Docker for .NET Developers 2018 (60 min)

Slides from the 60 minute version of my Docker for .NET Developers talk.

Transcript

1. Technology that unlocks the value
   of your professional audience
   Docker for .NET Developers
   Steve Gordon - Senior Software Developer
   Madgex Ltd
   @stevejgordon | stevejgordon.co.uk
   youtube.stevejgordon.co.uk
   https://www.meetup.com/dotnetsoutheast
   

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2. Technology that unlocks the value
   of your professional audience
   What we’ll cover
   • Our journey To Docker
   • Why use Docker?
   • What is Docker?
   • dockerfiles and docker-compose
   • Using Jenkins for builds
   • Running containers on AWS ECS
   

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3. Technology that unlocks the value
   of your professional audience
   What is Docker?
   • Containerisation and application platform
   • Offers frictionless development and deployment
   • An image is a template for a container
   • Images are lightweight, standalone packages for an application
   • A container is a running instance of an image
   • A host is a physical or virtual machine on which you will run
   containers (running the Docker Engine)
   

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4. Technology that unlocks the value
   of your professional audience
   Lightweight
   Significantly smaller resource
   footprint
   Small unit of deployment
   Smaller file size
   Containers vs. Virtual Machines
   PHYSICAL HOST
   HOST OS
   DOCKER ENGINE
   BINS / LIBS
   APP A
   BINS / LIBS
   APP C
   BINS / LIBS
   APP B
   Reliability
   Trust that what worked locally
   will work in production
   Fast start-up
   Can start in under 1 second
   PHYSICAL HOST
   HOST OS
   HYPERVISOR
   GUEST OS GUEST OS
   BINS / LIBS
   BINS / LIBS
   APP
   B
   APP A
   APP
   C
   

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5. Technology that unlocks the value
   of your professional audience
   Microservice based
   Single responsibility
   Discrete scaling
   Independent releases
   .NET Core & ASP.NET Core
   Cross platform
   Improved performance
   API driven SPA
   Backend ASP.NET Core APIs
   Madgex Insights
   

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6. Technology that unlocks the value
   of your professional audience
   Insights Architecture
   FRONT END SPA
   USER API SCHEDULE API
   REPORT API
   QUERY API
   ELASTICSEARCH
   

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7. Technology that unlocks the value
   of your professional audience
   Developer Workflow
   PULL
   CLIENT PROJECT
   PULL
   PLATFORM
   BUILD x2
   EDIT
   DOCKER-COMPOSE PULL
   EDIT
   DOCKER-COMPOSE UP
   

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8. Technology that unlocks the value
   of your professional audience
   “This is amazing!”
   James Wragg (Senior Front End Developer at Madgex)
   

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9. Technology that unlocks the value
   of your professional audience
   Developing with Docker
   On Windows
   • Docker for Windows (Win 10 Pro)
   • Docker Toolbox (Win 7 / Win 8 / Win 10
   Home)
   On Mac
   • Docker for Mac (OS X El Capitan 10.11 or
   newer)
   • Docker Toolbox
   Visual Studio
   • Visual Studio Tools for Docker
   VS Code
   • Install the vscode-docker
   extension
   

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10. Technology that unlocks the value
    of your professional audience
    Demo
    dockerfiles
    Building and running an image
    

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11. Technology that unlocks the value
    of your professional audience
    Anatomy of an image – ASP.NET Core 2.0 Build Image
    FILE SYSTEM – DEBIAN STRETCH - debian:stretch (45MB)
    DEPENDENCIES (PACKAGES) – CURL - buildpack-deps:stretch-curl (61MB)
    DEPENDENCIES (PACKAGES) – SCM - buildpack-deps:stretch-scm (111MB)
    .NET CORE SDK AND CLI - microsoft/dotnet:2.0.6-sdk-2.1.104-stretch (580MB)
    ASP.NET CORE NUGET PACKAGE CACHE - microsoft/aspnetcore-build:2.0 (699MB)
    YOUR ASP.NET APPLICATION
    SCRATCH
    

