参考文章

https://www.cnblogs.com/hukey/p/11888389.html
https://kb.novaordis.com/index.php/KVM_Virtual_Networking_Concepts
https://wiki.libvirt.org/VirtualNetworking.html

ubuntu永久配置网桥

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network: 
  version: 2 
  renderer: networkd
  ethernets: 
    eth0:
      dhcp4: no
    eth1:
      dhcp4: no
  bridges:  
    virbr0: 
      addresses:
        - 10.0.0.20/24
      gateway4: 10.0.0.2
      nameservers: 
        addresses: 
          - 8.8.4.4
          - 1.1.1.1
      interfaces: 
        - eth0
		
		
#netplan apply #生效

rocky永久配置网桥

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cat /etc/sysconfig/network-scripts/ifcfg-virbr1
DEVICE=virbr1
NAME=virbr1
STP=yes
TYPE=Bridge
BOOTPROTO=static
IPADDR=10.0.0.100
PREFIX=24

cat /etc/sysconfig/network-scripts/ifcfg-virbr1-port0
TYPE=Ethernet
NAME=virbr1-port0
DEVICE=eth0
ONBOOT=yes
BRIDGE=virbr1
UUID=23f41d3b-b57c-4e26-9b17-d5f02dafd12d


kvm 桥接配置

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+--------------------------------------------------+
|                                                  |
|     +---------------------+                      |
|     |                     |                      |
|     |   Guest             |                      |
|     |                     |                      |
|     |                     |                      |
|     |   +--+eth0          |                      |
|     +---------------------+                      |
|         +--+                                     |
|          |                                       |
|          |      +----------------+               |
|          |      |                |               |
|          |   +------+            |               |
|          +-> +------+            |               |
|           vnet0 |                |               |
|                 +------------+---+               |
|                    virbr0    ^                   |
|                              |                   |
|       +----------------------+                   |
|     +----|                                       |
+--------------------------------------------------+
      |    |              Host
eth0  +--+-+
         |
         |
         | Internet
         |
         v

注意： 宿主机网桥及其出口提前配置好

然后配置kvm的网络xml 文件
vim /etc/libvirt/qemu/networks/virbr0.xml
<network>
  <name>virbr0</name>
  <uuid>6f870906-4980-4f75-89a4-ce54306e5388</uuid>
  <forward mode='bridge'/>
  <bridge name='virbr0'/>
</network>
 
激活virbr0.xml
 
virsh net-define /etc/libvirt/qemu/networks/virbr0.xml
virsh net-start virbr0
virsh net-autostart virbr0

kvm NAT配置

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vim /etc/libvirt/qemu/networks/nat.xml
<network>
    <name>nat</name>
    <forward dev='eth1' mode='nat'>
        <interface dev='eth1'/>
    </forward>
    <bridge name='vir-nat' />
    <ip address='192.168.1.1' netmask='255.255.255.0'>
        <dhcp>
            <range start='192.168.1.2' end='192.168.1.253' />
        </dhcp>
    </ip>
</network>
 
virsh net-define /etc/libvirt/qemu/networks/nat.xml
virsh net-start nat
virsh net-autostart nat
virsh net-list

kvm host only配置

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vim /etc/libvirt/qemu/networks/host-only.xml

<network>
  <name>host-only</name>
  <uuid>015e545c-dac2-40da-a857-9c09d36ed059</uuid>
  <bridge name='vir-host' stp='on' delay='0'/>
  <mac address='52:54:00:07:7c:90'/>
  <ip address='192.168.100.1' netmask='255.255.255.0'>
	<dhcp>
            <range start='192.168.100.2' end='192.168.100.253' />
    </dhcp>
  </ip>
</network>

virsh net-define /etc/libvirt/qemu/networks/host-only.xml
virsh net-start host-only
virsh net-autostart host-only

使用virt-install 创建虚拟机时指定网络

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注意：
1. network=host-only,model=virtio 中间不能有空格
2.这个/var/lib/libvirt/images/rocky8-3.qcow2 硬盘是clone 过来的硬盘已经存在系统

virt-install  --virt-type kvm --os-variant=rocky8 --name rock8-3 --ram 1024 \
--vcpus 1 --disk bus=virtio,path=/var/lib/libvirt/images/rocky8-3.qcow2  \
--network network=host-only,model=virtio --network network=virbr0,model=virtio  \
--graphics vnc,listen=0.0.0.0 --noautoconsole --autostart  --boot hd