Run Sonarr via Docker on Synology DSM 6.0

With Synology DSM 6.0 and upwards Docker is natively supported and this allows you to easily configure services without having to download or manually install services. The first step is to get Docker installed via the Synology Package Center:

Once Docker is installed, you can simply search for the relevant image and install via the registry:

In my case the installation of the images did not work via the web-interface and I received a meaningless “Operation failed” error. If you experience the same you need to connect to the Synology via Terminal (SSH or Telnet) and then install the images manually:

Once you have installed the images (it does not matter if you do this via the command line or the web-interface), you can configure the Docker container:

How to get the PGID and PUID

Sometimes when using data volumes (-v flags) permissions issues can arise between the host OS and the container. Those issues are avoided by specifing the user PUID and group PGID. Just ensure that the data volume directory on the host is owned by the same user/group and it will “just work”. You will again need to get onto a terminal session on the Synology and then look at the content of two files:

The PGID can be found via a “cat /etc/group” and then look up the PGID for the admin group (in my case below the PGID is “101”):

The PUID  can be found via a “cat /etc/synouser.conf” and then look up at the PUID for the admin user (in my case below the PUID is “0”):

Configuring Sonarr for Docker on Synology

From the “Image”-tab select the sonarr:latest image and then click on “Launch with wizard”:

In the first step you want to map the NZBGet internal port (8989) to an external port (I chose 9100, but you can also have the local and the container port be the same):

In the second step you can leave the defaults as is (if you notice too high resource usage, you can alway adjust it later on):

In the “Summary” step you need to click on “Advanced Configuration” to make some adjustments:

In the Volume-settings you need to create a “docker/sonarr” folder which will store the Sonarr configuration and database:

You will configure several Volumes and mounts. The Sonarr Docker image requires “/downloads” (which points contains completed downloads of Series from NZBGet), “/tv” (which points to the stored TV-series on your Synology) and “/config” which contains the Sonarr configuration and database. The way Docker images work is that you assign a Synology volume to a “Docker mount”. The “Docker mount” is pre-configured with a “hard-coded” name and you must not change the “Mount path” name as the exact naming is required by the Docker image to work:

The last step requires you to configure the environment variables for PGID, PUID and time-zone:

Once you saved the configuration you can start the container and then access Sonarr for further configuration via the Local Port you configured above.

Synology indexer is inaccessible via Docker

I have not been able to find solution which runs without “hacking” the Synology for the indexer to work. Since the Docker image runs isolated from the rest of the system, it will not have direct access to the Synology indexer and even if it had, the Synology indexer would not understand the mapped mounts.

I have implemented the Simple Synology NAS Media Index Server which is hosted on Github: https://github.com/racklin/simple-synoindex-server.

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  • Steven Dingley

    Hi there, I have my sonarr all set up but it seems to have problems matching a lot of my current shows but then the search function doesn’t search any torrents. How do i get it to search? Ive set it up the same as I had it as a package.
    Also I noticed you and other tutorials has an extra volume set up in the screen shot but you dont mention it in the discription (usr/syno/bin) do I need that?

    • I use NZBHydra for NZB searches. The “/usr/syno/bin” is a mount to use the Synology Indexer – it’s described towards the end of the post.

      • Steven Dingley

        NZBHydra is not available in settings. And do I need the indexing thing?
        Sorry Im new to all this.

        • I then suggest that you read something like this: https://www.cuttingcords.com/home/ultimate-server/setting-up-sonarr

          • Steven Dingley

            Went through all this still no help. Im setting up on Synology Nas in docker container. I has it set up as normal package before and works fine untill an update is done then stops running and wont start up again. Tried everything I could understand, Couldn’t get it working someone suggested to install in docker as its more stable, but settings won’t work like as package. I even just tried the connection to 9my Plex and wont connect. Seems like it doesn’t have access to anything outside of itself. This docker thing just seems to make thing a lot more complicated. Any ideas? Oh and im trying to search torrents, not usenet is this possible.

          • Docker will run more stable as each Docker image is in essence a “mini-Linux” with an application such as Sonarr embedded. Since a Docker image is an isolated guest from the host (your Synology) you will notice in the description above, that a Docker image requires you to map the Docker container port to a local port (the port on the Synology) as well as assign Synology directories to Docker mounts.

            Think of the Synology running Docker the same way you would install VMWare/VirtualBox on a PC. The PC is the host to VMWare/VirtualBox the same way the Synology is the host to Docker. Docker is the guest to the Synology the same way a VMWare image is a guest to the PC. As such the Docker container needs to have full IPs to reference servers running on the Synology or have access to DNS if you resolve locally. The same applies to storage and directories.

            Remember, if your Synology is for example on IP 192.168.1.100 and you use the above config example, you will be able to get to Sonar via http://192.168.1.100:9100 (the local port you configured for Sonarr). If your PlexServer is also running on the Synology, you would need to configure Sonarr to use http://192.168.1.100:32400/ to connect your PlexServer.

            You can not use http://127.0.0.1:32400 (or localhost) in the Docker Container as this would reference the Docker Container and not the Synology.