MyBlueLinux.com

SPF - Sender Policy Framework

Sender Policy Framework (SPF) is an email authentication method designed to detect forged sender addresses in emails (email spoofing), a technique often used in phishing and email spam. SPF allows the receiver to check that an email claiming to come from a specific domain comes from an IP address authorized by that domain's administrators.

Networking Security

What is email envelope and email header

The key for understand smtp protocol is learn, what is difference between email envelope and email header. Another words, what is email envelope vs email header.

Networking Security

The most important Redis data structures you must understand

Redis is the world's most popular in-memory data structure server. In order to make good use of it, we need to understand its basic data structures first. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs and geospatial indexes with radius queries.

Linux

Python Dictionaries on Steroids with Python-benedict

Python-benedict is a powerful Python library that extends the capabilities of Python's built-in dictionary (or dict) class. The library enables you to easily access, search, and modify nested values, manipulate and transform data, and convert various formats to and from dictionaries. As the dictionary is one of the most commonly used data structures in Python, this library could be a potential boost to productivity.

Python Development

Webserver in bash - execute bash command

Do you want a quick, dirty, and unsafe way to execute commands to your Linux box over HTTP? You can use the following hack! I don't recommend using this for a production system or something more important than a hobby project.

Linux Bash

Nginx TLS TCP Proxy server for tcp upstream servers

This article explains how to set up SSL termination for NGINX server and a load-balanced group of servers that accept TCP connections. And how configure NGINX as tcp proxy server for multiple tcp backends with SSL/TLS support.

Web Servers Security

Bash Parameter Substitution

What is linux bash parameter substitution and how use it

Linux Bash Development

BASH - Check IP is in range of ip pools

I have a list of IPs in MAXCDN_ARRAY to be used as whitelist. I want to check if a specific IP address is in range in this array. How can I structure the code so that it can compare all IPs in the array and say the specific IP in in range of this list or not?

GrepCIDR

You can use grepcidr to check if an IP address is in a list of CIDR networks.

Linux Bash Development

Pyhon Lru Cache with time expiration

In this tutorial, you'll learn: How to expand the functionality of the @lru_cache decorator and make it expire after a specific time

Python Development

How to Test an SMTP Server with Telnet command line

How to test SMTP and IMAP servers using the telnet command-line

Linux Networking Windows

Nginx Location Priority Manual

The location directive within NGINX server block allows to route request to correct location within the file system. The directive is used to tell NGINX where to look for a resource by including files and folders while matching a location block against an URL. In this tutorial, we will look at NGINX location directives in details.

Linux Networking Web Servers

Asynchronous HTTP Requests in Python with aiohttp and asyncio

Asynchronous code has increasingly become a mainstay of Python development. With asyncio becoming part of the standard library and many third party packages providing features compatible with it, this paradigm is not going away anytime soon.

Let's walk through how to use the aiohttp library to take advantage of this for making asynchronous HTTP requests, which is one of the most common use cases for non-blocking code.

What is non-blocking code?

You may hear terms like "asynchronous", "non-blocking" or "concurrent" and be a little confused as to what they all mean. According to this much more detailed tutorial , two of the primary properties are:

Python Development