Failed to connect socket to '/var/run/libvirt/virtnetworkd-sock': No such file or directory

[陈新隆 <chenxinlong2009@xxxxxxxxx>]

Hi team, 

i'm trying to hotplug an interface to guest, after execute the command below I got an error : 

```

virsh attach-interface --domain 1 --type network --source net1 --model virtio-non-transitional --target /sys/devices/virtual/net/net1/tap603053 --mac  ac:de:48:77:a2:32 --config --live
error: Failed to attach interface
error: Failed to connect socket to '/var/run/libvirt/virtnetworkd-sock': No such file or directory

```

According to https://libvirt.org/daemons.html there's two arch of daemon which is "monolithic" and "modular" , so I was wondering if I connect to the monolithic daemon (libvirtd) to attach the interface should works. Then I execute the command below : 

```

bash-4.4# virsh -c qemu:///system?socket=/var/run/libvirt/libvirt-sock attach-interface --domain 1 --type network --source net1 --model virtio-non-transitional --target /sys/devices/virtual/net/net1/tap603053 --mac  ac:de:48:77:a2:32 --config --live
Authorization not available. Check if polkit service is running or see debug message for more information.
error: Failed to attach interface
error: Failed to connect socket to '/var/run/libvirt/virtnetworkd-sock': No such file or directory

```

Still, I got the same error.  My question is : 

1. How should I hotplug/unplug an interface without virtnetworkd ?  

2. Am I right about the guess of  "If I use monolithic daemon then I can hotplug/unplug an interface without virtnetworkd ?