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12. Technology that unlocks the value
    of your professional audience
    Naming and Tagging Images
    registry-prefix/name:tag
    • We can optionally name and tag images during build using –t or --tag
    • Image names can contain lowercase letters, digits and separators
    • Image names can be optionally prefixed with a registry hostname
    • A tag can be used to specify a “version” of an image e.g. myservice:1.02
    • You can tag a pre-existing image using the docker image tag command
    

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13. Technology that unlocks the value
    of your professional audience
    Images pushed to a
    registry
    Store for images
    Docker Registries
    Images pulled from a
    registry
    REGISTRY
    123456789012.dkr.ecr.eu-west-2.amazonaws.com
    docker push 123456789012.dkr.ecr.eu-west-2.amazonaws.com/myimage:1.1
    docker pull123456789012.dkr.ecr.eu-west-2.amazonaws.com/myimage:1.1
    

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14. Technology that unlocks the value
    of your professional audience
    Demo
    docker-compose
    Build and run multiple images
    

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15. Technology that unlocks the value
    of your professional audience
    Docker in Production
    AWS ECR
    AWS ECS
    PRODUCTION
    

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16. Technology that unlocks the value
    of your professional audience
    Orchestration
    • Tool(s) to assist with the management of multiple containers
    • Automated deployment with rollback support
    • Scaling
    • Health monitoring and healing of failed containers
    • Service discovery
    • Load balancing
    • Configuration management
    

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17. Technology that unlocks the value
    of your professional audience
    Amazon ECS
    Services
    Manage how tasks run and scale.
    ALB
    CLUSTER
    EC2 INSTANCE ECS AGENT
    TASK A TASK B
    EC2 INSTANCE ECS AGENT
    TASK A TASK B TASK B
    SERVICE A
    Desired Count = 2
    Task Def = Task Def A
    SERVICE B
    Desired Count = 4
    Task Def = Task Def B
    Task Definition
    A recipe to execute your application
    TASK B
    ECS is a Managed Service
    No patching or maintenance
    Cluster
    Logical grouping of EC2 instances
    ALB
    ALB with path routing to multiple services
    Task
    A running instance of a task definition
    

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18. Technology that unlocks the value
    of your professional audience
    Demo
    Deploying to AWS ECS
    using Docker and
    Jenkins
    

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19. Technology that unlocks the value
    of your professional audience
    Zero Downtime Deployments
    CLUSTER
    EC2 INSTANCE
    TASK A
    ServiceA : v2
    EC2 INSTANCE
    TASK A
    ServiceA : v3
    SERVICE A
    Desired Count = 1
    Task Def = Task Definition A
    TASK DEFINITION A
    Task Definition A : 3
    Task Definition A : 2
    Task Definition A : 1
    ECR
    ServiceA : v1 ServiceA : v2 ServiceA : v3
    

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20. Technology that unlocks the value
    of your professional audience
    Challenges and lessons learnt
    • There is a learning curve… but it's shallow at first
    • Start with basic dockerfiles – enhance in stages
    • Get started just by using a pre-built image e.g. Postgres
    • Amazon ECS a little complex
    • Use CloudFormation to define ECS environments
    • Vendor Lock
    • Logging
    • Placement of containers – Balance memory/memory reservation
    

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21. Technology that unlocks the value
    of your professional audience
    Benefits
    • Improved developer productivity and reduced onboarding time
    • No more "it runs on my machine" arguments
    • Dependable deployments
    • Simple build and deploy process
    • Zero downtime, fast, continuous deployments
    • Lower costs
    

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22. Technology that unlocks the value
    of your professional audience
    Thank you
    @stevejgordon | stevejgordon.co.uk
    https://www.meetup.com/dotnetsoutheast
    

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