Tag Archives: linux

Forcing kdesu / xdg-su to honour ‘sudoers’

Posted on November 9, 2018 by robert

kwriteconfig5 --file kdesurc --group super-user-command --key super-user-command sudo

1	kwriteconfig5 --file kdesurc --group super-user-command --key super-user-command sudo

You can also just add this to $HOME/.config/kdesurc

[super-user-command]
super-user-command=sudo

1 2	[super-user-command] super-user-command=sudo

Source from 2008 :-)

Posted in Computer / Server | Tagged kde, kdesu, Leap 15, linux, opensuse, sudo, xdg-su | Comments Off

VirtualBox mischief – getting rid of too many pesky users

Posted on November 4, 2018 by robert

This requires VirtualBox guest additions to be installed.

#!/bin/bash

VM_NAME="deb test"
MAX_USERS=2
RUNNING_VMS=`VBoxManage list runningvms`
OUR_VM_IS_RUNNING=`echo ${RUNNING_VMS} | grep "${VM_NAME}"`

if [[ -z ${OUR_VM_IS_RUNNING} ]]
then
        echo -e "VM \"${VM_NAME}\" not running...\nBye!"
        exit
fi

LOGGED_IN_USERS=`VBoxManage guestproperty enumerate "${VM_NAME}" | grep "/OS/LoggedInUsers, value" | awk '{split($4,a,","); print a[1]}'`

if [[ ${LOGGED_IN_USERS} -gt ${MAX_USERS} ]]
then
        echo "Checking VM: \"${VM_NAME}\"..."
        echo "${LOGGED_IN_USERS} logged in. Maximum allowed: ${MAX_USERS}"
        echo "Shutting down \"${VM_NAME}\" ..."
        VBoxManage controlvm "${VM_NAME}" savestate
else
        echo "Checking VM: \"${VM_NAME}\"..."
        echo "${LOGGED_IN_USERS} logged in. Maximum allowed: ${MAX_USERS}"
        echo "Phew ..."
fi

#!/bin/bash

VM_NAME="deb test"

MAX_USERS=2

RUNNING_VMS=`VBoxManage list runningvms`

OUR_VM_IS_RUNNING=`echo ${RUNNING_VMS} | grep "${VM_NAME}"`

if [[ -z ${OUR_VM_IS_RUNNING} ]]

then

echo -e "VM \"${VM_NAME}\" not running...\nBye!"

exit

LOGGED_IN_USERS=`VBoxManage guestproperty enumerate "${VM_NAME}" | grep "/OS/LoggedInUsers, value" | awk '{split($4,a,","); print a[1]}'`

if [[ ${LOGGED_IN_USERS} -gt ${MAX_USERS} ]]

then

echo "Checking VM: \"${VM_NAME}\"..."

echo "${LOGGED_IN_USERS} logged in. Maximum allowed: ${MAX_USERS}"

echo "Shutting down \"${VM_NAME}\" ..."

VBoxManage controlvm "${VM_NAME}" savestate

else

echo "Checking VM: \"${VM_NAME}\"..."

echo "${LOGGED_IN_USERS} logged in. Maximum allowed: ${MAX_USERS}"

echo "Phew ..."

Posted in Computer / Server | Tagged linux, mischief, scripting, VBoxManage, VirtualBox, virtualization | Comments Off

A bit of VirtualBox scripting – NAT & DHCP

Posted on November 3, 2018 by robert

Maybe someone will find it useful…

#!/bin/bash

ISO="${HOME}/VirtualBox VMs/__stuff__/ISOs/debian-9.5.0-amd64-netinst.iso"

VBoxManage createvm --name "$1" --register --ostype "Linux_64" 
VBoxManage modifyvm "$1" --memory 1024 --acpi on --cpus 2 --audio none --usbxhci on --ioapic on --vram 16 
VBoxManage storagectl "$1" --name "SATA" --add sata --hostiocache on --portcount 2
MEDIUM_UUID=`VBoxManage createmedium disk --filename "$HOME/VirtualBox VMs/$1/$1" --size 8000 --format VDI | awk '{print $4}'`
VBoxManage storageattach "$1" --storagectl "SATA" --port 0 --type hdd --medium ${MEDIUM_UUID} --nonrotational on 
VBoxManage storageattach "$1" --storagectl "SATA" --port 1 --type dvddrive --medium "${ISO}"
#VBoxManage storageattach "$1" --storagectl "SATA" --port 1 --type dvddrive --medium emptydrive


if [[ -z `VBoxManage list hostonlyifs` ]]
then
	VBoxManage hostonlyif create
fi

VBoxManage hostonlyif ipconfig vboxnet0 --ip 192.168.56.1 --netmask 255.255.255.0
VBoxManage dhcpserver add --ifname vboxnet0 --ip 192.168.56.3 --netmask 255.255.255.0 --lowerip 192.168.56.100 --upperip 192.168.56.200 --enable
VBoxManage modifyvm "$1" --nic1 hostonly
VBoxManage modifyvm "$1" --hostonlyadapter1 vboxnet0

