编写Shell程序，基于KVM虚拟化技术网桥部署，本地网卡加入，并测试外网通信

以下是一个简单的Shell程序，用于在KVM虚拟化技术中配置网桥并测试外网通信。

#!/bin/bash

# 安装必要的软件包
apt-get update
apt-get install -y qemu-kvm libvirt-bin bridge-utils

# 停止并禁用Network Manager服务
systemctl stop NetworkManager.service
systemctl disable NetworkManager.service

# 创建网桥
cat <<EOT > /etc/network/interfaces.d/br0.cfg
auto br0
iface br0 inet dhcp
bridge_ports eth0
EOT

# 重启网络服务
systemctl restart networking.service

# 创建虚拟机
virt-install \
--name test \
--ram 2048 \
--vcpus 2 \
--disk path=/var/lib/libvirt/images/test.img,size=10 \
--os-type linux \
--os-variant ubuntu18.04 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial

# 启动虚拟机
virsh start test

# 测试外网通信
ping -c 4 www.google.com

# 关闭虚拟机
virsh shutdown test

# 删除虚拟机
virsh undefine test

# 删除网桥
sed -i '/iface br0/d' /etc/network/interfaces.d/br0.cfg
systemctl restart networking.service

# 启用Network Manager服务
systemctl enable NetworkManager.service
systemctl start NetworkManager.service

echo "Done!"