STACKIT SKE - RWX with Longhorn

To enable Read Write Many (RWX) storage on STACKIT SKE clusters follow this guide to install Rancher Lognhorn.

Prerequisites

• Access to an SKE Cluster
• Helm & Kubectl installed
• (Optional) S3 Object Storage to store Backups

Dependencies

First we need to setup an Iscsi watchdog Daemonset that is starting the necessary services on the node.

kubectl create namespace iscsi-node
kubectl apply -f enableISCSI.yml

Install Longhorn

Installation

https://longhorn.io/docs/latest/deploy/install/install-with-helm/

helm repo add longhorn https://charts.longhorn.io
helm repo update
helm install longhorn longhorn/longhorn --namespace longhorn-system --create-namespace -f values.yaml --version $(curl -s https://api.github.com/repos/longhorn/longhorn/releases/latest | jq -r '.tag_name')
  

To use the install command provided here you need to have curl and jq installed

Optional: Add the values.yaml to enable the backup and prepare parameters during deployment. See backup section below

Create Longhorn Storage Class

kubectl apply -f storageClass.yaml

Create Test Deployoment

kubectl apply -f example-rwx-deployment.yaml

Backup configuration

If you enabled the Backup via the values.yaml you can now configure the S3 Bucket and the Backup Job, otherwise you can skip this part. https://longhorn.io/docs/latest/snapshots-and-backups/backup-and-restore/

Create Secret for backup on S3 [optional]

kubectl create secret generic <name> \
    --from-literal=AWS_ACCESS_KEY_ID=<s3-access-key> \
    --from-literal=AWS_SECRET_ACCESS_KEY=<s3 secret key> \
    --from-literal=AWS_ENDPOINTS='https://object.storage.eu01.onstackit.cloud' \
    -n longhorn-system

Create Recurring Backup Job [optional]

kubectl apply -f recurringBackupJob.yaml