CODEWITHSUNDEEP
dockernetwork-programmingkubernetesgoogle-kubernetes-engine
tback
tback

Reputation: 11561

Kubernetes (gke) get name of pod network interface

I'm trying to locate a performance issue that might be network related. Therefore I want to inspect all packets entering and leaving a pod.

I'm on kubernetes 1.8.12 on GKE. I ssh to the host and I see the bridge called cbr0 that sees all the traffic. I also see a ton of interfaces named like vethdeadbeef@if3. I assume those are virtual interfaces that are created per container. Where do I look to find out which interface belongs to which container, so I can get all a list of all the interfaces of a pod.

Upvotes: 4

Views: 2386

Answers (1)

jayme
jayme

Reputation: 1316

If you have cat available in the container, you can compare the interface index of the containers eth0 with those of the veth* devices on your host. For example:

# grep ^ /sys/class/net/vet*/ifindex | grep ":$(docker exec aea243a766c1 cat /sys/class/net/eth0/iflink)"
/sys/class/net/veth1d431c85/ifindex:92

veth1d431c85 is what your are looking for.

Upvotes: 7

Related Questions