Starting kubelet service in FCOS fails

[Thomas Schneider]

Hi,
I have successfully installed FCOS in KVM from ISO.

For installation of K8S I run this command
sudo rpm-ostree install kubelet kubeadm kubectl

There were no issues during installation.
[core@vm192-fcos ~]$ sudo rpm-ostree install kubelet kubeadm kubectl
Checking out tree f480038... done
Enabled rpm-md repositories: updates fedora kubernetes
rpm-md repo 'updates' (cached); generated: 2020-01-21T01:02:46Z
rpm-md repo 'fedora' (cached); generated: 2019-10-23T22:52:47Z
Updating metadata for 'kubernetes'... done
rpm-md repo 'kubernetes'; generated: (invalid timestamp)
Importing rpm-md... done
Resolving dependencies... done
Will download: 10 packages (46.3MB)
Downloading from 'fedora'... done
Downloading from 'kubernetes'... done
Downloading from 'updates'... done
Importing packages... done
Checking out packages... done
Running pre scripts... done
Running post scripts... done
Running posttrans scripts... done
Writing rpmdb... done
Writing OSTree commit... done
Staging deployment... done
Added:
  conntrack-tools-1.4.5-4.fc31.x86_64
  cri-tools-1.13.0-0.x86_64
  ebtables-legacy-2.0.10-37.fc31.x86_64
  ethtool-2:5.4-1.fc31.x86_64
  kubeadm-1.17.2-0.x86_64
  kubectl-1.17.2-0.x86_64
  kubelet-1.17.2-0.x86_64
  libnetfilter_cthelper-1.0.0-16.fc31.x86_64
  libnetfilter_cttimeout-1.0.0-14.fc31.x86_64
  libnetfilter_queue-1.0.2-14.fc31.x86_64
Run "systemctl reboot" to start a reboot

After reboot I tried to start service /kubelet/, but the status shows
that the service fails to run:
[core@vm192-fcos ~]$ sudo systemctl status kubelet
* kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled;
vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/kubelet.service.d
           `-10-kubeadm.conf
   Active: activating (auto-restart) (Result: exit-code) since Wed
2020-01-22 08:03:05 UTC; 1s ago
     Docs: https://kubernetes.io/docs/
  Process: 2592 ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS
$KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS
(code=exited, status=255/EXCEPTION)
 Main PID: 2592 (code=exited, status=255/EXCEPTION)

Can you please advise why the service is not starting?
Is the procedure for installation of K8S incorrect?

THX

[Dusty Mabe]

On 1/22/20 3:07 AM, Thomas Schneider wrote:
> Can you please advise why the service is not starting?
> Is the procedure for installation of K8S incorrect?

Hey Thomas,

Unfortunately we don't have a good story for installing K8S on Fedora
CoreOS right now. Some people have done it themselves, but we don't have
any published or recommended way to do it right now. We have concentrated
on getting the OS out the door and now we can start to bite off some of
these higher level goals.

Here is an issue you can follow where we are having discussions about this
topic: https://github.com/coreos/fedora-coreos-tracker/issues/93

Dusty

R: Re: Starting kubelet service in FCOS fails

[Domenico Viggiani]

Just as an anecdote.

We are still using "old" CoreOS as base OS for Mesosphere DC/OS stack, with excellent results.
Now I learned that it has become officially unsupported, surely because now CoreOS is in a kind of no man's land.

We hope that it will become soon a solid and well defined product, to use as modern OS for Mesos, K8s and other container platform.

Bye

________________________________
Da: Dusty Mabe 
Inviato: mercoledì 29 gennaio 2020 19:19
A: Thomas Schneider ; [e-mail] 
Oggetto: [CoreOS] Re: Starting kubelet service in FCOS fails

On 1/22/20 3:07 AM, Thomas Schneider wrote:
> Can you please advise why the service is not starting?
> Is the procedure for installation of K8S incorrect?

Hey Thomas,

Unfortunately we don't have a good story for installing K8S on Fedora
CoreOS right now. Some people have done it themselves, but we don't have
any published or recommended way to do it right now. We have concentrated
on getting the OS out the door and now we can start to bite off some of
these higher level goals.

Here is an issue you can follow where we are having discussions about this
topic: https://github.com/coreos/fedora-coreos-tracker/issues/93

Dusty
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