Longhorn dependencies

[SanekP]

I have installed kairos-rockylinux-9-standard-amd64-generic-v3.4.2-k0sv1.32.4+k0s.0.iso and now trying to install Longhorn
longhorn-manager time="2025-05-25T13:53:07Z" level=fatal msg="Error starting manager: failed to check environment, please make sure you have iscsiadm/open-iscsi installed on the host: failed to execute: /usr/bin/nsenter [nsenter --mount=/host/proc/2904/ns/mnt --net=/host/proc /2904/ns/net iscsiadm --version], output , stderr nsenter: failed to execute iscsiadm: No such file or directory\n: exit status 127" func=main.main.DaemonCmd.func3 file="daemon.go:105"
Does Kairos have extensions for this like Talos? I see https://github.com/kairos-io/community-bundles?tab=readme-ov-file#longhorn but it looks like for k3s only and anyway I don't see adding of iscsi.

[jimmykarily]

Hi @SanekP I think what you see is missing dependencies on the base image. You just need to add what's missing in your Dockerfile. See here for more: https://kairos.io/docs/reference/kairos-factory/

[SanekP]

Yeah but I haven't used a Dockerfile as I said I have installed system from kairos-rockylinux-9-standard-amd64-generic-v3.4.2-k0sv1.32.4+k0s.0.iso image. Kairos provides images but they are not usable for some cases. So it is not clear purpose of such images. Is it just a demonstration? If Kairos doesn't care about 3PPs then why it already has binds /usr/local/.state/ for popular software?

Where I can find Dockerfile which used to build quay.io/kairos/rockylinux:9-standard-amd64-generic-v3.4.2-k0sv1.32.4-k0s.0?

PS I switched distribution just with kairos-agent upgrade --source oci:quay.io/kairos/ubuntu:24.04-standard-amd64-generic-master-k0s and now Longhorn has all dependencies. k0s stayed fully working with all data - that's impressive! But as I understand there are no guarantees that future ubuntu releases will also contain required dependencies.
I run this command on node node and it got v1.32.5+k0s. After two days later I run same command on another node and it got v1.33.1+k0s. Now I run on first node and it still on v1.32.5+k0s - does it cache somewhere?

[jimmykarily]

As you found out, different distributions come with different pre-installed packages. We don't test all user scenarios/workloads on all flavors because that would make a very big testing matrix.

To add a a dependency to an image, you don't necessarily need the original Dockerfile. You can just create your own dockerfile and start from the released Kairos image. Just add the dependencies you need on top. Unless your dependencies are needed in the initramfs, you don't need to do anything else (rebuild initramfs etc).

You get different results because you are using the -master- artifact. This is building from master and it not stable, it changes whenever we push to master and it's only for testing purposes. Use a specific version to get stable results. E.g.

quay.io/kairos/ubuntu:24.10-standard-amd64-generic-v3.4.2-k0sv1.32.4-k0s.0