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

[陈新隆]

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 ?
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