Dasith Wijesiriwardena dasiths

The moment you mention 𝗞𝘂𝗯𝗲𝗿𝗻𝗲𝘁𝗲𝘀 in a Devops interview, expect a deep dive

Here are 17 Kubernetes questions I was asked that dive into architecture, troubleshooting, and real-world decision-making:

Your pod keeps getting stuck in CrashLoopBackOff, but logs show no errors. How would you approach debugging and resolution?
You have a StatefulSet deployed with persistent volumes, and one of the pods is not recreating properly after deletion. What could be the reasons, and how do you fix it without data loss?

	import os
	from typing import Optional, Dict, Any
	from contextvars import ContextVar
	from fastapi import FastAPI, Request, Depends, HTTPException
	import httpx
	import logging
	import uvicorn
	from functools import wraps

	# OpenTelemetry imports

	import logging
	import threading
	from typing import Dict, List

	from azure.monitor.opentelemetry.exporter import (
	AzureMonitorLogExporter,
	AzureMonitorTraceExporter,
	)
	from flow_nodes.core.ConfigProvider import (
	IsDevelopmentEnvironment,

	using Microsoft.EntityFrameworkCore;

	Console.WriteLine("Hello, World!");
	using var x = new MyDbContext();
	x.Database.EnsureCreated();

	var paramValueDateTimeOffset = DateTimeOffset.Now.AddDays(-1);
	var paramValueDateTime = DateTime.Now.AddDays(-1);

	var query = x.CustomerLeases.Where(c => c.TextDateTime >= DateTimeOffset.Now

	/*
	More about Azure.Identity client library: https://devblogs.microsoft.com/azure-sdk/azure-identity-august-2020-ga/
	Guidance on migrating from old Microsoft.Azure.Services.AppAuthentication library: https://docs.microsoft.com/en-us/dotnet/api/overview/azure/app-auth-migration

	This is useful when the user account running the application locally in Visual Studio doesn't have permissions to the resources (i.e. Due to network restrictions/vpn or policy requirements).
	We create a SP/AppRegistration and use that identity when running things locally.

	TokenCredential is the base class for all credential types used for identity in Azure
	like DefaultAzureCredential, ManagedIdentityCredential, EnvironmentCredential, ClientSecretCredential, VisualStudioCrdential etc (https://devblogs.microsoft.com/azure-sdk/azure-identity-august-2020-ga/#more-credential-types)

	// Reading
	// https://tsuyoshiushio.medium.com/correlation-with-activity-with-application-insights-1-overview-753a48a645fb
	// https://tsuyoshiushio.medium.com/correlation-with-activity-with-application-insights-2-activity-deep-dive-2a4147919659
	// https://medium.com/prospa-engineering/implementing-distributed-tracing-with-azures-application-insights-5a09cc1c200c

	var activity = new Activity("Call to CosmosDB");
	// activity.SetParentId("correlation id from request")

	//RequestTelemetry for Request, DependencyTelemtry for Dependencies
	using var operation = telemetryClient.StartOperation<DependencyTelemetry>(activity);