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SELinux and Longhorn

· 8 min read
Eric Weber

Applicable versions​

All Longhorn versions.

Purpose​

The purpose of this article is to help Longhorn users understand how Longhorn typically acts in SELinux-enabled systems and provide them with basic commands to run to verify normal operation. It is a work in progress that may be expanded as Longhorn maintainers discover additional SELinux behaviors that are of interest. It is not intended to be a guide to SELinux or using SELinux with Kubernetes.

Troubleshooting: RWX Volume Fails to Be Attached Caused by `Protocol not supported`

· 2 min read
Derek Su

Applicable versions​

All Longhorn versions.

Symptoms​

Attempts to attach an RWX volume are unsuccessful, and the workload using the volume is unable to start. The logs contain the following messages:

Oct 11 07:42:23 dev-worker-1 k3s[1294]: Mounting command: /usr/local/sbin/nsmounter
Oct 11 07:42:23 dev-worker-1 k3s[1294]: Mounting arguments: mount -t nfs -o vers=4.1,noresvport,intr,hard 10.43.207.185:/pvc-13538170-4278-4467-b2b0-1f1ba6f54a4c /var/lib/kubelet/plugins/kubernetes.io/csi/driver.longhorn.io/185c34f566c2eca6e8c7c6a2ede2094c076d7d25ddae286dc633eeef80551af0/globalmount
Oct 11 07:42:23 dev-worker-1-autoscaled-small-19baf778f50efd8c k3s[1294]: Output: mount.nfs: Protocol not supported for 10.43.207.185:/pvc-13538170-4278-4467-b2b0-1f1ba6f54a4c on /var/lib/kubelet/plugins/kubernetes.io/csi/driver.longhorn.io/185c34f566c2eca6e8c7c6a2ede2094c076d7d25ddae286dc633eeef80551af0/globalmount