Monitoring host network does not work while the networking of container is not host

[amiraliucsc]

Feature Request

Opening a feature request kicks off a discussion.

Proposal:

I am running Telegraf 1.7 as a docker container. I have a network defined which both telegraf and influx are using it. When I mount /proc/net/dev inside the container in /rootfs/proc/net/dev, that files only contains loopback and one more interface. But I need to pass all the information of the host. If I do cat /proc/net/dev in the host, I see all the interfaceses wherease if I cat /rootfs/proc/net/dev I see only one interface beside loopbak.

Current behavior:

Desired behavior:

I would like to see all the interfaces in the docker container.

Use case: [Why is this important (helps with prioritizing requests)]

To run Telegraf as docker and be able to collect network metrics of the host

[glinton]

This is a network namespace limitation, you will need to use --net=host on your telegraf container in order to monitor host interfaces. see here for similar question