Merge pull request #1387 from joto/master

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

diff --git a/docs/admin/Faq.md b/docs/admin/Faq.md
index a0e1cafebc5849f328502a43f661f02b67ece61b..f06694c6948ae0bba6b09b76834bc85eae208d04 100644 (file)
--- a/docs/admin/Faq.md
+++ b/docs/admin/Faq.md
@@ -24,14 +24,14 @@ If the reported rank is 26 or higher, you can also safely add `--index-noanalyse
 
 ### 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
+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/
 
-Either add reported directories to the list or disable this setting temporarily by 
+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.
 
@@ -44,9 +44,9 @@ 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:
-  
+
     ; Defines the default timezone used by the date functions
-    ; http://php.net/date.timezone
+    ; https://php.net/date.timezone
     date.timezone = 'America/Denver'
 
 Or
@@ -71,6 +71,23 @@ and recompile (`cmake .. && make`).
 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"
 
@@ -95,11 +112,8 @@ However, you can solve this the quick and dirty way by commenting out that line
 
 ### "must be an array or an object that implements Countable" warning in /usr/share/pear/DB.php
 
-As reported starting PHP 7.2. This external DB library is no longer maintained and will be replaced in future Nominatim versions. In the meantime you'd have to manually change the line near 774 from
-`if (!count($dsn)) {` to  `if (!$dsn && !count($dsn))`. [More details](https://github.com/openstreetmap/Nominatim/issues/1184)
-
-
-
+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"
 
@@ -126,7 +140,7 @@ Example error message
    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.
 
@@ -141,7 +155,7 @@ When running SELinux, make sure that the
 
 ### Setup.php fails with "DB Error: extension not found"
 
-Make sure you have the Postgres extensions hstore and postgis installed.
+Make sure you have the PostgreSQL extensions "hstore" and "postgis" installed.
 See the installation instruction for a full list of required packages.
 
 
@@ -151,7 +165,7 @@ See the installation instruction for a full list of required packages.
 
 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.
+have the [Pear module 'DB'](https://pear.php.net/package/DB/) installed.
 
     sudo pear install DB
 
@@ -176,7 +190,7 @@ 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
-    
+
 See [this issue](https://github.com/openstreetmap/Nominatim/issues/60#issuecomment-18679446)
 for a script that runs the updates using osmosis.