k8s安装遇到错误： failed to load Kubelet config file /var/lib/kubelet/config.yaml, error failed to read kub
安装完kube后启动一直启动失败
安装：
yum install docker-ce kubelet-1.11.1 kubeadm-1.11.1 kubectl-1.11.1 kubernetes-cni启动kubelet失败
sysemctl status kubelet.service
bash: sysemctl: command not found...
[root@localhost rpm]# systemctl status kubelet.service
● kubelet.service - kubelet: The Kubernetes Node Agent
Loaded: loaded (/etc/systemd/system/kubelet.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/kubelet.service.d
└─10-kubeadm.conf
Active: activating (auto-restart) (Result: exit-code) since Thu 2021-06-24 23:36:56 PDT; 8s ago
Docs: http://kubernetes.io/docs/
Process: 25734 ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS (code=exited, status=255)
Main PID: 25734 (code=exited, status=255)
查看/var/log/messages有报错信息：
failed to load Kubelet config file /var/lib/kubelet/config.yaml, error failed to read kub
[root@localhost rpm]# tail -100f /var/log/messages|grep kube
Jun 24 23:35:39 localhost kubelet: F0624 23:35:39.190803 25600 server.go:190] 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
Jun 24 23:35:39 localhost systemd: kubelet.service: main process exited, code=exited, status=255/n/a
Jun 24 23:35:39 localhost systemd: Unit kubelet.service entered failed state.
Jun 24 23:35:39 localhost systemd: kubelet.service failed.
Jun 24 23:35:49 localhost systemd: kubelet.service holdoff time over, scheduling restart.
Jun 24 23:35:49 localhost systemd: Started kubelet: The Kubernetes Node Agent.
Jun 24 23:35:49 localhost systemd: Starting kubelet: The Kubernetes Node Agent...
原因是没有还需要执行：
kubeadm init
kubeadm init
[init] using Kubernetes version: v1.11.10
[preflight] running pre-flight checks
[WARNING Firewalld]: firewalld is active, please ensure ports [6443 10250] are open or your cluster may not function correctly
I0624 23:38:43.919869 26010 kernel_validator.go:81] Validating kernel version
I0624 23:38:43.919941 26010 kernel_validator.go:96] Validating kernel config
[WARNING SystemVerification]: docker version is greater than the most recently validated version. Docker version: 17.12.1-ce. Max validated version: 17.03
[preflight/images] Pulling images required for setting up a Kubernetes cluster
[preflight/images] This might take a minute or two, depending on the speed of your internet connection
[preflight/images] You can also perform this action in beforehand using 'kubeadm config images pull'
[kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[preflight] Activating the kubelet service
[certificates] Generated ca certificate and key.
[certificates] Generated apiserver certificate and key.
[certificates] apiserver serving cert is signed for DNS names [localhost.localdomain kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.242.134]
[certificates] Generated apiserver-kubelet-client certificate and key.
[certificates] Generated sa key and public key.
[certificates] Generated front-proxy-ca certificate and key.
[certificates] Generated front-proxy-client certificate and key.
[certificates] Generated etcd/ca certificate and key.
[certificates] Generated etcd/server certificate and key.
[certificates] etcd/server serving cert is signed for DNS names [localhost.localdomain localhost] and IPs [127.0.0.1 ::1]
[certificates] Generated etcd/peer certificate and key.
[certificates] etcd/peer serving cert is signed for DNS names [localhost.localdomain localhost] and IPs [192.168.242.134 127.0.0.1 ::1]
[certificates] Generated etcd/healthcheck-client certificate and key.
[certificates] Generated apiserver-etcd-client certificate and key.
