"Knowledge is powerful, be careful how you use it!"

A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools, and more.

What is it?

This repository is a collection of various materials and tools that I use every day in my work. It contains a lot of useful information gathered in one piece. It is an invaluable source of knowledge for me that I often look back on.

For whom?

For everyone, really. Here everyone can find their favourite tastes. But to be perfectly honest, it is aimed towards System and Network administrators, DevOps, Pentesters, and Security Researchers.

Contributing

If you find something which doesn't make sense, or something doesn't seem right, please make a pull request and please add valid and well-reasoned explanations about your changes or comments.

A few simple rules for this project:

• inviting and

An updated and organized reading list for illustrating the patterns of scalable, reliable, and performant large-scale systems. Concepts are explained in the articles of prominent engineers and credible references. Case studies are taken from battle-tested systems that serve millions to billions of users.

If your system goes slow

Understand your problems: scalability problem (fast for a single user but slow under heavy load) or performance problem (slow for a single user) by reviewing some design principles and checking how scalability and performance problems are solved at tech companies. The section of intelligence are created for those who work with data and machine learning at big (data) and deep (learning) scale.

If your system goes down

"Even if you lose all one day, you can build all over again if you retain your calm!" - Thuan Pham, former CTO of Uber. So, keep calm and mind the availability and stability matters!

This repo contains questions and exercises on various technical topics, sometimes related to DevOps and SRE :)

There are currently 1553 questions

To learn more about DevOps and SRE, check the resources in devops-resources repository

You can use these for preparing for an interview but most of the questions and exercises don't represent an actual interview. Please read Q&A for more details

Join our DevOps community where we have discussions and resources on DevOps

You can add more questions and exercises by submitting pull requests :) Read about contribution guidelines here

DevOps	Jenkins	Git	Ansible	Network	Linux	Terraform
Programming	Python	Go	Shell Scripting	Kubernetes	Prometheus	Mongo
Cloud	AWS	Azure	Google Cloud Platform	OpenStack	Security	Puppet
Monitoring	Elastic	Virtualization	DNS	Operating System	Distributed	General
Testing	Databases	Regex	System Design	Hardware	Big Data	Questions you ask
Certificates	Containers	SQL	OpenShift	Storage	HR	Exercises

DevOps

"A great Admin doesn't need to know everything, but they should be able to come up with amazing solutions to impossible projects." - cwheeler33 (ServerFault)

"My skills are making things work, not knowing a billion facts. [...] If I need to fix a system Ill identify the problem, check the logs and look up the errors. If I need to implement a solution Ill research the right solution, implement and document it, the later on only really have a general idea of how it works unless I interact with it frequently... its why its documented." - Sparcrypt (Reddit)

This project contains 284 test questions and answers that can be used as a test your knowledge or during an interview/exam for position such as Linux (*nix) System Administrator.

The answers are only examples and do not exhaust

How they SRE

A curated collection of publicly available resources on how technology and tech-savvy organizations around the world practice Site Reliability Engineering (SRE)

Introduction

How They SRE is a curated knowledge repository of best practices, tools, techniques, and culture of SRE adopted by the leading technology or tech-savvy organizations.

Many organizations regularly come forward and share their best practices, tools, techniques and offer an insight into engineering culture on various public platforms like engineering blogs, conferences & meetups. The content is curated from these avenues and shared in this repository.

Note to readers: This list refers to some of the articles, posts, videos, tools, and techniques published before 2015. Please use such material with caution as there may be recent advances in technology and practices which offer better alternatives and perspectives.

Topics

• Site Reliability Engineering
• Hiring and Building SRE teams
• SRE Culture
• DevOps
• Monitoring & Observability
• Alerting
• Incident Response

Monitor your applications and troubleshoot problems in your deployed applications, an open-source alternative to DataDog, New Relic, etc.

SigNoz helps developers monitor applications and troubleshoot problems in their deployed applications. SigNoz uses distributed tracing to gain visibility into your software stack.

You can see metrics like p99 latency, error rates for your services, external API calls and individual end points.

You can find the root cause of the problem by going to the exact traces which are causing the problem and see detailed flamegraphs of individual request traces.

Features:

• Application overview metrics like RPS, 50th/90th/99th Percentile latencies, and Error Rate
• Slowest endpoints in your application
• See exact request trace to figure out issues in downstream services, slow DB queries, call to 3rd party services like payment gateways, etc
• Filter traces by service name, operation, latency, error, tags/annotations.
• Aggregate metrics on filtered traces. Eg, you can get error