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Debian, Featured, Linux, Newbie, Shell »

[16 Mar 2010 | 2 Comments | ]

After an Amavis upgraded my e-mail system started to have a strange behavior. A lot of emails sent internally from one user to another stopped with the following message:

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Apache, Debian, Featured, How-to, Newbie, Tuning »

[22 Jun 2009 | 3 Comments | ]

Limiting abusers from running 20 download threads from the same Apache server is easy now with mod_limitipconn. But the apache 2 module, mod_limitipconn, is not available under the latest Debian distribution, Lenny. In this mini how-to I will show you how-to manage this module to work for Debian Lenny users. The compile process of mod_limitipconn is a little bit more than “make install”.
First install apache prefork development utilities (we need apxs2 to compile our module)

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Clustering, Glassfish, How-to, Java, Newbie »

[28 May 2009 | One Comment | ]

Why you should do that? All this ports, by default, are allocated dynamically and if you want to use a firewall between your client and JMS broker then you should have static ports assigned. Another solution is to tunnel through httpjms and httpsjms protocol but this are slow. In the next article I will show you how to assign static ports to this JMS service in Glassfish. To show you the all ports what need for JMS I just “ripped” the following table from SUN Site: http://docs.sun.com/app/docs/doc/820-4916/gcuhq?a=view

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Cryptography, Debian, Featured, Headline, How-to, Linux, Newbie, Recovery, Security, Shell, Tuning, Ubuntu »

[13 May 2009 | 3 Comments | ]

Gpg is stands for Gnu Privacy Guard and is a free alternative to the PGP cryptographic software. GnuPG (or GPG) follows the RFC 4880 which is the standard specification of OpenPGP. The most important thing GPG is interoperable with PGP. GPG is build as a command line utility but also have several front-ends for KDE, Gnome and other Linux desktops, but also is directly integrated in other software like: Email Clients as Mozilla Thunderbird, Evolution, Kmail, Instant Messaging as PSI, Fire, Browsers as Mozilla Firefox etc.

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Debian, Featured, How-to, Linux, Newbie, Tuning, Ubuntu »

[24 Mar 2009 | No Comment | ]

Ext4 is the normal evolution of the most used Linux filesystem: Ext3. The evolution of Ext3 from Ext2 had add just 1 new important feature: journalization. But ext4 is a result of hardly improved Ext3 and is coming with better performance, modified data structures, reliability and new features like bigger filesystem/file sizes, subdirectory scalability, extents, multiblock allocation, delayed allocation, journal checksumming, online defragmentation, persistent preallocation.

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