The Docker scripts are now managed as part of the main IPT project; https://github.com/gbif/ipt
A Docker image for the GBIF IPT. Tomcat is exposed on port 8080 and the IPT runs as the ROOT application.
The image builds upon the Docker community Tomcat 8.5 / OpenJDK 8 / Debian stable image.
We regulary publish IPT releases as Docker images to Docker Hub: https://hub.docker.com/r/gbif/ipt/