Docker Essentials For Python Developers

Docker and containerisation can be confusing technologies if you haven't spent much time in the containerization and virtualisation space. This talk covers core Docker concepts such as images, containers, and Dockerfiles.

It presents a simple and easy-to-follow introduction to Docker and shows how to apply the concepts to Dockerise Python applications.

Transcript

1. DOCKER ESSENTIALS FOR PYTHON DEVELOPERS Vuyisile Ndlovu DevOps Specialist @terrameijar
2. Vuyisile Ndlovu @terrameijar vuyisile.com @terrameijar
3. Links to Slides and more vuyisile.com/pyconzim2024
4. TODAY, YOU’LL LEARN • What Docker is • Why we need it • Core Docker concepts • Practical Demo: Dockerising a Python application • Building and running a Docker container • Tips and best practices for running containers
5. DOCKER IS. . . @terrameijar | vuyisile.com/pyconzim24
6. DOCKER CONTAINERS vs VIRTUAL MACHINES
7. WHY DOCKER?
8. Without Docker • Setting up environments hard • Dependency problems in different OSes • Difficult for teams not familiar with your stack @terrameijar | vuyisile.com/pyconzim24
9. DOCKER: CORE CONCEPTS
10. Docker Images: templates used to create containers @terrameijar | vuyisile.com/pyconzim24
11. Images are like . . .
12. @terrameijar | vuyisile.com/pyconzim24 - Cake Premix contains: - Baking instructions - Ingredients to bake a cake - Produces consistent and predictable results CAKE PREMIX
13. Docker Containers: running instances of Images @terrameijar | vuyisile.com/pyconzim24
14. Containers are like . . .
15. @terrameijar | vuyisile.com/pyconzim24
16. Dockerfile: Instructions for building Docker Images @terrameijar | vuyisile.com/pyconzim24
17. Dockerfile example
19. Docker Hub: Website for sharing Docker Images @terrameijar | vuyisile.com/pyconzim24
20. Docker Compose: Tool for defining and running multi container applications @terrameijar | vuyisile.com/pyconzim24
22. Docker Volume: Persistent storage for containers @terrameijar | vuyisile.com/pyconzim24
23. Docker Networks: Enable communication between containers (and other services) @terrameijar | vuyisile.com/pyconzim24
24. Common Docker Commands
25. docker image build • Builds a Docker image based on a Dockerfile @terrameijar | vuyisile.com/pyconzim24
26. docker container run • Convert an image into a container and start it @terrameijar | vuyisile.com/pyconzim24
27. docker container stop • Stops running containers @terrameijar | vuyisile.com/pyconzim24
28. docker volume create • Create a Docker Volume @terrameijar | vuyisile.com/pyconzim24
29. DEMO: Dockerising a Python application
30. @terrameijar | vuyisile.com/pyconzim24
31. @terrameijar | vuyisile.com/pyconzim24
32. SIMPLE FLASK APPLICATION @terrameijar | vuyisile.com/pyconzim24
33. Complex Flask application
34. @terrameijar | vuyisile.com/pyconzim24
37. Docker Best Practices @terrameijar | vuyisile.com/pyconzim24 1. Multi stage builds 2. Use small Docker Base Images 3. Use unprivileged containers 4. Prefer exec form over shell form for running CMD, ENTRYPOINT i.e CMD ["--host", "0.0.0.0", "--port", "8001"]
38. THANK YOU! @terrameijar | vuyisile.com/pyconzim24