For zero downtime deployment, how many IP addresses does each worker in CloudHub require?

For zero downtime deployment in CloudHub, each worker requires one additional IP address. This is essential to facilitate the seamless transition from the current version of an application to a new version without interrupting the service for users. By assigning an additional IP address, the application can route traffic to both the old and new versions effectively during the deployment process.

This approach allows for a controlled rollout where the existing traffic can still access the current application while new traffic can be directed to the new version. After verification that the new version is running correctly, the old version can be safely decommissioned without impacting users, ensuring the continuity of service. This is a standard practice in cloud deployment environments aiming for high availability and minimal disruption.