K8s deployment problems I met

lufy

March 16, 2022

systemctl start kubelet failed, journalctl -xeu kubelet show the fail message:
Failed to run kubelet" err="failed to run Kubelet: misconfiguration: kubelet cgroup&gt;
The whole log should be
misconfiguration: kubelet cgroup driver: "cgroupfs" is different from docker cgroup driver: "systemd"
I learn from <a href="https://github.com/kubernetes/kubernetes/issues/43805">https://github.com/kubernetes/kubernetes/issues/43805</a>
and change docker cgroup to systemd by editing /usr/lib/systemd/system/docker.service, add --exec-opt native.cgroupdriver=systemd after the dockerd cmdline.
Then systemctl daemon-reload; systemctl start kubelet successfully.
By the way, docker info | grep -i cgorup whould show what cgroup driver docker is using.
&nbsp;
Node not ready, reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
This is about I need a network plugin. By reading from
<a href="https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/">https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/</a>
and
<a href="https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/">https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/</a>
and execute the installation steps from
<a href="https://projectcalico.docs.tigera.io/getting-started/kubernetes/quickstart">https://projectcalico.docs.tigera.io/getting-started/kubernetes/quickstart</a>
I still get the NotReady message. Finally I found it's that I have not get the meaning. The quickstart say: &nbsp;you may need to change the default IP pool CIDR to match your pod network CIDR, which I have missed.
So I wget&nbsp; <code id="codeblock-4"><a href="https://projectcalico.docs.tigera.io/manifests/custom-resources.yaml">https://projectcalico.docs.tigera.io/manifests/custom-resources.yaml</a> and edit the cidr, then after waiting about 20min, I observed the nodes are all ready.</code>
<code></code>
k logs -p -n kubeapps kubeapps-internal-apprepository-controller-685685876b-kk2kl met
Error from server: Get "https://192.168.0.204:10250/containerLogs/kubeapps/kubeapps-internal-apprepository-controller-685685876b-kk2kl/controller?previous=true": dial tcp 192.168.0.204:10250: i/o timeout
I already checked firewalld was disabled.
Some said flush iptables would work, but not really worked for me by:
<pre><code class="language-shell hljs">systemctl stop kubelet </code><code class="language-shell hljs">systemctl stop docke</code><code class="language-shell hljs"> iptables --flush
iptables -tnat --flush </code><code id="copy_target_1" class="language-shell hljs">systemctl start docker systemctl start kubelet I solved this by re-stop firewalld with: systemctl start firewalld ## here met unit file firewalld.service is masked, solved by systemctl unmask firewalld firewall-cmd --add-port=10250/tcp ## then kubectl logs appears ok. systemctl stop firewalld ## also, kubectl logs worked fine. I think it's that iptables not flushed correctly. I finally find out the reason of -- Why kubectl logs ok while re-stop firewalld but failed when os reboot: when os reboot, iptables rules is just the same as when you disable firewalld. The rules added before disabling firewalld cannot be saved. The differences hided in /etc/sysconfig/nftables.conf or /etc/sysconfig/iptables-config And I solved this by empty /etc/sysconfig/nftables.conf by echo &gt; /etc/sysconfig/nftables.conf</code><code id="copy_target_1" class="language-shell hljs"></code></pre>
<pre><code id="copy_target_1" class="language-shell hljs"></code> </pre>
<pre><code id="copy_target_1" class="language-shell hljs"></code></pre>

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