Approaches to Achieving Zero-Downtime Deployments Source – https://www.fool.com As the name suggests, a zero-downtime deployment is one where there is no disruption to your application or service. This means that it can be deployed without causing any downtime for your service users. While this may sound like an impossible feat, there are some ways to achieve this goal. In this post, we’ll look at some approaches to help you achieve zero-downtime deployments for your applications, so you don’t have to worry about downtime when deploying updates! Why does downtime happen? Downtime can happen for a variety of reasons, but the most common are: Issues with the application – If you’re a developer, you’re probably familiar with this scenario: You’ve worked on a new feature for weeks and finally sent it through QA. It looks like everything is ready to go; however, once it’s deployed and users begin interacting with it, they report that some feature isn’t working as expected. Infrastructure issues – This can be anything from an issue in your load balancer configuration to a misconfigured DNS entry pointing to the wrong IP address (or even one pointing nowhere). Issues with the deployment process – This includes inadequate testing procedures or creating too many manual steps in your deployment process, which causes delays before code is applied into a production environment. How to achieve zero-downtime deployments In this article, we’ll examine the different approaches to achieving zero-downtime deployments and look at an approach that can help you get started. You’ll learn about blue-green deployments, rolling deployments, and canary deployments—all of which have pros and cons. At the same time, dependency resolution is vital to achieving zero-downtime deployments. For example, when dealing with the dependency resolution of Rust crates, a Cargo registry can help you avoid downtime by providing a central location to store your dependencies. What is blue-green deployment? Blue-green deployment is a technique for deploying software to minimize disruption to users. A blue-green deployment is a type of continuous deployment, which means the new version of your software will be running in production within minutes of being built and tested. Blue-green deployments are most effective when you have multiple web service endpoints or instances available for your application — or if you’re working with an external system that you need to vary across two different points in...