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Running stateful applications in containers with k8 s persistent volumes and statefulsets

K
Kapil Arora

The document discusses running stateful applications in Kubernetes using persistent volumes and stateful sets, detailing various storage types and volume plugins. It covers dynamic and static provisioning with examples of NetApp's Trident for automated storage management, and illustrates a PostgreSQL demo for deploying stateful applications. The content emphasizes the importance of persistent data management in container orchestration and future directions in container storage interfaces.

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Running Stateful Applications in Containers with K8S Persistent Volumes and StatefulSets OpenStack Summit, Vancouver Kapil Arora Solution Architect, NetApp EMEA May 23, 2018
Agenda 1) Stateful Apps and Persistent Data 2) K8S Persistent Data Concepts 3) Static vs Dynamic Provisioning 4) NetApp Trident 5) PostgreSQL Demo 2 © 2018 NetApp, Inc. All rights reserved.
Stateful Apps and Persistent Data 3 © 2018 NetApp, Inc. All rights reserved.
Stateful Apps § SQL Databases § MySQL, PostgreSQL, SQL Server § NoSQL Databases § MongoDB, ElasticSearch, Redis, Cassandra § Pub Sub Systems § Kafka § Time series Databases § InfluxDB, Graphite § Big Data § Splunk For Example 4 © 2018 NetApp, Inc. All rights reserved.
Persistent Data § Object § S3, Swift § File § NFS, SMB, Manila, GlusterFS § Block § iSCSI, FC, EBS, Cinder For Example 5 © 2018 NetApp, Inc. All rights reserved.
Kubernetes Volume Plugins 6 © 2018 NetApp, Inc. All rights reserved.
Kubernetes Volume Plugins § Reference block device and mounted file system § Accesible by all containers in a pod § Lifetime of a volume is same as the pod (or longer) 7 © 2018 NetApp, Inc. All rights reserved. Kubernetes Node Volume POD kubelet Docker NFSVol1 NFSiSCSI Cinder Azure Disk GCE PD EBS RDB VOLUME PLUGINS and more…
§ Remote § GCEPersistentDisk § AWSElasticBlockStore § AzureFile, AzureDisk § iSCSI , FC § Flocker § NFS § RBD, CephFS, GlusterFS § Cinder § VsphereVolume, VMware Photon § Quobyte Volumes § Portworx Volumes § ScaleIO Volumes § StorageOS Kubernetes Volume Plugins § Ephemeral § Empty Dir § Secret § ConfigMap § Local Persistent Volume (beta) § Out-of-tree § CSI (beta) § Other § Host path 8 © 2018 NetApp, Inc. All rights reserved.
Example § Cinder Volume in a Pod 9 © 2018 NetApp, Inc. All rights reserved.
Example § EBS Volume in a Pod 10 © 2018 NetApp, Inc. All rights reserved.
Example § iSCSI volume in a Pod 11 © 2018 NetApp, Inc. All rights reserved.
Decouple storage implementation from consumption PV and PVC Abstraction 12 © 2018 NetApp, Inc. All rights reserved.
Administrator creates a PV § PV: PersistentVolume API Object • Configured for backing storage device • NFS, iSCSI, Cinder, AWS EBS, GCE, Azure • Includes connection information for the storage volume § Example: NFS PV 13 © 2018 NetApp, Inc. All rights reserved.
User Creates PVC § PVC § PersistentVolumeClaim API Object • Created by a user to request storage § User provides: § Size § Access mode § Storage class (optional) • Kubernetes assigns a PV to meet the requirements requested in the PVC • Does not require an exact match for capacity 14 © 2018 NetApp, Inc. All rights reserved.
User provides PVC name in the Pod/Deployment § PVC claim name § mount path 15 © 2018 NetApp, Inc. All rights reserved.
Kubernetes Static Provisioning 16 © 2018 NetApp, Inc. All rights reserved. K8SUser / Developer Cluster / IT Admin PV 5 GB RWO iSCSI POD PVC 5 GB RWO K8S PV Controller PersistentVolumeClaim PersistentVolume Storage POD PVC 8 GB RWO PV 10 GB RWO NFS
Storage Classes and Dynamic Provisioning 17 © 2018 NetApp, Inc. All rights reserved.
