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Page with contact information for mobile devices
Fun and private pages
The page of LOVE
Photos of the monastery Eberbach and the Rhine riverside
Rhine District pictures
Wiesbaden pictures
Undescribable healing energy in Mother Teresas house
Linux Notepad
Clean restart of NDO and Nagios
Nagios video tutorials
Desktop videos with sound
Sorting according to status in Nagios 3.2.1
OCP daemon increases Nagios performance in distributed setups
Operations on Nagios host groups
Nagios 3 with failover on SLES 11 with NConf, NRPE, NSCA, PNP4Nagios and NagVis
RPM packages for NRPE
Import single database from MySQL dump
Channel bonding on SLES 10
The Weathermap Plugin of Cacti
The Discovery Plugin of Cacti
Investigation of hacked Linux Servers
Cacti Tips
snmpd binds to 127.0.0.1 only
Examples of SNMP requests
Delete a Gnome session
Change the language in Gnome
My favorite Linux books
Examples of common SELinux commands
How to make SELinux log to a seperate file
Tell SELinux to NOT log only once in permissive mode
SELinux newrole Couldn't get default type
Print the whole command line of processes with ps
How to run two independent MySQL daemons on the same server
How to burn a DVD image with growisofs and verify it
How to run two instances of sshd on Debian
mdadm error No mail address or alert command - not monitoring
How to find processes associated with open ports
How to search in the bash history
Configure Postfix as a relay client
Nagios notification commands and Postfix sendmail
NaNs in Cacti/Spine
Bash scripts for text file manipulations
PHP scripts and HTTP error 500
vBulletin installation with UTF-8
Full backup of web servers with MySQL databases
Linux Server Hardening
Nagios 3 installation tutorial for Gentoo
How to test SNORT
Use dhcpcd on the shell to retrieve an IP address via DHCP
Block SSH login attempts with denyhosts
Replace SSH login with public key authentication
How to send a message to other logged in users
How to paste text into VIM with correct text indention
How to set up a Postfix mail server with MySQL backend on Gentoo
A compromised web server from the hackers point of view
More security for Apache web servers with mod_security
Some tips to find out if a web server was hacked
Where do answers and solutions come from?
Secure settings for PHP web applications in php.ini
Get a nice directory overview in the shell with tree
Display and set Linux kernel parameters with sysctl
The if statement in bash scripts and as a oneliner
Simple load testing of the Apache2 webserver with ab2
Create large files with random content
How to disable a Linux user account
Setting up a load balancing cluster with director failover based on Keepalived, LVS and Gentoo
Process examination with strace
Detecting all hosts in a network which are online
Merging text files with a simple Perl script
Gentoo Port for the nagios-plugins package modified for vservers
Simple example to collect system activity information with sysstat
How to create IP aliases on Linux
rdate is a simple way to synchronize a hosts system time
Gentoo configuration management with Cfengine and Subversion
Rotating log files which are being held by an open file descriptor
The monitoring server tutorial with Nagios 2.8, NRPE 2.7.1 and Fruity
How to change the scheduling priority of CGIs
Web frontend for Apache .htaccess files
How to rewrite the sender address in Postfix
Measure the execution time of commands
Retrieve DNS information with dig
A simple web user agent in Perl
Control permissions of new files and directories with umask
Whitelist patch for qmail ra-plugin rblchecks
How to find out the current shell type
If a root-server cannot boot the rescue system anymore
Configure syslog-ng to store firewall logs in a separate log file
How to redirect stdin, stdout, stderr and use simple interprocess communication
Creating .htpasswd and .htaccess files from the command line
For loops as one-liners and within shell scripts
Example telnet ESMTP session with SMTP AUTH
How to configure grub for several linux installations on one hard drive
Create a nice greeting for the ssh login
Parallel execution of shell commands on several servers with DSH
How to change root within a shell script with chroot
Getting lots of information about files and file systems with stat
Gentoo tips and tricks
How to use fdisk within a shell script
The internal field separator IFS
Turning off the tab-completion bell
The command split
The command cut
The command hdparm
Burn CDs and DVDs from the command line
The command tr
Encrypting and decrypting files with GnuPG
Running MySQL queries from a shell script or from the command line
Perl example to get the calendar week
Use Whoisonline to analyse your web server traffic
Use Getmails to extract email addresses from Postcard Direct log files and other text files
Use Allrights to backup and restore file permissions suid sgid sticky bits owners and groups
Check scripts written in Perl for the Nagios plug-in NRPE
How to find the name of the linux distribution
How to handle unusual file or directory names
Basic commands and tips for the text editor Vim
Use screen to return to a session on a remote server even if the connection has been closed
How to change the file permissions with chmod and chown
Use basename to get the filename from a path
Mysql commands
The command cal
The command date
The command awk
The command sed
The command tar
The command find
The command grep
The command cp
The command nl
The command procinfo
The command mysqldump
The command pkill
The command pgrep
The commands kill and jobs
The command fuser
The command pstree
The command pidof
The command top
The command replace
The command chkconfig
The command xinetd
The command ifconfig
How to create cronjobs
The command du
The command df
The command diff
The command scp
The command ssh
The command whereis
The command watch
The commands mount and unmount
The command cancel
The command lpstat
The command lp
The command wc
The command touch
The command rm
Environment variables
The command exit
The command chroot
The command uname
The command runlevel
The command su
The command finger
The command whoami
Show logins with the command last
The command w
The command passwd
The commands clear and reset
The command hostname
How to validate a Google Sitemap
The command iptables
The command file
The commands unset and set
The commands modprobe and lsmod
The command recode
The command tail
The command head
The command pwd
The command pmap
The command wget
The command ls
The commands man and info