Tutorials Index Page 4


Elastic search with python

In this tutorial, we are going to use python and elastic search. We are going to cover from scratch how to use elastic search using python. The tutorial could be read by python and elastic search beginners.


Bitcoin electrum wallet install from source code

In this tutorial, we are going to install all bitcoin electrum dependencies from source code and make it work with PyQT5. we provide a step by step tutorial to install bitcoin electrum.

Install dropbox from source in debian stretch

In this brief tutorial we are going to explain how to build dropbox from the source code in Debian Stretch

How to create ldap users using a python script

In this tutorial, we are going to create a script to create many users on ldap. The input of the script will be a csv file with a list of users. You can later modify the script for your needs, like adding click library to create individual users.


How to configure L2TP VPN on the UniFi Security Gateway?

In this tutorial, we are going to configure the UniFi USG VPN (L2TP) for remote access using a VPN. The whole tutorial is 3 steps and a fourth optional for VPN client configuration. The first step is enabling the radius server, the second the user creation and the third one is where you create the VPN network using L2TP type. No advance knowledge is required to follow this steps.


Understanding the go scheduler

The scheduler tries to use a small number of kernel threads to support high concurrency. It will leverage parallelism to scale to many cores. In this tutorial, we explain with some details how the go scheduler works to distribute goroutines over kernel threads.


How to change postgresql database encoding to UTF8 from SQL_ASCII

In this tutorial, we explain how to change the encoding of a database in PostgreSQL. Use sudo -u postgres psql -C “SHOW SERVER_ENCODING” your_database to display the database encoding. You can create a new database with utf8 using the command: sudo -u postgres createdb -E utf8 your_database. If you already have a database with SQL_ASCII and you want to convert it to utf8 you will need to regenerate it, check here for the full guide.

Introduction to asynchronous networking programming with go

With go you don’t have threads, you have goroutines which are very cheap in terms of stack and scheduling. Go has a scheduler which works like an event loop, but it allows the developer to forget about events, queues, saving state, etc. Check our tutorial to learn to go networking programming.


Ubuntu upgrade postgres to version 10

In this tutorial we are going to upgrade PostgreSQL 9.X to 10. The following steps will work for Ubuntu 14.04, 17.04 and 16.04. Check our guide for easy upgrade with some troubleshooting also.


Flask abort with json example

In this short tutorial we show an example on how to return a json when using flask.abort: abort(jsonify(message="Message goes here"), 400). See alse an alternative using flask handlers to return a json.