Serhiy Kalinets "Building .NET Services for Kubernetes"

Mar 19, 20200 likes113 views

За час існування .NET сформувався певний набір практик і підходів для побудови сервісів. Однак з появою .NET Core та можливістю використання раніше недоступних інструментів, як-то контейнерів, екосистеми Linux тощо, а також зміни базових засад у самому фреймворку (наприклад, конфігурування), виявилось, що треба ці практики та підходи переглянути. Інакше замість приємного відчуття причетності до створення прекрасного розробники отримують нервові розлади від того, що все розвалюється на шматки. У цій доповіді ми обговоримо що треба а чого не треба робити, коли ми розробляємо сервіси під Kubernetes, аби щоразу отримувати чудовий результат з мінімумом зусиль.

Building .NET Services
for Kubernetes
Serhii Kalinets

Cloud Ready Applications
12 Factor Apps
Can run anywhere
Can scale horizontally
All without code change

Cloud Ready Evolution
Bare Metal
VMs
Cloud
Containers

Serhiy Kalinets "Building .NET Services for Kubernetes"

To use kubernetes
you need to think
as kubernetes.

Code
- No HTTPs support
- Lightweight logging
- Fast start / graceful shutdown
- No multithreading

Concurrency
Is handled by scaling out processes
Prefer single threaded code

No In-Memory Cache
Does not scale
Use distributed cache
(redis, memcached etc.)

Configuration
- Environment Variables (12 factor apps)
- XXXsettings.json
- Settings separate from code

Configuration in k8s
- Services are available as env vars on all pods
- Configmaps for configuration files
- Secrets for secrets
- Keep config out of source code repo

Why build in Docker?
- No need for custom setup of build agents
- Builds are reproducible
- All build infrastructure is in code repository

During Build
- Run tests
- Static Code Analysis (roslyn analyzers)
- Versioning (gitversion)

gitversion
- Run gitversion during build
- Use version info for
- Tagging docker image
- Tagging revision in git
- Export gitversion output to json file
- Add this file as custom configuration source
- Add version controller that will use this configuration to show the
current version

Infrastructure concerns
Should not be in code

Use of Sidecars
Logging / Monitoring
Routing
Authorization / Authentication
Cache

Probes and Hooks
Liveness probe
Readiness probe
Startup probe
PostStart hook
PreStop hook

k8s Jobs and Crons
Use instead of timers inside your service
Can be just scripts, not compiled code
Are scaled independently of main service

k8s Operators
Databases
Monitoring Tools
Service Mesh

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One of the biggest challenges in workplace communication is expressing dissatisfaction and providing feedback. Over 50% of misunderstandings arise in these situations, regardless of the project. Add emotional burnout and cultural differences, and the consequences can become serious. In his speech, Alexey will tell share feedback tools that work effectively for IT professionals. He will explore why many cultures struggle with giving and receiving constructive criticism and how fundamental argumentation principles, combined with simple empathy-based techniques, can help prevent more than half of potential conflicts.

"Perfectionisin: What Does the Medicine for Perfectionism Look Like?", Manoil...Fwdays

Every true perfectionist has heard at least once in their life that nothing and no one is perfect, so you just need to lower your standards, stop stressing over details, and allow yourself to make mistakes. After all, we learn from our mistakes, and only those who do nothing never make mistakes. And while all of this is true, the likelihood that it has helped you in any way is about 0.0000000000001%. In her presentation, Maria will talk about the revolutionary drug Perfectionisin. We will take a deeper look at perfectionism, understand what lies behind it, and focus on addressing the root causes. In other words, treating the disease, not just the symptoms.

"39 offers for my mentees in a year. How to create a professional environment...Fwdays

Mentoring is not only about sharing experience from an established specialist with someone new in the field but also beneficial for the mentor than for the mentee. Creating a positive reputation among recruiters and the community, scaling yourself and your impact through content, reviewing pet projects to develop confidence, and increasing the number of proposals from employers are just some of the benefits that a tech professional can achieve through mentoring. I will also share how mentoring beginners helped me to be hired into my current position. The presentation will help experienced specialists who want to build a professional community but are unsure of its benefits.

