Hello everyone,

I'm currently setting up a small Kubernetes cluster and aim to run multiple Traefik instances sharing the same Let's Encrypt certificates. To handle persistent storage for Traefik and future applications, I've chosen Longhorn.

My cluster setup:

• 3 control plane nodes and 1 worker node (2/3 control planes have no taint preventing schedule)
• All nodes run Ubuntu 24.04.2 LTS with Linux kernel version 6.8.0-57-generic
• Using Cilium as the CNI plugin

I've followed these installation guides:

• [Longhorn installation documentation](https://longhorn.io/docs/1.8.1/deploy/install/)
• [Longhorn Helm installation documentation](https://longhorn.io/docs/1.8.1/deploy/install/install-with-helm/)

However, I've encountered an issue during the pre-installation checks. Running:

curl -sSfL https://raw.githubusercontent.com/longhorn/longhorn/v1.8.1/scripts/environment_check.sh | bash

returns the following error on some nodes:

[ERROR] kernel module iscsi_tcp is not enabled on master-ccx13-02

This is puzzling because according to the installation instructions, the open-iscsi package should ensure the kernel module is enabled:

Debian and Ubuntu: Run the following command:
apt-get install open-iscsi

I confirmed that open-iscsi is indeed installed on all nodes, yet the issue persists. Interestingly, the issue temporarily resolves if I manually run:

sudo modprobe iscsi_tcp

on the affected node. However, the problem reappears after a system restart, and I didn't find any reference to this in the Longhorn documentation.

Has anyone experienced this issue or have suggestions on how to resolve it permanently?

T