What is DevOps?

DevOps is the combination of cultural philosophies, practices, and tools that 
increases an organization’s ability to deliver applications and services at high 
velocity, evolving and improving products at a faster pace than organizations 
using traditional software development and infrastructure management processes.

 This speed enables organizations to better serve their customers and 
 compete more effectively in the market

DevOps CAMS

• Culture

  people → process → tools
  

• Automation

  Thousands of servers are impossible to manage but do you need thousand servers ?
  how much can you automate ? or should you automate ?
  

• Measurement

  It's not just about infra measurement. business measure, client activity 
  and other pointers. Recovery time, cycle time are obvious but it's important 
  to measure and incentivise it.
  

• Sharing

  share responsibility, share ownership and no escape goat. feedback loop is important
  

DevOps 3 ways

• flow thinking
• amplify feedback
• experiment and learn

Big Overview

• People over process over tools
• Continuous delivery
• lean management
• Infrastructure as code

IT Divide

• Developers wants to deliver features fast and deploy them quickly.
• Ops wants system to be stable and uptime is most important to them.

DevOps

• Blameless Postmortems
• transparent downtime
• Integrate team - devs and Ops
• Extension of agile
• IAAC - GIT for ops

DevOps Basic Terminologies

• Provisioning -> Server is ready with OS, software and networking

• Deployment -> adding or upgrading software on server

• Orchestration -> coordinated operations on multiple systems

• Configuration management -> managing server configuration via files such as ram, space, dependency softwares etc

• Imperative (procedural) -> commands to produce desired state

• Declarative (procedural) -> desired state is defined and tools will achieve it

• idempotent -> repeat execution and same result

• blue green deployment -> Identical deployment, used as switch

• Continuous Integration -> Build and unit test at every checkin

• Continuous Delivery -> deploy on production live environment at every checkin

• Continuous Deployment -> After unit testing, deploy changes to production in small batches