1. Deployment Architectures For Containers
A platform agnostic way to update your Container Applications
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Jonathan Reeve
Senior Director Product Management
Oracle Container Cloud Service
March, 2017

3. Agenda 1
Types of Container Updates A Deployment Approach Deployment Components Demo Q&A 2 3 4 5

4. Types of Updates

5. Blue Green Deployments

6. Blue / Green Deployments
You have an existing running version, say Blue
You deploy a new version, say Green
Once you are satisfied that green is healthy/tested, switch incoming requests at the router to green.
User
Router

7. Canary / Rolling Updates

8. Canary Release / Rolling Updates
Gradually roll out a change to a subset of users
Existing version is blue, deploy a new version, Green
Once you are satisfied that green is healthy/tested, switch some % of requests at the router to green.
10%
User
90%
Router

9. Orchestrators

10. Rolling Update Support in Orchestrators (K8S and Swarm)
Kubernetes supports rolling updates (via deployments in Kubernetes 1.2+)
Part of deployments, control through “Max Unavailable” and “Max Surge” parameters
guide/deployments/#rolling-update- deployment
Docker Swarm rolling updates in 1.12+
Can define the #containers to update at a time and the delay
Stops existing containers before starting new ones
warm-tutorial/rolling-update/

11. An Orchestrator Independent Approach
Update container deployments simply with minimal dependency on Orchestration systems
Required Components
A way to deploy containers (CaaS or DIY)
API to start/stop containers etc…
A Load Balancer (we use a container load balancer)
A “router” to direct traffic to new deployments
Router should be able to pick up new containers (e.g. via confd)
Service Discovery System (Consul etc…)
To store the location of containers to be load balanced and configuration parameters
Build System & Script to Control New Deployments

12. CaaS (Containers as a Service)
We need a way (management system) to deploy containers
Could be DIY, or leverage a container service
Stop, start containers, remove deployments
Integrate via API
Here we leverage Oracle Container Cloud Service

13. Load Balancer and Service Discovery
Load Balancer Runs NGINX and Confd
Leveraging Runit
Each container registers with service discovery
Confd polls service discovery for container placement
Reloads NGINX config i.e. picks up container adds and removes, config changes
We use Service Discovery built in to OCCS here (similar to Consul)
Load Balancer / Router
Runit
Service Discovery
NGINX
Confd
Containers
Docker Hosts

14. Putting it Together – A Example Deployment Pipeline
Push Image
Docker Hub
Pull Image
Check In
Build
API
Deploy
Check In Code (& Docker File) to Github
Trigger Build (of Docker image) in Travis CI (linked to GitHub account)
j0nr33v3/hello-world
Push image to Docker Hub
Build script controls deployment of new containers on to Container Cloud Service via REST API, referencing built image.

15. Build System Deploy Script (Blue / Green)
Determine Target Color (opposite of existing color)
Trigger Deployment via API
Store Service Discovery Key for Target Color
Wait for new deployment to be healthy
Leverages “Healthchecks” in OCCS
Point router at new deployment
Remove original deployment (optional)
Can leave original deployment to support roll back
See

16. Blue/Green Service Discovery Keys

17. Blue / Green Demo
This slide can also be used as a Q and A slide

18. Canary, Rolling Updates
Trigger Deployment of the candidate via API
Wait for new deployment to be healthy
Store Service Discovery Key for the Candidate Version
Remove the Original (old candidate) Version
Gradually Increase Traffic to the candidate (from the stable version)
Promote the candidate to stable (gets all traffic)

19. Rolling Service Discovery Keys

20. Rolling Update Demo
This slide can also be used as a Q and A slide

21. Q&A

22. Resources

23. Resources Hello-world example https://github.com/j0nr33v3/hello-world
Includes Dockerfile, Travis CI config, blue green and rolling shell scripts
NGINX Routers (blue/green and rolling) images/tree/master/ContainerCloud/images