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AndrewPaglusch/docker_get_physical_interfaces.sh

Last active October 8, 2021 23:53
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Find the Host "veth" Interface Each Running Docker Container is Using
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docker_get_physical_interfaces.sh
# This script will tell you what Docker container is tied to which vethXXXXXXXX interface on the host
# All other "solutions" to this problem that I found require you to exec into the container
#!/bin/bash
{ echo -e "CONTAINER_NAME\tPID\tINTERFACE"
docker ps --format '{{.Names}}' | while read cname; do
PID="$(docker inspect --format="{{.State.Pid}}" "${cname}")"
INTERFACE="$(ip link show | grep -P "^$(nsenter -t "${PID}" -n ip link show eth0 | grep -oP '(?<=@if)[^:]+')(?=:)" | grep -oP 'veth[^@]+')"
echo -e "${cname}\t${PID}\t${INTERFACE}"
done } | column -t
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