docker：如何轻松获得veth桥接口对？ [英] docker: how to get veth bridge interface pair easily?

问题描述

我有两个码头码头的容器，如下所示：

i have 2 containers by docker, and bridge like this:

root@venus-166:~# docker ps
CONTAINER ID        IMAGE                                         COMMAND                CREATED             STATUS              PORTS                      NAMES
ef99087167cb        images.docker.sae.sina.com.cn/ubuntu:latest   /bin/bash -c /home/c   2 days ago          Up 21 minutes       0.0.0.0:49240->22223/tcp   night_leve3         
c8a7b18ec20d        images.docker.sae.sina.com.cn/ubuntu:latest   /bin/bash -c /home/c   2 days ago          Up 54 minutes       0.0.0.0:49239->22223/tcp   night_leve2 

bridge name bridge id       STP enabled interfaces
docker0     8000.72b675c52895   no      vethRQOy1I
                            vethjKYWka

如何获得哪个容器匹配 veth * ？

How can i get which container match veth* ?

ef99 => vethRQOy1I or ef99 => vethjKYWka

// ------------------ ----------------------------------------

//----------------------------------------------------------

我知道它的工作原理是 ethtool ，但是有没有更好的方法？

I know it works by ethtool, but is there any better way?

推荐答案

这是上面提到的ethtool技巧的一个变体，没有实际使用ethtool：

Here's a variation on the ethtool trick mentioned above, without actually using ethtool:

function veth_interface_for_container() {
  # Get the process ID for the container named ${1}:
  local pid=$(docker inspect -f '{{.State.Pid}}' "${1}")

  # Make the container's network namespace available to the ip-netns command:
  mkdir -p /var/run/netns
  ln -sf /proc/$pid/ns/net "/var/run/netns/${1}"

  # Get the interface index of the container's eth0:
  local index=$(ip netns exec "${1}" ip link show eth0 | head -n1 | sed s/:.*//)
  # Increment the index to determine the veth index, which we assume is
  # always one greater than the container's index:
  let index=index+1

  # Write the name of the veth interface to stdout:
  ip link show | grep "^${index}:" | sed "s/${index}: \(.*\):.*/\1/"

  # Clean up the netns symlink, since we don't need it anymore
  rm -f "/var/run/netns/${1}"
}

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