correctly handle single-point interpolations in reverse

[nominatim.git] / docs / admin / Advanced-Installations.md

diff --git a/docs/admin/Advanced-Installations.md b/docs/admin/Advanced-Installations.md
index b22d9a6179e32410e568ae237e12bcc27b05b083..ff267cee28bd45f9d15fdbef4eb4ddc83a1ddaed 100644 (file)
--- a/docs/admin/Advanced-Installations.md
+++ b/docs/admin/Advanced-Installations.md
@@ -5,9 +5,34 @@ your Nominatim database. It is assumed that you have already successfully
 installed the Nominatim software itself, if not return to the 
 [installation page](Installation.md).
 
 installed the Nominatim software itself, if not return to the 
 [installation page](Installation.md).
 

-## Importing multiple regions
+## Importing multiple regions (without updates)

 
 

-To import multiple regions in your database, you need to configure and run `utils/import_multiple_regions.sh` file. This script will set up the update directory which has the following structure:
+To import multiple regions in your database you can simply give multiple
+OSM files to the import command:
+
+```
+nominatim import --osm-file file1.pbf --osm-file file2.pbf
+```
+
+If you already have imported a file and want to add another one, you can
+use the add-data function to import the additional data as follows:
+
+```
+nominatim add-data --file <FILE>
+nominatim refresh --postcodes
+nominatim index -j <NUMBER OF THREADS>
+```
+
+Please note that adding additional data is always significantly slower than
+the original import.
+
+## Importing multiple regions (with updates)
+
+If you want to import multiple regions _and_ be able to keep them up-to-date
+with updates, then you can use the scripts provided in the `utils` directory.
+
+These scripts will set up an `update` directory in your project directory,
+which has the following structure:

 
 ```bash
 update
 
 ```bash
 update


@@ -17,7 +42,6 @@ update
     │   └── monaco
     │       └── sequence.state
     └── tmp
     │   └── monaco
     │       └── sequence.state
     └── tmp

-        ├── combined.osm.pbf

         └── europe
                 ├── andorra-latest.osm.pbf
                 └── monaco-latest.osm.pbf
         └── europe
                 ├── andorra-latest.osm.pbf
                 └── monaco-latest.osm.pbf


@@ -25,85 +49,167 @@ update
 
 ```
 
 
 ```
 

-The `sequence.state` files will contain the sequence ID, which will be used by pyosmium to get updates. The tmp folder is used for import dump.
+The `sequence.state` files contain the sequence ID for each region. They will
+be used by pyosmium to get updates. The `tmp` folder is used for import dump and
+can be deleted once the import is complete.

 
 

-### Configuring multiple regions

 
 

-The file `import_multiple_regions.sh` needs to be edited as per your requirement:
+### Setting up multiple regions

 
 

-1. List of countries. eg:
+Create a project directory as described for the
+[simple import](Import.md#creating-the-project-directory). If necessary,
+you can also add an `.env` configuration with customized options. In particular,
+you need to make sure that `NOMINATIM_REPLICATION_UPDATE_INTERVAL` and
+`NOMINATIM_REPLICATION_RECHECK_INTERVAL` are set according to the update
+interval of the extract server you use.

 
 

-        COUNTRIES="europe/monaco europe/andorra"
+Copy the scripts `utils/import_multiple_regions.sh` and `utils/update_database.sh`
+into the project directory.
+
+Now customize both files as per your requirements

 
 

-2. Path to Build directory. eg:
+1. List of countries. e.g.

 
 

-        NOMINATIMBUILD="/srv/nominatim/build"
+        COUNTRIES="europe/monaco europe/andorra"

 
 

-3. Path to Update directory. eg:
-        
-        UPDATEDIR="/srv/nominatim/update"
+2. URL to the service providing the extracts and updates. eg:

 
 

-4. Replication URL. eg:
-    

         BASEURL="https://download.geofabrik.de"
         DOWNCOUNTRYPOSTFIX="-latest.osm.pbf"
         BASEURL="https://download.geofabrik.de"
         DOWNCOUNTRYPOSTFIX="-latest.osm.pbf"

- 
-!!! tip
-    If your database already exists and you want to add more countries, replace the setting up part
-    `${SETUPFILE} --osm-file ${UPDATEDIR}/tmp/combined.osm.pbf --all 2>&1`
-    with `${UPDATEFILE} --import-file ${UPDATEDIR}/tmp/combined.osm.pbf 2>&1`.

 
 

-### Setting up multiple regions
+5. Followup in the update script can be set according to your installation.
+   E.g. for Photon,

 
 

-Run the following command from your Nominatim directory after configuring the file.
+        FOLLOWUP="curl http://localhost:2322/nominatim-update"

 
 

-    bash ./utils/import_multiple_regions.sh
+    will handle the indexing.

 
 

-!!! danger "Important"
-        This file uses osmium-tool. It must be installed before executing the import script.
-        Installation instructions can be found [here](https://osmcode.org/osmium-tool/manual.html#installation).

