Zero downtime deployment
A zero downtime deployment strategy allows teams to deploy new application versions without any outages. There is seamless cutover without manual intervention, and new features are released quickly without any additional service requests to open firewalls, configure load balancers, and so on.
Cloud Foundry offers a mechanism to perform zero downtime deployments of applications by manipulating the routes between the deployed application version and the new application version.
Any application deployed in Cloud Foundry will have a minimum of two routes: an external route and an internal route. Only the external route is exposed to end users, and this is the only way all the user requests will be served by the application. ...
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