CENTOS7 – vnc server remote desktop setup howto screen sharing in 2018

it is wise to, monitor all logs while you are trying to get vnc server working… it can reveal a lot what is going on and wrong. forget about Xvnc and tigervnc… x11vnc is probably what you want: https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-vnc-remote-access-for-the-gnome-desktop-on-centos-7 it […]


somtimes it is easier to land on the moon… than install a printer… [root@centos user]# hostnamectl Static hostname: centos.template Icon name: computer-desktop Chassis: desktop Operating System: CentOS Linux 7 (Core) CPE OS Name: cpe:/o:centos:centos:7 Kernel: Linux 4.15.1 Architecture: x86-64 Epson_Stylus_SX510W […]

Windows Batch CMD scripts – why endless loop?

sometimes the scripts that used to work perfectly well – suddenly start to miss behave – but you HAVE NOT altered them! look closely to the directory they reside in… maybe something in the dir has changed! make sure: your […]


… i never regret the learning curve of going Open Source. its not easier – but way more solid. order yourself a try without install boot stick today: http://linux-workshops.de/ideal-linux-stick/ if it does not boot – money back!

CentOS7 setup virtualbox

1. http://dwaves.de/2017/06/30/centos-redhat-compiling-the-latest-kernel/ su; # become root mkdir /software; cd /software; wget https://download.virtualbox.org/virtualbox/5.2.6/VirtualBox-5.2-5.2.6_120293_el7-1.x86_64.rpm rpm -i VirtualBox-5.2-5.2.6_120293_el7-1.x86_64.rpm; # install # that easy in order to use anything faster than USB 1.1 you will need to install the extension pack. wget https://download.virtualbox.org/virtualbox/5.2.6/Oracle_VM_VirtualBox_Extension_Pack-5.2.6-120293.vbox-extpack go […]


docker exec -it -u postgres example-db psql; # login interactively SELECT * FROM pg_stat_activity WHERE datname = ‚example‘; # check open connections to database example # (there shall be none, otherwise you can not drop the database) SELECT pg_terminate_backend (pg_stat_activity.pid) […]

CentOS7 install ntfs support

one partly cloudy day i was trying to copy things via usb stick… it would not work. i realized: i haven’t used NTFS for a while 😀 yum install ntfs-3g fuse replug the stick. you don’t even have to restart […]


REM delete all mapped network drives net use * /DELETE /Y REM map two drives net use W: „\\\SharedFolderA“ /persistent:yes /user:usernameA PaSsWorDA net use T: „\\\SharedFolderB“ /persistent:yes /user:usernameB PaSsWorDB what you need to know: windows CAN NOT establish two connects […]

LANCOM Erklärung zur Vertrauenswürdigkeit

Erklärung der LANCOM Systems GmbH Produkte von LANCOM sind frei von versteckten Zugangsmöglichkeiten und sonstigen unerwünschten Funktionen zur Ein- und Ausleitung oder Manipulation von Daten LANCOM Systems weiß um die Bedeutung vertrauenswürdiger Infrastrukturen für die erfolgreiche Digitalisierung von Wirtschaft und […]


The Dalai lama once said: „Thanks to the internet – lies do not work anymore.“ I can’t give you double sources for this quote. The context was: Nobody can do evil and then deny it. Because the SmartPhone footage uploaded […]


who is who? concepts: docker is written in Google Go by Docker Inc, SanFrancisco because it does not emulate any hardware – it is a linux container / sandbox or jail like Free BSD Jail or Solaris Zones. For example […]


yum install kbd; # is needed ll /lib/kbd/keymaps/xkb/ | grep de-; # find all available germany keymap layouts localectl list-keymaps; # alternatively loadkeys de; # load keyboard layout localectl set-keymap de; # permanently change keyboard layout


most people will probably use a usb cable to iphone<->PC/Laptop<->USB-Stick. But can it be done iphone<->USB-Stick? Apple’s devices do NOT come with a file explorer per default. which sucks. So you will have to rely on the quality of 3rd […]

linux bash bc – calculating with pi

bc is cool, but it can not access shell variables directly, but you can pass them with <<< also there is no „pi“ constant in bc that you could use in interactive mode. let one assume you would like to […]

gpg verify downloaded software – no public key

if you download software, you should verify that what you downloaded is not a altered file of a hacked server distributing trojan horses and keyloggers (malware). it seems for the gpg verification it is a 3 step process. 1. download […]


When you reserve a new domain – and the registrar asks you for your (personal?) mail to be published in the whois database. You better give it a mail address designated for spam. I just received a spam letter at […]

Bugs in Hardware – intel microcode updates

As Einstein allready knew energy = matter = energy. great comparison: bugs in hardware – only solution: change / update the hardware regularly or sue the producer. „A hastily developed and deployed patch which breaks other things is the last […]


It is not (yet) a major fall in price and NiceHash seems to be operational again – a website which offers Bitcoin in exchange for customers‘ computing power so it can mine other cryptocurrencies, confirmed that it had suffered a […]

Sidexis4 – 3d xray and kvm virtualization

as addressed here, kvm allows GPU pass through to VM. Basically making it possible to run Sidexis4 client on a linux host. when connecting via RDP (Microsoft Remote Desktop) Sidexis complains about the Graphic card being not suitable… but starts […]