Problem: for some applications a mouse coursor in disturbing. E.g. video players, signage display. Solution: the tool unclutter hides the mouse coursor after a chosen idle timeout. Unclutter is part of the main debian repository. Version: Debian 7.1
Hide Mouse Coursor on X11/Xorg Read More »
Problem: I got the following error message in the the freshclam.log file on several servers with clamav installed. ERROR: getpatch: Can’t download daily-16682.cdiff from database.clamav.net Due to this bug the virus database wasn’t updated for days! It seams to be a bug in clamav with dialy-16682.cdiff (dialy.cvd increment)Normally that would be solve automatically by downloading
Clamav/Freshclam update fails! Read More »
Problem: You want to check the hardware health status on you debian server running on an HP ProLiant hardware. After spending some time on the HP.com homepage, I got really angry. HP does a really bad job on their support homepage. If you search for DL360 G5 you see a list of operating systems. The
Linux on HP servers Read More »
Problem: You want to know which switch and what port your Linux machine is connected to? Solution: If the switch does CDP (all Cisco switches do), it tells you a lot of information. Tcpdump can capture and show this information. # tcpdump -i eth0 -n -v -s 1500 -c 1 ‘ether[20:2] == 8192’ tcpdump: listening
Problem: After updating from debian lenny (5) to squeeze (6) ejabberd authentication (PAM) stopped working. Solution: ejabberd uses an external programm called epam to authenticate. But this programm had no permission to use pam. I had to type these commands: chown root.ejabberd /usr/lib/ejabberd/priv/bin/epam chmod 4750 /usr/lib/ejabberd/priv/bin/epam killall epam ejabberd 2.1.5-3+squeeze1
ejabberd on debian with pam Read More »
When you have a mysql table with lot’s of attributes, it’s hard to read the output of a statement like this in mysql: select * from table limit 1; The data is folded very ugly. Easy Solution: select * from table limit 1 \G Mysql is showing one “Fieldname: Value” per line.
Mysql “Select” Output Turned Arround Read More »
Problem: If you want to add water marks onto a pdf document, you have to merge two pdf files into one pdf file. Solution: On Linux there is a tool called pdftk (PDF Toolkit), which can do this. pdftk <letter.pdf> background <background.pdf> output <letter-with-background.pdf>
Howto: Merge two PDF Files onto One Page Read More »
I don’t burn CDs often, but when I do I still look for “cdrecord”, which doesn’t exist on debian anymore. Debian forked the source and renamed it to wodim, because of a license dispute between the Debian maintainers and cdrtools author Jörg Schilling.
cdrecord is called wodim now Read More »
If you like to restrict access to a directory on your Apache web server to users from a fixed IP range without password, and the rest of the world with password authentication the httpd.conf section can look like this for Apache-2.2: For apache-2.4 the syntax has changed to:
Apache Authentication by IP and Password at the Same Time Read More »
Challenge: You have a linux based firewall, which should forward all internal and external traffic of its connected clients through a VPN tunnel, and at the same time the traffic from the firewall itself should not go through the tunnel (e.g. the tunnel connection packets). Solution: There are lots of howtos for this probably. Here
Multiple Routing Tables with IPTables Read More »