Support for Fedora CoreOS

[sylflo]

Description of Issue/Question

CoreOS will be deprecated very soon https://coreos.com/os/eol/. For now it's possible to use this plugin with the ignition of coreOS. I know for coreOS replacement there is Flatcar which is working for this provider https://github.com/dmacvicar/terraform-provider-libvirt/blob/master/examples/v0.12/flatcar-linux, it's pretty awesome :D.

I was wondering if this provider works with Fedora CoreOS, I found this plugin provider https://github.com/poseidon/terraform-provider-ct, I was wondering if I could mix the libvirt provider and flatcar together ?

[MalloZup]

@sylflo hi . @tormath1 did the flatcar example.

Regarding the question, can you be more precise? I didn't get your question :grin:

The libvirt provider is a golang binary. If you build it on X Distro it will work using libvirt.

So I guess even in this X distro should work. Feel free to ask any other question . :rose:

[sylflo]

Since CoreOS will be deprecated and officialy replace by Fedora CoreOS, I was wondering:

• if it's possible to do something like this with the libvirt provider when using Fedora CoreOS

  coreos_ignition = element(libvirt_ignition.ignition.*.id, count.index)

My first guess is that it is not possible since for Fedora CoreOS, we apparently need yaml and the properties changed https://github.com/coreos/fcct/blob/master/docs/configuration-v1_0.md

• Since it's probably not possible, could it be a solution to use this provider https://github.com/poseidon/terraform-provider-ct

And do something like this

data "ct_config" "worker" {
  content      = file("worker.yaml")
  pretty_print = false
  strict       = true
}

resource "libvirt_domain" "node" {
  coreos_ignition = data.ct_config.worker.rendered
}

For now, I will stick with Flatcar since it's easy to migrate from CoreOS, but I would prefer to use Fedora CoreOS since it's the "official" replacement.

[ingobecker]

Using the terraform-provider-ct works fine. There are no changes of the terraform-provider-libvirt needed. Have a look at my gitlab-runner example which shows how to use it in combination with terraform-provider-ct.

[MalloZup]

thx @ingobecker . I will close then. thx!

[ingobecker]

I'm wondering if it might be useful, if i contribute a fedora coreos example to the examples folder of this repo? The only problem is, that it depends on the terraform-provider-ct which needs to be installed manually in order for someone to tryout such an example.

[MalloZup]

@ingobecker I would not mind if you want to add the example here:

https://github.com/dmacvicar/terraform-provider-libvirt/tree/master/contrib

the file would be need to be changed containing an index etc.

see my comments on this pr https://github.com/dmacvicar/terraform-provider-libvirt/pull/712

[remoe]

I try to port some coreos configurations to Fedora CoreOS. I don't know where I should post my findings. So I post it here :) One need to change mounts here:

https://github.com/dmacvicar/terraform-provider-libvirt/blob/master/examples/v0.12/coreos/qemu-agent/docker-images.mount#L1

On FCOS one can't it use this mount point. Here is one that works (not tested with sample):

    - name: var-mnt-images.mount
      enabled: true
      contents: |
        [Unit]
        Before=local-fs.target
        [Mount]
        What=qemu_docker_images
        Where=/var/mnt/images
        Options=ro,trans=virtio,version=9p2000.L
        Type=9p
        [Install]
        WantedBy=local-fs.target

[ingobecker]

@remoe Thanks. I haven't used qemu-agent because i used libvirt managed networks all the time. And since the qemu-agent part was commented out, i never look at it in detail. But you are right, that's the way to use the qemu-agent systemd units in FCOS.

@MalloZup I had a look at the discussion around the pr you mentioned. According to this statement Fedora CoreOS is the official successor of CoreOS and on May 26, 2020 CoreOS will reach its end of life(there will be no more updates). Since the examples for CoreOS are included in the examples directory i initially thought it would make sense to replace it with a Fedora CoreOS example. I would just port the already existing one including the changes @remoe proposed. It's not about showcasing a more complex usecase, i just wanted to make sure there is an usable example for Fedora CoreOS. On the other hand, i'm totally fine just contributing it to the contrib directory if this is a more appropriate location.