Merge pull request #1582 from mtmail/documentation-direct-link-osm2pgsql

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

diff --git a/docs/admin/Faq.md b/docs/admin/Faq.md
index 46da7e21ba0b8384e9d3ff8c38804124a9cf6f3e..2e5a7c4334fb6e30a125af3659a63915788adeea 100644 (file)
--- a/docs/admin/Faq.md
+++ b/docs/admin/Faq.md
@@ -24,16 +24,18 @@ If the reported rank is 26 or higher, you can also safely add `--index-noanalyse
 
 ### PHP "open_basedir restriction in effect" warnings
 
 
 ### PHP "open_basedir restriction in effect" warnings
 

-    `PHP Warning:  file_get_contents(): open_basedir restriction in effect.`
+    PHP Warning:  file_get_contents(): open_basedir restriction in effect.

 
 

-You need to adjust the [open_basedir](http://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 timzeone warnings


@@ -44,9 +46,9 @@ The Apache log may contain lots of PHP warnings like this:
 You should set the default time zone as instructed in the warning in
 your `php.ini` file. Find the entry about timezone and set it to
 something like this:
 You should set the default time zone as instructed in the warning in
 your `php.ini` file. Find the entry about timezone and set it to
 something like this:

-  
+

     ; Defines the default timezone used by the date functions
     ; Defines the default timezone used by the date functions

-    ; http://php.net/date.timezone
+    ; https://php.net/date.timezone

     date.timezone = 'America/Denver'
 
 Or
     date.timezone = 'America/Denver'
 
 Or


@@ -66,11 +68,36 @@ server development libraries (`postgresql-server-dev-9.5` 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"
 
 Reinstall the nominatim functions with `setup.php --create--functions`
 and check for any errors, e.g. a missing `nominatim.so` file.
 
 ### I see the error: "function transliteration(text) does not exist"
 
 Reinstall the nominatim functions with `setup.php --create--functions`
 and check for any errors, e.g. a missing `nominatim.so` file.
 

+### I see the error: "ERROR: mmap (remap) failed"
+
+This may be a simple out-of-memory error. Try reducing the memory used
+for `--osm2pgsql-cache`. Also make sure that overcommitting memory is
+allowed: `cat /proc/sys/vm/overcommit_memory` should print 0 or 1.
+
+If you are using a flatnode file, then it may also be that the underlying
+filesystem does not fully support 'mmap'. A notable candidate is virtualbox's
+vboxfs.
+
+### 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
+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
+the import again worked.

 
 ### The website shows: "Could not get word tokens"
 
 
 ### The website shows: "Could not get word tokens"
 


@@ -82,10 +109,11 @@ to get the full error message.
 
 `could not connect to server: No such file or directory`
 
 
 `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).
+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
 
 
 However, you can solve this the quick and dirty way by commenting out that line and then run
 


@@ -95,7 +123,10 @@ However, you can solve this the quick and dirty way by commenting out that line
 
 ### 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.
 


@@ -118,7 +149,7 @@ Example error message
    CONTEXT: PL/pgSQL function make_standard_name(text) line 5 at assignment]
 ```
 
    CONTEXT: PL/pgSQL function make_standard_name(text) line 5 at assignment]
 ```
 

-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, e.g.
 


@@ -133,19 +164,9 @@ When running SELinux, make sure that the
 
 ### Setup.php fails with "DB Error: extension not found"
 
 
 ### Setup.php fails with "DB Error: extension not found"
 

-Make sure you have the Postgres extensions hstore and postgis installed.
-See the installation instruction for a full list of required packages.
-
-
-### Setup.php reports "Cannot redeclare getDB()"
+Make sure you have the PostgreSQL extensions "hstore" and "postgis" installed.
+See the installation instructions for a full list of required packages.

 
 

-`Cannot redeclare getDB() (previously declared in /your/path/Nominatim/lib/db.php:4)`
-
-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'](http://pear.php.net/package/DB/) installed.
-
-    sudo pear install DB

 
 ### I forgot to delete the flatnodes file before starting an import.
 
 
 ### I forgot to delete the flatnodes file before starting an import.
 


@@ -168,7 +189,7 @@ 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
 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.
 
 See [this issue](https://github.com/openstreetmap/Nominatim/issues/60#issuecomment-18679446)
 for a script that runs the updates using osmosis.