Merge pull request #2633 from lonvia/fix-reverse-single-interpolation-point

[nominatim.git] / docs / admin / Faq.md

diff --git a/docs/admin/Faq.md b/docs/admin/Faq.md
index f06694c6948ae0bba6b09b76834bc85eae208d04..5737cef5540c5a3a4887a7f0fdb67c8ddbb1bb76 100644 (file)
--- a/docs/admin/Faq.md
+++ b/docs/admin/Faq.md
@@ -16,27 +16,44 @@ was killed. If it looks like this:
 then you can resume with the following command:
 
 ```sh
 then you can resume with the following command:
 
 ```sh

-./utils/setup.php --index --create-search-indices --create-country-names
+nominatim import --continue indexing

 ```
 
 If the reported rank is 26 or higher, you can also safely add `--index-noanalyse`.
 
 
 ```
 
 If the reported rank is 26 or higher, you can also safely add `--index-noanalyse`.
 
 

+### PostgreSQL crashed "invalid page in block"
+
+Usually serious problem, can be a hardware issue, not all data written to disc
+for example. Check PostgreSQL log file and search PostgreSQL issues/mailing
+list for hints.
+
+If it happened during index creation you can try rerunning the step with
+
+```sh
+nominatim import --continue indexing
+```
+
+Otherwise it's best to start the full setup from the beginning.
+
+

 ### PHP "open_basedir restriction in effect" warnings
 
     PHP Warning:  file_get_contents(): open_basedir restriction in effect.
 
 ### PHP "open_basedir restriction in effect" warnings
 
     PHP Warning:  file_get_contents(): open_basedir restriction in effect.
 

-You need to adjust the [open_basedir](https://www.php.net/manual/en/ini.core.php#ini.open-basedir) setting
-in your PHP configuration (`php.ini file`). By default this setting may look like this:
+You need to adjust the
+[open_basedir](https://www.php.net/manual/en/ini.core.php#ini.open-basedir)
+setting in your PHP configuration (`php.ini` file). By default this setting may
+look like this:

 
     open_basedir = /srv/http/:/home/:/tmp/:/usr/share/pear/
 
 
     open_basedir = /srv/http/:/home/:/tmp/:/usr/share/pear/
 

-Either add reported directories to the list or disable this setting temporarily by
-dding ";" at the beginning of the line. Don't forget to enable this setting again
-once you are done with the PHP command line operations.
+Either add reported directories to the list or disable this setting temporarily
+by adding ";" at the beginning of the line. Don't forget to enable this setting
+again once you are done with the PHP command line operations.

 
 
 
 

-### PHP timzeone warnings
+### PHP timezeone warnings

 
 The Apache log may contain lots of PHP warnings like this:
     `PHP Warning:  date_default_timezone_set() function.`
 
 The Apache log may contain lots of PHP warnings like this:
     `PHP Warning:  date_default_timezone_set() function.`


@@ -62,13 +79,21 @@ When running the import you may get a version mismatch:
 
 pg_config seems to use bad includes sometimes when multiple versions
 of PostgreSQL are available in the system. Make sure you remove the
 
 pg_config seems to use bad includes sometimes when multiple versions
 of PostgreSQL are available in the system. Make sure you remove the

-server development libraries (`postgresql-server-dev-9.5` on Ubuntu)
+server development libraries (`postgresql-server-dev-13` on Ubuntu)

 and recompile (`cmake .. && make`).
 
 
 and recompile (`cmake .. && make`).
 
 

+### I see the error "ERROR: permission denied for language c"
+
+`nominatim.so`, written in C, is required to be installed on the database
+server. Some managed database (cloud) services like Amazon RDS do not allow
+this. There is currently no work-around other than installing a database
+on a non-managed machine.
+
+

 ### I see the error: "function transliteration(text) does not exist"
 
 ### I see the error: "function transliteration(text) does not exist"
 

-Reinstall the nominatim functions with `setup.php --create--functions`
+Reinstall the nominatim functions with `nominatim refresh --functions`

 and check for any errors, e.g. a missing `nominatim.so` file.
 
 ### I see the error: "ERROR: mmap (remap) failed"
 and check for any errors, e.g. a missing `nominatim.so` file.
 
 ### I see the error: "ERROR: mmap (remap) failed"


@@ -83,7 +108,8 @@ vboxfs.
 
 ### nominatim UPDATE failed: ERROR: buffer 179261 is not owned by resource owner Portal
 
 
 ### nominatim UPDATE failed: ERROR: buffer 179261 is not owned by resource owner Portal
 

-Several users [reported this](https://github.com/openstreetmap/Nominatim/issues/1168) during the initial import of the database. It's
+Several users [reported this](https://github.com/openstreetmap/Nominatim/issues/1168)
+during the initial import of the database. It's

 something PostgreSQL internal Nominatim doesn't control. And PostgreSQL forums
 suggest it's threading related but definitely some kind of crash of a process.
 Users reported either rebooting the server, different hardware or just trying
 something PostgreSQL internal Nominatim doesn't control. And PostgreSQL forums
 suggest it's threading related but definitely some kind of crash of a process.
 Users reported either rebooting the server, different hardware or just trying


@@ -95,29 +121,12 @@ The server cannot access your database. Add `&debug=1` to your URL
 to get the full error message.
 
 
 to get the full error message.
 
