Michael SolbergChief Field ArchitectJune 14, 2015

Streamlining Agile Linux Development with Docker

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AGENDA

Continuous Integration/Delivery

Traditional Pipeline

Docker Overview

Docker Pipeline

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Continuous IntegrationContinuous Delivery

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Test before you pushSyntax, Workflow, Unit Tests

Test after you pushReproducibility, Build Environments, Unit Tests

Test before you deployIntegration Tests, Performance Tests, Merge Tests

Continuous IntegrationDid I just break something?

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Code moves through a set of manual and automated gates in a feature branch before being committed to the master branch.

Example CI Pipelineused by OpenStack Nova project

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Installs Django library, validates data models, and runs unit tests.

Example Jenkins Build Scriptfor Django application

/usr/bin/virtualenv venvsource venv/bin/activatepip install -r requirements.txtpython manage.py validatepython manage.py syncdb --noinputpython manage.py test

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Package the codePrepare the code for distribution

Deploy the packagePush the package to the production environment

Test the deployment in productionQA the deployed application

Continuous DeliveryIt works - deploy it for me.

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Example Jenkins Deploy Processfor Django application

● Package the application (either pypi or RPM)– rpmbuild -bb build/package.spec

● Push the package to an application repository– scp build/*.rpm yum@repo

● Pull the package down to an integration environment– ssh host yum -y update

● Restart services on the integration environment– ssh host service httpd restart

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In the traditional deployment model, a subset of servers are updated with the latest build and put through UAT. Then the load balancer cuts over the new build.

Production Rolloutfor Django application behind load balancer

Why Docker?

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Consistent Delivery Format No wars, jars, ears, tars, or RPMs.

Consistent Packaging DefinitionDockerfiles are stored alongside code and are human readable

Built-in Deployment InfrastructureDocker Registries simplify application deployment

Introducing DockerDocker simplifies the delivery pipeline

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Application Stack by Formatfor Django application

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Application Stack by Organizationfor Django application

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Application Stack with Dockerfor Django application

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Example Jenkins Deploy Processfor Django application with Docker

● Copy the source into a new Docker image– ADD . /webapps/polls/

● Build the new Docker image– docker build -t rhel6-django16-polls .

● Tag the Docker image– docker tag rhel6-django16-polls:$BUILD_NUMBER

● Push the image to the registry– docker push ...

● Run the new image alongside the existing image

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In the docker deployment model, all servers run both the latest build and production build during UAT.

Production Rollout with Dockerfor Django application behind load balancer

For more information on Docker in RHEL:http://red.ht/1Gk9w62

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