smart-os/04_run_qemu.sh

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#!/bin/sh
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#---------------------
# 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
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# 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
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# stop nat
stop_nat
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#----------------------------------------------------
#
# 多硬盘测试 -hdb extra.img
#
#----------------------------------------------------
# make_sdb.sh
# qemu-system-x86_64 -drive format=raw,file=disk.img -hdb extra.img