 

-### On CentOS the website shows "Could not connect to server"
-
-`could not connect to server: No such file or directory`
-
-On CentOS v7 the PostgreSQL server is started with `systemd`.
-Check if `/usr/lib/systemd/system/httpd.service` contains a line `PrivateTmp=true`.
-If so then Apache cannot see the `/tmp/.s.PGSQL.5432` file. It's a good security feature,
-so use the [preferred solution](../appendix/Install-on-Centos-7/#adding-selinux-security-settings).
-
-However, you can solve this the quick and dirty way by commenting out that line and then run
-
-    sudo systemctl daemon-reload
-    sudo systemctl restart httpd
-
-
-### "must be an array or an object that implements Countable" warning in /usr/share/pear/DB.php
-
-The warning started with PHP 7.2. Make sure you have at least [version 1.9.3 of PEAR DB](https://github.com/pear/DB/releases)
-installed.
-

 ### Website reports "DB Error: insufficient permissions"
 
 ### Website reports "DB Error: insufficient permissions"
 

-The user the webserver, e.g. Apache, runs under needs to have access to the Nominatim database. You can find the user like [this](https://serverfault.com/questions/125865/finding-out-what-user-apache-is-running-as), for default Ubuntu operating system for example it's `www-data`.
+The user the webserver, e.g. Apache, runs under needs to have access to the
+Nominatim database. You can find the user like
+[this](https://serverfault.com/questions/125865/finding-out-what-user-apache-is-running-as),
+for default Ubuntu operating system for example it's `www-data`.

 
 1. Repeat the `createuser` step of the installation instructions.
 
 
 1. Repeat the `createuser` step of the installation instructions.
 


@@ -142,7 +151,8 @@ Example error message
 
 The PostgreSQL database, i.e. user `postgres`, needs to have access to that file.
 
 
 The PostgreSQL database, i.e. user `postgres`, needs to have access to that file.
 

-The permission need to be read & executable by everybody, e.g.
+The permission need to be read & executable by everybody, but not writeable
+by everybody, e.g.

 
 ```
    -rwxr-xr-x 1 nominatim nominatim 297984 build/module/nominatim.so
 
 ```
    -rwxr-xr-x 1 nominatim nominatim 297984 build/module/nominatim.so


@@ -151,57 +161,33 @@ The permission need to be read & executable by everybody, e.g.
 Try `chmod a+r nominatim.so; chmod a+x nominatim.so`.
 
 When running SELinux, make sure that the
 Try `chmod a+r nominatim.so; chmod a+x nominatim.so`.
 
 When running SELinux, make sure that the

-[context is set up correctly](../appendix/Install-on-Centos-7/#adding-selinux-security-settings).
+[context is set up correctly](../appendix/Install-on-Centos-8.md#adding-selinux-security-settings).

 
 

-### Setup.php fails with "DB Error: extension not found"
-
-Make sure you have the PostgreSQL extensions "hstore" and "postgis" installed.
-See the installation instruction for a full list of required packages.
+When you recently updated your operating system, updated PostgreSQL to
+a new version or moved files (e.g. the build directory) you should
+recreate `nominatim.so`. Try

 
 

+```
+   cd build
+   rm -r module/
+   cmake $main_Nominatim_path && make
+```

 
 

-### Setup.php reports "Cannot redeclare getDB()"
-
-`Cannot redeclare getDB() (previously declared in /your/path/Nominatim/lib/db.php:4)`
+### Setup.php fails with "DB Error: extension not found"

 
 

-The message is a bit misleading as PHP needs to load the file `DB.php` and
-instead re-loads Nominatim's `db.php`. To solve this make sure you
-have the [Pear module 'DB'](https://pear.php.net/package/DB/) installed.
+Make sure you have the PostgreSQL extensions "hstore" and "postgis" installed.
+See the installation instructions for a full list of required packages.

 
 

-    sudo pear install DB

 
 ### I forgot to delete the flatnodes file before starting an import.
 
 That's fine. For each import the flatnodes file get overwritten.
 
 ### I forgot to delete the flatnodes file before starting an import.
 
 That's fine. For each import the flatnodes file get overwritten.

-See [https://help.openstreetmap.org/questions/52419/nominatim-flatnode-storage]()
+See [https://help.openstreetmap.org/questions/52419/nominatim-flatnode-storage](https://help.openstreetmap.org/questions/52419/nominatim-flatnode-storage)

 for more information.
 
 
 ## Running your own instance
 
 for more information.
 
 
 ## Running your own instance
 

-### Can I import multiple countries and keep them up to date?
-
-You should use the extracts and updates from https://download.geofabrik.de.
-For the initial import, download the countries you need and merge them.
-See [OSM Help](https://help.openstreetmap.org/questions/48843/merging-two-or-more-geographical-areas-to-import-two-or-more-osm-files-in-nominatim)
-for examples how to do that. Use the resulting single osm file when
-running `setup.php`.
-
-For updates you need to download the change files for each country
-once per day and apply them **separately** using
-
-    ./utils/update.php --import-diff <filename> --index
-
-See [this issue](https://github.com/openstreetmap/Nominatim/issues/60#issuecomment-18679446)
-for a script that runs the updates using osmosis.
-

 ### Can I import negative OSM ids into Nominatim?
 
 See [this question of Stackoverflow](https://help.openstreetmap.org/questions/64662/nominatim-flatnode-with-negative-id).
 ### Can I import negative OSM ids into Nominatim?
 
 See [this question of Stackoverflow](https://help.openstreetmap.org/questions/64662/nominatim-flatnode-with-negative-id).

-
-### Missing XML or text declaration
-
-The website might show: `XML Parsing Error: XML or text declaration not at start of entity Location.`
-
-Make sure there are no spaces at the beginning of your `settings/local.php` file.
-
-