VBoxManage natnetwork add --netname natnet1 --network "192.168.16.0/24" --enable
VBoxManage natnetwork modify --netname natnet1 --port-forward-4 "ssh:tcp:[127.0.0.1]:6666:[192.168.16.137]:22"
VBoxManage dhcpserver add --netname natnet1 --ip 192.168.16.3 --netmask 255.255.255.0 --lowerip 192.168.16.137 --upperip 192.168.16.200 --enable
VBoxManage modifyvm "$1" --nic3 natnetwork
VBoxManage modifyvm "$1" --nat-network3 natnet1

VBoxManage dhcpserver add --netname intnet0 --ip 192.168.42.3 --netmask 255.255.255.0 --lowerip 192.168.42.100 --upperip 192.168.42.200 --enable
VBoxManage modifyvm "$1" --nic2 intnet
VBoxManage modifyvm "$1" --intnet2 intnet0

VBoxManage list natnets
VBoxManage list hostonlyifs
VBoxManage list dhcpservers

#!/bin/bash

ISO="${HOME}/VirtualBox VMs/__stuff__/ISOs/debian-9.5.0-amd64-netinst.iso"

VBoxManage createvm --name "$1" --register --ostype "Linux_64"

VBoxManage modifyvm "$1" --memory 1024 --acpi on --cpus 2 --audio none --usbxhci on --ioapic on --vram 16

VBoxManage storagectl "$1" --name "SATA" --add sata --hostiocache on --portcount 2

MEDIUM_UUID=`VBoxManage createmedium disk --filename "$HOME/VirtualBox VMs/$1/$1" --size 8000 --format VDI | awk '{print $4}'`

VBoxManage storageattach "$1" --storagectl "SATA" --port 0 --type hdd --medium ${MEDIUM_UUID} --nonrotational on

VBoxManage storageattach "$1" --storagectl "SATA" --port 1 --type dvddrive --medium "${ISO}"

#VBoxManage storageattach "$1" --storagectl "SATA" --port 1 --type dvddrive --medium emptydrive

if [[ -z `VBoxManage list hostonlyifs` ]]

then

VBoxManage hostonlyif create

VBoxManage hostonlyif ipconfig vboxnet0 --ip 192.168.56.1 --netmask 255.255.255.0

VBoxManage dhcpserver add --ifname vboxnet0 --ip 192.168.56.3 --netmask 255.255.255.0 --lowerip 192.168.56.100 --upperip 192.168.56.200 --enable

VBoxManage modifyvm "$1" --nic1 hostonly

VBoxManage modifyvm "$1" --hostonlyadapter1 vboxnet0

VBoxManage natnetwork add --netname natnet1 --network "192.168.16.0/24" --enable

VBoxManage natnetwork modify --netname natnet1 --port-forward-4 "ssh:tcp:[127.0.0.1]:6666:[192.168.16.137]:22"

VBoxManage dhcpserver add --netname natnet1 --ip 192.168.16.3 --netmask 255.255.255.0 --lowerip 192.168.16.137 --upperip 192.168.16.200 --enable

VBoxManage modifyvm "$1" --nic3 natnetwork

VBoxManage modifyvm "$1" --nat-network3 natnet1

VBoxManage dhcpserver add --netname intnet0 --ip 192.168.42.3 --netmask 255.255.255.0 --lowerip 192.168.42.100 --upperip 192.168.42.200 --enable

VBoxManage modifyvm "$1" --nic2 intnet

VBoxManage modifyvm "$1" --intnet2 intnet0

VBoxManage list natnets

VBoxManage list hostonlyifs

VBoxManage list dhcpservers

Please note, as of today (2018-11-03) there appears to be an annoying issue with the DHCP server (5.2.20) for “NAT Network” (not just “NAT”). If you change the settings for the built-in DHCP … Continue reading →

Posted in Computer / Server | Tagged linux, scripting, VBoxManage, VirtualBox, virtualization | Comments Off

SuSE museum — 7.3 to 9.1

Posted on January 12, 2017 by robert

SuSE Linux Professional 7.3

Posted in Computer / Server | Tagged good old days, historical, linux, museum, SuSE | Comments Off

