Docker is an integral part of Flow's technology stack, supporting everything from a developer's local environment to Production containers in AWS. "Workstation" has become central to a developer's toolset at Flow, giving them the ability to bring up/down a service, along with any upstream/downstream dependencies, in a single, simple command implemented with GOlang CLI. For example, developers can run “workstation up --app www” - and reliably have the www app running along with its dozens of transitive dependencies. It truly is reliable - requiring no additional configuration - and just continues to work. The team has recently transitioned to Docker for Mac Beta and just love referencing containers via localhost!

1. “workstation up” -
Docker Development at
Flow
Mike Roth
Principal Engineer
roth@flow.io

2. Flow Commerce
Flow is a next-generation solution for taking
merchants global - more at https://flow.io
We are about to launch and are hiring – email
roth@flow.io if interested

3. “Everything should be
made as simple as
possible, but not simpler.”
— Albert Einstein

4. Flow uses Docker for…
Local development environment (workstation)
https://github.com/flowcommere/workstation
Building custom base images (Play & PostgresQL)
https://github.com/flowcommerce/docker
Continuous Integration (Travis CI)
https://travis-ci.org/flowcommerce/delta
Continuous Delivery (Delta)
https://github.com/flowcommerce/delta
External APIs
https://github.com/flowcommerce/goutils
Production (AWS/ECS)

5. Open Source!
github.com/flowcommerce

6. Right now, let’s make a
change…
in Production

7. Key Stages in Delta
• Syncs GitHub SHAs with master branch
• Syncs tags & applies new one
• Creates/Builds Docker Hub Automated Build
• Scale
**More on CD @ Flow**
http://www.slideshare.net/mbryzek/nyc-continuous-
delivery-meetup-introducing-delta

8. Now, back to Development

9. Docker for Mac
• Simple
• Containers referenced via `localhost`
• Developers install less (e.g. No Virtual Box)

10. CLIs at Flow
Ruby Go
• CLI essentially “baked in”
• Get stuff done - repetitive tasks (e.g. repo tagging,
environment variable updates in S3, check kinesis,
etc.)
• Binaries can be passed around, and they “just work”
• Super useful for non-tech
• Robust

11. Application Dependencies
Flow manages dependencies with Registry
https://github.com/flowcommerce/registry

12. Application Dependencies
• Implement custom health checks (with substance)
• Loosely couple dependencies
• No extends or links needed
• No volumes
• Use S3 for environment variables (in Dev & Prod)

13. External APIs
Docker Hub API
https://github.com/flowcommerce/external-apis/blob/master/
docker/hub.json
Docker Registry
https://github.com/flowcommerce/external-apis/tree/master/
docker
Clients integrated with applications like Workstation and Delta

14. Workstation

15. Sample Process Flow
For example: workstation up —app www
Checks YAML configuration for app details
Recursively checks for upstream dependencies and
maintains priority order (based on their upstream
dependencies)

16. Sample Process Flow (up)
Container
Running?
Get “latest”
from
Docker Hub
docker run
NO
Healthy?
YES
YES
NO

17. Live Demo

18. Let’s Check Prod
and send some Docker love!

19. Thank you!
roth@flow.io
@DevsClimbRock