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    [Rev 4201] blank page when trying to install/update database schema

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    • S
      Stefan Kaegi
      last edited by

      My changed FOGBase.class.php file:
      FOGBase.class.php

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      • S
        Sebastian Roth Moderator
        last edited by

        @Stefan-Kaegi said:

        I added the line ‘protected $debug = true;’ to my FOGBase.class.php in section ‘abstract class FOGBase’

        PHP is not happy if you add another variable with the same name. Just change the value from ‘false’ to ‘true’. Don’t worry about it being ‘public’ or ‘protected’. This was changed by Tom at some point. Just change its value and see what you get.

        Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

        Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

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        • S
          Stefan Kaegi
          last edited by

          I changed FOGBase.class.php as you described. Here is my Apache Error Log as it looks now:
          error.log

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          • S
            Sebastian Roth Moderator
            last edited by

            If something goes wrong with the database connection you should be seeing this on the web interface (top left). Like this:
            debug_output.png

            Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

            Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

            1 Reply Last reply Reply Quote 1
            • S
              Stefan Kaegi
              last edited by

              I don’t see anything on the webinterface. Still a blank page.

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              • S
                Sebastian Roth Moderator
                last edited by

                I am kind of lost with this. Apache error log tells us that it cannot issue a query from a null object which means that the DB object is not properly initialized. But why don’t you see any errors from the inizialisation code?? @Tom-Elliott Any ideas?

                The “Backing up database” issue should be solved as far as I know. Please update and try again. After running the installer your changes in /var/www/html/fog/lib/fog/FOGBase.class.php will be lost. You might want to enable debug again and see what you get.

                Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

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                • S
                  Stefan Kaegi
                  last edited by

                  I updated again to Rev 4278 . But the Installer stills stopps at ‘Backing up database’.

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                  • S
                    Sebastian Roth Moderator
                    last edited by Sebastian Roth

                    Wohoo, didn’t pay enough attention when reading this. I had a different issue in mind but it’s unrelated (https://forums.fogproject.org/topic/5972/rev-5020-upgrade-error), sorry for that.

                    “Backing up database” is done via wget requesting a database export from the web interface. Sure this is not working in your case as we still haven’t tracked down the real cause of your grumpy DB connection. So you need to modify the installer script I am afraid. Open trunk/bin/installfog.sh in an editor and see if you can find this lines (should be around 440):

                    ...
                                dots "Backing up database"
                                if [ -d "$backupPath/fog_web_${version}.BACKUP" ]; then
                                    if [ ! -d "$backupPath/fogDBbackups" ]; then
                                        mkdir -p $backupPath/fogDBbackups >/dev/null 2>&1
                                    fi
                                    wget --no-check-certificate -O $backupPath/fogDBbackups/fog_sql...
                                fi
                                errorStat $?
                    ...
                    

                    Simply add a comment sign (#) in front of the wget command, save the file and run the installer again. I hope this time it’ll run till the end.

                    Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                    Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                    Tom ElliottT 1 Reply Last reply Reply Quote 0
                    • Tom ElliottT
                      Tom Elliott @Sebastian Roth
                      last edited by

                      @Uncle-Frank said:

                      ?
                      …

                      Or maybe update? I added back the db dump code and have the installer using that instead of the php native versions. This should operate as it isn’t passing the db lines into memory. I could be wrong though.

                      Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

                      Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                      Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

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                      • Tom ElliottT
                        Tom Elliott
                        last edited by

                        This doesn’t make sense. The sqldump code is not the problem. It is the Config.class.php. It’s failing to download the file because it cannot access the db, which seems to be the trend throughout this entire post.

                        Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

                        Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                        Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                        S 1 Reply Last reply Reply Quote 0
                        • S
                          Stefan Kaegi
                          last edited by

                          After commenting out the wget line the installer run till the end. I didn’t need to change FOGBase.class.php after running the installer. ‘public $debug’ was still set on ‘true’. The Apache Error Log File still looks the same:

                          [Tue Nov 03 12:00:04 2015] [error] [client 172.20.60.23] PHP Fatal error:  Call to a member function query() on null in /var/www/html/fog/lib/fog/FOGCore.class.php on line 310
                          [Tue Nov 03 12:00:04 2015] [error] [client 172.30.60.49] PHP Fatal error:  Call to a member function query() on null in /var/www/html/fog/lib/fog/FOGCore.class.php on line 310
                          [Tue Nov 03 12:00:04 2015] [error] [client 172.20.60.56] PHP Fatal error:  Call to a member function query() on null in /var/www/html/fog/lib/fog/FOGCore.class.php on line 310
                          
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                          • S
                            Sebastian Roth Moderator @Tom Elliott
                            last edited by

                            @Tom-Elliott said:

                            This doesn’t make sense. The sqldump code is not the problem. It is the Config.class.php. It’s failing to download the file because it cannot access the db, which seems to be the trend throughout this entire post.

