Kubernetes project longhorn

Longhorn is lightweight, reliable, and powerful distributed block storage system for Kubernetes..

Parts of the Kubernetes series

• Part1a: Install K8S with ansible
• Part1b: Install K8S with kubeadm
• Part1c: Install K8S with kubeadm and containerd
• Part1d: Install K8S with kubeadm and allow swap
• Part1e: Install K8S with kubeadm in HA mode
• Part2: Intall metal-lb with K8S
• Part2: Intall metal-lb with BGP
• Part3: Install Nginx ingress to K8S
• Part4: Install cert-manager to K8S
• Part5a: Use local persisten volume with K8S
• Part5b: Use ceph persisten volume with K8S
• Part5c: Use ceph CSI persisten volume with K8S
• Part5d: Kubernetes CephFS volume with CSI driver
• Part5e: Use Project Longhorn as persisten volume with K8S
• Part5f: Use OpenEBS as persisten volume with K8S
• Part5f: vSphere persistent storage for K8S
• Part6: Kubernetes volume expansion with Ceph RBD CSI driver
• Part7a: Install k8s with IPVS mode
• Part7b: Install k8s with IPVS mode
• Part8: Use Helm with K8S
• Part9: Tillerless helm2 install
• Part10: Kubernetes Dashboard SSO
• Part11: Kuberos for K8S
• Part12: Gangway for K8S
• Part13a: Velero Backup for K8S
• Part13b: How to Backup Kubernetes to git?
• Part14a: K8S Logging And Monitoring
• Part14b: Install Grafana Loki with Helm3

You can install Longhorn on an existing Kubernetes cluster with one kubectl apply command or using Helm charts. Once Longhorn is installed, it adds persistent volume support to the Kubernetes cluster.

Install dependency

yum install iscsi-initiator-utils

modprobe iscsi_tcp
echo "iscsi_tcp" >/etc/modules-load.d/iscsi-tcp.conf

Deploy Longhorn and storageclass

kubectl apply -f https://raw.githubusercontent.com/rancher/longhorn/master/deploy/longhorn.yaml
kubectl apply -f https://raw.githubusercontent.com/rancher/longhorn/master/examples/storageclass.yaml

kubectl get storageclass
NAME       PROVISIONER          RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
longhorn   driver.longhorn.io   Delete          Immediate           false                  11m

Patch longhorn storageclass to be the default storageclass.

kubectl patch storageclass longhorn -p \
  '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

kubectl get storageclass
NAME                 PROVISIONER          RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
longhorn (default)   driver.longhorn.io   Delete          Immediate           false                  12m

Deploy admin gui

kubectl -n longhorn-system get svc

cat minio-sec.yaml
---
apiVersion: v1
kind: Secret
metadata:
  namespace: longhorn-system
  name: longhorn-minio
type: Opaque
data:
  AWS_ACCESS_KEY_ID: bWluaW8=
  AWS_SECRET_ACCESS_KEY: bWluaW8xMjM=
  AWS_ENDPOINTS: aHR0cDovL21pbmlvLmxvbmdob3JuLXN5c3RlbTo5MDAw