"From “doing tasks” to leadership: how to adapt management style to the conte...Fwdays

Ever noticed that one team runs like a well-oiled machine while another keeps getting stuck? Why does one developer thrive on freedom while another panics without clear instructions? And most importantly—how do you handle this when you’re no longer just coding, but leading? In this talk, we’ll break down how to choose the right leadership style depending on the situation and the maturity level of your team: 🔹 When to control and when to step back (Hersey-Blanchard Situational Leadership Model). 🔹 How to assess uncertainty levels and respond effectively (Stacey Matrix & Cynefin Framework). 🔹 How to delegate without endless clarifications (Management 3.0 Delegation Levels). 🔹 Why simply “assigning tasks” is a failure and how to communicate effectively (Leadership Ladder). 🔹 What motivates people beyond money and how to use it (Moving Motivators). This talk is for those who want to stop “putting out fires” and start influencing people and outcomes like a pro.

[QUICK TALK] "Why Some Teams Grow Better Under Pressure", Oleksandr Marchenko...Fwdays

What will be discussed? What distinguishes pressure from chaos in product teams? Why do these concepts often blur, and how can teams learn to navigate the fine line between them? What helps teams grow beyond their limits? Why do mature teams lose sensitivity to growth stimuli, while younger teams struggle to define their approach to growth? What breaks teams, and what strengthens them? How can managers develop a strategy for managing team pressure, and how can teams properly perceive and leverage that pressure?

[QUICK TALK] "How to study to acquire a skill, not a certificate?", Uliana Du...Fwdays

How many certificates do you have on your shelf or on LinkedIn? Now the real question is: did these courses really help you develop your skills? Learning is not just a line on your resume, it makes a real difference in your work and life. In her speech, Uliana will share practical tools that will help you learn so that your knowledge works and your skills are strengthened, not just add to your collection of certificates. We will talk about effective approaches to learning, motivation, and how to avoid the trap of the “eternal student”.

[QUICK TALK] "Coaching 101: How to Identify and Develop Your Leadership Quali...Fwdays

What does it mean to be a leader, and what qualities should you develop in yourself? And how do you know if you even have these skills? This isn’t just a question—it’s the key to understanding where to start and how to move forward in unlocking your potential. Let’s break down leadership and coaching as a tool for unleashing your leadership potential. We’ll explore how coaching differs from mentoring, psychotherapy, and training—and why they’re not all the same. Special focus will be on self-coaching: learning to engage in an internal dialogue so you can keep moving forward even when external support is lacking. I’ll share a few practical life hacks and real-world examples that will help you create a plan and start taking action as soon as tomorrow.

"Dialogue about fakapas: how to pass an interview without unnecessary mistake...Fwdays

A mix of practical advice and real-life stories, where two experts share the secrets of successfully passing all stages from the prescreen to the final conversation. An interview is always a challenge, regardless of experience. Is it possible to avoid common mistakes and increase your chances of success? Yes! The main thing is to know how to prepare properly and what tricks to avoid. At this talk, two experts will share real-life stories and practical advice on how to go through all the stages from the first prescreen to the final conversation. We will analyze typical mistakes of candidates, explain how not to disrupt the offer at the last moment, and give recommendations that will help you feel confident during the interview.

"Conflicts within a Team: Not an Enemy, But an Opportunity for Growth", Orest...Fwdays

Conflicts within a team are not always a bad sign. On the contrary, they can become a powerful tool for development. In this talk, Orest will share my experience and practical tools for resolving conflicts constructively, which help not only maintain harmony in the team but also improve its overall performance. You will learn how to turn conflicts into opportunities to strengthen team bonds, enhance communication skills, and achieve better results.