The server is not going to work with that, it serves up multiple libraries. CALIBRE_OVERRIDE_DATABASE_PATH basically limits calibre to using a single library. It *might* work if you specify that single library as a server command line argument but this is not really tested/supported.
What portable version are you talking about. There is no official portable version for linux. Why do you want the db outside the library folders. The original intent for this hack is for when libraries are on slow external media.
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