How to use the loop device on Unix?
January 22, 2012
· admin
Ubuntu 11.10
Unix
Ubuntu 11.04
The loop device on Unix lets access a file as a block device. Disks are block devices. So, it is possible to use a file as a disk. The first step, create a file that will be used as a disk.
How to control the brightness of the display from command line?
January 17, 2012
· admin
Ubuntu 11.10
Ubuntu 11.04
You can set the brightness of the display by issuing this command within a shell
How to restore the normal scroll bars in Ubuntu 11?
January 11, 2012
· admin
Ubuntu 11.10
Ubuntu 11.04
Eclipse
Simply create a file named /etc/X11/Xsession.d/80overlayscrollbars and put into it the following line:
Install Ice Cream Sandwich on a Google Nexus S
December 5, 2011
· admin
Android
I have installed Ice Cream Sandwich (ICS) on a Google Nexus S. It works perfectly. The process is not complicated but requires some basic technical skills.
What's interesting about the process is that it is reversible. Nevertheless, I did not tried it.
I have installed ICS on a GT-9020A without any trouble using Ubuntu 11.10. You will find below an overview of the process. As usual, YOU DO IT AT YOUR OWN RISKS. BEFORE PROCEEDING, BACKUP ALL YOUR DATA, YOU PHONE IS ERASED DURING INSTALLATION.
Converting a certificate from DER to PEM or PEM to DER
December 3, 2011
· admin
openssl
Certificate
`
openssl x509 –in input.pem –inform PEM -out output.der –outform DER
openssl x509 –in input.der –inform DER -out output.pem –outform PEM
`
How to remove the passphrase on a private key
November 23, 2011
· admin
openssl
To remove a passphrase on a private key, simple execute this command.
Creating a certificate for a server
November 22, 2011
· admin
openssl
Certificate
Creating a server certificate involves only a few steps. To do so, execute the following commands. This post assumes that "OpenSSL initial configuration" and "Creating a ca's self signed certificate" has been done previously.
Create a private key for the server. This can be accomplished using any user. The secret key, server.key, must be well protected.
Creating a ca's self signed certificate
November 20, 2011
· admin
openssl
Certificate
In order to create your own certificates, you need a CA (certificate authority) certificate. This certificate will be used to sign every certificate you will create. To do so, execute the following command. This post assumes that "OpenSSL initial configuration" has been done previously.
Tomcat and MySQL benchmarks
November 18, 2011
· admin
Tomcat
MySQL
Benkmarks made using a Tomcat and a MySQL database. These figures are provided to give you an idea of the performance you should expect.
The tests were done in the following conditions:
OpenSSL initial configuration
November 17, 2011
· admin
openssl
This initial configuration procedure assumes that you are executing it on Linux