Twender

• presentation

• source code

• A Django REST framework API designed to act as a virtual matatu(public transport system) conductor by managing payments and passenger trips.

• The application features role-based access for passengers and condutors

Features

• User registration and JWT Authentication
• Role-Based access Control(passenger)
• Dynamic fare calculation based on dynamic routes, stops and peak-hours
• passenger endpoints to create trips
• conductor-only endpoint to view passenger destination and payment statuses
• conductor-only ability to update the payment status

Structure

-Twender - Users App: Handles user registration, login an profiles

What is containerization

A container is a package that simulates the underlying operating system and is packaged with all the dependecies that your application need to run. Unlike a Virtual Machine that simulates and virtualise the underlying hardware, a container only virtualise the OS. They provide a way to package applications with required dependencies that is seperated from the host OS. This enables the application to run out-of-the-box despite running on a different underlying enviroment other than the one its was compiled on. Containers basically act as lightweight VMs and they share the underlying OS.

Linux Based Environment

Goal: identify faulty server to find the root cause, gather evidence, either resolve the issue or escalate it. Assumptions

• An incident has been declared and the server is suspected to be involved
• The operations person has login credentials(SSH and password)
• The existent of a ticketing or issue tracking system(Jira, ServiceNow)

phase1: preparation and initial assessment

Acknowledge the assigned ticket:

• Take up the assigned ticket and read through the details
• From this point, document every action carried out, command run and the timestamp for better documentation in the postmortem Gather context:
• Understand the issues presented or associated with the server in the ticket(e.g ‘slow server’, ‘API returning 500’, ‘Users unable to login into the domain’ )
• Understand the issue reported so as to know what to tackle: * what errors are presented
  • what services are hosted in the server?
  • Are any other services in the server experiencing the same issue?
  • Check for monitoring dashboards before logging in(DataDog, Grafana, Nagios, ) look for obvious anomalies:

    High CPU/Memory Usage Latency spikes Error rate increase Health check failures