I work an old Zend App running in two nations that runs on a cheap VM. It's scales far beyond the market and makes real money. We have docker now but that is o

I work an old Zend App running in two nations that runs on a cheap VM. It's scales far beyond the market and makes real money. We have docker now but that is only to manage legacy dependencies. You don't always need complex infrastructure for scale. Getting your indexes correct, keeping the number of calls to the db low, and tuning your db can do magic.