Clear unused Docker data

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Works with any MacWorks with any Mac running macOS/OS X on Intel or Apple Silicon.

• macOS onlyThis script improves your privacy on macOS
• Single actionThis page belongs to a script, containing basic changes to achieve a task.
• Impact: Medium

  System Functionality / Data Loss Risk: Moderate

  This action improves privacy with minimal impact when you run the recommended script.

  This action improves privacy with some impact when you run the recommended script.
• Bash (Shell script)These changes use macOS system commands to update your settings.
• Administrative (sudo) access requiredThis script requires privilege access to do the system changes
• Fully reversible

  You can fully restore this action (revert back to the original behavior) using this website.

  The restore/revert methods provided here can help you fix issues.

Overview

This script frees up disk space, but also improves user privacy by:

1. Removal of stopped containers: Containers often run applications or services that might process sensitive or personal data. Even if a container is stopped, its filesystem remains intact, and potentially sensitive data inside it can be accessed. By removing stopped containers, we eliminate this potential privacy risk.

2. Deletion of unused images: Images can sometimes contain sensitive information, especially if they were built from Dockerfiles that copied local files or were used in scenarios where sensitive data was processed. Deleting unused images ensures that any inadvertent sensitive information embedded in those images is eradicated.

3. Cleanup of network configurations: Networks, especially custom ones, can contain configurations that reveal details about system architecture, inter-container communication, or even hardcoded secrets. Removing unused networks mitigates risks associated with lingering, outdated, or insecure configurations.

4. Elimination of build cache: The Docker build process uses a cache to speed up image creation. This cache can contain remnants of previous builds, including potentially sensitive data or files. Pruning the build cache ensures that these remnants are deleted, further safeguarding privacy.

5. Footprint reduction: By consistently pruning unused Docker objects, the overall footprint of Docker on the system is reduced. This makes it harder for malicious actors to exploit any lingering or overlooked vulnerabilities in the system or Docker itself.

This script runs docker system prune -af command to clean up unused Docker data ¹.

Specifically, the command will 1:

• Remove all stopped containers.
• Remove all networks not used by at least one container.
• Remove all images not used by any container.
• Remove all build cache.

Use with Caution

This script is only recommended if you understand its implications.

Some non-critical or features may no longer function correctly after running this script.

This script can be fully reversed to restore changes if something goes wrong.

Sources

PrivacyLearn.com maintains strict sourcing standards for accuracy, integrity and up-to-date content. Our content relies on authoritative sources including vendor documentation, industry standards, and verified research. Learn more about our verification process and quality standards in our editorial standards page.

• docker system prune. Docker Documentation. (2023).
  Original: https://docs.docker.com/engine/reference/commandline/system_prune
  Archived: https://web.archive.org/web/20230810171526/https://docs.docker.com/engine/reference/commandline/system_prune/

Apply Now

Choose one of three ways to apply:

Download script

Download and run the script directly

• No app needed
• Offline usage
• Free
• Open-source

Apply protection

Help

How to apply or restore "Clear unused Docker data" using script

• ≈ 3 min to complete
• Tools: Web Browser
• Difficulty: Medium
• ≈ 5 instructions

1. 1

   Download

   Download the script file by clicking on the   Apply protection  button above.
   Use   Undo protection button above to restore changes.
2. 2

   Keep the file

   If warned by your browser, keep the file.
3. 3

   Open

   Open the downloaded file.
4. 4

   Exit

   Once it's done, press any key to exit the window.
5. 5

   Restart

   Restart your computer for all changes to take effect.

Apply with privacy.sexy

Guided, automated application with safety checks

• Recommended for most users
• Includes safety checks
• Free
• Open-source
• Popular
• Offline/Online usage

Open privacy.sexy

Help

How to apply or restore "Clear unused Docker data" using privacy.sexy

• ≈ 3 min to complete
• Tools: privacy.sexy
• Difficulty: Simple
• ≈ 4 instructions

privacy.sexy is free and open-source application that lets securely apply this action easily with more advanced options.

1. 1

   Open or download

   Open or download the desktop application
2. 2

   Choose script

   1. Search for the script name: Clear unused Docker data
   2. Check the script by clicking on the checkbox.
3. 3

   Run

   Click on ▶️ Run button at the bottom of the page.

   This button only appears on desktop version (recommended). On browser, use 💾 Save button.

Run commands

Copy and run commands manually Requires technical knowledge

Apply

Apply changes

if type "docker" &> /dev/null; then
    docker system prune -af
fi

Revert

Restore changes

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Help

How to apply or restore "Clear unused Docker data" using commands

• ≈ 2 min to complete
• Tools: Terminal app
• Difficulty: undefined
• ≈ 3 instructions

1. 1

   Open terminal

   Open Terminal app.
2. 2

   Copy code

   Copy the code:

   Copy Apply Code Copy Revert Code
3. 3

   Paste & run

   Paste the code into Terminal and press Enter to run.

   Some changes require a system restart to take effect

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About the Creators

These people have authored this documentation and written its scripts:

• 

  undergroundwires

  • Certified security professional
  • 7+ years experience securing banks
  • Open-source developer since 2005
  • EU advisor, Public Speaker, Moderator
• Open-Source Contributors

  • Hundreds across the globe
  • Testers, reviewers, developers
  • Companies, military agencies
  • Community since 2017

About Us

Reviewed By

This guide has undergone comprehensive auditing and peer review:

• Expert review by undergroundwires

  • Verified technical accuracy and editorial standards
  • Assessed system impact and user privacy risks

• Public review by large community

  • Privacy enthusiasts and professionals peer-reviewed
  • Millions of end-users tested across different environments

History

We continually monitor our guides, their impact and all other privacy options. We update our guides when new information becomes available. On every update, we publicly store who made the change, what has been changed, why the change was made and when the change was made.

Review Change History Our Change Process