It's great for those nasty legacy apps that only work on old unmaintained versions of Rails or old OS Versions etc. Take all the nastiness and throw it into a

It's great for those nasty legacy apps that only work on old unmaintained versions of Rails or old OS Versions etc. Take all the nastiness and throw it into a box, without needing to contact Ops to reserve memory and provision a VM. IMO, it's one of the major reasons why Enterprises get so excited about Docker. Legacy app dependency issues are horrible once you get past a certain scale. VM's are expensive and non-self-service at most orgs since they tie up RAM and licenses.