An Overview Of Kubernetes container orchestration. Covers concepts, deployment manifests and tooling as well a new incoming features.

1. DOCKER CONTAINER
ORCHESTRATION
Fernand Galiana

2. My Requirements
• Micro Service support
• Multi node deploys + Docker
• Multi ports TCP/UDP/HTTP
• DNS like support across cluster
• Deploy target: AWS
• Rolling updates
• Easy to grasp
• Community support
• Tooling

3. Whoosh!

4. Been All Around The World…
• Apache Mesos
• Docker Swarm
• ECS
• Kubernetes
• Deis
• Fleet
• Helios

5. Why Kubernetes?
• Flexibility
• Rest API
• Cluster orchestration
• Tooling
• Self healing
• Open source
• Not Vendor centric
• DockerCompose like
• Contributors 560+
• Community
• Google

6. CONCEPTS

7. K8S
• Node
• Pod
• Replication Controller
• Service
• Volume
• Namespace
• Label
• Annotation

8. Nodes
Master
Minion1 Minion2 Minion…

9. Nodes
Minion-1 Minion-2 Minion-n
Master
REST API

10. Pod
• Collocated Containers
• Same host
• Coupling
• Shared volume
• Ephemeral

11. Pod Definition
kind: Pod
apiVersion: v1
metadata:
name: nginx
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
ngnix.yml

12. Deploy!
kubectl create -f ngnix.yml

13. Labels
• Key/Value Tagging
• May Change during lifetime
• 63 chars alpha(-/_/.)

14. Label It!
kind: Pod
apiVersion: v1
metadata:
name: nginx
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80

15. Find it!
kubectl get pods -l app=nginx

16. Annotations
• Similar to labels
• !Selectors
• Track build#, versions

17. Replication Controller
• Pod Cloning
• Pod Supervisor

18. Selectors
• =,!=
• in, notin, exists, !exists
• , == AND

19. ReplicationController
kind: ReplicationController
apiVersion: v1
metadata:
name: nginx-controller
spec:
replicas: 2
selector:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80

20. ReplicationController
kind: ReplicationController
apiVersion: v1
metadata:
name: nginx-controller
spec:
replicas: 2
selector:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
MUST MATCH!!

21. Deploy!
kubectl create -f nginx-rc

22. GREAT NOW WHAT?

23. Services
• Logical set of pods
• Decoupling between pods and pod’s clients
• Pod(s) endpoint
• HaProxy on steroids (TCP, UDP, HTTP)
• Can point to !k8s endpoint (subsets)
• Virtual IP
• Services must exits before pods
• {SVC}SERVICE_HOST/{SVC}_SERVICE_PORT

24. Services
App2
App3
App1
4567
4567
4567
app=fred
KubeProxy
IpTables
ApiServer
Client
app=fred
app=fred

25. Volumes
• Outlive container’s crash
• Medium: Dir|Memory
• Types: emptyDir|hostPath|NFS|EBS|gitRepo,…
• Specify mount point

26. Persistent Volumes
• Persistent volume (PV)
• Persistent volume claim (PVC)

27. Secrets
• OAUTH Tokens
• User/Pwd

28. DEMO
Demo

29. New Features
• Daemon Sets
• Deployments
• Ingress Ressources
• Horizontal Pods
• Jobs

30. Resources
• kubernetes.io
• github.com/kubernetes/kubernetes

31. SAY HELLO TO MY LITTLE
FRIEND…

32. THOUGHTS?
THANK YOU!!