network namespace

package main

import (
	"net"
	"runtime"
	"fmt"

	"github.com/vishvananda/netns"
	"os"
)

func main() {
	// Lock the OS Thread so we don't accidentally switch namespaces
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	file := "/var/run/docker/netns/1-107d5fc995"
	f, err := os.OpenFile(file, os.O_RDONLY, 0)
	if err != nil {
		exit("Failed to open network namespace path %q: %v \n", file, err)
	}
	defer f.Close()

	if err = netns.Set(netns.NsHandle(f.Fd())); err != nil {
		exit("Setting setns %s failed: %v \n", file, err)
	}

	ifaces, _ := net.Interfaces()
	fmt.Printf("Interfaces: %v\n", ifaces)
}

func exit(format string, a ...interface{}) {
	fmt.Printf(format, a...)
	fmt.Println()
	os.Exit(1)
}