DevNexus, VoxxedDays Bucharest 2019 presentation

1. Kubernetes & the
12 factors cloud
applications
Ana Maria Mihalceanu

2. @ammbra1508
HELLO!
I am Ana
Technical Lead @ IBM
Co-founder of Bucharest Software Craftsmanship Community

3. s
@ammbra1508
Why 12 factors and Kubernetes?
Run at push
of a button
Evolution
Declarative
formats
Scale up
with
minimal
changes

4. s
@ammbra1508
Why 12 factors and Kubernetes?
PortabilityLocal vs
production
Run at push
of a button
Evolution
Declarative
formats
Scale up
with
minimal
changes
Clean
Contract
Continuous
deployment

5. s
@ammbra1508
Scenario

6. @ammbra1508
FACTOR 1 - CODEBASE
One codebase tracked in
revision control,
with multiple deployments.

8. @ammbra1508
FACTOR 1 - CODEBASE
helm install ${chart}
--name ${release}
--namespace ${namespace}
-f values.<namespace>.yaml

9. @ammbra1508
FACTOR 2 - DEPENDENCIES
Explicitly declare and
isolate dependencies.

10. s
@ammbra1508
FACTOR 3 - CONFIGURATION

11. s
@ammbra1508
FACTOR 3 - CONFIGURATION
Store configuration in the environment.
kubectl create secret docker-registry ${SECRET_NAME}
--namespace ${CLUSTER_NAMESPACE}
--docker-server=${REGISTRY}
--docker-password=${TOKEN}
--docker-username=iamapikey --docker-email=a@b.com

12. s
@ammbra1508
FACTOR 4 – BACKING SERVICE

13. s
@ammbra1508
FACTOR 4 – BACKING SERVICE
Treat backing services as attached resources.
ibmcloud ks cluster-service-bind
--cluster ${CLUSTER} --namespace {NS}
--service ${GUID}

14. @ammbra1508
FACTOR 5 – BUILD, RELEASE, RUN

15. @ammbra1508
FACTOR 5 – BUILD, RELEASE, RUN
Strictly separate build and
run stages.

16. s
@ammbra1508
FACTOR 5 – BUILD, RELEASE, RUN

18. @ammbra1508
FACTOR 6 – Processes
Execute the app as one or more
stateless processes.
Container
Filesystem
Persistent
VolumeVolume

19. s
@ammbra1508
FACTOR 6 – Processes
kubectl apply –f ${CREATE_VOLUME}.yaml
kubectl apply –f ${COPY_SCRIPTS_POLLER}.yaml
kubectl cp ./scripts ${POD}:/${LOCATION}
kubectl apply –f ${USE_SCRIPTS}.yaml

20. s
@ammbra1508
FACTOR 7 – PORT BINDING
kubectl apply –f ${DEPLOYMENT_FILE}

21. s
@ammbra1508
FACTOR 7 – PORT BINDING
Export services via port binding.
kubectl expose deployment/${NAME}
--type=”${SERVICE_TYPE}”
--name=${SERVICE_NAME}

22. s
@ammbra1508
FACTOR 8 – CONCURRENCY
22
YAML
Deployment Replica Set
Selector Selector
Pod Template Template
replicas = 2 spec.replicas = 2
POD
POD
APPLY

23. s
@ammbra1508
FACTOR 8 – CONCURRENCY
Scale out via the process model.
kubectl autoscale deployment {$DEPLOYMENT}
--min=${MIN_PODS} --max=${MAX_PODS}
--cpu-percent=${CPU}
--namespace=${NAMESPACE}

24. s
@ammbra1508
FACTOR 9 – DISPOSABILITY
helm upgrade ${RELEASE} ${CHART} --recreate-pods
Fast startup Graceful shutdown

25. s
@ammbra1508
FACTOR 9 – DISPOSABILITY
kubectl delete replicaset ${REPLICA}
helm delete --purge ${RELEASE_NAME}

27. @ammbra1508
FACTOR 10 – DEV PROD PARITY
Time
People
Tools

28. s
@ammbra1508
FACTOR 10 – DEV PROD PARITY
Keep development, staging and production
as similar as possible.
kubectl create namespace ${NAMESPACE}

29. s
@ammbra1508
FACTOR 11 - LOGS

30. s
@ammbra1508
FACTOR 11 - LOGS
kubectl create secret generic logdna-agent-key
--from-literal=logdna-agent-key=<ingestion_key>
kubectl create -f
https://repo.logdna.com/ibm/prod/logdna-agent-ds-us-
south.yaml

31. s
@ammbra1508
FACTOR 12 – ADMIN PROCESSES
Run admin/management tasks as one-off processes.
kubectl create configmap ${CONFIG}
--from-file=scripts/ -o yaml
kubectl apply –f ${ONE_TIME_JOB_CONFIGURATION}

32. Takeaways
Decouple
Decouple
infrastructure
complexity from your
application code.
Managed Services
Prefer managed
services in matters
involving persistency.
Environment Parity
Keep your environments
as similar as possible.

33. Takeaways
Stateless
Design your
application as
stateless.
Scale
Your application
should be able to
process diverse
workloads.
Monitor
Use appropriate
logging in application
code and implement
cluster-level logging.

34. “The strongest factor for success
is self-esteem. Believing you can
do it, believing you deserve it,
believing you will get it.
Anonymous

35. @ammbra1508
THANKS!
Any questions?
You can find me at
@ammbra1508

36. s
Template credits: SlidesCarnival
Useful links
http://ibm.biz/javanewsletter
https://goo.gl/TwiB3i