Configuring a SAML IDP with LDAP as authentication source


In this setup, the SAML IDP will be available at and we will use the ldap server configured in this post.

Start by moving to the directory above the DocumentRoot for the domain. Let’s say that it is /var/www/, so

cd /var/www/

Download the latest simplesamlphp version

wget && tar xvfz simplesamlphp-1.14.4.tar.gz

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Installing and configuring LDAP and phpldapadmin


This will be a minimal setup. It’s a good idea to start by doing an update and upgrade on your system. In debian, use:

apt-get update && apt-get upgrade

Install the packages (set and confirm admin password)

apt-get install slapd ldap-utils phpldapadmin

Then vim /etc/ldap/ldap.conf and include:

BASE dc=example,dc=net
URI ldap://

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Quick proxy script for sharing internet among devices


I created this script to automatize sharing of the hotspot connection I’m using.

My laptop is connected to the hotspot wifi. This internet connection will be shared to a router via an ethernet cable (which is also plugged to the laptop). The router then will distribute the connection to multiple devices.

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Docker guide


Install docker (you may need to reboot afterwards)

pacman -S docker

Start docker

systemctl start docker

Check docker information

docker info

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Debugging your car’s battery and alternator with a multimeter



In order to minimize eventual residual surface charges, consider to leave the radio or headlights on for a couple of minutes prior to the measurement procedure.


1. Set your multimeter to DCV and select a range at least above 15V.
2. Connect the multimeter leads (black is ground) to the battery. The optimal reading is around 12.6V.
3. Now start the car with the multimeter connected to the battery. Voltage should not drop lower than 10V (it’s ok to drop to 11V).
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Adding a (hidden) folder to your Linux $PATH


Create a hidden .bin folder somewhere you like. I did it on my home folder:

mkdir ~/.bin

You can add this folder to your $PATH by adding to .bashrc:

## Path
export PATH=$PATH:/home/dth/.bin

Now let’s test by adding a bash script I wrote called qdb (creates SQL DB, user and pwd)

cd ~/.bin && wget

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Calculator written in C for the 555 timer IC

+5 ---+---------------+---+
      |               |   |
      R            +----------+
      |            |  8   4   |
  +---+------+-----|7        3|------/\/\/\---+------- Vout
  :          |     |  LMC555  |               |
  C to test  +-----|6         |             -----
  :                |          |             -----
ground       +-----|2        5|----+          |
             |     |    1     |    |        ground
             |     +----------+  0.1 uF
             |          |          |
   Clock ----+        ground     ground

I needed a quick calculator for the 555 chip and decided to write one in C. Enjoy.
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