Chapter 1

1. Correct answers are: 4, 5.
2. A Docker container is, to IT, what a shipping container is to the transportation industry. It defines a standard on how to package goods. In this case, goods are the application(s) developers write. The suppliers (in this case, the developers) are responsible for packaging the goods into the container and making sure everything fits as expected. Once the goods are packaged into a container, it can be shipped. Since it is a standard container, the shippers can standardize their means of transportation such as lorries, trains, or ships. The shipper doesn't really care what's in a container. Also, the loading and unloading process from one transportation means to another (for example, train to ship) can be highly standardized. This massively increases the efficiency of transportation. Analogous to this is an operations engineer in IT...