“Easy” remote-admin — take 2

Posted on September 8, 2015 by robert

In my previous post I described a method for a boot-activated remote-admin option for my parents’ computer. On 2nd thought, it is not always a good idea to rely on changing system-wide configurations (such as sshd_config, firewall…) In this post … Continue reading →

Posted in Computer / Server | Tagged admin, iptables, linux, port forwarding, remote, router, SSH, sshd, VNC | Comments Off

“Easy” & quite safe remote-admin for parent’s linux machine

Posted on September 7, 2015 by robert

Yes, I know about KDE desktop sharing, FreeNX and relatives… and again yes, this is nothing new, but someone might still find it useful. I wanted and needed something simple, something that could be activated in the bootloader menu (grub … Continue reading →

Posted in Computer / Server | Tagged admin, linux, remote, VNC | Comments Off

Got a new Kindle and no WLAN support on your router?

Posted on August 21, 2012 by robert

What’s the motivation? You CAN transfer e-books to the Kindle via USB cable, BUT that leaves a lot to be desired. Browsing the Amazon Kindle store is a very nice feature that I wouldn’t want to miss anymore. There are … Continue reading →

Posted in Computer / Server, Electronics., Software. | Tagged access point, amazon, bridged, hostapd, Kindle, linux, network, usb stick, WLAN | 2 Comments

ATtiny4313 on linux

Posted on March 7, 2011 by robert

Some time ago I had acquired an ATtiny2313 breakout board and was running into memory limitations. I ordered 2 ATtiny4313 on ebay, but could compile any code for them. As it turns out after a longer odyssey, it seems that … Continue reading →

Posted in Electronics., Software. | Tagged ATtiny4313, AVR, gcc, linux | 3 Comments

Getting Mathematica fonts to work with pdfLaTeX

Posted on February 7, 2011 by robert

I’m busy with writing some stuff and sometimes using Mathematica is simpler and quicker than using GnuPlot + Inkscape. But getting the fonts to work with LaTex / pdfLaTeX … !!! WTF !!! Now after several hours, it’s dark now, … Continue reading →

Posted in Software. | Tagged LaTeX, linux, Mathematica, pdfLaTeX, TeXLive, Wolfram, WTF | 1 Comment

PulseAudio annoyance — headphones killing my ears

Posted on October 4, 2010 by robert

“Based on code originally contributed by Marc-André Lureau we now support Flat Volumes. The idea behind flat volumes has been inspired by how Windows Vista handles volume control: instead of maintaining one volume control per application stream plus one device … Continue reading →

Posted in Software. | Tagged amarok, audio, headphones, linux, mp3, pulseaudio | Comments Off

Updating the Server — Welcome Debian, bye bye openSUSE

Posted on October 30, 2009 by robert

My provider has upgraded its VServer plans. Now offering 1GB of RAM, 20GB of disk and some more CPU power for the same price, but openSUSE was phased out. My old VServer only hat 256MB or RAM and was kinda … Continue reading →

Posted in Computer / Server | Tagged debian, linux, opensuse, openVZ, upgrade, virtuozzo, vserver | Comments Off

Blocking referer spam with mod_security2 using Apache2

Posted on March 25, 2009 by robert

I have some statistics plugins for WordPress that evaluate what sites refer to my blog. I use “WassUp”, “StatPress” and “CyStats”. Unfortunately some idiot thinks it’s funny to bombard my webserver with referer spam. Complaining to the local net-admin us … Continue reading →

Posted in Computer / Server | Tagged apache2, linux, mod_evasive, mod_security2, referer spam | Comments Off

Simple linux load monitor using the 8×8 RGB Matrix

Posted on October 26, 2008 by robert

Now that I’ve finished some of the scientific work that was monopolizing my time, here’s some geeky and nerdy gadget for Linux fans. BTW, why is it that trying to find out what “geeky and nerdy” actually means, is also … Continue reading →

Posted in Arduino., Electronics. | Tagged AVR, gadget, LED, linux, perl, PWM, RGB | 2 Comments

Tag Archives: linux

Forcing kdesu / xdg-su to honour ‘sudoers’

VirtualBox mischief – getting rid of too many pesky users

A bit of VirtualBox scripting – NAT & DHCP

SuSE museum — 7.3 to 9.1

“Easy” remote-admin — take 2

“Easy” & quite safe remote-admin for parent’s linux machine

Got a new Kindle and no WLAN support on your router?

ATtiny4313 on linux

Getting Mathematica fonts to work with pdfLaTeX

PulseAudio annoyance — headphones killing my ears

Updating the Server — Welcome Debian, bye bye openSUSE

Blocking referer spam with mod_security2 using Apache2

Simple linux load monitor using the 8×8 RGB Matrix

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Tag Archives: linux

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