 
 

-## Updating multiple regions
+To start the initial import, change into the project directory and run

 
 

-To import multiple regions in your database, you need to configure and run ```utils/update_database.sh```.
-This uses the update directory set up while setting up the DB.   
+```
+    bash import_multiple_regions.sh
+```

 
 

-### Configuring multiple regions
+### Updating the database

 
 

-The file `update_database.sh` needs to be edited as per your requirement:
+Change into the project directory and run the following command:

 
 

-1. List of countries. eg:
+    bash update_database.sh

 
 

-        COUNTRIES="europe/monaco europe/andorra"
+This will get diffs from the replication server, import diffs and index
+the database. The default replication server in the
+script([Geofabrik](https://download.geofabrik.de)) provides daily updates.

 
 

-2. Path to Build directory. eg:
+## Using an external PostgreSQL database

 
 

-        NOMINATIMBUILD="/srv/nominatim/build"
+You can install Nominatim using a database that runs on a different server when
+you have physical access to the file system on the other server. Nominatim
+uses a custom normalization library that needs to be made accessible to the
+PostgreSQL server. This section explains how to set up the normalization
+library.

 
 

-3. Path to Update directory. eg:
-        
-        UPDATEDIR="/srv/nominatim/update"
+!!! note
+    The external module is only needed when using the legacy tokenizer.
+    If you have choosen the ICU tokenizer, then you can ignore this section
+    and follow the standard import documentation.

 
 

-4. Replication URL. eg:
-    
-        BASEURL="https://download.geofabrik.de"
-        DOWNCOUNTRYPOSTFIX="-updates"
+### Option 1: Compiling the library on the database server

 
 

-5. Followup can be set according to your installation. eg: For Photon,
+The most sure way to get a working library is to compile it on the database
+server. From the prerequisites you need at least cmake, gcc and the
+PostgreSQL server package.

 
 

-        FOLLOWUP="curl http://localhost:2322/nominatim-update"
+Clone or unpack the Nominatim source code, enter the source directory and
+create and enter a build directory.

 
 

-    will handle the indexing.
+```sh
+cd Nominatim
+mkdir build
+cd build
+```

 
 

-### Updating the database
+Now configure cmake to only build the PostgreSQL module and build it:
+
+```
+cmake -DBUILD_IMPORTER=off -DBUILD_API=off -DBUILD_TESTS=off -DBUILD_DOCS=off -DBUILD_OSM2PGSQL=off ..
+make
+```
+
+When done, you find the normalization library in `build/module/nominatim.so`.
+Copy it to a place where it is readable and executable by the PostgreSQL server
+process.
+
+### Option 2: Compiling the library on the import machine
+
+You can also compile the normalization library on the machine from where you
+run the import.
+
+!!! important
+    You can only do this when the database server and the import machine have
+    the same architecture and run the same version of Linux. Otherwise there is
+    no guarantee that the compiled library is compatible with the PostgreSQL
+    server running on the database server.
+
+Make sure that the PostgreSQL server package is installed on the machine
+**with the same version as on the database server**. You do not need to install
+the PostgreSQL server itself.
+
+Download and compile Nominatim as per standard instructions. Once done, you find
+the normalization library in `build/module/nominatim.so`. Copy the file to
+the database server at a location where it is readable and executable by the
+PostgreSQL server process.
+
+### Running the import
+
+On the client side you now need to configure the import to point to the
+correct location of the library **on the database server**. Add the following
+line to your your `.env` file:
+
+```php
+NOMINATIM_DATABASE_MODULE_PATH="<directory on the database server where nominatim.so resides>"
+```
+
+Now change the `NOMINATIM_DATABASE_DSN` to point to your remote server and continue
+to follow the [standard instructions for importing](Import.md).
+
+
+## Moving the database to another machine
+
+For some configurations it may be useful to run the import on one machine, then
+move the database to another machine and run the Nominatim service from there.
+For example, you might want to use a large machine to be able to run the import
+quickly but only want a smaller machine for production because there is not so
+much load. Or you might want to do the import once and then replicate the
+database to many machines.
+
+The important thing to keep in mind when transferring the Nominatim installation
+is that you need to transfer the database _and the project directory_. Both
+parts are essential for your installation.
+
+The Nominatim database can be transferred using the `pg_dump`/`pg_restore` tool.
+Make sure to use the same version of PostgreSQL and PostGIS on source and
+target machine.

 
 

-Run the following command from your Nominatim directory after configuring the file.
+!!! note
+    Before creating a dump of your Nominatim database, consider running
+    `nominatim freeze` first. Your database looses the ability to receive further
+    data updates but the resulting database is only about a third of the size
+    of a full database.

 
 

-    bash ./utils/update_database.sh
+Next install Nominatim on the target machine by following the standard installation
+instructions. Again make sure to use the same version as the source machine.

 
 

-This will get diffs from the replication server, import diffs and index the database. The default replication server in the script([Geofabric](https://download.geofabrik.de)) provides daily updates.
+You can now copy the project directory from the source machine to the new machine.
+If necessary, edit the `.env` file to point it to the restored database.
+Finally run

 
 

-## Verification and further setup
+    nominatim refresh --website

 
 

-Instructions for import verification and other details like importing Wikidata can be found in [import and update page](Import-and-Update.md)
+to make sure that the local installation of Nominatim will be used.

 
 

+If you are using the legacy tokenizer you might also have to switch to the
+PostgreSQL module that was compiled on your target machine. If you get errors
+that PostgreSQL cannot find or access `nominatim.so` then copy the installed
+version into the `module` directory of your project directory. The installed
+copy can usually be found under `/usr/local/lib/nominatim/module/nominatim.so`.