                            Good point! But why don’t we see any other error messages related to the DB connection??

                            Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                            Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                            Tom ElliottT 1 Reply Last reply Reply Quote 0
                            • Wayne WorkmanW
                              Wayne Workman
                              last edited by Wayne Workman

                              Is there a DB password set? If so, is the installer correctly reading the password? For instance, special characters like single quotes can totally screw up the reading of the password from /opt/fog/.fogsettings.

                              Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
                              Daily Clean Installation Results:
                              https://fogtesting.fogproject.us/
                              FOG Reporting:
                              https://fog-external-reporting-results.fogproject.us/

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                              • Tom ElliottT
                                Tom Elliott @Sebastian Roth
                                last edited by

                                @Sebastian-Roth because it is being returned as null, there isn’t anything to connect.

                                Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

                                Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                                S 1 Reply Last reply Reply Quote 0
                                • S
                                  Sebastian Roth Moderator @Tom Elliott
                                  last edited by

                                  @Tom-Elliott said:

                                  because it is being returned as null, there isn’t anything to connect.

                                  Sure! But why don’t we see an error when enabling debug in FOGBase class? We need to have it show errors in case the connection goes wrong. Otherwise we just don’t know… Very hard to debug this kind of stuff with users going forth and back about apache log and all that.

                                  Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                  Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                                  Tom ElliottT 1 Reply Last reply Reply Quote 0
                                  • S
                                    Stefan Kaegi
                                    last edited by

                                    A mysql password ist set. Here is my .fogsettings file:
                                    fogsettings

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                                    • Tom ElliottT
                                      Tom Elliott @Sebastian Roth
                                      last edited by

                                      @Sebastian-Roth that’s what I mean. The reason the screen goes blank is it is attempting to use a method that is not available. Debug works if the item still has all the methods available to it. In this particular case, there is no method available to the defined item. So php is failing entirely, as it never gets to use the method as it is not available, at all.

                                      I think maybe visibility is needed?

                                      Let use fogbase as the example. I define all the variables using a reference rather than making a copy of the already existing object. So for all purposes of understanding I can muster.

                                      The DB variable, which makes our connection to the DB available to the entirety of fog. If an item is called requiring the use of an object that hasn’t been instantiated, but calls a method that obviously needs instantiation first, you will get a fatal error on php.

                                      Most of the time this is not the problem, but every once in a while weird things can happen. Only methods that are properly instantiated can access it’s relevant methods.

                                      So DB->query(‘some query’) called before the DB variable has been givin the object it requires will cause blank screen.

                                      I can try to test every possible case but it’s not always so simple either.

                                      Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

                                      Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                      Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

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                                      • S
                                        Sebastian Roth Moderator
                                        last edited by Sebastian Roth

                                        @Tom-Elliott You know the code a lot better than I do! And I am sure you are right about it failing (blank page) if query is called before DB object being properly initialized. But that’s my point. It should be initialized before and it usually does in most cases. But if it does not, it would be awesome so see an error message straight away. Not sure if it’s possible but we might be able to add a kind of fail-proof check right after initializing and dump an error message in case something went wrong (driver not installed, whatever).

                                        Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                        Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                                        Tom ElliottT 1 Reply Last reply Reply Quote 1
                                        • S
                                          Sebastian Roth Moderator
                                          last edited by

                                          Re-reading the thread I saw this…

                                          @Stefan-Kaegi said:

                                          After commenting out the wget line the installer run till the end. I didn’t need to change FOGBase.class.php after running the installer. ‘public $debug’ was still set on ‘true’.

                                          Are you sure the installer propagated the web interface files properly? Could you please post the output of the following commands:

                                          ls -al /var/www
                                          ...
                                          ls -al /var/www/html
                                          ...
                                          ls -al /var/www/html/fog
                                          ...
                                          

                                          Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                          Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                                          1 Reply Last reply Reply Quote 0
                                          • Tom ElliottT
                                            Tom Elliott @Sebastian Roth
                                            last edited by

                                            @Sebastian-Roth I think where the issue resides in this is I do display an error. But if the files are not calling properly, or not the right files for the version, things like this would occur and I have no way to specify these as issues as things are happening in a totally unpredictable fashion.

                                            Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG! Get in contact with me (chat bubble in the top right corner) if you want to join in.

                                            Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                            Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

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