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Plex in Container Manager on a Synology NAS (Hardware Transcoding)

Important or Recent Updates
Historic UpdatesDate
New DSM7.2 Container Manager Update 01/05/2023
Added additional security option to the compose to restrict the container from gaining new privileges as well as umask variable25/10/2023
Somehow at some point a paragraph about forwarding port 32400 went missing, I had never added it! But it’s in now!!13/06/2024
Changed ‘version’ variable to ‘docker’ this will stop in container server updates!01/07/2024
Historic Updates

In this guide I am going to take you through the setup of Plex in Docker using Container Manager.

Plex Pass

You will only benefit from hardware transcoding if you have an active Plex Pass either monthly or lifetime. If you don’t have one you can either follow this guide or jump over to the non hardware transcoding version.

Does my Synology support Hardware Transcoding?

Before we do anything else, you need to make sure your model of Synology has hardware transcoding capabilities. You need to do a quick lookup via the linked Google Sheet below, this is updated by Plex and makes it super easy to look up your model of NAS.

If you find that hardware transcoding is not available on your model you can jump back over to the standard guide on the menu.

Let’s Begin

As usual, it’s important you complete the two proceeding guides which will get your folder structure and docker, user setup.

Folder Setup

Let’s start by getting some folders set up for the container to use. Open up File Station create the following.


Container Manager

Next we are going to set up a ‘Project’ in Container Manager. Open up Container Manager and click on Project then on the right-hand side click ‘Create’.

In the next screen we will set up our General Settings, enter the following:

Project Name:plex
Source:Create docker-compose.yml

Next we are going to drop in our docker compose configuration copy all the code in the box below and paste it into line ‘1’ just like the screenshot.

    image: linuxserver/plex:latest
    container_name: plex
    network_mode: host
      - PGID=65432 #CHANGE_TO_YOUR_GID
      - TZ=Europe/London #CHANGE_TO_YOUR_TZ
      - UMASK=022
      - VERSION=docker
      - PLEX_CLAIM= #Your Plex Claim Code
      - /volume1/docker/plex:/config
      - /volume1/data/media:/data/media
      - /dev/dri:/dev/dri
      - no-new-privileges:true
    restart: always

A note on Network Mode

You will notice that for Plex we don’t put it on the normal bridge network, this is because DSM reserves the DLNA ports Plex requires in order to use DLNA. So we run in Host mode, so it can share the ports.

Environment Variables

We need to make some changes in order for the container to have the correct permissions to save its configuration files and to have access to your media.

PUID(required) The UID you obtained in the user setup guide
PGID(required) The GID you obtained in the user setup guide
TZ(required) Your timezone
PLEX_CLAIMPlease note the PLEX_CLAIM variable is optional and not always required. You can remove this line if you don’t need it or come back and add it if you are unable to sign in to your server on start up.

To get the code go to and sign in, then put the code you receive after the ‘PLEX_CLAIM=’. You have 4 mins to finish the guide after doing this, so best to grab it just before running the project.


I have pre-filled this section to pass the correct paths, the only thing that you may need to change is the /volume1/ if your file paths are on a different volume.

Click ‘Next’

You do not need to enable anything on the ‘Web portal settings’ screen click ‘Next’ again.

On the final screen click ‘Done’ which will begin the download of the container images and once downloaded they will be launched!

The image will now be downloaded and extracted. You should see ‘Code 0’ when it has finished.

You will now see your Plex running and should have a green status on the left-hand side.

Firewall Exceptions

(Skip if you don’t have the Firewall configured)

If you have enabled and configured the Synology Firewall you will need to create exceptions for any containers that have a Web UI or have any incoming or outgoing connections. This section covers the basics of how to add these. (Please note this is a generic section and will not show the specific ports used in this guide however it applies in the same way)

Also, I would like to refer people to the great guide on getting the Firewall correctly configured over on WunderTechs site.

Head into the Control Panel> Security > Firewall, from here click Edit Rules for the profile you set up when you enabled the Firewall.

