drop automatic migration from versions <4.3

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

diff --git a/docs/admin/Advanced-Installations.md b/docs/admin/Advanced-Installations.md
index ee38f3e4d5dc5a452372400751c0269da9660850..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

 
 ```
 
 
 ```
 


@@ -99,71 +127,44 @@ 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.
-
-## Importing Nominatim to an external PostgreSQL database
+script ([Geofabrik](https://download.geofabrik.de)) provides daily updates.

 
 

-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.
+## Using an external PostgreSQL database

 
 

-### Option 1: Compiling the library on the database server
+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 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.
+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.

 
 

-Clone or unpack the Nominatim source code, enter the source directory and
-create and enter a build directory.
+## Moving the database to another machine

 
 

-```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.
+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.

 
 

-### Option 2: Compiling the library on the import machine
+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.

 
 

-You can also compile the normalization library on the machine from where you
-run the import.
+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.

 
 

-!!! 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.
+!!! 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.

 
 

-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>"
-```
+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.

 
 

-Now change the `NOMINATIM_DATABASE_DSN` to point to your remote server and continue
-to follow the [standard instructions for importing](/admin/Import).
+Create a project directory on your destination machine and set up the `.env`
+file to match the configuration on the source machine. That's all.