R71 IT Blog

The reason why I wanted to change the sizes of the partitions of one of my linux systems was the lack of space on the root partition. I'm running this linux system as a Virtual Machine (VM) using 256MB of RAM. I could have choosen to enlarge the vmdk file (the virtual disk), but I…

I’m giving Nagios a try, a very interesting Network Monitor system. It’s pretty cool stuff, but you have to take the time to get to know it. The setup and especially the configuration can get complicated. The Nagios community is pretty lively and there are a lot of plugins you can download and use. The…

For a snmp server I used a vmware virtual appliance: cacti.The clients I configured up till now are Fedora Core 6 environments. Windows will be added later on.

Files with the extension .tar.bz2 are compressed tarballs, a common way of sharing files on the internet. The compression rate is higher then that of a *.tar.gz or *.tgz file. Unpackig demands more CPU though. You can extract files from a tarball using the ‘tar’ command, this will creat a new folder containing the files…

File systems are part of our everyday lives. We store and retrieve data constantly, but rarely do we think think about how each file system works. Perhaps that’s as it should be: Linux supports many different kinds of file systems, and most are mature and robust. For example, the Linux kernel supports the traditional Ext2…

The file system is one of the most important parts of an operating system. The file system stores and manages user data on disk drives, and ensures that what's read from storage is identical to what was originally written. In addition to storing user data in files, the file system also creates and manages information…

In the Linux world, package management systems such as the RPM Package Manager (RPM) and Debian packages have become standard features with most distributions. Package management systems enable easy installs, de-installs, upgrades, and verification of both simple and complex software packages. The basic tools for both RPM and Debian packages, though, work on individual package…

This is boring stuff, but needed to build and maintain your ldap directory.

Here I got this script for you that can help you to secure your server from attackers or bots.Just add ip addresses you want to block to a file, on each line one, and run the script. Iptables will do the rest.

Using LDAP now… and no,  it is not a drug.  I started to set up LDAP on my home network to get a better understanding of this service. I'm getting there but it takes time.Using: Fedora 6, openldap. And the Thunderbird email client to look up my email addresses.

Needed: Computer (Virtual is an option) 2 NIC's ADSL modem linux and iptables

Adding some hints here to secure your mailserver. The list will grow in time.  $ vi /etc/mail/access # Description showing bellow for the format of this file comes from # the Sendmail source distribution under “cf/README” file. # # The table itself uses e-mail addresses, domain names, and network # numbers as keys. For example,…