What are Day-0, Day-1, and Day-2 Operations?

The concept of Day-0, Day-1, and Day-2 operations refers to distinct phases of managing infrastructure, applications, or services in DevOps and cloud operations. Day-0 focuses on design and planning, Day-1 involves deployment and configuration, and Day-2 focuses on maintenance, monitoring, and ongoing operations after launch. The framework complements the broader DevOps workflow but focuses on the operational requirements surrounding a launch. It helps prevent errors and oversights, improving operational stability at scale by providing a clear outline of what your release lifecycle should look like. Properly executed Day-0 operations are critical for achieving streamlined Day-1 (deployment) and Day-2 (operations and maintenance) activities, supporting the full infrastructure lifecycle.

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