[Wolves] Kubernetes

[Adam Sweet]

Nice one James. I've no experience with Kubernetes myself and I've not
heard anyone else here talk about using it so I'm not sure we'd be much use
with it.

Glad you figured it out in the end.

Ad

On Sun, 14 Mar 2021, 18:14 James Courtier-Dutton via Wolves, <
wolves at mailman.lug.org.uk> wrote:

> Kubernetes problems solved.
> Kubernetes 1.20.2 has bugs related to btrfs and will not work with btrfs.
> Kubernates 1.20.4 has fixed those bugs and it works fine with btrfs
>
> On Sun, 14 Mar 2021 at 11:14, James Courtier-Dutton
> <james.dutton at gmail.com> wrote:
> >
> > Hi.
> >
> > After further investigations.
> > microk8s version 1.20.2  is not compatible with btrfs.
> > My problem is btrfs specific:
> > 30>1 2021-03-14T10:03:03.965578+00:00 thread microk8s.daemon-kubelet
> > 33517 - -  F0314 10:03:03.965459   33517 kubelet.go:1350] Failed to
> > start ContainerManager failed to get rootfs info: failed to get device
> > for dir "/var/snap/microk8s/common/var/lib/kubelet": could not find
> > device with major: 0, minor: 29 in cached partitions map
> >
> > Essentially, btrfs reports fs device major/minor number differently
> > from say ext4, and thus is not appearing in /proc/X/mountinfo
> > So, kubelet cannot find the mount point for a btrfs mount.
> >
> > So, my advice to people is don't use btrfs with kubernetes for now.
> >
> > Kind Regards
> >
> > James
> >
> >
> >
> > On Sat, 13 Mar 2021 at 17:46, James Courtier-Dutton
> > <james.dutton at gmail.com> wrote:
> > >
> > > Hi,
> > >
> > > I thought I would have a play with microk8s on a home pc.
> > > Suffice to say I have got nowhere fast.
> > > The initial install looked ok, but it failed to start the process that
> > > listens on port 16443. I fixed that with the command:
> > > microk8s disable ha-cluster
> > >
> > > Now it is complaining of disk problems. I.e. overlayfs not working.
> > > I have so far narrowed this down to overlayfs not being compatible
> with btrfs.
> > > Does anyone have any clues with regards to making microk8s play nicely
> > > with btrfs?
> > >
> > > It looks like containerd supports btrfs as it has a btrfs folder, but
> > > I cannot find any documentation that explains how to get it working.
> > >
> > > I am pleased that kubernetes is using just containerd now, instead of
> > > all of docker. So, at least kubernetes is getting a little less
> > > complex over time.
> > >
> > > Any help would be welcome.
> > >
> > > Kind Regards
> > >
> > > James
>
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