Difference between revisions of "Installation FAQ"

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Note: You are currently viewing documentation for Moodle 3.2. Up-to-date documentation for the latest stable version of Moodle is probably available here: Installation FAQ.

m (When I go to the admin page, I get told to make dirroot blank!: formatting)
m (link edits)
Line 1: Line 1:
==Uploaded files give "File not found"==
+
==Any text I add with an apostrophe (') or a quote (") causes errors or comes up with a slash added==
  
For example: Not Found: The requested URL /moodle/file.php/2/myfile.jpg was not found on this server.
+
Problems caused by apostrophes are caused by incorrect "magic quotes" settings. Moodle requires the following settings (which are usually the default):
  
Your web server needs to be configured to allow the part of the URL after a script name to be passed directly to the script. This is usually enabled in Apache 1, but is usually disabled by default in Apache 2. To turn it on, add this line to your ''httpd.conf'', or to a ''.htaccess'' file in your local directory (see [[Installing Moodle]] for more details):
+
magic_quotes_gpc = On
 +
magic_quotes_runtime = Off
  
'''AcceptPathInfo''' on
+
Please see [[Installing Moodle]] for more details.
  
Note, this will ONLY work for Apache versions 2.x.
+
==Email copies are not being sent from my forums==
  
If you are not using Apache 2 and you still have this problem (unlikely) then you can switch Moodle to use an alternative method. The disadvantages are a slight loss of performance for your users and you won't be able to use relative links within HTML resources.
+
You ''must'' set up cron properly if you want Moodle to send out automatic email from forums, assignments etc. This same process also performs a number of clean-up tasks such as deleting old unconfirmed users, unenrolling old students and so on.
  
To use this alternative method, you should change the ''slasharguments'' variable in the Operating System section of Administration >> Configuration >> [[Admin/config|Variables]]. You should now be able to access your uploaded files.
+
Basically, you need to set up a process to regularly call the script <code><nowiki>http://yoursite/admin/cron.php</nowiki></code>. Please see [[Installing_Moodle#Set_up_cron|Installing Moodle set up cron]].
  
==PHP - is it installed and what version do I have?==
+
'''Tip:''' Try the default setting in Moodle variables page. Leave the smtphost blank. This will be acceptable for the majority of users.
 
 
Make a new file on your web site called ''info.php'', containing the following text, and call it from your browser:
 
 
 
<?PHP phpinfo() ?>
 
 
 
If nothing happens then you don't have PHP installed. See the installation docs for some information about where to download it for your computer.
 
  
 
==Error: database connection failed==
 
==Error: database connection failed==
Line 31: Line 26:
 
# You are using Fedora core 3 or some other Linux system with SELinux installed and enabled. See the following URL for information on how to disable SELinux: http://fedora.redhat.com/projects/selinux/
 
# You are using Fedora core 3 or some other Linux system with SELinux installed and enabled. See the following URL for information on how to disable SELinux: http://fedora.redhat.com/projects/selinux/
  
==Why are all my pages blank?==
+
==I can't log in - I just stay stuck on the login screen==
 +
 
 +
The most common cause for this is that your own computer (not your Moodle server) has a firewall that is stripping referrer information from the browser. Here are some instructions for fixing [http://service1.symantec.com/SUPPORT/nip.nsf/46f26a2d6dafb0a788256bc7005c3fa3/b9b47ad7eddd343b88256c6b006a85a8?OpenDocument&src=bar_sch_nam Norton firewall products].
 +
 
 +
The server admin can also fix this for everyone by changing the ''secureforms'' variable to 'No' in the security section of Administration >> Configuration >> [[admin/config|Variables]].
 +
 
 +
Another possible cause of this problem is that sessions are not configured properly on the server. You can test this by calling the script <nowiki>http://yourserver/moodle/lib/session-test.php</nowiki>.
  
