What is Zero-Downtime?
Zero downtime deployment can be defined as the deployment method where the website or application is never in an unstable state or down during the deployment process. To achieve zero-downtime deployment, the web server does not begin to serve the changed code till the time the entire deployment process is complete. To accomplish the lofty goal of zero downtime, redundancy becomes a crucial requirement at every level of your infrastructure. If you are using cloud hosting, check if you are redundant to alternate availability regions and zones. You should also check if you are using geographically distributed load balancing. See if you have multiple clustered databases on the backend, and multiple web servers load balanced. All of these requirements increase uptime. Testing brings you closer to attaining zero downtime. The solution is to pull the trigger on sections of your infrastructure. They should failover quickly without a noticeable outage, which is the ultimate test here.
Business Benefits of Zero Downtime Deployment
- Drives a competitive advantage
- Saves money
- Boosts productivity and growth of your business
- Makes business operations smooth and seamless
- Improves allocation of resources