  Linux Containers, such as those managed by Docker, are an increasingly
popular way to package and deploy complex applications. However, the
fundamental security primitive of network access control for a distributed
microservice deployment is often ignored or left to the network operations
team. High-level application-specific security requirements are not
appropriately enforced by low-level network access control lists. Apart from
coarse-grained separation of virtual networks, Docker neither supports the
application developer to specify nor the network operators to enforce
fine-grained network access control between containers.
  In a fictional story, we follow DevOp engineer Alice through the lifecycle of
a web application. From the initial design and software engineering through
network operations and automation, we show the task expected of Alice and
propose tool-support to help. As a full-stack DevOp, Alice is involved in
high-level design decisions as well as low-level network troubleshooting.
Focusing on network access control, we demonstrate shortcomings in today's
policy management and sketch a tool-supported solution. We survey related
academic work and show that many existing tools fail to bridge between the
different levels of abstractions a full-stack engineer is operating on.
  Our toolset is formally verified using Isabell/HOL and is available as Open
Source.