Check the dirroot variable in ''config.php''. You must use complete, absolute pathnames e.g.
+
==I keep getting error messages about session_start==
  
$CFG->dirroot = "d:\inetpub\sites\www.yoursite.com\web\moodle";
+
If you see errors like this:
  
Another reason might be that PHP has not been configured to support MySQL. This is common on Redhat and OpenBSD installations. In this case, an error is generated, but since error displays are often disabled by default, all that is seen on the browser is a blank screen. To determine if this is your problem, insert this as the second line in your ''config.php'' file
+
Warning: session_start() [function.session-start]: open(/tmp\sess_d40f380d37d431fc1516e9a895ad9ce0, O_RDWR) failed: No such file or directory (2) in G:\web\moodle\lib\setup.php on line 123
 +
Warning: session_start() [function.session-start]: open(/tmp\sess_d40f380d37d431fc1516e9a895ad9ce0, O_RDWR) failed: No such file or directory (2) in G:\web\moodle\lib\setup.php on line 123
 +
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at G:\web\moodle\lib\setup.php:1) in G:\web\moodle\lib\setup.php on line 123
  
phpinfo();
+
these are all related to the fact that PHP is failing to save "session" files on your hard disk (in a directory called /tmp). Usually the reason is that you don't HAVE a directory called /tmp on your computer. This is usually the case with Windows installations.
  
then reload the web page. Examine the output closely to see if MySQL is supported. If not look for a package you are missing.
+
The solution is to fix the PHP setting for this path to point to a real directory. You can do this in your ''php.ini'' file:
  
==My pages show fatal errors such as : call to undefined function: get_string()==
+
session.save_path = C:\temp
  
If you see errors like:
+
or otherwise in a ''.htaccess'' file in your main moodle directory:
  
  Parse error: parse error, unexpected T_VARIABLE in c:\program files\easyphp\www\moodle\config.php on line 94 Fatal error: Call to undefined function: get_string() in c:\program files\easyphp\www\moodle\mod\resource\lib.php on line 11
+
  php_value session.save_path "/home/moodle/sessions"
  
then it's likely you have left out a semi-colon or ending quote from a line in ''config.php'' (previous to line 94).
+
==I keep getting this error: Failed opening required '/web/moodle/lib/setup.php'==
  
Another reason could be that you have opened ''config.php'' in a program like Word to edit it, and saved it as a HTML web page, instead of a proper text file.
+
In your ''config.php'', the setting that you use for the dirroot variable must be the complete path from the root of your server's hard drive.
  
==Why do I keep getting error messages about "headers already sent"?==
+
Sometimes people only use the path from their home directory, or relative to the root of the web server directory.
  
If you see errors like this:
+
==I login but the login link doesn't change. I am logged in and can navigate freely.==
  
Warning: Cannot add header information - headers already sent by (output started at /webs/moodle/config.php:87) in /webs/moodle/lib/moodlelib.php on line 1322 Warning: Cannot add header information - headers already sent by (output started at /webs/moodle/config.php:87) in /webs/moodle/lib/moodlelib.php on line 1323 Warning: Cannot add header information - headers already sent by (output started at /webs/moodle/config.php:87) in /webs/moodle/login/index.php on line 54
+
Make sure the URL in your <code>$CFG->wwwroot</code> setting is exactly the same as the one you are actually using to access the site.
  
you have blank lines or spaces after the final <code>?></code> in your ''config.php'' file. Sometimes text editors add these - for example Notepad on Windows - so you may have to try a different text editor to remove these spaces or blank lines completely.
+
==My pages show fatal errors such as : call to undefined function: get_string()==
  
==I keep getting this error: Failed opening required '/web/moodle/lib/setup.php'==
+
If you see errors like:
  
In your ''config.php'', the setting that you use for the dirroot variable must be the complete path from the root of your server's hard drive.
+
Parse error: parse error, unexpected T_VARIABLE in c:\program files\easyphp\www\moodle\config.php on line 94 Fatal error: Call to undefined function: get_string() in c:\program files\easyphp\www\moodle\mod\resource\lib.php on line 11
  
Sometimes people only use the path from their home directory, or relative to the root of the web server directory.
+
then it's likely you have left out a semi-colon or ending quote from a line in ''config.php'' (previous to line 94).
  
