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How to manage stateful applications in Kubernetes

F
Florian Woerner

The document presents a talk on managing stateful applications in Kubernetes, detailing various types of volume management and the introduction of the Container Storage Interface (CSI). It emphasizes the importance of data persistence and provides real-world scenarios for persistent volumes and claims, alongside a demonstration segment. The conclusion includes references to official Kubernetes documentation and resources for implementing stateful applications.

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How to manage stateful applications in Kubernetes Devoxx France - 2018 1
Florian Woerner DevOps Engineer / Cloud Architect Onmyown @woernfl florian.woerner@onmyown.io 2
Agenda ● Context ● Volume provider ● Volumes lifecycle management ● Demo ● Conclusion 3@woernfl
Why should I choose Kubernetes over VMs? 4@woernfl
Because Kubernetes is a distributed system management framework 5
Why would we need to manage data persistence? 6@woernfl
Because, stateless architecture… it does not exist 7
Types of volumes 8
Types of Volumes - Kubernetes Internals ● configMap ● downwardAPI ● emptyDir ● gitRepo ● hostPath ● local ● persistentVolumeClaim ● projected ● Secret ● csi 9@woernfl
Types of Volumes - Public Cloud 10@woernfl ● awsElasticBlockStore ● azureDisk ● azureFile ● gcePersistentDisk
Types of Volumes - Non Cloud Dependant ● cephfs ● fc (fibre channel) ● flocker ● glusterfs ● nfs ● iscsi ● portworxVolume ● quobyte ● rbd (Rados Block Device) ● scaleIO ● storageos ● vsphereVolume 11@woernfl
Any issues? 12@woernfl
CSI to the rescue 13
What is CSI? ● Container Storage Interface ● Adopted by Kubernetes, Mesos and Cloud Foundry (for the moment) ● Supported as beta in Kubernetes 1.10 (planed to fall in stable for 1.12) ● Is a standardized way of exposing storage to a container 14@woernfl
Why is it so important? ● Common interface to multiple platforms (standardisation) ● Allow storage provider to release out of tree 15@woernfl
Real world scenario with Bob the dev and John the Sysadmin 16
Scenario: Persistent Volumes and Claims 17
Scenario: Persistent Volumes and Claims 18@woernfl Kubernetes Node Storage (NFS, EBS, ...)
Scenario: Persistent Volumes and Claims 19@woernfl Kubernetes Node Storage (NFS, EBS, ...) Persistent Volume
Scenario: Persistent Volumes and Claims 20@woernfl Kubernetes Node Storage (NFS, EBS, ...) Persistent Volume Persistent Volume Claim
Scenario: Persistent Volumes and Claims 21@woernfl Kubernetes Node Storage (NFS, EBS, ...) Persistent Volume Persistent Volume Claim Pod
Scenario: Persistent Volumes and Claims 22@woernfl Kubernetes Node Storage (NFS, EBS, ...) Persistent Volume Persistent Volume Claim Pod
Scenario: Dynamic Provisioning 23
Scenario: Dynamic Provisioning 24@woernfl Kubernetes Node Storage (NFS, EBS, ...)
Scenario: Dynamic Provisioning 25@woernfl Kubernetes Node Storage (NFS, EBS, ...) Storage Class - SDD Storage Class - HDD
Scenario: Dynamic Provisioning 26@woernfl Kubernetes Node Storage (NFS, EBS, ...) Persistent Volume Claim Storage Class - SDD Storage Class - HDD
Scenario: Dynamic Provisioning 27@woernfl Kubernetes Node Storage (NFS, EBS, ...) Persistent Volume Persistent Volume Claim Storage Class - SDD Storage Class - HDD
Scenario: Dynamic Provisioning 28@woernfl Kubernetes Node Storage (NFS, EBS, ...) Persistent Volume Persistent Volume Claim Pod Storage Class - SDD Storage Class - HDD
Scenario: Dynamic Provisioning 29@woernfl Kubernetes Node Storage (NFS, EBS, ...) Persistent Volume Persistent Volume Claim Pod Storage Class - SDD Storage Class - HDD
Demo 30
Conclusion 31
References 32 ● Volumes Kubernetes Doc: https://kubernetes.io/docs/concepts/storage/volumes/ ● Kubernetes Tasks: https://kubernetes.io/docs/tasks/ ● Configure a Pod to Use a PersistentVolume for Storage: https://kubernetes.io/docs/tasks/configure-pod-container/configure-persistent-volume-storage/ ● Run a Single-Instance Stateful Application: https://kubernetes.io/docs/tasks/run-application/run-single-instance-stateful-application/ ● Run a Replicated Stateful Application: https://kubernetes.io/docs/tasks/run-application/run-replicated-stateful-application/ ● StatefulSets Kubernetes Doc: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/ @woernfl
Thank you! 33 Link to the repos: https://gitlab.com/woernfl/k8s-stateful-demo

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How to manage stateful applications in Kubernetes