Qemu/KVM虚机机日常应用案例

 1 #!/bin/bash
 2 mkdir -p /mnt/hugepages
 3 mount -t hugetlbfs hugetlbfs /mnt/hugepages
 4 sysctl vm.nr_hugepages=2048
 5 ／*以上内容为Guest机启用2M大页内容支持*／
 6 qemu-system-x86_64  7 -enable-kvm \    ／*启用kvm*／
 8 -machine accel=kvm,usb=off \    ／*Guest机加速方式选择kvm*／
 9 -cpu host \    ／*Guest机cpu特性最大程度继承Host机cpu*／
10 -smp sockets=1,cores=2,threads=1 \    ／*虚拟出1颗物理cpu，这颗物流cpu上有2个核心，每个核心支持1个线程*／
11 -m 2048 -mem-path /mnt/hugepages -mem-prealloc \    /*内存设置为2G，占用大页内存，而且是预分配，不是动态分配*/
12 -net nic,model=virtio,macaddr=66:66:66:66:66:66 -net tap,ifname=tap6,script=bridge.sh,downscript=no,vhost=on \    ／*桥接方式网卡*／
13 -boot order=dcn \    ／*Guest机启动顺序：光盘、硬盘、网络*／
14 -drive file=/home/f/Downloads/ISO_files/CentOS_6.8_x64.iso,media=cdrom \    ／*指定虚拟存储设备*／
15 -drive file=C600.img,if=virtio,cache=writeback,media=disk 16 -rtc base=localtime,clock=host \    ／*Guest机时钟与Host机保持同步*／
17 -display none \    ／*启动后不显示虚似机画面，可通过SSH连接*／
18 -monitor stdio    ／*Qemu monitor管理界面显示在当前输入输出界面*，方面监控、Hotplug及Dynamic Migration／
19 #-vnc :6 -daemonize    /*若选择VNC连接Guest机，则启用本行*，且注释掉17、18行/

 1 #!/bin/env bash
 2 del_IP() {
 3     interfaces=$(ip addr | grep -oP ‘\w+(?=:\s+<)‘ | grep -v ‘lo‘)
 4     local y
 5     for y in $interfaces
 6     do
 7         local x
 8         local ips=$(ip addr | sed -n "/$y$/p" | grep -oP ‘(\d+\.){3}\d+/\d+‘)
 9         for x in $ips
10         do
11             ip addr del $x dev $y
12         done
13     done
14 #All interfaces‘ IPs have been deleted except "lo".
15 }
16 
17 set_IP() {
18 brctl addbr br0
19 ip link set br0 up
20 brctl addif br0 eth0
21 ip addr add $ipaddr dev br0
22 if [[ $gateway == "" ]]
23 then
24     x=$(echo $ipaddr | grep -oP ‘(\d+\.){3}(?=\d+\/\d+)‘)1
25     ip route replace default via $x dev br0
26 else
27    ip route replace default via $gateway dev br0
28    #brctl stp br0 on
29 fi
30 }
31 
32 echo -n "Your desired IP ? (example： 10.1.0.10/8)： "
33 read ipaddr
34 echo -n "Your Gateway ? (example： 10.1.0.1)： "
35 read gateway
36 del_IP
37 set_IP 2>/dev/null
38 
39 ip link set $1 up
40 sleep 1
41 brctl addif br0 $1