Phusion blog Subscribe Scroll Down 20 January 2015 on baseimage-docker , docker , featured When building Docker containers, you should be aware of the PID 1 zombie reaping problem. That problem can cause unexpected and obscure-looking issues when you least expect it. This article explains the PID 1 problem, explains how you can solve it, and presents a pre-built solution that you can use: Baseimage-docker. When done, you may want to read part 2: Baseimage-docker, fat containers and "treating containers as VMs" . About a year ago -- back in the Docker 0.6 days -- we first introduced Baseimage-docker . This is a minimal Ubuntu base image that is modified for Docker-friendliness. Other people can pull Baseimage-docker from the Docker Registry and use it as a base image for their own images. We were early adopters of Docker, using Docker for continuous integratio...