Plex in Docker on a Synology NAS (Hardware Transcoding)

Last updated on 6 April 2025

Please note if you are using DSM7.2 or higher you should use the Container Manager version of this guide from the menu.

This guide has reached the end of its updates as most people are now on the latest DSM update - This guide is correct as of 08/12/2023 however no further updates will be added.

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

As of writing the Synology UI does not have the capability of passing through specific hardware to a container, this means we will need to set up Plex via SSH (terminal). However, don’t freak out as it’s not that difficult!

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.

• This great Google Sheet officially updated by Plex

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

Let’s Begin

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

• Step 1: Directory Setup Guide
• Step 2: Setting up a restricted Docker user

Docker Compose

We will be using Docker Compose to set up the Plex container. In a nutshell we will be creating a text file (YAML formatted) which tells Docker exactly how we want to set up a specific container.

The next steps can be done either using a code/text editor such as Notepad++ or to keep things simple for this guide we will be using the Synology Text Editor which can be installed from the Package Center.

Open up Text Editor and click on File then New to start a new file.

You can now copy and paste the details below into the new text file, it is important you don’t change the spacing as YAML has to be formatted correctly in order to be read by Docker Compose.

services:
  plex:
    image: linuxserver/plex
    container_name: plex
    network_mode: host
    environment:
      - PUID=1234 #CHANGE_TO_YOUR_UID
      - PGID=65432 #CHANGE_TO_YOUR_GID
      - TZ=Europe/London #CHANGE_TO_YOUR_TZ
      - VERSION=latest
      - PLEX_CLAIM=
    volumes:
      - /volume1/docker/plex:/config
      - /volume1/data/media:/data/media
    devices:
      - /dev/dri:/dev/dri
    restart: unless-stopped

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.

Please 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 https://plex.tv/claim 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 compose file in a few steps time.

PUID and PGID

When you created your docker user you would have noted down these IDs add these to the compose file in the ‘environment:’ section

Volumes

We can now pass through our file paths into the container they are mounted using the volume’s section of the compose file.

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.

Timezone

The timezone variable will tell the container where you are in the world meaning your logs and scheduled tasks will run at the correct times. A list of timezones with the correct formatting can be found here wikipedia.org/wiki/List_of_tz_database_time_zones

Your final file should look similar to the one shown below.

Saving the Compose File

We now need to save this file into our docker share.

Click on File then Save As, navigate to the ‘Docker’ share and create a new folder called ‘plex’ (lower case)

You need to change the ‘File name’ to plex.yml and save it in the ‘docker‘ folder

SSH and Docker-Compose

It’s time to get logged into your Diskstation via SSH, you can do this in the same way as when you obtained your IDs in the ‘Setting up a restricted Docker user‘ guide.

Once you have logged in you will need to give 2 commands, you can copy and paste these one at a time — you will need to enter your password for the command starting with ‘sudo’

First we are going to change directory to where the plex.yml is located, type the below and then press enter.

cd /volume1/docker

Then we are going to instruct Docker Compose to read the file we created and complete the set-up of the container. Again type the below and press enter.

sudo docker-compose -f plex.yml up -d

When the command has completed you should be able to see Plex running in the list of containers in the Synology GUI.

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/

e.g 192.168.0.45:32400/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

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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