==Any text I add with an apostrophe (') or a quote (") causes errors or comes up with a slash added==
+
Another reason could be that you have opened ''config.php'' in a program like Word to edit it, and saved it as a HTML web page, instead of a proper text file.
  
Problems caused by apostrophes are caused by incorrect "magic quotes" settings. Moodle requires the following settings (which are usually the default):
+
==PHP - is it installed and what version do I have?==
  
magic_quotes_gpc = On
+
Make a new file on your web site called ''info.php'', containing the following text, and call it from your browser:
magic_quotes_runtime = Off
 
  
Please see [[Installing Moodle]] for more details.
+
<?PHP phpinfo() ?>
  
==I keep getting error messages about session_start==
+
If nothing happens then you don't have PHP installed. See the installation docs for some information about where to download it for your computer.
  
If you see errors like this:
+
==Uploaded files give "File not found"==
  
Warning: session_start() [function.session-start]: open(/tmp\sess_d40f380d37d431fc1516e9a895ad9ce0, O_RDWR) failed: No such file or directory (2) in G:\web\moodle\lib\setup.php on line 123
+
For example: Not Found: The requested URL /moodle/file.php/2/myfile.jpg was not found on this server.
Warning: session_start() [function.session-start]: open(/tmp\sess_d40f380d37d431fc1516e9a895ad9ce0, O_RDWR) failed: No such file or directory (2) in G:\web\moodle\lib\setup.php on line 123
 
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at G:\web\moodle\lib\setup.php:1) in G:\web\moodle\lib\setup.php on line 123
 
  
these are all related to the fact that PHP is failing to save "session" files on your hard disk (in a directory called /tmp). Usually the reason is that you don't HAVE a directory called /tmp on your computer. This is usually the case with Windows installations.
+
Your web server needs to be configured to allow the part of the URL after a script name to be passed directly to the script. This is usually enabled in Apache 1, but is usually disabled by default in Apache 2. To turn it on, add this line to your ''httpd.conf'', or to a ''.htaccess'' file in your local directory (see [[Installing Moodle]] for more details):
  
The solution is to fix the PHP setting for this path to point to a real directory. You can do this in your ''php.ini'' file:
+
'''AcceptPathInfo''' on
  
session.save_path = C:\temp
+
Note, this will ONLY work for Apache versions 2.x.
  
or otherwise in a ''.htaccess'' file in your main moodle directory:
+
If you are not using Apache 2 and you still have this problem (unlikely) then you can switch Moodle to use an alternative method. The disadvantages are a slight loss of performance for your users and you won't be able to use relative links within HTML resources.
  
php_value session.save_path "/home/moodle/sessions"
+
To use this alternative method, you should change the ''slasharguments'' variable in the Operating System section of Administration >> Configuration >> [[admin/config|Variables]]. You should now be able to access your uploaded files.
  
 
==When I go to the admin page, I get told to make dirroot blank!==
 
==When I go to the admin page, I get told to make dirroot blank!==
Line 108: Line 108:
 
  if (!empty($dirroot) and $dirroot != $CFG->dirroot) {
 
  if (!empty($dirroot) and $dirroot != $CFG->dirroot) {
  
==I login but the login link doesn't change. I am logged in and can navigate freely.==
+
==When trying to add a resource I receive error messages==
  
Make sure the URL in your <code>$CFG->wwwroot</code> setting is exactly the same as the one you are actually using to access the site.
+
Assuming you are using Apache, then it's quite likely that your setting in ''config.php'' for <code>$CFG->wwwroot</code> is different from the actual URL you are using to access the site. Also try turning off the ''secureforms'' variable in the security section of Administration >> Configuration >> [[admin/config|Variables]].
  
==When trying to add a resource I receive error messages==
+
==Why are all my pages blank?==
  
Assuming you are using Apache, then it's quite likely that your setting in ''config.php'' for <code>$CFG->wwwroot</code> is different from the actual URL you are using to access the site. Also try turning off the ''secureforms'' variable in the security section of Administration >> Configuration >> [[Admin/config|Variables]].
+
Check the dirroot variable in ''config.php''. You must use complete, absolute pathnames e.g.
  
