Presentation at SouthEast Linux Fest 2015 about the advantages of introducing Docker into CI/CD pipelines for Agile Linux Development.

1. Michael Solberg
Chief Field Architect
June 14, 2015
Streamlining Agile Linux
Development with Docker

2. 2
AGENDA
Continuous Integration/Delivery
Traditional Pipeline
Docker Overview
Docker Pipeline

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Continuous Integration
Continuous Delivery

4. 4
Test before you push
Syntax, Workflow, Unit Tests
Test after you push
Reproducibility, Build Environments, Unit Tests
Test before you deploy
Integration Tests, Performance Tests, Merge Tests
Continuous Integration
Did I just break something?

5. 5
Code moves through a set of manual and automated gates in a feature branch
before being committed to the master branch.
Example CI Pipeline
used by OpenStack Nova project

6. 6
Installs Django library, validates data models, and runs unit tests.
Example Jenkins Build Script
for Django application
/usr/bin/virtualenv venv
source venv/bin/activate
pip install -r requirements.txt
python manage.py validate
python manage.py syncdb --noinput
python manage.py test

7. 7
Package the code
Prepare the code for distribution
Deploy the package
Push the package to the production environment
Test the deployment in production
QA the deployed application
Continuous Delivery
It works - deploy it for me.

8. 8
Example Jenkins Deploy Process
for 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

9. 9
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 Rollout
for Django application behind load balancer

10. Why Docker?

11. 11
Consistent Delivery Format
No wars, jars, ears, tars, or RPMs.
Consistent Packaging Definition
Dockerfiles are stored alongside code and are human
readable
Built-in Deployment Infrastructure
Docker Registries simplify application deployment
Introducing Docker
Docker simplifies the delivery pipeline

12. 12
Application Stack by Format
for Django application

13. 13
Application Stack by Organization
for Django application

14. 14
Application Stack with Docker
for Django application

15. 15
Example Jenkins Deploy Process
for 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

16. 16
In the docker deployment model, all servers run both the latest build and production
build during UAT.
Production Rollout with Docker
for Django application behind load balancer

17. For more information on Docker in RHEL:
http://red.ht/1Gk9w62
RH_PREStemp_light_v1_0324

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