[certificates] valid certificates and keys now exist in "/etc/kubernetes/pki"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"
[controlplane] wrote Static Pod manifest for component kube-apiserver to "/etc/kubernetes/manifests/kube-apiserver.yaml"
[controlplane] wrote Static Pod manifest for component kube-controller-manager to "/etc/kubernetes/manifests/kube-controller-manager.yaml"
[controlplane] wrote Static Pod manifest for component kube-scheduler to "/etc/kubernetes/manifests/kube-scheduler.yaml"
[etcd] Wrote Static Pod manifest for a local etcd instance to "/etc/kubernetes/manifests/etcd.yaml"
[init] waiting for the kubelet to boot up the control plane as Static Pods from directory "/etc/kubernetes/manifests"
[init] this might take a minute or longer if the control plane images have to be pulled
[apiclient] All control plane components are healthy after 42.002696 seconds
[uploadconfig] storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.11" in namespace kube-system with the configuration for the kubelets in the cluster
[markmaster] Marking the node localhost.localdomain as master by adding the label "node-role.kubernetes.io/master=''"
[markmaster] Marking the node localhost.localdomain as master by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[patchnode] Uploading the CRI Socket information "/var/run/dockershim.sock" to the Node API object "localhost.localdomain" as an annotation
[bootstraptoken] using token: dm3ejo.5by2vqehgnitw57z
[bootstraptoken] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstraptoken] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstraptoken] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstraptoken] creating the "cluster-info" ConfigMap in the "kube-public" namespace
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
Your Kubernetes master has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
You can now join any number of machines by running the following on each node
as root:
kubeadm join 192.168.242.134:6443 --token dm3ejo.5by2vqehgnitw57z --discovery-token-ca-cert-hash sha256:0c74518eaafab13fc378649a9dad4e92d3bed22ede297651b3fe9f8a56db374d
之后会生成：
[root@localhost rpm]# cd /var/lib/kubelet/
[root@localhost kubelet]# ls -l
total 12
-rw-r--r--. 1 root root 1609 Jun 24 23:40 config.yaml
-rw-r--r--. 1 root root 40 Jun 24 23:40 cpu_manager_state
drwxr-xr-x. 2 root root 61 Jun 24 23:41 device-plugins
-rw-r--r--. 1 root root 124 Jun 24 23:40 kubeadm-flags.env
drwxr-xr-x. 2 root root 170 Jun 24 23:41 pki
drwx------. 2 root root 6 Jun 24 23:40 plugin-containers
drwxr-x---. 2 root root 6 Jun 24 23:40 plugins
drwxr-x---. 7 root root 210 Jun 24 23:41 pods
[root@localhost kubelet]#
再启动 就会正常
root@localhost kubelet]# systemctl status kubelet.service
● kubelet.service - kubelet: The Kubernetes Node Agent
Loaded: loaded (/etc/systemd/system/kubelet.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/kubelet.service.d
└─10-kubeadm.conf
Active: active (running) since Thu 2021-06-24 23:40:36 PDT; 4min 31s ago
Docs: http://kubernetes.io/docs/
Main PID: 26379 (kubelet)
Memory: 40.1M
CGroup: /system.slice/kubelet.service
└─26379 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf --config=/var/lib/kubele...
Jun 24 23:44:46 localhost.localdomain kubelet[26379]: W0624 23:44:46.705701 26379 cni.go:172] Unable to update cni config: No networks found in /etc/cni/net.d
Jun 24 23:44:46 localhost.localdomain kubelet[26379]: E0624 23:44:46.705816 26379 kubelet.go:2110] Container runtime network not ready: NetworkReady=fals...itialized
Jun 24 23:44:51 localhost.localdomain kubelet[26379]: W0624 23:44:51.706635 26379 cni.go:172] Unable to update cni config: No networks found in /etc/cni/net.d
Jun 24 23:44:51 localhost.localdomain kubelet[26379]: E0624 23:44:51.706743 26379 kubelet.go:2110] Container runtime network not ready: NetworkReady=fals...itialized
Jun 24 23:44:56 localhost.localdomain kubelet[26379]: W0624 23:44:56.708389 26379 cni.go:172] Unable to update cni config: No networks found in /etc/cni/net.d
Jun 24 23:44:56 localhost.localdomain kubelet[26379]: E0624 23:44:56.708506 26379 kubelet.go:2110] Container runtime network not ready: NetworkReady=fals...itialized
Jun 24 23:45:01 localhost.localdomain kubelet[26379]: W0624 23:45:01.710355 26379 cni.go:172] Unable to update cni config: No networks found in /etc/cni/net.d
Jun 24 23:45:01 localhost.localdomain kubelet[26379]: E0624 23:45:01.710556 26379 kubelet.go:2110] Container runtime network not ready: NetworkReady=fals...itialized
Jun 24 23:45:06 localhost.localdomain kubelet[26379]: W0624 23:45:06.712081 26379 cni.go:172] Unable to update cni config: No networks found in /etc/cni/net.d
Jun 24 23:45:06 localhost.localdomain kubelet[26379]: E0624 23:45:06.712241 26379 kubelet.go:2110] Container runtime network not ready: NetworkReady=fals...itialized
Hint: Some lines were ellipsized, use -l to show in full.
[root@localhost kubelet]#