k8s中查看pod在宿主机上对应的网卡，模拟pod网络故障

最新推荐文章于 2025-12-25 15:42:08 发布

原创最新推荐文章于 2025-12-25 15:42:08 发布 · 497 阅读

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文章标签：

#kubernetes #容器 #云原生

思路：找到pod在宿主机上对应的网卡，禁用网卡

1.查看pod内网卡名称以及pod在宿主机上网卡对应的序号

[root@k8smaster173 ~]# kubectl get pod -n default -o wide
NAME                          READY   STATUS    RESTARTS   AGE   IP             NODE        NOMINATED NODE   READINESS GATES
mysqlha-sample-172-16-23-11   5/5     Running   5          39d   172.16.23.11   k8snodexx  <none>           <none>
mysqlha-sample-172-16-23-12   5/5     Running   0          39d   172.16.23.12   k8snodemm   <none>           <none>
[root@k8smasterxx~]# kubectl exec -ti -n default mysqlha-sample-172-16-23-11 bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.
Defaulting container name to mysql.
Use 'kubectl describe pod/mysqlha-sample-172-16-23-11 -n default' to see all of the containers in this pod.
#（如果有，使用此命令就可以），查看pod 内网卡的设备
root@mysqlha-sample-172-16-23-11:/# ifconfig
bash: ifconfig: command not found
root@mysqlha-sample-172-16-23-11:/# ifconfig
bash: ifconfig: command not found
#在pod中执行如下命令，查看pod 在宿主机上网卡对应的序号
root@mysqlha-sample-172-16-23-11:/# cat /sys/class/net/eth0/iflink 
15
root@mysqlha-sample-172-16-23-11:/#

2.根据pod 在宿主机上网卡对应的序号，找到其对应的网卡

如下网卡序号后面的字符串就是网卡的名

15: cali2bbe523b616@if4 网卡名称为：cali2bbe523b616

#登录到pod所在node上，找到步骤1查询到的网卡序号对应的网卡
[root@k8smaster173 ~]# ssh k8snode70
Last login: Wed Aug 21 06:12:02 2024 from k8snode73
[root@k8snodexx ~]# 
[root@k8snodexx ~]# ip a |grep "15: " -A 5
15: cali2bbe523b616@if4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1440 qdisc noqueue state UP group default 
    link/ether ee:ee:ee:ee:ee:ee brd ff:ff:ff:ff:ff:ff link-netnsid 7
    inet6 fe80::ecee:eeff:feee:eeee/64 scope link 
       valid_lft forever preferred_lft forever
17: cali066a8098287@if4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1440 qdisc noqueue state UP group default 
    link/ether ee:ee:ee:ee:ee:ee brd ff:ff:ff:ff:ff:ff link-netnsid 4

3.在宿主机上禁用/启用pod 对应的网卡

ip line set <网卡接口> down

在宿主机上启用pod 对应的网卡

ip line set <网卡接口> down

参考:https://blog.youkuaiyun.com/ss810540895/article/details/132345449