Next click on Create and you will see the screen below. Source IP and Action will be automatically selected to All and Allow, I will leave it up to you as to your own preference on whether you want to lock down specific Source IPs from having access. In this example we will leave as All.

You will now choose ‘Custom‘ and then the Custom button

Now select Destination from the drop-down menu, most web based containers require TCP access but check the guide as it will show the port and protocol. Then add comma separated ports. Then press OK.

Click OK a couple of times to get back to the main screen. You will see by default the new rule is added to the bottom of the list. You must always have your Block All rule last in the list as the rules are applied top down so move your container up.

You have now completed the Firewall changes and can continue with the guide.

Port Forwarding

In order to use Plex remotely and stream your local media you need to forward port 32400 from your Router to the NAS IP on the same port. This varies for everyone’s router so check the manual on how to do this.

Plex Initial Setup

After a few minutes you should be able to access the server and go through the Plex setup by going to the IP of your NAS in your browser followed by port 32400/web/


You will be asked to sign in or sign up for an account if you don’t have one already.

You should now be able to add your media which will be in the /data/media folder within Plex

Once you have got to the main Plex interface make sure you go into the settings and turn on

  • Enable HDR tone mapping
  • Use hardware acceleration when available
  • Use hardware-accelerated video encoding

That’s it you are all setup. When a new server update is available you will just need to restart the container, and it will automatically download the latest update.

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Published inPlex 7.2


  1. Joel Joel

    I’m a dope and probably set this up wrong. I had to manually change some settings in container manager to get PLEX to run properly. When it crashes from time to time, the settings revert to my initial ones which did not work. I assume I need to manually change a config file somewhere, but I’m not sure which one or where it is located. This is all being run on a 920+ inside container manager.

    Thank you very much in advance for the help!!

    • Dr_Frankenstein Dr_Frankenstein

      Hi Joel

      If your changes are reverting it sounds like you are editing the container in the GUI and not amending the original compose information, Stop the container and then make changes to the Plex Project instead

  2. Robin Robin

    Hello !

    Thank you again for your help.

    I just wanted to tell you that everything is working well with the last week update :

  3. werner werner

    Hello mates,

    i get this error and i cant fix it.

    Start container plex failed: {“message”:”error gathering device information while adding custom device \”/dev/dri\”: no such file or directory”}.

    can someone help me with this issue?

    • Dr_Frankenstein Dr_Frankenstein


      Which model NAS do you have? If it’s a model with an AMD CPU if so it won’t have graphics capabilities so you will need to remove that line or follow the non hardware transcoding guide.

  4. Robin Robin

    My fault, I should have put “version:docker” instead of “version:latest” in the compose

    Thank you again

    • Dr_Frankenstein Dr_Frankenstein

      Good point – let me change the guide to now specify docker rather than latest. It will mean at least it locks in to the docker container version if changed

  5. Robin Robin

    Hello, thank you for all your tutorials.
    Everything is working fine for me, except the Hardware transcoding is not. I don’t have any “hw” when I play from remote.

    I have a 920+. I tried some things to get the thing working but that does not seem to do the trick.

    Do you have any advice for me ?

    Thank you

    • Dr_Frankenstein Dr_Frankenstein

      Do you get any errors within the Plex log file in relation to the /dev/dri being missing at all? Also what type of file are your transcoding h265/h264 etc

    • Dr_Frankenstein Dr_Frankenstein

      This can’t be coincidence as had 3 people with the same issue in a row.. makes me wonder if it’s a problem with the latest container.. Can you try changing this line to the last version… and then start up the project again after saving

      image: linuxserver/plex:

      • Robin Robin

        Oh thank you ! I tried with “image: linuxserver/plex:″ and it worked.

        The issue was with the actual version. This is what I had in the lors before : ” DEBUG – TPU: hardware transcoding: enabled, but no hardware decode accelerator found”

        What do you suggest, I wait a few month with this version and I can relaunch the Plex-composer with the new “latest” version around September ?

        Thank you again for your help !

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