My Useful Documents

One of my biggest problems is that I tend to forget the technologies that I learned so fast! therefore, I spent sometime documenting some of them. Here is the link to some of them:

Python and Bash tips:
https://docs.google.com/document/d/1bTDROhpg7YMwpW0PbM_K0I9VEl9k3JnvFw6DS_ZLupE/edit#heading=h.fgq7wdx48rqg

PyTest:
https://docs.google.com/document/d/1SmzZCnmrELgW9DksIJTaR6ECBy7fUk0Raa6jg1NmsG0/edit

GitHub and Git:
https://docs.google.com/document/d/10E5abLpL0lAnfPO9TcsbbnAElYMUK9rMNn8pCD6nhRk/edit?usp=sharing

Bash and Linux:
https://docs.google.com/document/d/1ABg9GMk-PTDGHLIU4Y48kOc-Zs8wvehGOzyn8XpFBYs/edit?usp=sharing

Docker:
https://docs.google.com/document/d/1uV78_eww4FQmNzW5cynJJJ8noM_VwKY6oPPQ0-FH1zc/edit?usp=sharing

NumPy and Matplotlib:
https://docs.google.com/document/d/1VPvQpXDywo6r142EThhRhC6WvXC51HcD_pKR8L3VqHs/edit?usp=sharing

Pandas:
https://docs.google.com/document/d/1H0ztba0e2n8hCCMxTEtq4uUTPGObq9NJLOtUX86TAuI/edit?usp=sharing

Ansible:

https://docs.google.com/document/d/1qZzsrLD0jGY28CrfEU6u8nXrLfoIOzbWBvYxwz7Ues8/edit?usp=sharing

Open Source programs cheat sheets and guides:

https://drive.google.com/drive/folders/15fMkW4BFcEw7F_5VwBq6suXqmm3s7Q92?usp=share_link

Introduction to BAZEL:

https://docs.google.com/document/d/1gC9LtrWSiZfjRH_kFYqy3IkPWMwx5u1zZNx_IDTh_3Y/edit?usp=sharing

Start using VIM at intermediate level

This text document (which is a .c file format only for fancy markup by default) is a quick intro to VIM editor that could be very useful both as a mini cheat sheet and a guide to start using it at an intermediate level without any previous knowledge.

BONUS: Also a very quick intro for TMUX is available under the "miniTMUX.txt" file.


Check it out here!

Netbill Transaction Protocol

NetBill Protocol in Theory

What is NetBill? [From Original Paper]

NetBill is a system for micropayments for information goods (digital commodities) on the Internet. A customer, represented by a client computer, wishes to buy information from a merchant’s server. An account server (the NetBill server), maintains accounts for both customers and merchants, linked to conventional financial institutions.

The NetBill Transaction Model [From Original Paper]

The NetBill transaction model involves three parties: the customer, the merchant and the NetBill transaction server. A transaction involves three phases: price negotiation, goods delivery, and payment.

Download Implementation From Github With Detailed Explanations

Implementation Of NetBill Protocol

In this project me (Navid Malek) and my fellow friend Reza Rahimi implemented most of NetBill transaction protocol, including:

• Transaction Protocol

Paper Sections

3.2. The Price Request Phase

3.3. The Goods Delivery Phase

3.4. The Payment Phase

• Error recovery (Not enough balance, Courruption, No access, etc.)

• Pseudonyms Protocol

Paper Sections

4.2. Pseudonyms

• Access Control Mechanism

Mini Access contol app not According to paper

Approach

Our main focus was to implement the protocol, so the approach we take was to use intermediary files that act as Sockets; hence, for various steps of protocol istead of writing data into socket and read from it, we have used files. In the next section, I have provided more details about the files and codes presented.

How To Run

1. run the following command in terminal: git clone https://github.com/navidpadid/NetBill_Transaction_Protocol/

2. run the codes

Here are various scenarios which I've ran the code from a fresh clone of repository.

Some scenarios include: with/without pseudonyms, with/without access to buy, with/wihtout NetBill account, with/wihtout enough credits to buy a commodity.

Download Implementation From Github With Detailed Explanations

Limited DevOps Documents

Download From Github With Explanations

Various limited documents from my work tools when I used to work as DevOps Engineer, these are basic usage and limited testing results ( because I don't have the premission to publicize the full documents that I have written for my work )

Description:

ETCD_CLUSTER.pdf ==> Setting up an ETCD cluster

objective:

• setup an etcd cluster on 3 servers

• write appropriate service to be sure ETCD will be always running

• ETCD version ==> 3.3.9

• server OS ==> CentOS7

The related ansible code are in the mycontrolansible directory.

LizardFS.pdf ==> Setting up LizardFS and testing it

objective:

• setup simple LizardFS master on one server

• test LizardFS performance on 3,5,7 chunk servers (HDD)

• test LizardFS performance on SSD

• LizardFS version ==> 3.12

ProxySQL.pdf ==> Set up and testing ProxySQL

objectives:

• setup ProxySQL load balancer on one server

• configuring ProxySQL

• test the performance and load balancing of ProxySQL with SYSBENCH

• setup ProxySQL architecture with no single point of failure

telegrafLogparser.pdf ==> Using Telegraf to Parse Custom Logs

objective:

• read custom logs with telegraf

• parse custom logs with telegraf

• generate an output from custom logs to influxdb

The TIG stack [ telegraf, influxdb, grafana ]

DatabaseTestDoc.pdf ==> Testing Database response time

We will test 4 databases ( this doc is very limited and acts as a road map for more professional tests ):

RDB: -mysql -postgres

No-SQL: -mongo -cassandra

GrafanaPrometheus.pdf ==> Setup Prometheus and Grafana for monitoring (very basic)

objectives:

• setup Prometheus server

• setup Prometheus exporters

• setup Grafana server

• setup Grafana dashboard

GalleraCluster.pdf ==> Setting up a MySQL Gallera cluster (very basic)

objective:

• setup an MySQL Gallera cluster on 3 servers

• write apporopiate service to be sure MySQL Gallera cluster will be always running

• MySQL version ==> 5.7

• MySQL-wsrep ==> 5.7

• server OS ==> CentOS7

TCP_tune.pdf ==> Some TCP tuning parameters that i have gathered form internet ( this is a messy doc, just gathered information from Internet, for more info on TCP_TUNING refer to my blog! )

 

Download From Github With Explanations

Google Firebase - pure HTML & CSS

This is clone from Googles Firebase, done purly in HTML and CSS without anything else ( even Javascript).

The goal was to :

• improve pure HTML CSS capabilities (without frameworks and libraries like bootstrap) 
• Responsive Design from scratch 
• Improve inspect element capabilities
• Read leading website developers UI code (here Google)

Codes:
https://github.com/navidpadid/web96RMN/tree/master/hw1_final

Contributors:
navid malek
reza rahimi

 

 

the Real website:

 

 

 

The Fake: