查看node節點發現node3是NotReady狀態

[root@k8s-node01 ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION k8s-node01 Ready control-plane,master 28d v1.21.2 k8s-node02 Ready <none> 28d v1.21.2 k8s-node03 NotReady <none> 28d v1.21.2 k8s-node04 Ready <none> 28d v1.21.2 k8s-node05 Ready <none> 28d v1.21.2

查看日志發現是swap沒關

[root@k8s-node03 ~]# journalctl -f -u kubelet -- Logs begin at 日 2021-05-23 00:20:29 CST. -- 8月 10 01:05:08 k8s-node03 kubelet[4408]: Flag --network-plugin has been deprecated, will be removed along with dockershim. 8月 10 01:05:08 k8s-node03 kubelet[4408]: I0810 01:05:08.774223 4408 server.go:440] "Kubelet version" kubeletVersion="v1.21.2" 8月 10 01:05:08 k8s-node03 kubelet[4408]: I0810 01:05:08.775361 4408 server.go:851] "Client rotation is on, will bootstrap in background" 8月 10 01:05:08 k8s-node03 kubelet[4408]: I0810 01:05:08.843965 4408 certificate_store.go:130] Loading cert/key pair from "/var/lib/kubelet/pki/kubelet-client-current.pem". 8月 10 01:05:08 k8s-node03 kubelet[4408]: I0810 01:05:08.848600 4408 dynamic_cafile_content.go:167] Starting client-ca-bundle::/etc/kubernetes/pki/ca.crt 8月 10 01:05:09 k8s-node03 kubelet[4408]: I0810 01:05:09.157192 4408 server.go:660] "--cgroups-per-qos enabled, but --cgroup-root was not specified. defaulting to /" 8月 10 01:05:09 k8s-node03 kubelet[4408]: E0810 01:05:09.157586 4408 server.go:292] "Failed to run kubelet" err="failed to run Kubelet: running with swap on is not supported, please disable swap! or set --fail-swap-on flag to false. /proc/swaps contained: [Filename\t\t\t\tType\t\tSize\tUsed\tPriority /dev/dm-1 partition\t2097148\t1280\t-2]" 8月 10 01:05:09 k8s-node03 systemd[1]: kubelet.service: main process exited, code=exited, status=1/FAILURE 8月 10 01:05:09 k8s-node03 systemd[1]: Unit kubelet.service entered failed state. 8月 10 01:05:09 k8s-node03 systemd[1]: kubelet.service failed. 8月 10 01:05:19 k8s-node03 systemd[1]: kubelet.service holdoff time over, scheduling restart. 8月 10 01:05:19 k8s-node03 systemd[1]: Stopped kubelet: The Kubernetes Node Agent. 8月 10 01:05:19 k8s-node03 systemd[1]: Started kubelet: The Kubernetes Node Agent. 8月 10 01:05:19 k8s-node03 kubelet[4480]: Flag --network-plugin has been deprecated, will be removed along with dockershim. 8月 10 01:05:19 k8s-node03 kubelet[4480]: Flag --network-plugin has been deprecated, will be removed along with dockershim. 8月 10 01:05:19 k8s-node03 kubelet[4480]: I0810 01:05:19.486095 4480 server.go:440] "Kubelet version" kubeletVersion="v1.21.2" 8月 10 01:05:19 k8s-node03 kubelet[4480]: I0810 01:05:19.486746 4480 server.go:851] "Client rotation is on, will bootstrap in background" 8月 10 01:05:19 k8s-node03 kubelet[4480]: I0810 01:05:19.517364 4480 certificate_store.go:130] Loading cert/key pair from "/var/lib/kubelet/pki/kubelet-client-current.pem". 8月 10 01:05:19 k8s-node03 kubelet[4480]: I0810 01:05:19.532697 4480 dynamic_cafile_content.go:167] Starting client-ca-bundle::/etc/kubernetes/pki/ca.crt 8月 10 01:05:19 k8s-node03 kubelet[4480]: I0810 01:05:19.782954 4480 server.go:660] "--cgroups-per-qos enabled, but --cgroup-root was not specified. defaulting to /" 8月 10 01:05:19 k8s-node03 kubelet[4480]: E0810 01:05:19.783965 4480 server.go:292] "Failed to run kubelet" err="failed to run Kubelet: running with swap on is not supported, please disable swap! or set --fail-swap-on flag to false. /proc/swaps contained: [Filename\t\t\t\tType\t\tSize\tUsed\tPriority /dev/dm-1 partition\t2097148\t1280\t-2]" 8月 10 01:05:19 k8s-node03 systemd[1]: kubelet.service: main process exited, code=exited, status=1/FAILURE 8月 10 01:05:19 k8s-node03 systemd[1]: Unit kubelet.service entered failed state. 8月 10 01:05:19 k8s-node03 systemd[1]: kubelet.service failed. 8月 10 01:05:29 k8s-node03 systemd[1]: kubelet.service holdoff time over, scheduling restart. 8月 10 01:05:29 k8s-node03 systemd[1]: Stopped kubelet: The Kubernetes Node Agent. 8月 10 01:05:29 k8s-node03 systemd[1]: Started kubelet: The Kubernetes Node Agent.

關閉swap

[root@k8s-node03 ~]# swapoff -a

再次查看節點狀態

[root@k8s-node01 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-node01 Ready control-plane,master 28d v1.21.2
k8s-node02 Ready 28d v1.21.2
k8s-node03 Ready 28d v1.21.2
k8s-node04 Ready 28d v1.21.2
k8s-node05 Ready 28d v1.21.2

總結

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