k8s中找出pod在node节点上对应的网卡名称

创建pod

# 先通过yaml文件创建pod
root@k8s-master-51:~# vim nginx.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  namespace: myserver
spec:
  replicas: 2
  selector:
    #app: ng-deploy-80 #rc
    matchLabels: 
      app: ng-deploy-80
  template:
    metadata:
      labels:
        app: ng-deploy-80
    spec:
      containers:
      - name: ng-deploy-80
        image: 172.20.17.24/base-image/nginx:1.27.4
        ports:
        - containerPort: 80
        
root@k8s-master-51:~# kubectl apply -f nginx.yaml  

查看pod运行状态 
root@k8s-master-51:~# kubectl get pod  -o wide -n myserver 
NAME                                READY   STATUS    RESTARTS   AGE   IP              NODE          NOMINATED NODE   READINESS GATES
nginx-deployment-55fb9b765f-jhkv5   1/1     Running   0          5s   10.200.229.77   k8s-node-55   <none>           <none>
nginx-deployment-55fb9b765f-lb7h6   1/1     Running   0          5s   10.200.22.143   k8s-node-54   <none>           <none>

进入pod里

进到pod里安装好ethtool net-tools这两个工具后续用到

root@k8s-master-51 # kubectl exec -it nginx-deployment-55fb9b765f-lb7h6 -n myserver -- /bin/bash 
# 修改apt源改成国内源
root@nginx-deployment-55fb9b765f-lb7h6:/# cd /etc/apt/sources.list.d
root@nginx-deployment-55fb9b765f-lb7h6:/etc/apt/sources.list.d# sed -i 's/deb.debian.org/mirrors.huaweicloud.com/g' /etc/apt/sources.list.d/debian.sources
root@nginx-deployment-55fb9b765f-lb7h6:/etc/apt/sources.list.d# apt update
root@nginx-deployment-55fb9b765f-lb7h6:~# apt -y install ethtool net-tools
root@nginx-deployment-55fb9b765f-lb7h6:~# ethtool -S eth0 
NIC statistics:
# 看这块的peer编号，然后再在node机器上找到相对应的编号
     peer_ifindex: 14  
     rx_queue_0_xdp_packets: 0
     rx_queue_0_xdp_bytes: 0
     rx_queue_0_drops: 0
     rx_queue_0_xdp_redirect: 0
     rx_queue_0_xdp_drops: 0
     rx_queue_0_xdp_tx: 0
     rx_queue_0_xdp_tx_errors: 0
     tx_queue_0_xdp_xmit: 0
     tx_queue_0_xdp_xmit_errors: 0

切换node节点

# 根据上面kubectl get pod -o wide -n myserver查找出nginx-deployment-55fb9b765f-lb7h6这个pod运行在k8s-node-54的节点上然后去k8s-node-54找网卡名称
# 在对应的node上使用ip link show 
root@k8s-node-54:~# ip link show 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 00:0c:29:22:87:0e brd ff:ff:ff:ff:ff:ff
    altname enp3s0
    altname ens160
3: kube-ipvs0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default 
    link/ether 46:36:1a:dd:5f:be brd ff:ff:ff:ff:ff:ff
4: cali073b411309a@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether ee:ee:ee:ee:ee:ee brd ff:ff:ff:ff:ff:ff link-netns cni-afaee581-c78f-3fe1-3c7e-5b6beeba720d
5: calie16db487b47@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether ee:ee:ee:ee:ee:ee brd ff:ff:ff:ff:ff:ff link-netns cni-8eab9086-4c7e-2f50-4592-3fcd86fad9b8
6: tunl0@NONE: <NOARP,UP,LOWER_UP> mtu 1480 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/ipip 0.0.0.0 brd 0.0.0.0

# 跟上面peer的编号一样也是14就是上面那个pod要找的网卡,这块calib485d2442ae就是上面那个pod在node节点上的对应网卡名称    
14: calib485d2442ae@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether ee:ee:ee:ee:ee:ee brd ff:ff:ff:ff:ff:ff link-netns cni-fb06b0a4-6ae7-20e4-1435-c5c792e0dba3
# containerd通过sudo nsenter --net=/run/netns/xxxxx  ip a 查看ip是否和上面一致
# docker通过sudo nsenter --net=/run/docker/netns/xxxxx ip a 
root@k8s-node-54:~# sudo nsenter --net=/run/netns/cni-fb06b0a4-6ae7-20e4-1435-c5c792e0dba3 ip a 
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: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/ipip 0.0.0.0 brd 0.0.0.0
3: eth0@if14: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether ce:f8:d8:a9:b4:e5 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 10.200.22.143/32 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::ccf8:d8ff:fea9:b4e5/64 scope link 
       valid_lft forever preferred_lft forever    

找到之后后续有什么问题就可以对此pod进行网络抓包进行分析对应的问题故障！！！