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How do you handle database in blue-green deployment?
There are two requirements for implementing blue-green deployments using a shared database:
- Make all database changes backward compatible. Any changes made to the database schema must not break the existing application.
- Decouple database changes from application changes.
What is a blue-green deployment model?
Blue green deployment is an application release model that gradually transfers user traffic from a previous version of an app or microservice to a nearly identical new release—both of which are running in production.
How does blue-green deployment works?
Blue-green deployment is a technique that reduces downtime and risk by running two identical production environments called Blue and Green. At any time, only one of the environments is live, with the live environment serving all production traffic. Green is now live, and Blue is idle.
What is blue green database?
The basic concept of a blue/green deployment is to create two identical production environments (blue and green) that work in parallel. At any given time, only one of these production environments is live. The blue environment, for example, receives all user traffic, while the clone (green) remains idle.
What is the blue-green deployment pattern safe?
A blue-green deployment is an application release strategy for safely updating apps in production with no downtime. This deployment process involves creating two identical instances of a production app behind a load balancer.
Why is it called blue-green?
They finally settled on using colors instead, which didn’t have a natural order. Thus, they planned names like blue, green, or orange (they avoided red because it implied danger). In the end, it turned out they only needed two environments. And so the term blue-green was coined.
How do I deploy changes without downtime?
Zero downtime deployment is a deployment method where your website or application is never down or in an unstable state during the deployment process. To achieve this the web server doesn’t start serving the changed code until the entire deployment process is complete.
When to use blue green deployment with single database?
Blue-Green Deployment With a Single Database. Bozho June 23, 2015. A blue-green deployment is a way to have incremental updates to your production stack without downtime and without any complexity for properly handling rolling updates (including the rollback functionality)
Why are blue and green deployments good for Kubernetes?
One of them is a blue-green deployment. In this approach, you maintain two copies of your production environment: blue and green. As a result, this technique reduces risk and minimizes downtime. Also, it perfectly fits in the database schema and the application model change process.
What are the downsides of blue green deployment?
Once production traffic is fully transferred from blue to green, blue can standy in case of rollback or pulled from production and updated to become the template upon which the next update is made. There are downsides to this continuous deployment model.
Is it possible to switch from green to blue database?
There are several advantages to this approach. Rollbacks are just a matter of switching from Blue to Green or Green to Blue. When switchovers occur, they are seamless because the code has already been running, and there is no need to wait for it to compile or warm-up.