==I can't log in - I just stay stuck on the login screen==
+
$CFG->dirroot = "d:\inetpub\sites\www.yoursite.com\web\moodle";
  
The most common cause for this is that your own computer (not your Moodle server) has a firewall that is stripping referrer information from the browser. Here are some instructions for fixing [http://service1.symantec.com/SUPPORT/nip.nsf/46f26a2d6dafb0a788256bc7005c3fa3/b9b47ad7eddd343b88256c6b006a85a8?OpenDocument&src=bar_sch_nam Norton firewall products].
+
Another reason might be that PHP has not been configured to support MySQL. This is common on Redhat and OpenBSD installations. In this case, an error is generated, but since error displays are often disabled by default, all that is seen on the browser is a blank screen. To determine if this is your problem, insert this as the second line in your ''config.php'' file
  
The server admin can also fix this for everyone by changing the ''secureforms'' variable to 'No' in the security section of Administration >> Configuration >> [[Admin/config|Variables]].
+
phpinfo();
  
Another possible cause of this problem is that sessions are not configured properly on the server. You can test this by calling the script <nowiki>http://yourserver/moodle/lib/session-test.php</nowiki>.
+
then reload the web page. Examine the output closely to see if MySQL is supported. If not look for a package you are missing.
  
==Why doesn't my Moodle site display the time and date correctly?==
+
==Why do I keep getting error messages about "headers already sent"?==
  
Each language requires a specific language code (called a '''locale''' code) to allow dates to be displayed correctly. The language packs contain default standard codes, but sometimes these don't work on Windows servers.
+
If you see errors like this:
  
You can find the correct locale codes for Windows on these two pages: [http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_language_strings.asp Language codes] and [http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_country_strings.asp Country/region] codes (e.g. "esp_esp" for spanish)
+
Warning: Cannot add header information - headers already sent by (output started at /webs/moodle/config.php:87) in /webs/moodle/lib/moodlelib.php on line 1322 Warning: Cannot add header information - headers already sent by (output started at /webs/moodle/config.php:87) in /webs/moodle/lib/moodlelib.php on line 1323 Warning: Cannot add header information - headers already sent by (output started at /webs/moodle/config.php:87) in /webs/moodle/login/index.php on line 54
  
These new locale codes can be entered on the Administration >> Configuration >> [[Admin/config|Variables]] page, where they override the ones in the currently chosen language pack.
+
you have blank lines or spaces after the final <code>?></code> in your ''config.php'' file. Sometimes text editors add these - for example Notepad on Windows - so you may have to try a different text editor to remove these spaces or blank lines completely.
  
==Email copies are not being sent from my forums==
+
==Why doesn't my Moodle site display the time and date correctly?==
  
You ''must'' set up cron properly if you want Moodle to send out automatic email from forums, assignments etc. This same process also performs a number of clean-up tasks such as deleting old unconfirmed users, unenrolling old students and so on.
+
Each language requires a specific language code (called a '''locale''' code) to allow dates to be displayed correctly. The language packs contain default standard codes, but sometimes these don't work on Windows servers.
  
Basically, you need to set up a process to regularly call the script <code><nowiki>http://yoursite/admin/cron.php</nowiki></code>. Please see [[Installing_Moodle#Set_up_cron|Installing Moodle set up cron]].
+
You can find the correct locale codes for Windows on these two pages: [http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_language_strings.asp Language codes] and [http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_country_strings.asp Country/region] codes (e.g. "esp_esp" for spanish)
  
'''Tip:''' Try the default setting in Moodle variables page. Leave the smtphost blank. This will be acceptable for the majority of users.
+
These new locale codes can be entered on the Administration >> Configuration >> [[admin/config|Variables]] page, where they override the ones in the currently chosen language pack.
  
