[Tile-serving] [openstreetmap/mod_tile] "render_expired" doesn't use TILEDIR from map name in /etc/renderd.conf when deciding if tiles exist already (Issue #286)

[Hummeltech]

Yes, it shouldn't be re-rendering, unless you're using `--force`.

https://github.com/openstreetmap/mod_tile/blob/2a4532f00261954aa12193bf7d8cd03ed43ff80f/src/render_list.c#L382-L389

It's likely that it's being re-rendered because the default value for `tile_dir` is `/var/cache/renderd/tiles` and your tiles are under `/var/lib/mod_tile` so it is unable to find the file in order to `stat` it and determine whether it needs to be rendered or not. You'll need to specify `--tile-dir /var/lib/mod_tile` in order to tell it to look for tiles in the right spot.

The comment mentioned by @SomeoneElseOSM also refers to some recent updates allowing you to override the defaults for several options with the corresponding values from the specified `renderd.conf` file, but that has not been released. So, unless you are compiling this yourself, you won't be able to use the new option.

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