Tech notes

Markdown Syntax

print('This is a test')

Alarm

Webstuff

PHP ADFS SSO

• Booking system running on PHP using ADFS authentication for secure logins.
  AD in applications for SSO
  SimpleSAML.php is an award-winning application written in native PHP that deals with authentication. The project is lead by UNINETT, has a large user base, a helpful user community and a large set of external contributors.
  https://simplesamlphp.org
  

Linux

Active/Passive failover (VRRP)

• Keepalived
  Keepalived implements a set of checkers to dynamically and adaptively maintain and manage loadbalanced server pool according their health. On the other hand high-availability is achieved by the Virtual Router Redundancy Protocol (VRRP).

  • Resources:
    Video on Active-Passive Cluster with Keepalived & HAProxy (Mar 20, 2020)
    Docker GitHub for osixia/docker-keepalived
    
    

• HAProxy HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for very high traffic web sites and powers quite a number of the world's most visited ones. Over the years it has become the de-facto standard opensource load balancer, is now shipped with most mainstream Linux distributions, and is often deployed by default in cloud platforms.

  • Resources:
    Video on HAProxy Crash Course (TLS 1.3, HTTPS, HTTP/2 and more) (Dec 27, 2019)
    
    

• MySQL sorry :(
  mysql_connect() function doesn't exist in PHP7.0. Migrate to PDO instead.

Windows

10

• Build in terminal packet sniffer pktmon
  Microsoft released with the October 2018 Update a built-in packet sniffer for Windows 10 located in C:\Windows\system32\PktMon.exe. In order to collect packets you need to launch a Windows 10 command prompt as admin before using PktMon.