kubernetes命令--小知识_kubelet.service holdoff time over, scheduling rest-优快云博客

本文链接：https://blog.youkuaiyun.com/BigData_Mining/article/details/87896882

本文记录了一次Kubernetes集群中kubelet服务启动失败的问题排查过程，详细展示了错误日志与网络状态检查，同时提供了部署、管理Kubernetes应用的YAML配置操作指南。

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启动kubelet报错：

2月 23 20:13:26 qyh_master kubelet[5738]: F0223 20:13:26.360338    5738 server.go:154] unknown command:
2月 23 20:13:26 qyh_master systemd[1]: kubelet.service: Service hold-off time over, scheduling restart.
2月 23 20:13:26 qyh_master systemd[1]: kubelet.service: Scheduled restart job, restart counter is at 5.
2月 23 20:13:26 qyh_master systemd[1]: Stopped Kubernetes Kubelet.
2月 23 20:13:26 qyh_master systemd[1]: kubelet.service: Start request repeated too quickly.
2月 23 20:13:26 qyh_master systemd[1]: kubelet.service: Failed with result 'exit-code'.
2月 23 20:13:26 qyh_master systemd[1]: Failed to start Kubernetes Kubelet.

qyh@qyh_master:/home/kubernetes/work$ kubectl get ns
NAME          STATUS   AGE
default       Active   8h
kube-public   Active   8h
kube-system   Active   8h

查看网络：
qyh@qyh_master:/home/kubernetes/kube_app$ ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: wlp58s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 50:5b:c2:d6:ff:bb brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.20/24 brd 192.168.1.255 scope global dynamic noprefixroute wlp58s0
       valid_lft 248186sec preferred_lft 248186sec
    inet6 fe80::f1be:7366:6213:7d90/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:fd:8e:2d:f4 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever

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https://github.com/xiaojiaqi/k8seasy_release_page

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YAML配置文件管理对象
对象管理：
# 创建deployment资源
kubectl create -f nginx-deployment.yaml
# 查看deployment
kubectl get deploy
# 查看ReplicaSet
kubectl get rs
# 查看pods所有标签
kubectl get pods --show-labels
# 根据标签查看pods
kubectl get pods -l app=nginx
# 滚动更新镜像
kubectl set image deployment/nginx-deployment nginx=nginx:1.11
或者
kubectl edit deployment/nginx-deployment
或者
kubectl apply -f nginx-deployment.yaml
# 实时观察发布状态：
kubectl rollout status deployment/nginx-deployment
# 查看deployment历史修订版本
kubectl rollout history deployment/nginx-deployment
kubectl rollout history deployment/nginx-deployment --revision=3
# 回滚到以前版本
kubectl rollout undo deployment/nginx-deployment
kubectl rollout undo deployment/nginx-deployment --to-revision=3
# 扩容deployment的Pod副本数量
kubectl scale deployment nginx-deployment --replicas=10
# 设置启动扩容/缩容
kubectl autoscale deployment nginx-deployment --min=10 --max=15 --cpu-percent=80

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拉取镜像策略：