Synology: How to Clean Docker

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Synology How to Clean Docker

Many Docker images and containers that you install on your Synology NAS following various guides on the web leave traces that should be deleted so that future installations may work flawlessly. Here on mariushosting you can find a varied list of Docker images to install on your NAS, but, if you ever decide to uninstall them for whatever reason, remember that it is a good practice to uninstall them properly so that, in the future, you do not experience any problems if you want to install them back from scratch.

  • STEP 1

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  • STEP 2

InstallĀ Portainer using my step by step guide. If you already have Portainer installed on your Synology NAS, skip this STEP. Attention: Make sure you have installed the latest Portainer version.

  • STEP 3

First of all, always remember to STOP all the containers you no longer need. If you don’t stop them first, you can’t delete them.

  • STEP 4

Log into Portainer. In the menu on the left, click on Images. Click Filter. Check Unused. Follow the instructions in the image below.

Synology NAS Clean Docker With Portainer 1

  • STEP 5

You will find a list of images marked in orange with the word “Unused” – these are the images that you no longer use. Check all the images with the Unused tag, then click the Remove button. Follow the instructions in the image below.

Synology NAS Clean Docker With Portainer 2

A new pop up window will open. Click Remove the image. Follow the instructions in the image below.

Synology NAS Clean Docker With Portainer 3

Once you click the Remove the image button, all images tagged Unused will be automatically deleted.

Synology NAS Clean Docker With Portainer 4

  • STEP 6

In the menu on the left, click on Networks. Make sure there are no other Networks created by images you no longer use. Check all the Networks that you are no longer using, then click Remove. Follow the instructions in the image below.

Synology NAS Clean Docker With Portainer 5

A new pop up window will open. Click Remove. Follow the instructions in the image below.

Synology NAS Clean Docker With Portainer 6

Once you click the Remove button, all Networks that you are no longer using will be automatically deleted.

Synology NAS Clean Docker With Portainer 7

  • STEP 7

In the menu on the left, click on Volumes. Check all volumes tagged UnusedĀ and click on the Remove button. Follow the instructions in the image below.

Synology NAS Clean Docker With Portainer 8

A new pop up window will open. Click Remove. Follow the instructions in the image below.

Synology NAS Clean Docker With Portainer 9

Once you click the Remove button, all volumes created by various images you no longer use will be automatically deleted.

Synology NAS Clean Docker With Portainer 10

  • STEP 8

Remove all folders in Synology File Station that you no longer use, or have used in the past to run specific Docker images. Just delete them and recreate the folders from scratch if you need a specific image to be reinstalled again.

Note: Portainer becomes a must-have if you have Docker installed on your Synology NAS.
Note: One of the main advantages of removing Docker images you no longer use is that this will free up space on your NAS.
Note: How to Clean Docker Automatically.

This post was updated on Friday / August 22nd, 2025 at 1:31 AM

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