Thinking in Environments with Docker

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Google Cloud Study Jam • Lahore, 2025 Supercharging Development (Abridged) Thinking in Environments w/ Docker

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Systems architect & technology advisor for startups and enterprises. Find me online @sheharyarn Sheharyar Naseer

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Background • Indie Nomad Software Architect • 14+ years of polyglot experience, focus on Web & Cloud • Worked with Apple, Superlist, AllocatorOne, TheScore, Slab, etc. • StackOverflow: 75,000+ score (Top 5 in Pakistan) • Author / Contributor of multiple famous libraries & tools • Featured on popular developer communities

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Outline Scaling Systems Packaging Environments Docker: What, Why & How Learning Resources Q&A

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Scaling Systems THE CHALLENGE

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Scaling Systems • Processes need to mature with the Software • More complexity requires more moving parts • Different aspects: • Automating Processes • Expanding Infrastructure • Improving Development

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Automating Processes • Tasks increase and grow complex • Reduce manual intervention • Automate common steps • PeopleOps, DevOps, SecOps, DataOps, MLOps • Consistency

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Expanding Infrastructure • Track and manage growing infra • Increase performance • Add more components or features • Configure more tooling & hardware • Keep systems secure & working • Consistent and reliable behaviour

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Improving Development • Onboarding developers faster • Consistent development environments • Multiple devs working on the same codebase • "But works on my machine!" • Reproducible issues • Focus on development

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Packaging Environments WITH VMS & CONTAINERS

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Packaging Environments • Think about "environment" of your system • Reduce to bare essentials • Combine together & isolate from the rest • Two approaches: • Virtual Machines (VMs) • Containers

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Thinking in Environments Development Build

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Thinking in Environments Development Testing Build Staging Production

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Technology Verticals • Web & Mobile • ML / AI • Distributed Systems • Internet of Things • Mixed Reality • Cloud

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Virtualization • Traditional architecture • Emulate Physical Computers • Resource-intensive • Tools: • VMWare • VirtualBox

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Containerization • Modern, cloud-native architecture • Smaller, portable and faster • Efficient and light-weight • Tools: • Docker • Podman

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Host Operating System Hypervisor Guest OS Guest OS Guest OS App App App Runtime Runtime Runtime Host Operating System Container Engine Runtime Runtime App App App vs Virtualization Containerization

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Docker THE WHAT, WHY AND HOW

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Docker is the top-used tool amongst all Professional developers “  StackOverflow Developer Survey 2023  2019 2020 2021 2022 69% 49% 39% 35%

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Docker – The What • "An open-source platform for containerizing applications and environments" • Docker Image: • Set of commands describing how to run your app • Docker Container: • Your commands executed • Can run anywhere

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Docker – The Why • Imagine buying a new computer • You set it up and install apps • Run system updates, etc. • Software: • Repeat steps on every fresh deploy • Manually run updates • Fix broken steps

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Docker – The Why • Ship code faster • Standardize operations • Save money • Simplify security • Run and deploy anywhere

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Docker – The How • Install Docker • Create a "Dockerfile" • Write steps to run app • Run it!

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Example – Python App FROM python:3 # Set the app directory WORKDIR /app COPY . . # Install dependencies RUN pip3 install -r requirements.txt # Start app EXPOSE 5000 CMD ["python3", "-m", "flask", "run", "--host=0.0.0.0"]

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Example – Flutter App FROM fischerscode/flutter:3.22 # Set the development directory WORKDIR /dev COPY . . # Install dependencies RUN flutter pub get # Start app CMD ["flutter", "run"]

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CloudUp.dev • Dockerfile Generator • Maintained by GDG Lahore • Supports common languages • Guided steps https://cloudup.dev/

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Build and Run # Build the image docker build -t my-app:v1 . # Run the app docker run -it -p 5000:5000 my-app:v1 # Run for different envs docker run -it my-app:v1 --env-file stage.env docker run -it my-app:v1 --env-file prod.env

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Running in the Cloud MADE EASY WITH DOCKER

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Supported Tooling • Docker on OS • Container management tools • CI/CD • Serverless

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Infrastructure Providers • Google Cloud Platform • Amazon Web Services • Heroku • DigitalOcean • Fly.io • and many more...

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Save to Google Cloud # Setup gcloud login gcloud config project set ${PROJECT_ID} # Build and Save Image gcloud builds submit \ --tag=gcr.io/${PROJECT_ID}/my-app:v1 .

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Helpful Resources KEEP LEARNING Docker • Official Docs: docs.docker.com • Friendly Guides: vsupalov.com/docker • Dockerfile Generator: cloudup.dev Google Cloud • GCP Container Registry: gcr.io

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Questions?  @  shyr.io hi@shyr.io @sheharyarn These Slides → shyr.io/t/thinking-with-docker Original Slides → shyr.io/t/dev-with-docker More Talks → shyr.io/talks