Classic Process

• Dev and Ops with a different priorities
  • Dev => Implementing Features
  • Ops => Stability of System/Application

DevOps

• Dev & Ops with a same mind set, Deploy ASAP

Class SRE implements DevOps

Site Reliability Engineering (SRE)

• SRE is the way google deploys & maintains Applications
• Define the Following
  • SLI (Service Level Indicator)
  • SLO (Service Level Objective)
  • SLA (Service Level Agreement)

SLI

• Any important metric that is measured over a certain period of time
• Eg:

Latency < 100 ms over last 5 mins

page response < 1 sec over last 5 mins

Service Level Objectives

• Metric over a larger period of time
• Eg

Application will be up 99.95% of the time over last month

Service Level Agreement

• Get an agreemnet with the customer on Some SLO and if it not met you are supposed to pay the customer with some rewards