 
[[Category:Administrator]]
 
[[Category:Administrator]]
 
[[Category:FAQ]]
 
[[Category:FAQ]]
 
[[Category:Installation]]
 
[[Category:Installation]]

Revision as of 18:40, 22 January 2006

Any text I add with an apostrophe (') or a quote (") causes errors or comes up with a slash added

Problems caused by apostrophes are caused by incorrect "magic quotes" settings. Moodle requires the following settings (which are usually the default):

magic_quotes_gpc = On
magic_quotes_runtime = Off

Please see Installing Moodle for more details.

Email copies are not being sent from my forums

You must set up cron properly if you want Moodle to send out automatic email from forums, assignments etc. This same process also performs a number of clean-up tasks such as deleting old unconfirmed users, unenrolling old students and so on.

Basically, you need to set up a process to regularly call the script
http://yoursite/admin/cron.php
. Please see Installing Moodle set up cron.

Tip: Try the default setting in Moodle variables page. Leave the smtphost blank. This will be acceptable for the majority of users.

Error: database connection failed

If you get errors like "database connection failed" or "could not connect to the database you specified", here are some possible reasons and some possible solutions.

  1. Your database server isn't installed or running. To check this for MySQL try typing the following command line
    telnet database_host_name 3306
    . You should get a cryptic response which includes the version number of the MySQL server.
  2. You don't have the PHP mysql or postgresql extensions installed (please refer to FAQ re. whether PHP is installed).
  3. You haven't created a database for Moodle and assigned a user with the correct privileges to access it. Or the database name, database user or database user password in your Moodle configuration file config.php are incorrect. Use phpMyAdmin to set up and check your MySQL installation.
  4. You are using MySQL version 4.1 or higher, whose default password hashing algorithm is incompatible with that available in PHP versions 4.x.x. See http://dev.mysql.com/doc/mysql/en/old-client.html for further information on how to deal with this.
  5. You are using Fedora core 3 or some other Linux system with SELinux installed and enabled. See the following URL for information on how to disable SELinux: http://fedora.redhat.com/projects/selinux/

I can't log in - I just stay stuck on the login screen

The most common cause for this is that your own computer (not your Moodle server) has a firewall that is stripping referrer information from the browser. Here are some instructions for fixing Norton firewall products.

The server admin can also fix this for everyone by changing the secureforms variable to 'No' in the security section of Administration >> Configuration >> Variables.

Another possible cause of this problem is that sessions are not configured properly on the server. You can test this by calling the script http://yourserver/moodle/lib/session-test.php.

I keep getting error messages about session_start

If you see errors like this:

Warning: session_start() [function.session-start]: open(/tmp\sess_d40f380d37d431fc1516e9a895ad9ce0, O_RDWR) failed: No such file or directory (2) in G:\web\moodle\lib\setup.php on line 123
Warning: session_start() [function.session-start]: open(/tmp\sess_d40f380d37d431fc1516e9a895ad9ce0, O_RDWR) failed: No such file or directory (2) in G:\web\moodle\lib\setup.php on line 123
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at G:\web\moodle\lib\setup.php:1) in G:\web\moodle\lib\setup.php on line 123

these are all related to the fact that PHP is failing to save "session" files on your hard disk (in a directory called /tmp). Usually the reason is that you don't HAVE a directory called /tmp on your computer. This is usually the case with Windows installations.

The solution is to fix the PHP setting for this path to point to a real directory. You can do this in your php.ini file:

session.save_path = C:\temp

or otherwise in a .htaccess file in your main moodle directory:

php_value session.save_path "/home/moodle/sessions"

I keep getting this error: Failed opening required '/web/moodle/lib/setup.php'

In your config.php, the setting that you use for the dirroot variable must be the complete path from the root of your server's hard drive.

Sometimes people only use the path from their home directory, or relative to the root of the web server directory.

I login but the login link doesn't change. I am logged in and can navigate freely.

Make sure the URL in your
$CFG->wwwroot
setting is exactly the same as the one you are actually using to access the site.

