To migrate from Windows is very simple. I have written a FAQ about it.
The essence:
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Install Plex (DSM 7)
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Create a “Plex” shared folder if you don’t have one.
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In it , create “Library / Application Support”
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Copy the “Plex Media Server” folder (and everything below it) to “Application Support” on the Syno
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Change the permissions (must be Full Control for PlexMediaServer) – see the FAQ
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Uninstall the DSM 7 app – use the ERASE button (discard the empty DSM 7 server)
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Install again.
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It will automatically start migrating (importing) into the DSM 7 structure.
– It will sit at “Installing” until done. -
Open another tab.
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In that tab, watch for then open “Migration.log”. This is where it’s at in the process of importing.
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“Completed: Cleaning /volume1/Plex” is “all done”.
The PMS DSM 7 server will pick up right where the Windows server left off.
At this point, you only need grant permissions to “PlexMediaServer” on each shared folder.
You can use Docker if you really really want but there is no advantage anymore.
Running docker containers along side PMS (like tautulli) works perfectly whether PMS is native app or container app.