Setup DevOps for an ROR application (with 2.5M MAU)

----- GOAL ----- >> To set up the production deployment process as per specifications from the engineering team. >> To train the engineering team on the above and create a troubleshooting document for handling common issues expected in the deployment process and stability. ----- OUR CURRENT SETUP ----- We are currently hosted on Amazon AWS & use the following services: Production Server: [login to view URL], with Nginx + Rails Application (Puma app server) Database: RDS - [login to view URL] We use other services like >> S3 + Cloudfront and Cloudflare for content >> Redis (on the Server) for Sidekiq our background worker >> Multiple WordPress instances hosted on AWS Lightsail, exposed as a subpath via nginx. Staging >> Server: [login to view URL], with Nginx + Rails Application (Puma app server) + Redis >> Database: On the same [login to view URL], mysql installation Ours is a Ruby on Rails based application. We use Capistrano for deployment. Currently we have 3 recipes for server setup - for production, staging and development. ----- REQUIRED SETUP ----- Production environment on AWS 2 Servers - one dedicated for web requests and second for background tasks >> Server 1 - Rails Application, as web server (Puma) >> Server 2 - Redis + Rails Application, as worker server >> This Redis instance must be accessible from both servers as Server 1 will call it to queue tasks, If required this Redis can be exported to a separate instance. >> Provisioning a load balancer for the same >> Providing the associated Capistrano recipes for deployment >> Helping in migration to new layout without any downtime and any issues will HTTPS/SSL, Domain mapping >> Enabling HTTPS/SSL on the AWS Lightsail, wordpress instances and properly exposing them as a sub path >> Staging would work as it is, no change required >> Having a history with Rails applications would be beneficial