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.
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:92veth1d431c85 is what your are looking for.