The difference between day-0, day-1, and day-2 operations

Operations teams play a critical role in software delivery, comparable in importance to developers, as highlighted by the DevOps methodology, which underscores the need for improved collaboration between development and operations. The article explores the three core phases of software operations: day-0, day-1, and day-2. Day-0 involves planning, addressing infrastructure needs, and assessing financial implications before any deployment. Day-1 focuses on the deployment process, requiring careful management and often automation to reduce anxiety and ensure smooth execution. Day-2 encompasses post-deployment activities, including monitoring, routine maintenance, and responding to infrastructure failures, ensuring ongoing application performance. The perception that operations only occur in day-2 is challenged, emphasizing their ongoing involvement throughout the deployment pipeline. Tools like Octopus facilitate deployment automation and support operations teams in maintaining software performance across all phases.