use line interpolation to create centroid for lines

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

diff --git a/docs/admin/Advanced-Installations.md b/docs/admin/Advanced-Installations.md
index 08c059841f48df4d40f45f1eef74f629f8b5d91f..de3c5876984ce85e5ea48208b337cf4fa70898c4 100644 (file)
--- a/docs/admin/Advanced-Installations.md
+++ b/docs/admin/Advanced-Installations.md
@@ -5,6 +5,35 @@ 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 with a database user without superuser rights
+
+Nominatim usually creates its own PostgreSQL database at the beginning of the
+import process. This makes usage easier for the user but means that the
+database user doing the import needs the appropriate rights.
+
+If you prefer to run the import with a database user with limited rights,
+you can do so by changing the import process as follows:
+
+1. Run the command for database preparation with a database user with
+   superuser rights. For example, to use a db user 'dbadmin' for a
+   database 'nominatim', execute:
+
+   ```
+   NOMINATIM_DATABASE_DSN="pgsql:dbname=nominatim;user=dbadmin" nominatim import --prepare-database
+   ```
+
+2. Grant the import user the right to create tables. For example, foe user 'import-user':
+
+   ```
+   psql -d nominatim -c 'GRANT CREATE ON SCHEMA public TO "import-user"'
+   ```
+
+3. Now run the reminder of the import with the import user:
+
+   ```
+   NOMINATIM_DATABASE_DSN="pgsql:dbname=nominatim;user=import-user" nominatim import --continue import-from-file --osm-file file.pbf
+   ```
+

 ## Importing multiple regions (without updates)
 
 To import multiple regions in your database you can simply give multiple
 ## Importing multiple regions (without updates)
 
 To import multiple regions in your database you can simply give multiple


@@ -36,16 +65,15 @@ which has the following structure:
 
 ```bash
 update
 
 ```bash
 update

-    ├── europe
-    │   ├── andorra
-    │   │   └── sequence.state
-    │   └── monaco
-    │       └── sequence.state
-    └── tmp
-        └── europe
-                ├── andorra-latest.osm.pbf
-                └── monaco-latest.osm.pbf
-
+ ├── europe
+ │    ├── andorra
+ │    │    └── sequence.state
+ │    └── monaco
+ │         └── sequence.state
+ └── tmp
+      └── europe
+           ├── andorra-latest.osm.pbf
+           └── monaco-latest.osm.pbf

 
 ```
 
 
 ```
 


@@ -99,80 +127,17 @@ Change into the project directory and run the following command:
 
 This will get diffs from the replication server, import diffs and index
 the database. The default replication server in the
 
 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.
+script ([Geofabrik](https://download.geofabrik.de)) provides daily updates.

 
 ## Using an external PostgreSQL database
 
 
 ## Using an external PostgreSQL database
 

-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.
-
-!!! note
-    The external module is only needed when using the legacy tokenizer.
-    If you have chosen the ICU tokenizer, then you can ignore this section
-    and follow the standard import documentation.
-
-### Option 1: Compiling the library on the database server
-
-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.
-
-Clone or unpack the Nominatim source code, enter the source directory and
-create and enter a build directory.
-
-```sh
-cd Nominatim
-mkdir build
-cd build
-```
-
-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).
+You can install Nominatim using a database that runs on a different server.
+Simply point the configuration variable `NOMINATIM_DATABASE_DSN` to the
+server and follow the standard import documentation.

 
 

+The import will be faster, if the import is run directly from the database
+machine. You can easily switch to a different machine for the query frontend
+after the import.

 
 ## Moving the database to another machine
 
 
 ## Moving the database to another machine
 


@@ -197,20 +162,9 @@ target machine.
     data updates but the resulting database is only about a third of the size
     of a full database.
 
     data updates but the resulting database is only about a third of the size
     of a full database.
 

-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.
+Next install nominatim-api on the target machine by following the standard
+installation instructions. Again, make sure to use the same version as the
+source machine.

 
 Create a project directory on your destination machine and set up the `.env`
 
 Create a project directory on your destination machine and set up the `.env`

-file to match the configuration on the source machine. Finally run
-
-    nominatim refresh --website
-
-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 rerun
-
-   nominatim refresh --functions
-
-on the target machine to update the the location of the module.
+file to match the configuration on the source machine. That's all.