The Zero Downtime Deployment

(La version Fr est diponisble ici)

Zero Downtime Deployment known by its acronym ZDD is the act of deploying a new version of your application code without maintenance or deterioration of service, most of the time when we talk about ZDD we focus on the switchover of a version N to a version N+1 without interruption of service via different strategies:

• The Blue Green Deployment
• The Canary Deployment
• The Rolling Deployment

This article is focus on the ZDD from the application code side, if as a developer we do not necessarily have control over the deployment scripts and the chosen strategy, we must still ensure that our application is 100% functional and that even if the deployment fails or takes a lot of time, I will take 3 classic cases:

• Database schema updates ⏺
• API body updates 📞
• Update of messages published in asynchronous workers 📩

I was saying that the ZDD is the fact of deploying without maintenance,

YES, no more releases in production at dawn 🐓 or dusk 🌃.

We deploy at any time 😍.

⚡️ Releases must be transparent for end users and to achieve this, it is necessary to ensure that the modifications made are…