Wednesday, September 10, 2008

How to solve no sound in flash videos ( fedora )

After installing flash-plugin- rpm I just got the flash plugin in my firefox but didn't get any sound. Googling about it I found a solution that worked, you need to install libflashsupport rpm, restart firefox and that's it:

just type this:

yum install libflashsupport

I guess this may work in other red hat based distros.

Monday, September 08, 2008

PHP Fatal error: Class 'DomDocument' not found in ...

After running symfony propel-build-all on a new symfony installation got this error. The solution is to install the php-xml rpm (deb).

[root@devel2 cms]# symfony propel-build-all
>> schema converting "/home/sfprojects/cm...lugin/config/schema.yml" to XML
>> schema putting /home/sfprojects/cms/pl...erated-sfGuardPlugin-schema.xml
>> file+ config/generated-sfGuardPlugin-schema.xml
>> file- /home/sfprojects/cms/plugins/sf...erated-sfGuardPlugin-schema.xml
Buildfile: /usr/share/pear/symfony/vendor/propel-generator/build.xml
[resolvepath] Resolved /home/sfprojects/cms/config to /home/sfprojects/cms/config

propel-project-builder > check-project-or-dir-set:

propel-project-builder > check-project-set:

propel-project-builder > set-project-dir:

propel-project-builder > check-buildprops-exists:

propel-project-builder > check-buildprops-for-propel-gen:

propel-project-builder > check-buildprops:

propel-project-builder > configure:
[echo] Loading project-specific props from /home/sfprojects/cms/config/propel.ini
[property] Loading /home/sfprojects/cms/config/propel.ini

propel-project-builder > om:
[phing] Calling Buildfile '/usr/share/pear/symfony/vendor/propel-generator/build-propel.xml' with target 'om'
[property] Loading /usr/share/pear/symfony/vendor/propel-generator/./

propel > check-run-only-on-schema-change:

propel > om-check:

propel > om:
[echo] +------------------------------------------+
[echo] | |
[echo] | Generating Peer-based Object Model for |
[echo] | YOUR Propel project! (NEW OM BUILDERS)! |
[echo] | |
[echo] +------------------------------------------+
[phingcall] Calling Buildfile '/usr/share/pear/symfony/vendor/propel-generator/build-propel.xml' with target 'om-template'
[property] Loading /usr/share/pear/symfony/vendor/propel-generator/./

propel > om-template:
[propel-om] Target database type: mysql
[propel-om] Target package: lib.model
[propel-om] Using template path: /usr/share/pear/symfony/vendor/propel-generator/templates
[propel-om] Output directory: /home/sfprojects/cms
[propel-om] Processing: schema.xml
PHP Fatal error: Class 'DomDocument' not found in /usr/share/pear/symfony/vendor/propel-generator/classes/propel/phing/AbstractPropelDataModelTask.php on line 406

Saturday, June 21, 2008

Mplayer crashes using beryl compiz-fusion

When you start to use compiz-fusion and all the fancy desktop effects you will notice a little problem, you can't watch videos!. There's a bug that crashes mplayer, totem and all your video players. Hopefully there's a workaround for mplayer (not sure how to solve the problem with totem).

1. Open mplayer.
2. Right click over the window.
3. Click on preferences.
4. Click on the Video tab .
5. Change the video driver from Xv to X11 and click Ok.

You may have to restart mplayer to see the changes.

Wednesday, June 18, 2008

Vista Blue Screen of Death: STOP: 0x0000008E

The famous blue screen of death attacked me again (previous bsod), this time on Vista, on my Dell inspiron 1520. It's very annoying that you have to deal with this kind of errors on a laptop recently bought. This error started to display a few seconds after logging in to the user account and with no clear reason of what could be the trigger of the error.

The solution this time actually had nothing to do (directly) with Windows Vista but with the laptop BIOS, and the solution came from the dell support site, the error itself suggested to update the BIOS , but I don't pay too much attention to this general error messages. If you're having this same problem you could go and follow this check list from dell, the BIOS upgrade was the second suggestion for a BSOF error and this was the one that worked for me, the file to do this is in the "Drivers and Downloads" section and you can select between all the different models.

Subversion: MKCOL of '...' 405 Method Not Allowed

I was messing with the .svn/entries file in one of my local working copy folders, also I rm -rf a folder and regenerated again (I'm using symfony admin generator) , long story, but the fact is that I think I screwed up something and started to get this error when trying to commit:

# svn commit -m "backend modifications"
Adding apps/backend/modules/comment
svn: Commit failed (details follow):
svn: MKCOL of '/projects/cms/!svn/wrk/5ca09002-f34f-0410-890e-9511925f86a5/trunk/apps/backend/modules/comment': 405 Method Not Allowed (

After some googling, I found it could be some proxy problem, but I wasn't using a proxy. Later I found that this error could mean that
the directory already existed in the repository and couldn't be recreated again, so my next step was to delete the folder from the repository (svn del ...) and try to do a fresh commit after recreating the folder and files included in it, and this worked ;).

I hope this helps some lost soul out there.

Thursday, May 22, 2008

Unable to write config cache for "config/config_handlers.yml"

After upgrading to symfony version 1.0.16 from 1.0.8 I started to get this error:

Unable to write config cache for "config/config_handlers.yml"

I tried to chmod 777 the cache and it didn't work. The solution for me was to disable SELinux.

How to do that? edit your /etc/sysconfig/selinux file, and set SELINUX=disabled:

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcinfg - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.

Thursday, February 21, 2008

Page redirection in php with header('Location...') : Blank page vs Working redirection

This kind of errors are what make debugging sometimes a very frustrating part of the developement, if you're suffering a blank page when trying to make a header('Location..'), give this a try:

This is a good redirection:


And this is a wrong redirection:

header('Location :');

Notice a space between 'Location' and ':' this makes the redirection not to work!!!!

Simple errors likes this consume a lot of time :( , hope helps someone else...

Monday, February 11, 2008

.htaccess: order not allowed here

I was getting an 500 Internal Server Error when trying to access Drupal after installing it, when I checked the http error log it said : .htaccess: order not allowed here.

After adding this to the httpd.conf and restarted apache it worked:

< directory "/home/httpd/html/drupal" >
AllowOverride FileInfo Limit Options Indexes
< /directory >

change "/home/httpd/html/drupal" to wherever your document root is.

Friday, February 08, 2008

Apache Error: No space left on device

Apache doesn't start and the error log contains:

[emerg] (28)No space left on device: Couldn't create accept lock
[crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed

After checking your disk it shows that you have plenty of space. The problem is that apache didn't shut down properly, and it's left myriads of semaphore-arrays left, owned by 'apache' user.


ipcs -s | grep apache

Removing these semaphores immediately should solve the problem and allow apache to start.

ipcs -s | grep apache | perl -e 'while () { @a=split(/\s+/); print `ipcrm sem $a[1]`}'

where 'apache' is the owner of the apache process, if that's not the name of the user on your server change it.

How to check running queries and stats in postgres ?

You want to know what query is slowing the database or want to check what's going on with a query you
just run, well in mysql just need to type 'show processlist;', but in postgres you must enable two variables
to check this and other stats.

Edit your postgres.conf which should be on /var/lib/pgsql/data/postgresql.conf for *nix installations and add or change this:

stats_start_collector = true

This must be set to true for the statistics collector to be launched at all.

stats_command_string = true

This enables monitoring of the current command being executed by any server process. The statistics collector subprocess need not be running to enable this feature.

After restarting postgres the following query will show currently running queries

/etc/init.d/postgresql restart

psql -U postgres template1 -c "select * from pg_stat_activity"

only as user "postgres"