StorageClass § Administrators can classify different storage types in the K8s environment using Storage classes § Example § SSD/HDD § QoS § Dedupe/compression § Protocol: iSCSI/NFS § Etc. § Abstract underlying storage § E.g. Gold::Silver::Bronze 18 © 2018 NetApp, Inc. All rights reserved.
SC Example § Cinder 19 © 2018 NetApp, Inc. All rights reserved.
SC Example § NetApp ONTAP § NFS § SSD 20 © 2018 NetApp, Inc. All rights reserved.
Kubernetes Dynamic Provisioining 21 © 2018 NetApp, Inc. All rights reserved. OpenShiftUser / Developer Cluster / IT Admin PV 8 GB RWO NFS POD PVC 8 GB RWO GOLD K8S PV Controller PersistentVolumeClaim StorageClass Gold SSD block iSCSI Bronze HDD NetApp NetApp Provisioner (Trident)
NetApp Trident 22 © 2018 NetApp, Inc. All rights reserved.
Trident for Kubernetes § NetApp's Open source dynamic storage provisioner supporting: § ONTAP § SolidFire § E-Series § Automates Volume Creation and Mapping § Compatible with: § Kubernetes § OpenShift Origin & RedHat OCP § Snapshot and Cloning enabled § Available on GitHub: https://github.com/NetApp/trident 23 © 2018 NetApp, Inc. All rights reserved.
Resource Quotas § Kubernetes Resource Quotas § https://kubernetes.io/docs/concepts/policy/resource-quotas/ § Blog § https://netapp.io/2017/06/09/self-provisioning-storage-kubernetes-without-worry/ § Set Limits on § requests.storage § value.storageclass.storage.k8s.io/requests.storage § persistentvolumeclaims § value.storageclass.storage.k8s.io/persistentvolumeclaims 24 © 2018 NetApp, Inc. All rights reserved.
Future § Container Storage Interface (CSI) § Moving towards an industry standard, orchestrator-agnostic basic storage abstraction § Standard API § Now Beta! § Spec § https://github.com/container-storage-interface/spec § Blog § https://kubernetes.io/blog/2018/04/10/container-storage-interface- beta/ 25 © 2018 NetApp, Inc. All rights reserved.
Demo : PostgreSQL 26 © 2018 NetApp, Inc. All rights reserved.
27 © 2018 NetApp, Inc. All rights reserved. Kubernetes-cluster psql StatefulSet (master) psql pod-0 (replica) psql pod-1 (replica) psql pod-2 pv-1 pv-3pv-2 psql service master psql service psql service replica pvc-1 pvc-3pvc-2 Dynamic Storage Provisioner Helm / Tiller
Why use Helm? § Standardized deployments § Build a catalog for users § Repeatable and predictable deployments § Follow best practices 28 © 2018 NetApp, Inc. All rights reserved.
StatefulSets When and Why? 29 © 2018 NetApp, Inc. All rights reserved. State + Scale Unique Network IDs Ordered Deployment & Termination
30 © 2018 NetApp, Inc. All rights reserved. Trident postgresql- pv-0 postgresql-statefulset (replica=3) postgresql-pod-0 postgresql- container postgresql- pvc-0 postgresql- service port: 5432 postgresql-pod-1 postgresql- container postgresql-pod-2 postgresql- container postgresql- pv-1 postgresql- pvc-1 postgresql- pv-2 postgresql- pvc-2 Deploy postgresqlDB 3 replica StatefulSet
31 © 2018 NetApp, Inc. All rights reserved.
§ Stateful Apps run on Kubernetes § PV, PVC and StorageClass § Static vs Dynamic provisioning § NetApp Trident § CSI 32 Summary © 2018 NetApp, Inc. All rights reserved.
§ Blog and Video § https://netapp.io/2018/03/21/deploy-postgresql-using-kubernetes-helm-trident/ § PostgreSQL sample Helm Chart § https://github.com/NetAppEMEA/kubernetes-netapp § NetApp Trident § https://github.com/NetApp/trident 33 © 2018 NetApp, Inc. All rights reserved. Resources
thePub: NetApp’s Developer and Open Source Community Engage with NetApp Engineers, Partners, and Customers © 2018 NetApp, Inc. All rights reserved. --- NETAPP CONFIDENTIAL ---34 GitHub github.com/NetApp/trident thePub netapp.io Twitter @NetAppPub Slack netapp.io/slack NetApp website nt-ap.com/2CneVeR
35 Thank You © 2018 NetApp, Inc. All rights reserved.

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Running stateful applications in containers with k8 s persistent volumes and statefulsets

  • 1. Running Stateful Applications in Containers with K8S Persistent Volumes and StatefulSets OpenStack Summit, Vancouver Kapil Arora Solution Architect, NetApp EMEA May 23, 2018
  • 2. Agenda 1) Stateful Apps and Persistent Data 2) K8S Persistent Data Concepts 3) Static vs Dynamic Provisioning 4) NetApp Trident 5) PostgreSQL Demo 2 © 2018 NetApp, Inc. All rights reserved.
