X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/0f1752948651a4939e1a808f2a44face6abc305a..addfae31b67c9c085d2ae790d95b30a6f331a5e4:/docs/admin/Update.md diff --git a/docs/admin/Update.md b/docs/admin/Update.md index b4692321..9d224b9e 100644 --- a/docs/admin/Update.md +++ b/docs/admin/Update.md @@ -1,67 +1,166 @@ # Updating the Database There are many different ways to update your Nominatim database. -The following section describes how to keep it up-to-date with Pyosmium. -For a list of other methods see the output of `./utils/update.php --help`. +The following section describes how to keep it up-to-date using +an [online replication service for OpenStreetMap data](https://wiki.openstreetmap.org/wiki/Planet.osm/diffs) +For a list of other methods to add or update data see the output of +`nominatim add-data --help`. -!!! warning +!!! important If you have configured a flatnode file for the import, then you - need to keep this flatnode file around for updates as well. + need to keep this flatnode file around for updates. -#### Installing the newest version of Pyosmium +### Installing the newest version of Pyosmium -It is recommended to install Pyosmium via pip. Make sure to use python3. +The replication process uses +[Pyosmium](https://docs.osmcode.org/pyosmium/latest/updating_osm_data.html) +to download update data from the server. +It is recommended to install Pyosmium via pip. Run (as the same user who will later run the updates): ```sh pip3 install --user osmium ``` -Nominatim needs a tool called `pyosmium-get-changes` which comes with -Pyosmium. You need to tell Nominatim where to find it. Add the -following line to your `settings/local.php`: +### Setting up the update process - @define('CONST_Pyosmium_Binary', '/home/user/.local/bin/pyosmium-get-changes'); - -The path above is fine if you used the `--user` parameter with pip. -Replace `user` with your user name. - -#### Setting up the update process - -Next the update needs to be initialised. By default Nominatim is configured +Next the update process needs to be initialised. By default Nominatim is configured to update using the global minutely diffs. If you want a different update source you will need to add some settings -to `settings/local.php`. For example, to use the daily country extracts +to `.env`. For example, to use the daily country extracts diffs for Ireland from Geofabrik add the following: - // base URL of the replication service - @define('CONST_Replication_Url', 'https://download.geofabrik.de/europe/ireland-and-northern-ireland-updates'); - // How often upstream publishes diffs - @define('CONST_Replication_Update_Interval', '86400'); - // How long to sleep if no update found yet - @define('CONST_Replication_Recheck_Interval', '900'); + # base URL of the replication service + NOMINATIM_REPLICATION_URL="https://download.geofabrik.de/europe/ireland-and-northern-ireland-updates" + # How often upstream publishes diffs (in seconds) + NOMINATIM_REPLICATION_UPDATE_INTERVAL=86400 + # How long to sleep if no update found yet (in seconds) + NOMINATIM_REPLICATION_RECHECK_INTERVAL=900 To set up the update process now run the following command: - ./utils/update.php --init-updates + nominatim replication --init It outputs the date where updates will start. Recheck that this date is what you expect. -The `--init-updates` command needs to be rerun whenever the replication service -is changed. +The `replication --init` command needs to be rerun whenever the replication +service is changed. + +### Updating Nominatim + +Nominatim supports different modes how to retrieve the update data from the +server. Which one you want to use depends on your exact setup and how often you +want to retrieve updates. + +These instructions are for using a single source of updates. If you have +imported multiple country extracts and want to keep them +up-to-date, [Advanced installations section](Advanced-Installations.md) +contains instructions to set up and update multiple country extracts. + +#### Continuous updates + +This is the easiest mode. Simply run the replication command without any +parameters: -#### Updating Nominatim + nominatim replication -The following command will keep your database constantly up to date: +The update application keeps running forever and retrieves and applies +new updates from the server as they are published. - ./utils/update.php --import-osmosis-all +You can run this command as a simple systemd service. Create a service +description like that in `/etc/systemd/system/nominatim-update.service`: -(Note that even though the old name "import-osmosis-all" has been kept for -compatibility reasons, Osmosis is not required to run this - it uses pyosmium -behind the scenes.) +``` +[Unit] +Description=Continuous updates of Nominatim + +[Service] +WorkingDirectory=/srv/nominatim +ExecStart=nominatim replication +StandardOutput=append:/var/log/nominatim-updates.log +StandardError=append:/var/log/nominatim-updates.error.log +User=nominatim +Group=nominatim +Type=simple + +[Install] +WantedBy=multi-user.target +``` + +Replace the `WorkingDirectory` with your project directory. Also adapt user +and group names as required. + +Now activate the service and start the updates: + +``` +sudo systemctl daemon-reload +sudo systemctl enable nominatim-updates +sudo systemctl start nominatim-updates +``` + +#### One-time mode + +When the `--once` parameter is given, then Nominatim will download exactly one +batch of updates and then exit. This one-time mode still respects the +`NOMINATIM_REPLICATION_UPDATE_INTERVAL` that you have set. If according to +the update interval no new data has been published yet, it will go to sleep +until the next expected update and only then attempt to download the next batch. + +The one-time mode is particularly useful if you want to run updates continuously +but need to schedule other work in between updates. For example, the main +service at osm.org uses it, to regularly recompute postcodes -- a process that +must not be run while updates are in progress. Its update script +looks like this: + +```sh +#!/bin/bash + +# Switch to your project directory. +cd /srv/nominatim + +while true; do + nominatim replication --once + if [ -f "/srv/nominatim/schedule-mainenance" ]; then + rm /srv/nominatim/schedule-mainenance + nominatim refresh --postcodes + fi +done +``` + +A cron job then creates the file `/srv/nominatim/need-mainenance` once per night. + + +#### Catch-up mode + +With the `--catch-up` parameter, Nominatim will immediately try to download +all changes from the server until the database is up-to-date. The catch-up mode +still respects the parameter `NOMINATIM_REPLICATION_MAX_DIFF`. It downloads and +applies the changes in appropriate batches until all is done. + +The catch-up mode is foremost useful to bring the database up to speed after the +initial import. Give that the service usually is not in production at this +point, you can temporarily be a bit more generous with the batch size and +number of threads you use for the updates by running catch-up like this: + +``` +cd /srv/nominatim +NOMINATIM_REPLICATION_MAX_DIFF=5000 nominatim replication --catch-up --threads 15 +``` -If you have imported multiple country extracts and want to keep them -up-to-date, [Advanced installations section](Advanced-Installations.md) contains instructions -to set up and update multiple country extracts. +The catch-up mode is also useful when you want to apply updates at a lower +frequency than what the source publishes. You can set up a cron job to run +replication catch-up at whatever interval you desire. + +!!! hint + When running scheduled updates with catch-up, it is a good idea to choose + a replication source with an update frequency that is an order of magnitude + lower. For example, if you want to update once a day, use an hourly updated + source. This makes sure that you don't miss an entire day of updates when + the source is unexpectely late to publish its update. + + If you want to use the source with the same update frequency (e.g. a daily + updated source with daily updates), use the + continuous update mode. It ensures to re-request the newest update until it + is published.