1: Containers from 30,000 feet
Containers are definitely a thing.
In this chapter we’ll get into things like; why we have containers, what they do for us, and where we can use them.
The bad old days
Applications are at the heart of businesses. If applications break, businesses break. Sometimes they even go bust. These statements get truer every day!
Most applications run on servers. In the past we could only run one application per server. The open-systems world of Windows and Linux just didn’t have the technologies to safely and securely run multiple applications on the same server.
As a result, the story went something like this… Every time the business needed a new application, the IT department would buy a new server. Most of the time nobody knew the performance requirements of the new application, forcing the IT department to make guesses when choosing the model and size of the server to buy.
As a result, IT did the only thing it could do — it bought...
