@ChuckPa you mentioned in your Linux tips and tricks guide that you need to create the plex username on the Syno. Are you assuming that we are using Kerberos idmapd here? For my use case, I have my Syno NFS export set to squah map all users to admin and even though I have the plex account on my Syno…

I recently installed Plex Media Server on a PC running Ubuntu 20.04. Media resides on a Synology DS918+ running DSM 7.0.1. I ended up doing two things: a) configuring the DS918+ to use NFS v3; and b) changing the Plex uid/gid on Ubuntu to match that on the Synology. Note: While searching for in…

[image] kevindd992002: @ChuckPa you mentioned in your Linux tips and tricks guide that you need to create the plex username on the Syno. Are you assuming that we are using Kerberos idmapd here? For my use case, I have my Syno NFS export set to squah map all users to admin and even though I have…

I’ve chatted with FordGuy. Now that I understand his technique, both will work but his is actually a little slicker in that Ubuntu is made to match UID/GID the PMS on the Syno so you end up with one set of permissions for both servers… I had forgotten that trick.

Your research results are pretty similar to mine. As long as the UID/GID of the users in question on both the PMS and Syno are the same, then everything will work as expected. And yes, I do have _netdev in my NFS mount too. Thanks for the detailed instructions, btw

Yes, that’s exactly what the purpose of this thread is. Without the matching ID’s, you end up with mismatching permissions. I understand the whole purpose of your guide, to limit the access of the plex user to read-only on the Syno but without the matching id’s, you would need to enable squash (map…

For reference: [Roger Lipscombe] User ID mapping with NFS on Synology NAS nfs, synology-diskstation asked by Roger Lipscombe on 08:42PM - 04 Jan 15 UTC

Folks, UID/GID mapping is one technique. name matching is the default but a bit slower (microseconds slower for the conversion from name → UID) When you use nfs mount option sec=sys and have matching UID/GID, you get the added benefit of the same text “Username” being shown on both hosts. This …

If you don’t have matching UID/GID – Reading - you grant permission by name and have the NFS server pay the extra cost of name conversion. Writing - You could have a mix of unknown UID/GIDs written to the server OR permission denied unless sec=sys is applied.

I see what you’re saying. I think in Debian the default is sec=sys. Can the Syno also do name matching when the client is writing to the NFS mount?

Syno NFS Permissions

Plex Media Server

kevindd992002 April 11, 2022, 11:53pm 12

I see. But what happens if the UID/GID doesn’t match? And can you confirm that the things we’re discussing are only applicable when squash is not used (disabled)?

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Syno NFS Permissions

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