Docker Essentials For Python Developers

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DOCKER ESSENTIALS FOR PYTHON DEVELOPERS Vuyisile Ndlovu DevOps Specialist @terrameijar

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Vuyisile Ndlovu @terrameijar vuyisile.com @terrameijar

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Links to Slides and more vuyisile.com/pyconzim2024

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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

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DOCKER IS. . . @terrameijar | vuyisile.com/pyconzim24

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DOCKER CONTAINERS vs VIRTUAL MACHINES

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WHY DOCKER?

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Without Docker ● Setting up environments hard ● Dependency problems in different OSes ● Difﬁcult for teams not familiar with your stack @terrameijar | vuyisile.com/pyconzim24

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DOCKER: CORE CONCEPTS

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Docker Images: templates used to create containers @terrameijar | vuyisile.com/pyconzim24

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Images are like . . .

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@terrameijar | vuyisile.com/pyconzim24 - Cake Premix contains: - Baking instructions - Ingredients to bake a cake - Produces consistent and predictable results CAKE PREMIX

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Docker Containers: running instances of Images @terrameijar | vuyisile.com/pyconzim24

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Containers are like . . .

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@terrameijar | vuyisile.com/pyconzim24

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Dockerﬁle: Instructions for building Docker Images @terrameijar | vuyisile.com/pyconzim24

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Dockerﬁle example

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Docker Hub: Website for sharing Docker Images @terrameijar | vuyisile.com/pyconzim24

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Docker Compose: Tool for deﬁning and running multi container applications @terrameijar | vuyisile.com/pyconzim24

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Docker Volume: Persistent storage for containers @terrameijar | vuyisile.com/pyconzim24

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Docker Networks: Enable communication between containers (and other services) @terrameijar | vuyisile.com/pyconzim24

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Common Docker Commands

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docker image build ● Builds a Docker image based on a Dockerﬁle @terrameijar | vuyisile.com/pyconzim24

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docker container run ● Convert an image into a container and start it @terrameijar | vuyisile.com/pyconzim24

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docker container stop ● Stops running containers @terrameijar | vuyisile.com/pyconzim24

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docker volume create ● Create a Docker Volume @terrameijar | vuyisile.com/pyconzim24

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DEMO: Dockerising a Python application

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@terrameijar | vuyisile.com/pyconzim24

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@terrameijar | vuyisile.com/pyconzim24

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SIMPLE FLASK APPLICATION @terrameijar | vuyisile.com/pyconzim24

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Complex Flask application

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@terrameijar | vuyisile.com/pyconzim24

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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"]

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THANK YOU! @terrameijar | vuyisile.com/pyconzim24