Rolling Deployments 滚动部署

The Rolling Deployment strategy consists of rolling out new version instances by replacing the old version untill all the instances are rolled out. 滚动部署策略包括通过替换旧版本来推出新版本实例，直到所有实例都推出。

During the deployment users might experience two versions of the application. 在部署过程中，用户可能会遇到两个版本的应用程序。

Pros优点 1. Easy to implement and less risky 易于实施，风险较小 2. Supported by default by most technologies like kubernetes. Kubernetes 等大多数技术默认支持 3. It doesn't incur any additional cost. 不产生任何额外费用。

Cons缺点 1. Slow deployment and rollback. 部署和回滚慢。 2. Not suitable for large-size infra. 不适合大尺寸的infra。 3. No control over traffic. 无法控制流量。 4. User experience can be affected during the deployment. 部署过程中会影响用户体验。