Please support to tell the reason why Kubelet is giving error. I used the below command to initialize the Cluster and logs can be seen below alongwith it:
vagrant@master-1:~$ sudo kubeadm init --pod-network-cidr=10.244.0.0/16
[init] Using Kubernetes version: v1.22.0
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local master-1] and IPs [10.96.0.1 10.0.2.15]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [localhost master-1] and IPs [10.0.2.15 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [localhost master-1] and IPs [10.0.2.15 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[kubelet-check] Initial timeout of 40s passed.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp 127.0.0.1:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp 127.0.0.1:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp 127.0.0.1:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp 127.0.0.1:10248: connect: connection refused.
Logs of Kubelet:
vagrant@master-1:~$ sudo journalctl -xeu kubelet
-- Automatic restarting of the unit kubelet.service has been scheduled, as the result for
-- the configured Restart= setting for the unit.
Aug 15 13:09:02 master-1 systemd[1]: Stopped kubelet: The Kubernetes Node Agent.
-- Subject: Unit kubelet.service has finished shutting down
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit kubelet.service has finished shutting down.
Aug 15 13:09:02 master-1 systemd[1]: Started kubelet: The Kubernetes Node Agent.
-- Subject: Unit kubelet.service has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit kubelet.service has finished starting up.
--
-- The start-up result is RESULT.
Aug 15 13:09:02 master-1 kubelet[30031]: Flag --network-plugin has been deprecated, will be removed along with dockershim.
Aug 15 13:09:02 master-1 kubelet[30031]: Flag --network-plugin has been deprecated, will be removed along with dockershim.
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.660104 30031 server.go:440] "Kubelet version" kubeletVersion="v1.22.0"
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.660677 30031 server.go:868] "Client rotation is on, will bootstrap in background"
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.663250 30031 certificate_store.go:130] Loading cert/key pair from "/var/lib/kubelet/pki/kubelet-clie
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.664501 30031 dynamic_cafile_content.go:155] "Starting controller" name="client-ca-bundle::/etc/kuber
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.691644 30031 server.go:687] "--cgroups-per-qos enabled, but --cgroup-root was not specified. defaul
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.691838 30031 container_manager_linux.go:280] "Container manager verified user specified cgroup-root
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.691906 30031 container_manager_linux.go:285] "Creating Container Manager object based on Node Config
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.692345 30031 topology_manager.go:133] "Creating topology manager with policy per scope" topologyPoli
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.692363 30031 container_manager_linux.go:320] "Creating device plugin manager" devicePluginEnabled=tr
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.692392 30031 state_mem.go:36] "Initialized new in-memory state store"
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.692436 30031 kubelet.go:314] "Using dockershim is deprecated, please consider using a full-fledged C
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.692457 30031 client.go:78] "Connecting to docker on the dockerEndpoint" endpoint="unix:///var/run/do
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.692472 30031 client.go:97] "Start docker client with request timeout" timeout="2m0s"
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.693852 30031 docker_service.go:566] "Hairpin mode is set but kubenet is not enabled, falling back to
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.693877 30031 docker_service.go:242] "Hairpin mode is set" hairpinMode=hairpin-veth
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.693959 30031 cni.go:239] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.697309 30031 cni.go:239] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.697541 30031 cni.go:239] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.697445 30031 docker_service.go:257] "Docker cri networking managed by the network plugin" networkPlu
Aug 15 13:09:02 master-1 kubelet[30031]: I0815 13:09:02.705599 30031 docker_service.go:264] "Docker Info" dockerInfo=&{ID:FRX6:6KMG:I4JN:FL7C:UD2H:VLP4:7DOP
Aug 15 13:09:02 master-1 kubelet[30031]: E0815 13:09:02.706027 30031 server.go:294] "Failed to run kubelet" err="failed to run Kubelet: misconfiguration: ku
Aug 15 13:09:02 master-1 systemd[1]: kubelet.service: Main process exited, code=exited, status=1/FAILURE
Aug 15 13:09:02 master-1 systemd[1]: kubelet.service: Failed with result 'exit-code'.
@mmumshad I followed the lecture exactly on setting up cluster using kubeadm and even in the exercise lab, i am getting the same error. Please help.