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Cool Things About Docker

Theo Pak
September 30, 2015

Cool Things About Docker

Theo Pak

Cimpress Infrastructure Core Engineering Lightning Talk: Wed Sept 30, 2015 @ 10:30am in Waltham, MA.

Theo Pak

September 30, 2015

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  1. Cool Things About Docker
    Theo Pak

    [email protected]


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  2. Linux Containers
    • A container is an isolated, 

    resource controlled, portable environment 

    for your application

    • Containers are lightweight

    • Microservices ❤ Containers

    • Linux containers prd ready on Docker 1.5

    • Windows containers coming in 

    Windows Server 2016

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  3. Virtual Machines Containers
    Code that describes entire
    Code that describes the
    application environment.

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  4. Containers
    Containers are perfect for

    - faster deployments

    - near zero startup penalty

    - highly automatable

    - resource, network,
    content isolation

    - dependency isolation
    Code that describes the
    application environment.

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  5. Build an Image
    Infrastructure as code: Containers are 

    your exact environment (but not a whole VM).

    $ git add Dockerfile

    $ git commit -m “Dev and Ops run the same Dockerfile”

    A Dockerfile defines a container image. 

    Images layer additively.

    $ cat Dockerfile

    FROM ubuntu

    RUN apt-get -y install ruby ruby-dev sensu

    COPY ./dist /var/my_app/

    EXPOSE 80

    CMD ["./start.sh"]

    Linux Containers are lightweight and perfect for microservices. 

    Virtually zero added cost to application startup/restart.

    $ docker build # build an image from the Dockerfile

    $ docker run # run an instance of an image

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  7. Run an Image as a Container
    • No different DEV, CIT, PRD environments

    • Exactly one environment: the container

    • The same container runs on 

    your machine, Jenkins, AWS, etc

    • Expect your build to be identical on localhost, Jenkins, and prd.

    • Now, your source repo captures as much as possible about the

    • DevOps people are experts. Use their images as base.

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  8. puppet apply inside a container
    Use Puppet? Consul, Vagrant, Terraform? Auspice?

    You can get some of the benefits of containers in combination
    with complimentary tools.

    COPY puppet /etc/puppet

    RUN cd /etc/puppet \

    && librarian-puppet update

    RUN puppet apply /etc/puppet/manifests/default.pp \

    —-modulepath=‘/etc/puppet/modules' \


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  9. Container-Oriented Design
    • Containers are isolated, resource-controlled, and portable

    • Containers are lightweight: you can run more containers than
    VMs on the same hardware

    • Containers are instances of Images. 

    Images are made of other Images.

    • You can get some of the benefits of containers in combination
    with a configuration managed by Puppet

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  10. Docker
    Build, Ship, Run

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