My pages show fatal errors such as : call to undefined function: get_string()

If you see errors like:

Parse error: parse error, unexpected T_VARIABLE in c:\program files\easyphp\www\moodle\config.php on line 94 Fatal error: Call to undefined function: get_string() in c:\program files\easyphp\www\moodle\mod\resource\lib.php on line 11

then it's likely you have left out a semi-colon or ending quote from a line in config.php (previous to line 94).

Another reason could be that you have opened config.php in a program like Word to edit it, and saved it as a HTML web page, instead of a proper text file.

PHP - is it installed and what version do I have?

Make a new file on your web site called info.php, containing the following text, and call it from your browser:

<?PHP phpinfo() ?>

If nothing happens then you don't have PHP installed. See the installation docs for some information about where to download it for your computer.

Uploaded files give "File not found"

For example: Not Found: The requested URL /moodle/file.php/2/myfile.jpg was not found on this server.

Your web server needs to be configured to allow the part of the URL after a script name to be passed directly to the script. This is usually enabled in Apache 1, but is usually disabled by default in Apache 2. To turn it on, add this line to your httpd.conf, or to a .htaccess file in your local directory (see Installing Moodle for more details):

AcceptPathInfo on

Note, this will ONLY work for Apache versions 2.x.

If you are not using Apache 2 and you still have this problem (unlikely) then you can switch Moodle to use an alternative method. The disadvantages are a slight loss of performance for your users and you won't be able to use relative links within HTML resources.

To use this alternative method, you should change the slasharguments variable in the Operating System section of Administration >> Configuration >> Variables. You should now be able to access your uploaded files.

When I go to the admin page, I get told to make dirroot blank!

If you see errors like this:

Please fix your settings in config.php: You have: $CFG->dirroot = "/home/users/fred/public_html/moodle"; but it should be: $CFG->dirroot = "";

then you have encountered a small bug that occurs on some servers. The problem is with the error-checking mechanism, not with your actual path. To fix it, find this line (line 66) in the file admin/index.php:

if ($dirroot != $CFG->dirroot) {

and change it to this:

if (!empty($dirroot) and $dirroot != $CFG->dirroot) {

When trying to add a resource I receive error messages

Assuming you are using Apache, then it's quite likely that your setting in config.php for
$CFG->wwwroot
is different from the actual URL you are using to access the site. Also try turning off the secureforms variable in the security section of Administration >> Configuration >> Variables.

Why are all my pages blank?

Check the dirroot variable in config.php. You must use complete, absolute pathnames e.g.

$CFG->dirroot = "d:\inetpub\sites\www.yoursite.com\web\moodle";

Another reason might be that PHP has not been configured to support MySQL. This is common on Redhat and OpenBSD installations. In this case, an error is generated, but since error displays are often disabled by default, all that is seen on the browser is a blank screen. To determine if this is your problem, insert this as the second line in your config.php file

phpinfo();

then reload the web page. Examine the output closely to see if MySQL is supported. If not look for a package you are missing.

Why do I keep getting error messages about "headers already sent"?

If you see errors like this:

Warning: Cannot add header information - headers already sent by (output started at /webs/moodle/config.php:87) in /webs/moodle/lib/moodlelib.php on line 1322 Warning: Cannot add header information - headers already sent by (output started at /webs/moodle/config.php:87) in /webs/moodle/lib/moodlelib.php on line 1323 Warning: Cannot add header information - headers already sent by (output started at /webs/moodle/config.php:87) in /webs/moodle/login/index.php on line 54
you have blank lines or spaces after the final
?>
in your config.php file. Sometimes text editors add these - for example Notepad on Windows - so you may have to try a different text editor to remove these spaces or blank lines completely.

Why doesn't my Moodle site display the time and date correctly?

Each language requires a specific language code (called a locale code) to allow dates to be displayed correctly. The language packs contain default standard codes, but sometimes these don't work on Windows servers.

You can find the correct locale codes for Windows on these two pages: Language codes and Country/region codes (e.g. "esp_esp" for spanish)

These new locale codes can be entered on the Administration >> Configuration >> Variables page, where they override the ones in the currently chosen language pack.