http://www.randombugs.com Just another Bastard Operator From Hell. Everything from *nix to programming Thu, 05 Jan 2012 11:44:55 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 http://www.randombugs.com/linux/gpg-ubuntu-debian.html http://www.randombugs.com/linux/gpg-ubuntu-debian.html#comments Wed, 13 May 2009 12:40:28 +0000 admin http://www.randombugs.com/?p=443
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. GnuPG encrypts messages using ...]]> http://www.randombugs.com/linux/gpg-ubuntu-debian.html/feed 3 http://www.randombugs.com/linux/encrypting-decrypting-files-ubuntu.html http://www.randombugs.com/linux/encrypting-decrypting-files-ubuntu.html#comments Tue, 05 May 2009 12:27:27 +0000 admin http://www.randombugs.com/?p=434
This days we shouldn’t trust in anything. The Internet is full of worms, trojans, viruses and they are spreading more and more. Even if you have a firewall is not enough. The best security for your computer is to have it unplugged from power and network … and even then you cannot be 100% about security of your stored data. So today we will talk about encryption under Linux. I will show you how to do it from console and from KDE Windows manager. We have several possibilities to encrypt ...]]> http://www.randombugs.com/linux/encrypting-decrypting-files-ubuntu.html/feed 2 http://www.randombugs.com/linux/linux-isc-dhcp-server-dynamic-dns-updates-debian-ubuntu.html http://www.randombugs.com/linux/linux-isc-dhcp-server-dynamic-dns-updates-debian-ubuntu.html#comments Wed, 08 Apr 2009 12:38:08 +0000 admin http://www.randombugs.com/?p=395
This article will cover the DNS dynamic updates and DHCP DNS updates. I assume you already followed my last 2 articles “Linux ISC DHCP Server under Debian and Ubuntu” and “Linux ISC DHCP Server failover under Debian and Ubuntu” and I assume you have minimum skills in configuring ISC BIND dns server. Why Dynamic DNS with DHCP ? Beacuse is hard to remeber IP’s for all type of devices. Managing a Dynamic DNS is more simple than learn everytime new ip’s from your network. Also this configuration in big networks ...]]> http://www.randombugs.com/linux/linux-isc-dhcp-server-dynamic-dns-updates-debian-ubuntu.html/feed 2 http://www.randombugs.com/linux/linux-isc-dhcp-server-failover-debian-ubuntu.html http://www.randombugs.com/linux/linux-isc-dhcp-server-failover-debian-ubuntu.html#comments Tue, 07 Apr 2009 12:32:50 +0000 admin http://www.randombugs.com/?p=386
We discussed in our early article “Linux ISC DHCP Server under Debian and Ubuntu” how to configure a plain standard ISC DHCP server. In today article we will discuss about ISC DHCP failover. In small networks haveing 1 single DHCP server is a common thing, but in a medium or large computer network 1 single DHCP server is a single point of failure. When the DHCP server goes offline your workstation, or any other network device, lose their network connectivity and this can transform in a big problem for your ...]]> http://www.randombugs.com/linux/linux-isc-dhcp-server-failover-debian-ubuntu.html/feed 2 http://www.randombugs.com/linux/linux-isc-dhcp-server-debian-ubuntu.html http://www.randombugs.com/linux/linux-isc-dhcp-server-debian-ubuntu.html#comments Mon, 06 Apr 2009 11:22:45 +0000 admin http://www.randombugs.com/?p=374
Managing big networks can become an issue if you don’t use the right tools. DHCP (Dynamic Host Configuration Protocol) appears in early 1993 and was defined in RFC 1531. This protocol was created to reduce system administration workload, allowing administrators to add new devices in a IPV4 network easy as possible (in some cases no intervention required). Dynamic Host Configuration Protocol is used by DHCP clients to automatically obtain the necessaryly information (network parameters assigment) to connect to a IPV4 network. Also DHCP was extended for IPV6 protocol in ...]]> http://www.randombugs.com/linux/linux-isc-dhcp-server-debian-ubuntu.html/feed 1 http://www.randombugs.com/linux/migrating-ext3-ext4.html http://www.randombugs.com/linux/migrating-ext3-ext4.html#comments Tue, 24 Mar 2009 07:53:49 +0000 admin http://www.randombugs.com/?p=347
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. The first stable version of ext4 is already out and probably a lot of you want to test it a little bit, so I write ...]]> http://www.randombugs.com/linux/migrating-ext3-ext4.html/feed 0 http://www.randombugs.com/linux/shell-error-handling.html http://www.randombugs.com/linux/shell-error-handling.html#comments Mon, 23 Mar 2009 13:51:24 +0000 admin http://www.randombugs.com/?p=335
Today we will talk about shell error handling. Almost weekly I’m writing new shell scripts for me or my customers and in this time I learned something very valuable: writing scripts without error handling is like running windows, expect at unexpected. Let’s take the following example: #!/bin/sh   CHROOT=$1 [ ... snip code ... ]   rm -rf $CHROOT/ Oops … This is the most bad thing what can happen, but is a very real and possible thing. Errors can be handle in various ways, but in this article I will present you my methods to deal ...]]> http://www.randombugs.com/linux/shell-error-handling.html/feed 0 http://www.randombugs.com/linux/howto-work-ssh-keys-agents-usefull-stuff.html http://www.randombugs.com/linux/howto-work-ssh-keys-agents-usefull-stuff.html#comments Tue, 17 Mar 2009 13:54:45 +0000 admin http://www.randombugs.com/?p=314
Managing more than 80 Linux servers is not an easy job, but with the help of ssh I can distribute a command to all servers without typing, retyping the password every time for that. Don’t understand me wrong, you will need to type a password for accessing this servers, but just one time. If you manage correctly your keys you will don’t need to have any fear in heavy exploiting the ssh keys. What is SSH ? SSH stands for Secure Shell and is a protocol that allows secure data exchange ...]]> http://www.randombugs.com/linux/howto-work-ssh-keys-agents-usefull-stuff.html/feed 0 http://www.randombugs.com/linux/howto-extend-lvm-partition-online.html http://www.randombugs.com/linux/howto-extend-lvm-partition-online.html#comments Tue, 10 Mar 2009 13:22:51 +0000 admin http://www.randombugs.com/?p=253
Working with virtual machines is a pain if you don’t start to plan, from begining, all resources of your real machine. So for my virtual machines I always create a standard LVM partition for root (/) and from begging I allocate only necessary space for my machine (because linux kernel can’t boot from a LVM partition you will be forced to create the /boot partition as normal one and not as LVM partition). After that, if I want, to resize my LVM partition I can do it ONLINE (with / ...]]> http://www.randombugs.com/linux/howto-extend-lvm-partition-online.html/feed 20 http://www.randombugs.com/hacker/chkrootkit-debian-ubuntu.html http://www.randombugs.com/hacker/chkrootkit-debian-ubuntu.html#comments Mon, 09 Mar 2009 13:32:09 +0000 admin http://www.randombugs.com/?p=244
When we auditing a Linux system we have a lot of good tools to monitor unexpected changes and unexpected behaviour of a system. Earlier we talked about rkhunter as a system check for rootkits and now, as an alternative, we will talk about chkrootkit (Determine whether the system is infected with a rootkit). If you want to know a definition of what is a rootkit please read the first article about rkhunter. chkrootkit is a freesoftware what is work with Linux, FreeBSD, OpenBSD, NetBSD, Solaris, HP-UX 11, Tru64, BSDI and Mac ...]]> http://www.randombugs.com/hacker/chkrootkit-debian-ubuntu.html/feed 0