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Diffstat (limited to 'sci-geosciences/mod_tile/files/tileserver_vhost.include')
| -rw-r--r-- | sci-geosciences/mod_tile/files/tileserver_vhost.include | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/sci-geosciences/mod_tile/files/tileserver_vhost.include b/sci-geosciences/mod_tile/files/tileserver_vhost.include new file mode 100644 index 0000000..2848e92 --- /dev/null +++ b/sci-geosciences/mod_tile/files/tileserver_vhost.include @@ -0,0 +1,112 @@ +# You can manually configure each tile set with AddTileConfig or AddTileMimeConfig. +# The first argument is the URL path relative to this virtual host +# under which a tile set is served. The second argument specifies the +# name of the tile set. This is used in the communication with renderd +# and is the directory under which (meta)tiles are stored on disk. +# +# By default (AddTileConfig) mod_tile assumes you are serving png files, however, +# mod_tile can also serve arbitrary other tile types such as javascript vector tiles, +# assuming the backend render daemon can handle the file type. +# To this purpose AddTileMimeConfig takes a 3rd agument, the file extension and it +# will guess the correct mimetype from it. If the mime type is not set correctly automatically, +# you need to use the configuration file route, where you can specify the mimetype and file extension +# independently. +# +# AddTileConfig /folder/ TileSetName +# AddTileMimeConfig /folder2/ TileSetName2 js + +# Alternatively (or in addition) you can load all the tile sets defined in the configuration file into this virtual host +LoadTileConfigFile /etc/renderd.conf + +# Timeout before giving up for a tile to be rendered +ModTileRequestTimeout 3 + +# Timeout before giving up for a tile to be rendered that is otherwise missing +ModTileMissingRequestTimeout 10 + +# If tile is out of date, don't re-render it if past this load threshold (users gets old tile) +ModTileMaxLoadOld 2 + +# If tile is missing, don't render it if past this load threshold (user gets 404 error) +ModTileMaxLoadMissing 5 + +# Socket where we connect to the rendering daemon +ModTileRenderdSocketName /var/run/renderd/renderd.sock + +## +## Options controlling the cache proxy expiry headers. All values are in seconds. +## +## Caching is both important to reduce the load and bandwidth of the server, as +## well as reduce the load time for the user. The site loads fastest if tiles can be +## taken from the users browser cache and no round trip through the internet is needed. +## With minutely or hourly updates, however there is a trade-off between cacheability +## and freshness. As one can't predict the future, these are only heuristics, that +## need tuning. +## If there is a known update schedule such as only using weekly planet dumps to update the db, +## this can also be taken into account through the constant PLANET_INTERVAL in render_config.h +## but requires a recompile of mod_tile + +## The values in this sample configuration are not the same as the defaults +## that apply if the config settings are left out. The defaults are more conservative +## and disable most of the heuristics. + + +## +## Caching is always a trade-off between being up to date and reducing server load or +## client side latency and bandwidth requirements. Under some conditions, like poor +## network conditions it might be more important to have good caching rather than the latest tiles. +## Therefor the following config options allow to set a special hostheader for which the caching +## behaviour is different to the normal heuristics +## +## The CacheExtended parameters overwrite all other caching parameters (including CacheDurationMax) +## for tiles being requested via the hostname CacheExtendedHostname +#ModTileCacheExtendedHostname cache.tile.openstreetmap.org +#ModTileCacheExtendedDuration 2592000 + +# Upper bound on the length a tile will be set cacheable, which takes +# precedence over other settings of cacheing +ModTileCacheDurationMax 604800 + +# Sets the time tiles can be cached for that are known to by outdated and have been +# sent to renderd to be rerendered. This should be set to a value corresponding +# roughly to how long it will take renderd to get through its queue. There is an additional +# fuzz factor on top of this to not have all tiles expire at the same time +ModTileCacheDurationDirty 900 + +# Specify the minimum time mod_tile will set the cache expiry to for fresh tiles. There +# is an additional fuzz factor of between 0 and 3 hours on top of this. +ModTileCacheDurationMinimum 10800 + +# Lower zoom levels are less likely to change noticeable, so these could be cached for longer +# without users noticing much. +# The heuristic offers three levels of zoom, Low, Medium and High, for which different minimum +# cacheing times can be specified. + +#Specify the zoom level below which Medium starts and the time in seconds for which they can be cached +ModTileCacheDurationMediumZoom 13 86400 + +#Specify the zoom level below which Low starts and the time in seconds for which they can be cached +ModTileCacheDurationLowZoom 9 518400 + +# A further heuristic to determine cacheing times is when was the last time a tile has changed. +# If it hasn't changed for a while, it is less likely to change in the immediate future, so the +# tiles can be cached for longer. +# For example, if the factor is 0.20 and the tile hasn't changed in the last 5 days, it can be cached +# for up to one day without having to re-validate. +ModTileCacheLastModifiedFactor 0.20 + +## Tile Throttling +## Tile scrappers can often download large numbers of tiles and overly staining tileserver resources +## mod_tile therefore offers the ability to automatically throttle requests from ip addresses that have +## requested a lot of tiles. +## The mechanism uses a token bucket approach to shape traffic. I.e. there is an initial pool of n tiles +## per ip that can be requested arbitrarily fast. After that this pool gets filled up at a constant rate +## The algorithm has to metrics. One based on overall tiles served to an ip address and a second one based on +## the number of requests to renderd / tirex to render a new tile. + +## Overall enable or disable tile throttling +ModTileEnableTileThrottling Off +## Parameters (poolsize in tiles and topup rate in tiles per second) for throttling tile serving. +ModTileThrottlingTiles 10000 1 +## Parameters (poolsize in tiles and topup rate in tiles per second) for throttling render requests. +ModTileThrottlingRenders 128 0.2 |