Docker can be used to easily develop and deploy Pharo applications. The pharo-vnc-supervisor image provides a containerized environment for Pharo with VNC and web browser access. The save-pharo command allows customizing a Pharo image within a container, such as installing projects. A Dockerfile can define a new image based on pharo-vnc-supervisor with a customized Pharo home and startup scripts. Dockerizing Pharo makes application development and deployment more portable and shareable.

1. Dockerizing
Pharo
Develop & Deploy Pharo with Docker
111th #st_study @ Tokyo
2018 Masashi Umezawa
SoftUmeYa, LLC

2. Docker?
● Container-based virtualization platform
○ Lightweight
○ Programmable
○ Sharable
■ https://hub.docker.com/
● Docker container is like Smalltalk image
○ Universal
○ Self-contained
● With Docker, you can develop/deploy Pharo
applications more easily

4. pharo-vnc-supervisor
● pharo-vnc-supervisor
○ Supports Pharo 5, 6 & 7
○ Debuggable via VNC and Web Browser
○ Daemonized with supervisord
○ Web browser installed (Chromium, Firefox)
○ Inspired by SORABITO in-house Pharo docker image
○ Easily customizable
● teapot-pharo-vnc-supervisor
○ Example of pharo-vnc-supervisor customization
○ Runs Teapot on startup

5. Run a container
● Run Pharo with VNC ports opened
docker run --name my_pharo -d -p 5901:5901 -p 6901:6901
mumez/pharo-vnc-supervisor
● VNC Client
○ yourhost:5901
● Web Browser
○ http://yourhost:6901/?password=vncpassword
○ For Pharo 7, specify pharo70 tag mumez/pharo-vnc-
supervisor:pharo70

6. Build a customized Pharo image
● Use save-pharo <command> <args>
docker run --rm -p 5901:5901 -p 6901:6901 ¥
-v=$HOME/teapot:/root/data ¥
mumez/pharo-vnc-supervisor ¥
save-pharo get Teapot
○ You can save Pharo image on a mounted volume
○ Pharo image will be built by a temporary container
○ Teapot installed image will be saved in $HOME/teapot
and can be used later

7. save-pharo options
● get <Project name>
○ Install a project on Catalog Browser
● config <URL> <Configuration name> --
install=<version>
○ Install via ConfigurationOfXXX
● metacello <metacello arguments>
○ Install via BaseLineOfXXX
○ Only available on Pharo 7 based container

8. Run with a customized Pharo image
● Just mount an exsiting volume with -v option
docker run -p 5901:5901 -p 6901:6901 ¥
-v=$HOME/teapot:/root/data ¥
mumez/pharo-vnc-supervisor
○ Pharo image can be persisted as usual
○ Use -e PHARO_IMAGE=<image_file_name>
to specify Pharo image name

9. How to build your Docker image
● Prepare a Dockerfile (example: teapot-pharo-vnc-supervisor)
FROM mumez/pharo-vnc-supervisor
LABEL maintainer="Masashi Umezawa <ume@softumeya.com>"
ARG TEAPOT_DIR=/root/teapot
RUN setup.sh && ¥
save-pharo.sh get Teapot && ¥
cp -r /root/data ${TEAPOT_DIR}
ENV PHARO_HOME=${TEAPOT_DIR}
VOLUME [ "${TEAPOT_DIR}" ]
Define a new pharo image root
Copy the saved image to a new
root
Install libs / apps by save-pharo.sh
Set PHARO_HOME to the new root

10. Customizing startup scripts
● If you add xxx.st to $PHARO_HOME/config, it will be
called on Pharo startup
ADD ./config/startup.st ${PHARO_HOME}/config/
● In teapot-pharo-vnc-supervisor startup.st:
teapot := Teapot configure: {#port -> 9000}.
teapot
GET: '/cat/<a>/<b>' -> [:req | (req at: #a) , ' is ' , (req at: #b)];
start.

11. Auto-build your Docker image
● Publish your Dockerfile (and st sources) to GitHub
● Register the repository as a “automated build” in
DockerHub
● If you commit something, a new image will be built

12. Summing up
● “pharo-vnc-supervisor” provides a handy environment for
web application development with Pharo
● By “save-pharo” command, you can build a new Pharo
image by command line
● A new Docker image having a customized Pharo image
can be easily created with a simple Dockerfile
● Enjoy Dockernzing Pharo!