From a DevOps point of view, the importance of a well-architected solution, with proper separation of responsibilities, is fundamental for the long-term success of any application. This case we are presenting today is a very simplified example made to showcase the concept and to be easily understood, but it sets the base to scale it on your own as you gain confidence on this topic. We will make use of Elastic Compute Service (ECS), Server Load Balancer (SLB) and Virtual Private Cloud (VPC), all very common Alibaba Cloud services that you should be familiar with.
Containers and Running Services
When using Docker, like in our case today, one should never run more than one function per container. Running more than one defeats the whole purpose of using containers, as adding them doesn't cost much in terms of resources. In my experience, as DevOps lead engineer, I saw too many projects made by others with supervisord managing multiple functions in a single container. This is considered an anti-pattern as makes it very hard to track, debug and scale them horizontally. Please notice that I'm using the word function, not process. The official Docker documentation has moved away from saying one "process" to instead recommending one "concern" or "function" per container.