LongHorn

Déployer une solution de stockage

Installation des prérequits sur TOUS LES NOEUDS : 

sudo apt-get update
sudo apt-get install -y open-iscsi nfs-common
sudo systemctl enable --now iscsid

Installation de Helm sur le master 1 :

curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
bash get_helm.sh

Préparation et déploiement de Longhorn :

helm repo add longhorn https://charts.longhorn.io
helm repo update

Dans le fichier : /root/longhorn-values.yaml :

defaultSettings:
  defaultDataPath: "/opt/longhorn"

Déploiement de longhorn : 

helm install longhorn longhorn/longhorn \
  --namespace longhorn-system \
  --create-namespace \
  -f /root/longhorn-values.yaml

Résultat : 

LAST DEPLOYED: Wed Apr 15 22:49:57 2026
NAMESPACE: longhorn-system
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
Longhorn is now installed on the cluster!

Please wait a few minutes for other Longhorn components such as CSI deployments, Engine Images, and Instance Managers to be initialized.

Visit our documentation at https://longhorn.io/docs/

Vérifications : 

kubectl get pods -n longhorn-system

NAME                                                READY   STATUS    RESTARTS      AGE
csi-attacher-5bcb65bf95-44fv7                       1/1     Running   1 (66s ago)   2m27s
csi-attacher-5bcb65bf95-jvqxj                       1/1     Running   0             2m27s
csi-attacher-5bcb65bf95-pgf8h                       1/1     Running   0             2m27s
csi-provisioner-5d498c6944-d65sl                    1/1     Running   0             2m27s
csi-provisioner-5d498c6944-dfl96                    1/1     Running   0             2m27s
csi-provisioner-5d498c6944-wvmvs                    1/1     Running   0             2m27s
csi-resizer-6c6474c996-9k94v                        1/1     Running   0             2m26s
csi-resizer-6c6474c996-mjtsj                        1/1     Running   0             2m27s
csi-resizer-6c6474c996-t94bs                        1/1     Running   0             2m26s
csi-snapshotter-5cc5fb45d9-pxz5r                    1/1     Running   0             2m26s
csi-snapshotter-5cc5fb45d9-swr6x                    1/1     Running   0             2m26s
csi-snapshotter-5cc5fb45d9-wsdh6                    1/1     Running   0             2m26s
engine-image-ei-75a03ec3-8r6p4                      1/1     Running   0             3m23s
engine-image-ei-75a03ec3-nmbdp                      1/1     Running   0             3m23s
engine-image-ei-75a03ec3-tl4x2                      1/1     Running   0             3m23s
engine-image-ei-75a03ec3-vcq2q                      1/1     Running   0             3m23s
instance-manager-8904e58b7c0d881b70d813ddd4fe86f4   1/1     Running   0             2m54s
instance-manager-9176dd8e42515fe6146f445c7a1bc3ad   1/1     Running   0             2m53s
instance-manager-9805597396c5db2820496e3f125bc6bc   1/1     Running   0             2m53s
instance-manager-eaeed3ca06747e29c0f3aa8b9557c5c8   1/1     Running   0             2m53s
longhorn-csi-plugin-7vtx8                           3/3     Running   0             2m26s
longhorn-csi-plugin-brx6d                           3/3     Running   0             2m26s
longhorn-csi-plugin-d4fxc                           3/3     Running   0             2m26s
longhorn-csi-plugin-tsrrg                           3/3     Running   0             2m26s
longhorn-driver-deployer-746f54969f-9gmlb           1/1     Running   0             4m5s
longhorn-manager-b7q7k                              2/2     Running   0             4m5s
longhorn-manager-fk6f4                              2/2     Running   0             4m5s
longhorn-manager-xghbf                              2/2     Running   0             4m5s
longhorn-manager-xt4xq                              2/2     Running   0             4m5s
longhorn-ui-5df99fc477-7zt5s                        1/1     Running   0             4m5s
longhorn-ui-5df99fc477-tzwdp                        1/1     Running   0             4m5s

Accéder à l'interface graphique :

kubectl patch svc longhorn-frontend -n longhorn-system -p '{"spec": {"type": "NodePort"}}'

Afficher le port :

kubectl get svc longhorn-frontend -n longhorn-system

On va utiliser le port :

NAME                TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
longhorn-frontend   NodePort   10.102.85.80   <none>        80:32555/TCP   6m22s

Exemple ici : http://192.168.1.104:32555/#/dashboard

On peut utiliser n'importe quelle IP du cluster.

Tester le stockage (pour aller plus loin) : 

Déclaration du PVC :

hello-pvc.yaml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: longhorn-hello-pvc
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: longhorn # On utilise le driver Longhorn
  resources:
    requests:
      storage: 1Gi # 1 Go c'est largement assez pour un test

Création d'un conteneur utilisant le PVC :

hello-app.yaml

apiVersion: v1
kind: Pod
metadata:
  name: hello-longhorn
spec:
  containers:
  - name: hello-world
    image: busybox
    # On écrit la date dans /data/coucou.txt en boucle
    command: ["sh", "-c", "while true; do date >> /data/coucou.txt; echo 'Donnée écrite !'; sleep 5; done"]
    volumeMounts:
    - name: storage-volume
      mountPath: /data
  volumes:
  - name: storage-volume
    persistentVolumeClaim:
      claimName: longhorn-hello-pvc

Application des changements :

kubectl apply -f hello-pvc.yaml
kubectl apply -f hello-app.yaml

Côté interface graphique :

Suppression du pod : 

kubectl delete pod hello-longhorn

Suppression du pvc : 

kubectl delete pvc longhorn-hello-pvc