Intro to Docker

A whirlwind peek into containerization

Transcript

1. INTRO TO DOCKER
   a whirlwind peek into containerization
   Rupak Ganguly | IT Workshop, Atlanta. Oct. 16th, 2018
   

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2. WHAT IS DOCKER?
   An open platform for building, shipping and running distributed
   applications inside containers.
   The platform consists of:
   The Docker Engine: a portable, lightweight runtime and
   packaging tool. It is the CLI that we interact with.
   The Docker Hub: A public/private registry for docker images,
   supporting sharing, and automatic builds.
   If it works on your machine, it will work anywhere.
   ensures repeatability
   removes dependency hell
   promotes portability
   

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3. “
   Annual revenue is expected to increase by
   4x, growing from $749 million in 2016
   to more than $3.4 billion by 2021,
   representing a compound annual growth
   rate (CAGR) of 35 percent.
   - 451 Research
   

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4. DOWN THE MEMORY LANE
   Containers date back to 2000, FreeBSD
   Jails
   Solaris had similar concept called Zones
   Based on OpenVZ and LXC (Linux
   containers)
   Solomon Hykes stared Docker in France
   as an internal project with dotCloud
   Docker was first announced to public at
   PyCon in 2013
   Docker is built on top of LXC & linux kernel
   facilities like cgroups and namespaces.
   Docker v0.9 dropped LXC and replaced it
   with libcontainer library
   

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5. CONTAINERS vs. VMs
   Source: Docker
   

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6. CONTAINERS
   (portable)
   share the linux kernel &
   system/OS resources
   app code isolated and
   sandboxed
   very fast sub sec. startup
   VM HYPERVISORS
   (Hyper-V, KVM, Zen)
   are based on emulating
   virtual hardware
   pack a lot of fat that is
   unnecessary
   slow to start up
   VS
   CONTAINERS vs. VMs
   

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7. CONTAINERIZED APPLICATION
   It’s like sending a zip file of your document and
   image files rather than sending those along with
   OS on your machine.
   VMs include a full guest OS with its own memory management, device
   drivers, etc., while containers just have the app, bins, libs & its
   dependencies.
   Containers run as an isolated process on the host OS, and share the
   kernel with other containers.
   Containers are more portable and efficient than VMs. Containers can run
   on any OS or cloud.
   VMs can use different operating systems or kernels. All containers must
   use the same operating system and kernel.
   

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8. COMPOSING MULTI-SERVICE APPLICATIONS
   # docker-compose.yml
   version: "3"
   services:
   wp:
   image: wordpress
   ports:
   - 8080:80 # host_port:container_port
   environment:
   WORDPRESS_DB_PASSWORD: pass@word01
   WORDPRESS_DB_NAME: wordpress
   depends_on:
   - mysql
   mysql:
   image: mysql:5.5
   environment:
   MYSQL_ROOT_PASSWORD: pass@word01
   ports:
   - 3306:3306
   

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9. ORCHESTRATION
   Develop multi-container applications locally with either Docker
   Swarm or Kubernetes and run them in production
   Use Docker Compose to compose full multi-service applications
   

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10. DEMO
    Simple linux shell (busybox)
    Dev environments (ruby,nodejs,python)
    Single container application (hello-world)
    Multi-container application (wordpress + mysql db)
    

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11. END-TO-END WORKFLOW
    

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12. USE CASES
    Developer Productivity:
    Maintain multiple development environments on the host machine - Ruby,
    Python, Go, Node.js. Isolates environment without polluting the host machine
    Build & test composable, multi-microservices based applications locally.
    Shareability: Shared images via container public/private registries - DockerHub,
    Quay, AWS ECR
    Code Pipeline Management: Disposable build environments for CI/CD pipelines:
    CircleCI, Codeship, GitLab, Codefresh, TeamCity, Jenkins, TravisCI, GoCD, Docker
    Enterprise Edition
    Simplified Configuration Management decouples infrastructure requirements
    from application environment
    Rapid Deployment: Repeatable, identical environments - dev, stage, test and
    production
    App Isolation: Immutable, layered, version-tracked, reusable container images -
    run multiple versions of same software
    Multi-tenancy: Easy and inexpensive to create isolated environments for running
    multiple instances of app tiers for each tenant
    Infrastructure Consolidation & Cost Savings: Docker provides far denser server
    consolidation than you can get with VMs.
    

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13. CONTAINER PLATFORMS
    Docker Enterprise
    Amazon ECS & EKS, Google K8s Engine (GKE), Azure Container
    Service (ACS) & K8s Service (AKS)
    RedHat OpenShift
    CoreOS Tectonic
    Mesosphere
    Cloud Foundry
    Joyent Triton
    

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14. QUESTIONS?
    @rupakg
    rupakganguly.com
    

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