Rolling Update
Rolling update is a deployment strategy used in software development and DevOps to update applications or services with minimal downtime by incrementally replacing old instances with new ones. It involves gradually shifting traffic from the old version to the new version, ensuring the application remains available throughout the process. This approach is commonly used in containerized environments and cloud platforms to manage updates smoothly.
Developers should use rolling updates when deploying updates to production environments that require high availability, such as web services, APIs, or microservices, to avoid service interruptions. It is particularly useful in scenarios where zero-downtime deployments are critical, such as e-commerce sites or real-time applications, as it reduces risk by allowing rollback if issues arise. This strategy is essential in modern DevOps practices for continuous delivery and maintaining system reliability.