Fix “VBoxManage: error: Cannot register the hard disk … because a hard disk … already exists”

If you get an error like this when running a vboxmanage command:

VBoxManage: error: Cannot register the hard disk 'disk.vdi'…

Load testing a web site with Siege

Siege is an HTTP load testing and benchmarking utility. It helps you test you server and web developments in high load situations. Quoted from it’s home page:

Siege is an http load testing and benchmarking utility. It was designed to let web…

Fix “No such file or directory: httpd: could not open error log file /…/${APACHE_LOG_DIR}/site.log”

If you get an error like this in the Apache2 error log:

No such file or directory: httpd: could not open error log file…

Disable blank console in Ubuntu

This behaviour is used as a screensaver for the terminal.

To disable it Edit /etc/default/grub and add consoleblank=0 in the GRUB_CMDLINE_LINUX_DEFAULT option:

GRUB_CMDLINE_LINUX_DEFAULT="consoleblank=0"

“Uncaught exception ‘ErrorException’ with message ‘proc_open(): fork failed” with composer

I got this error while updating with composer:

PHP Fatal error:  Uncaught exception 'ErrorException' with message 'proc_open(): fork failed - Cannot…

View MySQL server information

With the server up and running:

$ mysqladmin variables -u root -p
Enter password:
+----------------------------+----------------------------+
| Variable_name              | Value                      |…