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Canary deployment strategy also known as blue/green deployment, is an industry standard protocol for deployment with zero downtime by utilizing two separate environments and switching during source code updates or rollbacks. Canary deployments have a lot of advantages when it comes to multi-server configuration and aids in technical cases like version rollbacks, and a/b testing.
This blogpost describes two ways to speed up building your Docker images: caching build info remotely and using the new link option when copying files