Longhorn by Rancher

Install on Microk8s

kubectl create namespace longhorn-system
helm install longhorn longhorn/longhorn --namespace longhorn-system --set csi.kubeletRootDir=/var/snap/microk8s/common/var/lib/kubelet

• hostPath type check failed: kubelet/plugins_registry is not a directory which is why you set path
• https://longhorn.io/docs/0.8.0/users-guide/settings/
• https://longhorn.io/docs/1.1.1/references/examples/

View replicas on each node

ls /var/lib/longhorn/replicas/

More Docs

https://longhorn.io/docs/1.0.0/concepts/

https://longhorn.io/docs/1.0.0/deploy/install/install-with-helm/

https://youtu.be/Ho4zEF8pzvE

https://youtu.be/zJY2uxLtwUk

https://medium.com/volterra-io/kubernetes-storage-performance-comparison-v2-2020-updated-1c0b69f0dcf4

https://longhorn.io/docs/1.1.1/references/longhorn-client-python/

Troubleshooting

1

kubectl get pods -n longhorn-system | grep longhorn-driver-deployer
longhorn-driver-deployer-5d45dcdc5d-w48c4   0/1     CrashLoopBackOff   6          10m
# This will be Error or CrashLoopBackOff

https://github.com/longhorn/longhorn/issues/1861

kubectl create namespace longhorn-system
# mkdir /var/lib/kubelet/plugins_registry
# helm install longhorn longhorn/longhorn --namespace longhorn-system --set csi.kubeletRootDir=/var/lib/kubelet  # https://github.com/longhorn/longhorn/issues/1861
helm install longhorn longhorn/longhorn --namespace longhorn-system --set csi.kubeletRootDir=/var/snap/microk8s/common/var/lib/kubelet
curl https://raw.githubusercontent.com/longhorn/longhorn/master/deploy/longhorn.yaml | sed -e 's/#- name: KUBELET_ROOT_DIR/- name: KUBELET_ROOT_DIR/g' -e 's$#  value: /var/lib/rancher/k3s/agent/kubelet$  value: /var/lib/kubelet$g' | kubectl apply -f -

• https://longhorn.io/docs/0.8.0/users-guide/distribution-specific-notes/csi-on-rke-and-coreos/

longhorn-csi-plugin-bkmnz                   0/2     ContainerCreating   0          3m14s

# no work ## helm install longhorn longhorn/longhorn --namespace longhorn-system --set kubelet-root-dir=/var/lib/kubelet