  • 3. Stateful Apps and Persistent Data 3 © 2018 NetApp, Inc. All rights reserved.
  • 4. Stateful Apps § SQL Databases § MySQL, PostgreSQL, SQL Server § NoSQL Databases § MongoDB, ElasticSearch, Redis, Cassandra § Pub Sub Systems § Kafka § Time series Databases § InfluxDB, Graphite § Big Data § Splunk For Example 4 © 2018 NetApp, Inc. All rights reserved.
  • 5. Persistent Data § Object § S3, Swift § File § NFS, SMB, Manila, GlusterFS § Block § iSCSI, FC, EBS, Cinder For Example 5 © 2018 NetApp, Inc. All rights reserved.
  • 6. Kubernetes Volume Plugins 6 © 2018 NetApp, Inc. All rights reserved.
  • 7. Kubernetes Volume Plugins § Reference block device and mounted file system § Accesible by all containers in a pod § Lifetime of a volume is same as the pod (or longer) 7 © 2018 NetApp, Inc. All rights reserved. Kubernetes Node Volume POD kubelet Docker NFSVol1 NFSiSCSI Cinder Azure Disk GCE PD EBS RDB VOLUME PLUGINS and more…
  • 8. § Remote § GCEPersistentDisk § AWSElasticBlockStore § AzureFile, AzureDisk § iSCSI , FC § Flocker § NFS § RBD, CephFS, GlusterFS § Cinder § VsphereVolume, VMware Photon § Quobyte Volumes § Portworx Volumes § ScaleIO Volumes § StorageOS Kubernetes Volume Plugins § Ephemeral § Empty Dir § Secret § ConfigMap § Local Persistent Volume (beta) § Out-of-tree § CSI (beta) § Other § Host path 8 © 2018 NetApp, Inc. All rights reserved.
  • 9. Example § Cinder Volume in a Pod 9 © 2018 NetApp, Inc. All rights reserved.
  • 10. Example § EBS Volume in a Pod 10 © 2018 NetApp, Inc. All rights reserved.
  • 11. Example § iSCSI volume in a Pod 11 © 2018 NetApp, Inc. All rights reserved.
  • 12. Decouple storage implementation from consumption PV and PVC Abstraction 12 © 2018 NetApp, Inc. All rights reserved.
  • 13. Administrator creates a PV § PV: PersistentVolume API Object • Configured for backing storage device • NFS, iSCSI, Cinder, AWS EBS, GCE, Azure • Includes connection information for the storage volume § Example: NFS PV 13 © 2018 NetApp, Inc. All rights reserved.
  • 14. User Creates PVC § PVC § PersistentVolumeClaim API Object • Created by a user to request storage § User provides: § Size § Access mode § Storage class (optional) • Kubernetes assigns a PV to meet the requirements requested in the PVC • Does not require an exact match for capacity 14 © 2018 NetApp, Inc. All rights reserved.
  • 15. User provides PVC name in the Pod/Deployment § PVC claim name § mount path 15 © 2018 NetApp, Inc. All rights reserved.
  • 16. Kubernetes Static Provisioning 16 © 2018 NetApp, Inc. All rights reserved. K8SUser / Developer Cluster / IT Admin PV 5 GB RWO iSCSI POD PVC 5 GB RWO K8S PV Controller PersistentVolumeClaim PersistentVolume Storage POD PVC 8 GB RWO PV 10 GB RWO NFS
  • 17. Storage Classes and Dynamic Provisioning 17 © 2018 NetApp, Inc. All rights reserved.
  • 18. StorageClass § Administrators can classify different storage types in the K8s environment using Storage classes § Example § SSD/HDD § QoS § Dedupe/compression § Protocol: iSCSI/NFS § Etc. § Abstract underlying storage § E.g. Gold::Silver::Bronze 18 © 2018 NetApp, Inc. All rights reserved.
