Kubernetes中查看日志的方法

一、查看集群事件

[root@master01 ~]# kubectl get events
LAST SEEN   TYPE      REASON                    OBJECT                                                MESSAGE
45s         Normal    CREATE                    ingress/example-ingress                               Ingress default/example-ingress
      node/master01               

二、kubectl  describe 来查看节点或者pod的日志

[root@master01 ~]# kubectl describe node master01
Name:               master01
Roles:              master
Labels:             beta.kubernetes.io/arch=amd64
                    beta.kubernetes.io/os=linux
                    kubernetes.io/arch=amd64
                    kubernetes.io/hostname=master01
                    kubernetes.io/os=linux
                    node-role.kubernetes.io/master=
Annotations:        kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock
                    node.alpha.kubernetes.io/ttl: 0
                    projectcalico.org/IPv4Address: 192.168.43.90/24
                    projectcalico.org/IPv4IPIPTunnelAddr: 10.224.241.64
                    volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp:  Thu, 25 May 2023 10:10:15 +0800
Taints:             node-role.kubernetes.io/master:NoSchedule
Unschedulable:      false

查看pod

[root@master01 ~]# kubectl describe pod maria-6d46559b5c-tjhfb
Name:           maria-6d46559b5c-tjhfb
Namespace:      default
Priority:       0
Node:           <none>
Labels:         app=maria
                pod-template-hash=6d46559b5c
Annotations:    <none>
Status:         Pending
IP:             
IPs:            <none>
Controlled By:  ReplicaSet/maria-6d46559b5c

三、kubectl  logs查看pod日志

[root@master01 ~]# kubectl logs  -f weave-scope-cluster-agent-myui-75859b9bc4-8wgbz
time="2023-09-07T03:17:23Z" level=info msg="publishing to: myui-weave-scope.default.svc:80"
<probe> INFO: 2023/09/07 03:17:23.710375 Basic authentication disabled
<probe> INFO: 2023/09/07 03:17:38.861462 command line args: --mode=probe --probe-only=true --probe.kubernetes.role=cluster myui-weave-scope.default.svc:80
<probe> INFO: 2023/09/07 03:17:38.861515 probe starting, version 1.12.0, ID 69b7e92b5eaf4c03
<probe> ERRO: 2023/09/07 03:17:38.862176 Error getting docker bridge ip: route ip+net: no such network interface

--tail  参数查看最后日志

[root@master01 ~]# kubectl logs --tail 100   weave-scope-cluster-agent-myui-75859b9bc4-8wgbz
time="2023-09-07T03:17:23Z" level=info msg="publishing to: myui-weave-scope.default.svc:80"
<probe> INFO: 2023/09/07 03:17:23.710375 Basic authentication disabled
<probe> INFO: 2023/09/07 03:17:38.861462 command line args: --mode=probe --probe-only=true --probe.kubernetes.role=cluster myui-weave-scope.default.svc:80
<probe> INFO: 2023/09/07 03:17:38.861515 probe starting, version 1.12.0, ID 69b7e92b5eaf4c03
<probe> ERRO: 2023/09/07 03:17:38.862176 Error getting docker bridge ip: route ip+net: no such network interface
<probe> INFO: 2023/09/07 03:17:38.876678 kubernetes: targeting api server https://10.96.0.1:443
<probe> ERRO: 2023/09/07 03:17:38.902146 plugins: problem loading: no such file or directory

--since=1h查看最近一小时的日志

[root@master01 ~]# kubectl logs --since=1h   weave-scope-cluster-agent-myui-75859b9bc4-8wgbz

四、journalctl查看系统组件的日志

[root@master01 ~]# journalctl -u kubelet
-- Logs begin at Thu 2023-09-07 11:14:07 CST, end at Thu 2023-09-07 11:36:57 CST. --
Sep 07 11:14:33 master01 systemd[1]: Started kubelet: The Kubernetes Node Agent.
Sep 07 11:14:52 master01 kubelet[748]: Flag --cgroup-driver has been deprecated, This parameter shoul
Sep 07 11:14:52 master01 kubelet[748]: Flag --cgroup-driver has been deprecated, This parameter shoul
Sep 07 11:14:54 master01 kubelet[748]: Flag --cgroup-driver has been deprecated, This parameter shoul
Sep 07 11:14:54 master01 kubelet[748]: Flag --cgroup-driver has been deprecated, This parameter shoul
Sep 07 11:14:54 master01 kubelet[748]: I0907 11:14:54.549551     748 server.go:417] Version: v1.18.0
Sep 07 11:14:54 master01 kubelet[748]: I0907 11:14:54.578569     748 plugins.go:100] No cloud provide
Sep 07 11:14:54 master01 kubelet[748]: I0907 11:14:54.593792     748 server.go:837] Client rotation i
Sep 07 11:14:54 master01 kubelet[748]: I0907 11:14:54.784634     748 certificate_store.go:130] Loadin
Sep 07 11:15:35 master01 kubelet[748]: I0907 11:15:35.578321     748 server.go:646] --cgroups-per-qos

查看其他组件

[root@master01 ~]# journalctl -u kube-apiserver
[root@master01 ~]# journalctl -u kube-etcd
[root@master01 ~]# journalctl -u kube-apiserver