1.配置桥接

1.在宿主机上，修改文件

[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# mv ifcfg-ens33 ifcfg-ens33.bak
[root@localhost network-scripts]# vi ifcfg-br0
YPE=Bridge
NAME=br0
DEVICE=br0
ONBOOT="yes"
BOOTPROTO=static
IPADDR=192.168.1.101
GATEWAY=192.168.1.1
NETMASK=255.255.255.0
DNS1=8.8.8.8
​
[root@localhost network-scripts]# vi ifcfg-ens33
DEVICE=ens33
ONBOOT=yes
BRIDGE=br0

2.重启服务

[root@localhost network-scripts]# systemctl restart network
[root@localhost network-scripts]# systemctl restart libvirtd

3.虚拟机添加网卡即可

右击虚拟机-》控制台--》添加硬件--》添加网卡

2.配置NAT网络

1.修改配置文件

[root@localhost network-scripts]# cd /etc/libvirt/qemu/networks/
[root@qfedu.com ~]# vim /etc/libvirt/qemu/networks/nat3.xml
<network>
<name>nat3</name>
<uuid>4d8b9b5c-748f-4e16-a509-848202b9c83b</uuid>
<forward mode='nat'/> //和隔离模式的区别
<bridge name='virbr4' stp='on' delay='0'/>
<mac address='52:57:00:62:0c:d4'/>
<domain name='nat3'/>
<ip address='192.168.104.1' netmask='255.255.255.0'>
 <dhcp>
 <range start='192.168.104.128' end='192.168.104.254'/>
 </dhcp>
</ip>
</network>
重启服务：
[root@qfedu.com ~]# systemctl restart libvirtd

3.配置isolated网络

1.配置文件

<network>
<name>isolate1</name>
<uuid>6341d3a6-7330-4e45-a8fe-164a6a68929a</uuid>
<bridge name='virbr2' stp='on' delay='0'/>
<mac address='52:54:00:6b:39:0c'/>
<domain name='isolate1'/>
<ip address='192.168.101.1' netmask='255.255.255.0'>
 <dhcp>
 <range start='192.168.101.128' end='192.168.101.254'/>
 </dhcp>
</ip>
</network>

2.其他网络管理命令

查看所有的⽹络：
[root@qfedu.com ~]# virsh net-list
启动⽹络：
[root@qfedu.com ~]# virsh net-start isolated200
开机⾃启动:
[root@qfedu.com ~]# virsh net-autostart isolated200 
⽹络相关基本命令
查看⼀个guest主机的⽹络接⼝信息:
[root@qfedu.com ~]# virsh domiflist vm1
接⼝ 类型 源 型号 MAC
---------------------------------------
vnet0 network default virtio 52:54:00:94:a7:a1

4.脚本

#!/bin/bash
#KVM batch create vm tool
#version: 0.1
#author: wing
#需要事先准备模板镜像和配置⽂件模板
echo "1.创建⾃定义配置单个虚拟机
2.批量创建⾃定义配置虚拟机
3.批量创建默认配置虚拟机
4.删除虚拟机"
#扩展功能：
[root@qfedu.com ~]# 查看现在虚拟机
[root@qfedu.com ~]# 查看某个虚拟机的配置
[root@qfedu.com ~]# 升配/降配
[root@qfedu.com ~]# 添加/删除⽹络
read -p "选取你的操作(1/2/3):" op
batch_self_define() {
 KVMname=`openssl rand -hex 5`
 sourceimage=/var/lib/libvirt/images/vmmodel.img
 sourcexml=/etc/libvirt/qemu/vmmodel.xml
 newimg=/var/lib/libvirt/images/${KVMname}.img
 newxml=/etc/libvirt/qemu/${KVMname}.xml
 cp $sourceimage $newimg
 cp $sourcexml $newxml
 KVMuuid=`uuidgen`
 KVMmem=${1}000000
 KVMcpu=$2
 KVMimg=$newimg
 KVMmac=`openssl rand -hex 3 | sed -r 's/..\B/&:/g'`
 sed -i
"s@KVMname@$KVMname@;s@KVMuuid@$KVMuuid@;s@KVMmem@$KVMmem@;s@KVMcpu@$KVMcpu
@;s@KVMimg@$KVMimg@;s@KVMmac@$KVMmac@" $newxml
 virsh define $newxml
 virsh list --all
}
self_define() {
 read -p "请输⼊新虚机名称:" newname
 read -p "请输⼊新虚机内存⼤⼩(G):" newmem
 read -p "请输⼊新虚机cpu个数:" newcpu
 sourceimage=/var/lib/libvirt/images/vmmodel.img
 sourcexml=/etc/libvirt/qemu/vmmodel.xml
 newimg=/var/lib/libvirt/images/${newname}.img
 newxml=/etc/libvirt/qemu/${newname}.xml
 cp $sourceimage $newimg
 cp $sourcexml $newxml
 KVMname=$newname
 KVMuuid=`uuidgen`
 KVMmem=${newmem}000000
 KVMcpu=$newcpu
 KVMimg=$newimg
 KVMmac=`openssl rand -hex 3 | sed -r 's/..\B/&:/g'`
 sed -i
"s@KVMname@$KVMname@;s@KVMuuid@$KVMuuid@;s@KVMmem@$KVMmem@;s@KVMcpu@$KVMcpu
@;s@KVMimg@$KVMimg@;s@KVMmac@$KVMmac@" $newxml
 virsh define $newxml
 virsh list --all
}
case $op in
1)self_define;;
2)
 read -p "请输⼊要创建的虚拟机的个数:" num
 read -p "请输⼊新虚机内存⼤⼩(G):" newmem
 read -p "请输⼊新虚机cpu个数:" newcpu
 for((i=1;i<=$num;i++))
 do
 batch_self_define $newmem $newcpu
 done;;
3)
 read -p "请输⼊要创建的虚拟机的个数:" num
 for((i=1;i<=$num;i++))
 do
 batch_self_define 1 1
 done;;
*)
 echo "输⼊错误，请重新执⾏脚本"
 exit;;
esac