Well today I face another problem. I use Oracle VM VirtualBox Manager, and because of time consume to install a linux from dvd, I search and download a image from internet.

Well everything was good until I boot up and try to write something on that virtual machine. The keyword was mess up.

I search a little on internet and a lot of people sugested to use  system-config-keyboard however I don’t have any GUI installed, and I wanted to make it work from command line.

Well finally I found that you may fix this by using

loadkeys us

After using this you will see tha path to configuration file, on my server are located  ”/lib/kbd/keymaps/i386/” . There you may find what you need and after that just run loadkeys and the name of the file without map.gz

Well , today I was trying to install DataStax OpsCenter on a Centos 5.4 ( 5.x ) . After download and configured when to start I see a error. Well this was because on that version the python on that server is 2.4  more exaclty python-2.4.3-44.el5_7.1 .

How to upgrade centos 5.x with python 2.6 ? Well the solution is to yum install python26.

Will install another package and the DataStax OpsCenter will start working.

Well another problem.

One friend call me  that his server can’t send / receive e-mails. After I got ssh logins I see with mailq that where more then 20000 e-mail on queue.

Well I decided to remove all e-mail from queue  but how to do this.

Well the magic command is :

postsuper -d ALL

this will erase all e-mail from mailq queue

If you want to remove just one e-mail id run

postsuper -d mailID

Hope will help someone.

In the post http://matrafox.info/firephp-on-nginx-zend_db_profiler_firebug-bad-gateway.html  i modiy

fastcgi_buffer_size 16k;
fastcgi_buffers 4 16k;

However after a few day I nottice that on firefox I have a lot of 502  bad gateway .  So after a short look on log I see

*62814 upstream sent too big header while reading response header from upstream

So, to fix this I increase the valuse to

fastcgi_buffers 8 16k;
fastcgi_buffer_size 32k;

I see also that they can be even higher  something like

fastcgi_buffers 4 256k;
fastcgi_buffer_size 128k;

Recently I have a huge problem. Some site stop working after a cpanel update ( we think ) .
Email client start to be slow, mysql give mysql server has gone away, some curl give us error.
After a few hour of research we find out that gethostbyaddr was the php function that kill the apps.
When we check our resolv.conf we see that one of the dns was working verry slow.
We exclude that, add google nameserver and everything was back to normal.
Also please check to not have your own server listed there.

Regards