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Docker Desktop stores Linux containers and images in a single, large “disk image” file in the Mac filesystem. This is different from Docker on Linux, which usually stores containers and images in the /var/lib/docker directory.

Where is the disk image file?

To locate the disk image file, select the Docker icon and thenPreferences > Resources > Advanced.

The Advanced tab displays the location of the disk image. It also displays the maximum size of the disk image and the actual space the disk image is consuming. Note that other tools might display space usage of the file in terms of the maximum file size, and not the actual file size.

If the file is too big

If the disk image file is too big, you can:

• move it to a bigger drive,
• delete unnecessary containers and images, or
• reduce the maximum allowable size of the file.

Move the file to a bigger drive

To move the disk image file to a different location:

1. Select Preferences > Resources > Advanced.

2. In the Disk image location section, click Browse and choose a new location for the disk image.

3. Click Apply & Restart for the changes to take effect.

Do not move the file directly in Finder as this can cause Docker Desktop to lose track of the file.

Delete unnecessary containers and images

Check whether you have any unnecessary containers and images. If your client and daemon API are running version 1.25 or later (use the docker version command on the client to check your client and daemon API versions), you can see the detailed space usage information by running:

Alternatively, to list images, run:

and then, to list containers, run:

If there are lots of redundant objects, run the command:

This command removes all stopped containers, unused networks, dangling images, and build cache.

It might take a few minutes to reclaim space on the host depending on the format of the disk image file:

• If the file is named Docker.raw: space on the host should be reclaimed within a few seconds.
• If the file is named Docker.qcow2: space will be freed by a background process after a few minutes.

Space is only freed when images are deleted. Space is not freed automatically when files are deleted inside running containers. To trigger a space reclamation at any point, run the command:

Note that many tools report the maximum file size, not the actual file size.To query the actual size of the file on the host from a terminal, run:

In this example, the actual size of the disk is 2333548 KB, whereas the maximum size of the disk is 64 GB.

Reduce the maximum size of the file

To reduce the maximum size of the disk image file:

1. Select the Docker icon and then select Preferences > Resources > Advanced.

2. The Disk image size section contains a slider that allows you to change the maximum size of the disk image. Adjust the slider to set a lower limit.

3. Click Apply & Restart.

When you reduce the maximum size, the current disk image file is deleted, and therefore, all containers and images will be lost.

These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

Download macOS

Find the appropriate download link in the upgrade instructions for each macOS version:

macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.

OS X El Capitan
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

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1. Connect the USB flash drive or other volume that you're using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
2. Open Terminal, which is in the Utilities folder of your Applications folder.
3. Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.
   Catalina:*
   Mojave:*
   
   High Sierra:*
   El Capitan:
   
4. Press Return after typing the command.
5. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
6. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
7. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument, similar to the way this argument is used in the command for El Capitan.

Use the bootable installer

After creating the bootable installer, follow these steps to use it:

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1. Plug the bootable installer into a compatible Mac.
2. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
   Learn about selecting a startup disk, including what to do if your Mac doesn't start up from it.
3. Choose your language, if prompted.
4. A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
5. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:

Catalina:

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Mojave:

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High Sierra:

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El Capitan: