What does it take to run applications?

• Lets consider bookmy show as an application example
  
• To run the application as we have observed in the class, we require
  • some operating system
  • necessary softwares to be installed (java)
  • Software package to be downloaded (spring petclinic)
  • network: ipaddress and port
  • cpu, ram and disk

Lets see what a container offers

• Inside the container also,
  • we have an os
  • network
  • cpu/ram/storage
  • necessary softwares
  • we downloaded package
  • we executed application.
• As we discussed, containers can be scaled (increased)
• If we can rethink of application as multiple individually runnable services rather than a ntier (or monolith)
  
• We can scale the necesary components which can reduce costs
• We can individually update the necessary components without impacting the whole application
• By the way this approach is technically referred as micro-services.