Microservice is the most popular topic for about 3~5 years. Containerize your services is the main approach to orchestra your microservice. In the past, developer/tester uses virtual machine to develop and test their product. When container technology comes out, all of them jump into it to expedite the whole development circle. So right now, are you curious about what container is? What's the different between virtual machine? Why so popular? How to use it and is there any security issue about it. This talk will provide the basic concept of container and some security concern regarding it and also show you how to use Shodan to search the vulnerable host/container !!!