  • 19. SC Example § Cinder 19 © 2018 NetApp, Inc. All rights reserved.
  • 20. SC Example § NetApp ONTAP § NFS § SSD 20 © 2018 NetApp, Inc. All rights reserved.
  • 21. Kubernetes Dynamic Provisioining 21 © 2018 NetApp, Inc. All rights reserved. OpenShiftUser / Developer Cluster / IT Admin PV 8 GB RWO NFS POD PVC 8 GB RWO GOLD K8S PV Controller PersistentVolumeClaim StorageClass Gold SSD block iSCSI Bronze HDD NetApp NetApp Provisioner (Trident)
  • 22. NetApp Trident 22 © 2018 NetApp, Inc. All rights reserved.
  • 23. Trident for Kubernetes § NetApp's Open source dynamic storage provisioner supporting: § ONTAP § SolidFire § E-Series § Automates Volume Creation and Mapping § Compatible with: § Kubernetes § OpenShift Origin & RedHat OCP § Snapshot and Cloning enabled § Available on GitHub: https://github.com/NetApp/trident 23 © 2018 NetApp, Inc. All rights reserved.
  • 24. Resource Quotas § Kubernetes Resource Quotas § https://kubernetes.io/docs/concepts/policy/resource-quotas/ § Blog § https://netapp.io/2017/06/09/self-provisioning-storage-kubernetes-without-worry/ § Set Limits on § requests.storage § value.storageclass.storage.k8s.io/requests.storage § persistentvolumeclaims § value.storageclass.storage.k8s.io/persistentvolumeclaims 24 © 2018 NetApp, Inc. All rights reserved.
  • 25. Future § Container Storage Interface (CSI) § Moving towards an industry standard, orchestrator-agnostic basic storage abstraction § Standard API § Now Beta! § Spec § https://github.com/container-storage-interface/spec § Blog § https://kubernetes.io/blog/2018/04/10/container-storage-interface- beta/ 25 © 2018 NetApp, Inc. All rights reserved.
  • 26. Demo : PostgreSQL 26 © 2018 NetApp, Inc. All rights reserved.
  • 27. 27 © 2018 NetApp, Inc. All rights reserved. Kubernetes-cluster psql StatefulSet (master) psql pod-0 (replica) psql pod-1 (replica) psql pod-2 pv-1 pv-3pv-2 psql service master psql service psql service replica pvc-1 pvc-3pvc-2 Dynamic Storage Provisioner Helm / Tiller
  • 28. Why use Helm? § Standardized deployments § Build a catalog for users § Repeatable and predictable deployments § Follow best practices 28 © 2018 NetApp, Inc. All rights reserved.
  • 29. StatefulSets When and Why? 29 © 2018 NetApp, Inc. All rights reserved. State + Scale Unique Network IDs Ordered Deployment & Termination
  • 30. 30 © 2018 NetApp, Inc. All rights reserved. Trident postgresql- pv-0 postgresql-statefulset (replica=3) postgresql-pod-0 postgresql- container postgresql- pvc-0 postgresql- service port: 5432 postgresql-pod-1 postgresql- container postgresql-pod-2 postgresql- container postgresql- pv-1 postgresql- pvc-1 postgresql- pv-2 postgresql- pvc-2 Deploy postgresqlDB 3 replica StatefulSet
  • 31. 31 © 2018 NetApp, Inc. All rights reserved.
  • 32. § Stateful Apps run on Kubernetes § PV, PVC and StorageClass § Static vs Dynamic provisioning § NetApp Trident § CSI 32 Summary © 2018 NetApp, Inc. All rights reserved.
  • 33. § Blog and Video § https://netapp.io/2018/03/21/deploy-postgresql-using-kubernetes-helm-trident/ § PostgreSQL sample Helm Chart § https://github.com/NetAppEMEA/kubernetes-netapp § NetApp Trident § https://github.com/NetApp/trident 33 © 2018 NetApp, Inc. All rights reserved. Resources
  • 34. thePub: NetApp’s Developer and Open Source Community Engage with NetApp Engineers, Partners, and Customers © 2018 NetApp, Inc. All rights reserved. --- NETAPP CONFIDENTIAL ---34 GitHub github.com/NetApp/trident thePub netapp.io Twitter @NetAppPub Slack netapp.io/slack NetApp website nt-ap.com/2CneVeR
  • 35. 35 Thank You © 2018 NetApp, Inc. All rights reserved.