After this just try :

docker run --rm -it -v /:/vm-root alpine:edge ls -l /vm-root/var/lib/docker

Now, you are able to list the docker folder from the VM host

回答16:

In Docker for Windows, the logs are here: %USERPROFILE%\AppData\Local\Docker

回答17:

check for the docker folder in /var/lib

the images are stored at below location:

/var/lib/docker/image/overlay2/imagedb/content

回答18:

Use docker info command to display system-wide information and the location may vary.

Depending on the storage driver in use, additional information can be shown, such as pool name, data file, metadata file, data space used, total data space, metadata space used, and total metadata space.

The data file is where the images are stored and the metadata file is where the meta data regarding those images are stored. When run for the first time Docker allocates a certain amount of data space and meta data space from the space available on the volume where /var/lib/docker is mounted.

Here is the example on Ubuntu (check Root Dir):

$ docker info
...
Server Version: 18.06.1-ce
Storage Driver: aufs
 Root Dir: /var/snap/docker/common/var-lib-docker/aufs
...
Docker Root Dir: /var/snap/docker/common/var-lib-docker
...

And here is the example on Travis CI (see Docker Root Dir):

$ docker info
Server Version: 17.09.0-ce
Storage Driver: overlay2
 Backing Filesystem: extfs
...
Docker Root Dir: /var/lib/docker
...

You can use --format parameter to extract that information into a single file, e.g.

$ docker info --format '{{.DriverStatus}}'
[[Root Dir /var/snap/docker/common/var-lib-docker/aufs] [Backing Filesystem extfs] [Dirs 265] [Dirperm1 Supported true]]

or:

$ docker info --format '{{json .DriverStatus}}'
[["Root Dir","/var/snap/docker/common/var-lib-docker/aufs"],["Backing Filesystem","extfs"],["Dirs","265"],["Dirperm1 Supported","true"]]

回答19:

Environment: Windows 10 Pro, docker desktop 2.0.3.0 edge

right-click docker icon in system tray, select settings - advanced :

Disk image location (editable via the browser) :

C:\Users\Public\Documents\Hyper-V\Virtual Hard Disks\DockerDesktop.vhdx

(it's there - Documents directory is hidden)

回答20:

use docker inspect container_id
find folder under MergedDir

# example. 
"MergedDir": "/var/lib/docker/overlay2/f40cc2ea8912ec3b32deeef5a1542a132f6e918acb/merged

回答21:

On Fedora, Docker uses LVM for storage if available. On my system docker info shows:

Storage Driver: devicemapper
 Pool Name: vg01-docker--pool
 Pool Blocksize: 524.3 kB
 Base Device Size: 10.74 GB
 Backing Filesystem: xfs
 Data file:
 Metadata file:
 Data Space Used: 9.622 GB
 ...

In that case, to increase storage, you will have to use LVM command line tools or compatible partition managers like blivet.

回答22:

In Windows 2016, docker (DockerMsftProvider) uses the folder "windowsfilter" under docker root

>docker info
...
Storage Driver: windowsfilter
...
Docker Root Dir: C:\ProgramData\docker
...

It uses the "tmp" folder under docker root to download the files and it deletes the files after extracting the downloaded files to "windowsfilter" folder.

回答23:

On Debian Unstable/Sid,

docker info to find system-wide information.

images are stored at /var/lib/docker/image/overlay2/imagedb/content and

containers are stored at /var/lib/docker/containers

docker version 18.06.0-ce, API version 1.38

回答24:

I couldn't resolve the question with Docker version 18.09 on macos using the above answers and tried again.

The only actual solution for me was using this docker-compose.yml configuration:

version: '3.7'
...
  services:
    demo-service:
      volumes:
        - data-volume:/var/tmp/container-volume

volumes:
  data-volume:
    driver: local
    driver_opts:
      type: none
      o: bind
      device: /tmp/host-volume

After launching with docker-compose up I finally had /tmp/host-volume from macos shared as writeable volume from within the container:

> docker exec -it 1234 /bin/bash
bash-4.4$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
...
osxfs                488347692 464780044  21836472  96% /var/tmp/container-volume

Hope this helps others too.

回答25:

Images are stored inside /var/lib/docker and then under applicable storage driver directory.

Storage driver, being used, can be determined by executing docker info command.

回答26:

According to the Docker Getting Started guide "your built image" is "in your machine’s local Docker image registry."

This is still strange to me, because now it leads to the question. Where is my machine's local Docker image registry?

Nevertheless, I definitely think this info is worth sharing as an answer.

回答27:

For "Docker Desktop", click on docker system tray icon and click "Settings".

On the Advanced tab, you can see the disk image location.

回答28:

If anyone need it for scripting purposes, here is a one-line solution.

In POSIX shell, with PCRE enabled grep, try:

DOCKER_ROOT_DIR="$(docker info 2>&1 | grep -oP '(?<=^Docker Root Dir: ).*')"

In PowerShell:

$DOCKER_ROOT_DIR="$(docker info 2>&1 | foreach {if($_ -match "Docker Root Dir"){$_.TrimStart("Docker Root Dir: ")}})"

Note, when on Windows 10 (as of 10.0.18999.1), in default configurations, it returns:

C:\ProgramData\Docker in "Windows containers" mode
/var/lib/docker, in "Linux containers" mode

来源：https://stackoverflow.com/questions/19234831/where-are-docker-images-stored-on-the-host-machine

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Docker

docker-image