From caeb5f880cdd43a0ab661631249c785420c8c58e Mon Sep 17 00:00:00 2001
From: superconvert <48017165+superconvert@users.noreply.github.com>
Date: Mon, 25 Jul 2022 06:14:28 +0800
Subject: [PATCH] Update 04_run_qemu.sh

---
 04_run_qemu.sh | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/04_run_qemu.sh b/04_run_qemu.sh
index 6c90d5f..4b62f84 100644
--- a/04_run_qemu.sh
+++ b/04_run_qemu.sh
@@ -1,7 +1,85 @@
 #!/bin/sh
+
+#---------------------
+# 停掉 NAT 
+#---------------------
+stop_nat() {
+  # 停掉 tap0
+  ip link set tap0 down 
+  # 断开与网桥链接
+  brctl delif br0 tap0
+  # 停掉网桥
+  ip link set br0 down
+  # 删除设备 tap0
+  ip tuntap del mode tap tap0
+  # 删除网桥
+  brctl delbr br0
+}
+
+#---------------------
+# 启动 NAT
+#---------------------
+start_nat() {
+  # 创建虚拟网桥
+  brctl addbr br0
+  # 创建虚拟tap设备
+  ip tuntap add dev tap0 mode tap
+  # 将tap设备介入网桥
+  brctl addif br0 tap0
+  # 配置网桥ip
+  ip addr add 192.168.100.1/24 dev br0
+  ip addr add 192.168.100.2/24 dev tap0 
+  # 启动桥设备和虚拟网卡设备
+  ip link set br0 up 
+  ip link set tap0 up
+  # 配置iptables forward转发规则
+  # 在基本环境搭建这一节中，设置了一个本地网络，虚机只能访问host，无法访问外网，如果需要访问外网需要设置SNAT
+  iptables -t nat -A POSTROUTING -s 192.168.100.0/24 ! -d 192.168.100.0/24 -j MASQUERADE
+  # 开启物理网卡的转发功能:
+  sysctl -w net.ipv4.ip_forward=1
+  # 如果有防火墙的，特别是centos系统中，记得放开防火墙
+  iptables -A FORWARD -s 192.168.100.0/24 -j ACCEPT
+}
+
+#----------------------
+# DNS 服务
+#----------------------
+start_dns() {
+
+# 准备dnsmasq配置文件,启动dnsmasq服务，这样就能为虚拟机自动分配IP了
+cat<<EOF>dnsmasq.conf
+strict-order
+pid-file=/var/run/dnsmasq.pid
+except-interface=lo
+bind-interfaces
+listen-address=192.168.0.1
+dhcp-range=192.168.100.2,192.168.100.254
+dhcp-no-override
+dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases
+dhcp-lease-max=253
+dhcp-hostsfile=/var/lib/libvirt/dnsmasq/default.hostsfile
+addn-hosts=/var/lib/libvirt/dnsmasq/default.addnhosts
+EOF
+/usr/sbin/dnsmasq --conf-file=./dnsmasq.conf
+
+}
+
+stop_dns() {
+  # 杀掉 dhcp 服务
+  killall dnsmasq
+}
+
+#----------------------------------------------
+# 运行 smart-os 前，先启动这个，这样就能上网了
+#----------------------------------------------
+start_nat
+
 # 启动镜像 网络对应 run_nat.sh 里面的配置
 qemu-system-x86_64 -drive format=raw,file=disk.img -netdev tap,id=nd0,ifname=tap0 -device e1000,netdev=nd0 
 
+# stop nat
+stop_nat
+
 #----------------------------------------------------
 #
 # 多硬盘测试 -hdb extra.img