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====== Ubuntu - KVM - Hot attach and hot detach network interface to kvm guest ======

===== Get the name of the guest =====

Run below command on the kvm host:  

<code bash>
sudo virsh list
</code>

result:

<code bash>
 Id Name                 State
----------------------------------
  1 kvm-guest running
</code>

----

===== Check whether module acpiphp is loaded on the guest =====

<code bash>
sudo lsmod | grep -i acpiphp
</code>

----

===== If module acpiphp is NOT loaded =====

Load the aciiphp module:

<code bash>
sudo modprobe acpiphp
</code>

----

===== Hot attach the network interface =====

<code bash>
sudo virsh attach-interface kvm-guest network --model virtio --persistent
</code>

result:

<code bash>
Interface attached successfully
</code>

----

===== Verify that the interface has been attached successfully =====

Run **dmesg** on guest to verify that the interface has been attached successfully.

<code bash>
dmesg | tail
</code>

result:

<code bash>
[38613567.591261] virtio-pci 0000:00:04.0: using default PCI settings
[38613567.591283] pci 0000:00:05.0: no hotplug settings from platform
[38613567.591285] pci 0000:00:05.0: using default PCI settings
[38613567.591741] virtio-pci 0000:00:05.0: enabling device (0000 -> 0003)
[38613567.593361] ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 10
[38613567.601486] virtio-pci 0000:00:05.0: PCI INT A -> Link[LNKA] -> GSI 10 (level, high) -> IRQ 10
[38613567.601524] virtio-pci 0000:00:05.0: setting latency timer to 64
[38613567.602328] virtio-pci 0000:00:05.0: irq 43 for MSI/MSI-X
[38613567.602343] virtio-pci 0000:00:05.0: irq 44 for MSI/MSI-X
[38613567.602357] virtio-pci 0000:00:05.0: irq 45 for MSI/MSI-X
</code>

----

===== Set ipaddress for the new interface =====

<code bash>
sudo touch /etc/sysconfig/network-scripts/ifcfg-eth1; sudo echo -e "DEVICE=eth1\nONBOOT=yes\nTYPE=Ethernet\nBOOTPROTO=static\nIPADDR=10.0.0.8\nNETMASK=255.255.255.0" > /etc/sysconfig/ifcfg-eth1
</code>

----

===== Bring up the interface =====

<code bash>
sudo ifup eth1
</code>

----

===== Check the interface =====

<code bash>
ifconfig eth1
</code>

result:

<code bash>
eth1      Link encap:Ethernet  HWaddr 52:54:00:D7:10:04
          inet addr:10.0.0.8  Bcast:10.0.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:178767965 errors:0 dropped:0 overruns:0 frame:0
          TX packets:58477452 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:11949338417 (11.1 GiB)  TX bytes:498944480375 (464.6 GiB)
</code>