Failed to enable dns

I’m on Arch. I was able to install snap and the microk8s snap ok. I can enable registry, but when I try to enable dns I get this.

❯ sudo microk8s.enable dns
Enabling DNS
Applying manifest
serviceaccount/coredns created
configmap/coredns created
deployment.apps/coredns created
service/kube-dns created
clusterrole.rbac.authorization.k8s.io/coredns created
clusterrolebinding.rbac.authorization.k8s.io/coredns created
Restarting kubelet
systemctl: /snap/microk8s/1247/usr/lib/x86_64-linux-gnu/libp11-kit.so.0: no version information available (required by /usr/lib/systemd/libsystemd-shared-245.so)
systemctl: symbol lookup error: /usr/lib/systemd/libsystemd-shared-245.so: undefined symbol: p11_kit_uri_get_slot_info, version LIBP11_KIT_1.0
Failed to enable dns

It looks like my systemd libs are mismatched with the libp11-kit libs in the container. I have arch’s p11-kit and libp11-kit packages both installed and up to date.

Please run microk8s.inspect and attach the generated tarball to this issue.

[ktsakalozos]

The PR with the fix is merged. The snap on the edge channel should be available within the next few hours. Try it with:

sudo snap install microk8s --classic --channel=edge

The Patch should reach stable with the 1.18.3 release.

Thank you all for helping in fixing this.

[bmoller]

OK, the problem lies here:

https://github.com/ubuntu/microk8s/blob/master/microk8s-resources/actions/common/utils.sh#L70

When microk8s is invoking sudo, it’s modifying the linker paths to only look in its container. Previously, with versions <= 1.15 the scripts just invoked sudo directly without any wrapper function or environment modification. You can see where it changed the kubelet restart at the end of this file in this commit:

https://github.com/ubuntu/microk8s/blob/36f79886a074167a0972a19cc14b134bef5a1bd8/microk8s-resources/actions/enable.dns.sh

So, the workaround is to simply perform these steps manually:

1. Copy the microk8s DNS manifest from /var/lib/snapd/snap/microk8s/current/actions/dns.yaml to a temporary location
2. Edit the manifest, replacing all occurrences of $ARCH with your native architecture (most likely amd64
3. Apply the manifest with microk8s kubectl or your own kubectl binary with these args: microk8s kubectl --kubeconfig=/var/snap/microk8s/current/credentials/client.config apply -f dns.yaml
4. Edit the kubelet arguments file located at /var/snap/microk8s/current/args/kubelet, adding these lines:

--cluster-domain=cluster.local
--cluster-dns=10.152.183.10

1. Restart kubelet via systemd: sudo systemctl restart snap.microk8s.daemon-kubelet.service
2. Congratulate yourself for doing microk8s’ work for it!

However, you’ll still get microk8s status reporting that DNS is not enabled. I found why, but it’s 3 AM and I’ll open a bug report after some sleep.