Hi All, I had installed kubeadm yesterday. It was all working fine. After reboot . . .

Kubernetes
#1

Ravi Paragi:
Hi All, I had installed kubeadm yesterday. It was all working fine. After rebooting instances kubelet is not coming on master node. getting below errors Any thoughts what could be the reason ? . Dec 15 17:39:32 kubemaster systemd[1]: Started kubelet: The Kubernetes Node Agent.
Dec 15 17:39:32 kubemaster kubelet[12851]: F1215 17:39:32.267276 12851 server.go:198] failed to load Kubelet config file /var/lib/kubelet/config.yaml, error failed to read kubelet config file “/var/lib/kubelet/config.yaml”, error: open /var/lib/kubelet/config.yaml: no such file or directory
Dec 15 17:39:32 kubemaster kubelet[12851]: goroutine 1 [running]:
Dec 15 17:39:32 kubemaster kubelet[12851]: http://k8s.io/kubernetes/vendor/k8s.io/klog/v2.stacks(0xc000122001|k8s.io/kubernetes/vendor/k8s.io/klog/v2.stacks(0xc000122001, 0xc000136840, 0xfb, 0x14d)
Dec 15 17:39:32 kubemaster kubelet[12851]: /workspace/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/klog/v2/klog.go:1026 +0xb9

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#2

Tej_Singh_Rana:
Hello, @Ravi Paragi
share the o/p of

$ kubectl cluster-info
#3

Ravi Paragi:
@Tej_Singh_Rana. Please find the below output.

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#4

Tej_Singh_Rana:

$ ip a
#5

Ravi Paragi:

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#6

Tej_Singh_Rana:
Share the o/p by cat command:

$ cat /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

Don’t share screenshot, just do copy/paste with triple backtick.

#7

Ravi Paragi:
vagrant@kubemaster:~$ sudo cat /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

Note: This dropin only works with kubeadm and kubelet v1.11+

[Service]
Environment=“KUBELET_KUBECONFIG_ARGS=–bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf”
Environment=“KUBELET_CONFIG_ARGS=–config=/var/lib/kubelet/config.yaml”

This is a file that “kubeadm init” and “kubeadm join” generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically

EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env

This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use

the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.

EnvironmentFile=-/etc/default/kubelet
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS

#8

Tej_Singh_Rana:
Do one thing,

$ free -m

$ systemctl daemon-reload

$ systemctl restart kubelet
#9

Tej_Singh_Rana:
Have you disabled the swap?

#10

Ravi Paragi:
vagrant@kubemaster:~$ sudo ufw status verbose
Status: inactive
vagrant@kubemaster:~$

#11

Tej_Singh_Rana:

$ free -m
#12

Tej_Singh_Rana:

controlplane $ free -m
              total        used        free      shared  buff/cache   available
Mem:           1992         768          84           1        1140        1074
Swap:             0           0           0
#13

Ravi Paragi:

vagrant@kubemaster:~$ free -m
              total        used        free      shared  buff/cache   available
Mem:           1992         260         802           0         929        1593
Swap:             0           0           0
vagrant@kubemaster:~$
#14

Tej_Singh_Rana:
Is it same for worker node in kubelet?

#15

Ravi Paragi:
yeah, its same for worker node also.

#16

Did anyone able to resolve this error. i am also seeing same issue on my newly created kubernetes cluster.