README.md

Enable CSI in k8s cluster

The CSI specification 1.0 is GA since kubernetes release 1.13 but disabled by default.

In the following video, we will show how to enable it on our three nodes cluster with one master (k8s-master) and two minions(k8s-minion-1 & k8s-minion-2).

To enable the driver there are 3 main steps :

1. On every nodes, configure kubelet service to use CSI with:

   • /var/lib/kubelet/config.yaml

   VolumeSnapshotDataSource: true
   KubeletPluginsWatcher: true
   CSINodeInfo: true
   CSIDriverRegistry: true
   BlockVolume: true
   CSIBlockVolume: true
   

   • and /etc/systemd/system/kubelet.service.d/10-kubeadm.conf :

   --allow-privileged=true --feature-gates=VolumeSnapshotDataSource=true,KubeletPluginsWatcher=true,CSINodeInfo=true,CSIDriverRegistry=true,BlockVolume=true,CSIBlockVolume=true
   

2. On every nodes, configure docker service (/etc/systemd/system/multi-user.target.wants/docker.service)to use MountFlags=shared

3. On master node, configure /etc/kubernetes/manifests/kube-apiserver.yaml, /etc/kubernetes/manifests/kube-controller-manager.yaml, and /etc/kubernetes/manifests/kube-scheduler.yaml to use the CSI flags

   - --feature-gates=VolumeSnapshotDataSource=true,KubeletPluginsWatcher=true,CSINodeInfo=true,CSIDriverRegistry=true,BlockVolume=true,CSIBlockVolume=true
   

For detailed configuration, you can refer to the official CSI documentation

Install VxFlexOS CSI Driver

Soon

Use postgres HA + CSI Driver

In that demo we use CrunchyData PosgreSQL distribution which provides native High Availability configuration.

The modifications made to the original helm chart are :

• vxflexos as default storage class
• A new service NodePort (TCP 31432) to ease connection to the DB from external world
• A bigger default pvc to be consistent with VxFlexOS requirements

For more documentation on pod setup and the configuration you can do, please refer to : https://crunchydata.github.io/crunchy-containers/stable/container-specifications/crunchy-postgres/

Step 1 - Check CSI driver for VxFlexOS

Step 2 - Install PostgreSQL in HA with VxFlexOS

Step 3 - Load data in Postgres and make sure it is synchronized

Step 4 - Node failure and scale Posgres

Infinite scaling with Couchbase and VxFlex OS

Soon

Have fun with snapshots

Soon