Docker Container Orchestration
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The document outlines key requirements and features of Kubernetes for container orchestration, highlighting its flexibility, community support, and the ability to deploy across multiple nodes. It details foundational concepts such as nodes, pods, replication controllers, and services, as well as practical examples of deploying applications with YAML definitions. Additional functionalities like persistent volumes and secrets management are noted, emphasizing the platform's robustness and self-healing capabilities.
Docker Container Orchestration
- 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
- 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
- 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
- 31. SAY HELLO TO MY LITTLE FRIEND…