1 检查CPU虚拟化支持

egrep 'svm|vmx' /proc/cpuinfo

有输出说明cpu支持虚拟化，在BIOS中打开inter-VT

2 宿主机网桥设置

bridge不支持NetworkManager,所有在下面的操作前确保NetworkManager处于关闭状态

cat /etc/NetworkManager/NetworkManager.conf

[main]

plugins=ifupdown,keyfile,ofono

dns=dnsmasq

[ifupdown]

managed=false

配置managed=false

systemctl stop NetworkManager.service

配置网桥

安装bridge-utils

sudo apt-get install bridge-utils

创建网桥

brctl addbr br0

brctl addif br0 eno1

ifconfig eno1 0.0.0.0

ifconfig br0 192.168.100.20/24

添加默认网关

route add -net 0.0.0.0 netmask 0.0.0.0 gw 192.168.100.1

若要永久生效，则如下配置

cat /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)

auto lo

iface lo inet loopback

auto br0

iface br0 inet static

bridge_ports eno1

address 192.168.100.20

netmask 255.255.255.0

gateway 192.168.100.1

bridge_stp off

bridge_fd 0

dns-nameservers 8.8.8.8

重启网络后，查看网络

ifconfig

br0 Link encap:Ethernet HWaddr 1c:b7:2c:aa:3d:89

inet addr:192.168.100.20 Bcast:192.168.100.255 Mask:255.255.255.0

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:2007114 errors:0 dropped:3179 overruns:0 frame:0

TX packets:2547163 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:14447174274 (14.4 GB) TX bytes:11544824281 (11.5 GB)

eno1 Link encap:Ethernet HWaddr 1c:b7:2c:aa:3d:89

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:11663933 errors:0 dropped:8384 overruns:0 frame:0

TX packets:2472983 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:16484732144 (16.4 GB) TX bytes:237579422 (237.5 MB)

Interrupt:20 Memory:f7f00000-f7f20000

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

UP LOOPBACK RUNNING MTU:65536 Metric:1

RX packets:5895380 errors:0 dropped:0 overruns:0 frame:0

TX packets:5895380 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:9039764297 (9.0 GB) TX bytes:9039764297 (9.0 GB)

virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00

inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0

UP BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

以上说明网桥设置ok

2 安装软件包

apt install kvm qemu qemu-kvm

通过kvm-ok检测kvm是否安装好了

kvm-ok

INFO: /dev/kvm exists

KVM acceleration can be used

这样说明已经安装好了

apt install virtinst libvirt-bin python-libvirt virt-viewer virt-manager (管理工具)

apt install bridge-utils (网桥管理)

3 创建虚拟磁盘

qemu-img create -f qcow2 /vm/kvm/instance-1.img 20G

创建一个20G大小，名称为instance-001,格式为qcow2的虚拟磁盘

4 安装GuestOS

本文采用的是非交互文本方式进行安装，所以做一下操作

4.1 挂载iso镜像

sudo mount /home/wangpei/iso/CentOS-7-x86_64-DVD-1708.iso /mnt/os -o loop

4.2 搭建ftp,允许匿名登录，匿名用户家目录指向/mnt

apt instal vsftp

vsftpd配置如下：

anonymous_enable=YES

anon_root=/mnt

4.3 在/mnt下建ks.cfg文件内容如下：

bootloader --location=mbr --driveorder=vda --append="console=ttyS0 crashkernel=auto"

clearpart --all --initlabel

install

url --url=ftp://192.168.100.20/os

lang en_US.UTF-8

keyboard us

network --onboot yes --device eth0 --bootproto static --ip 192.168.100.115 --netmask 255.255.255.0 --gateway 192.168.100.1 --ipv6 auto --nameserver 8.8.8.8

rootpw --iscrypted $6$1Y6QA0TPid69iYMp$ygY0OFrw06w1oHuOC8D666fO5E9NNUMvCZuL7Uewcq8/Kz5RikrwJ9yOdouSQbTbeEIpzugqllTlSpIBVboQk0

#firewall --service=ssh

firewall --disabled

authconfig --enableshadow --passalgo=sha512

selinux --disabled

timezone --utc Asia/Shanghai

#zerombr

autopart

repo --name="CentOS" --baseurl=ftp://192.168.100.20/os --cost=100

%packages

@core

net-tools

vim

%end

reboot

5 创建虚拟机

sudo virt-install

--connect qemu:///system

--virt-type kvm

--name instance-1

--metadata description="192.168.100.115"

--ram 2048

--vcpus 2

--disk "/vm/kvm/instance-1.img"

--location ftp://192.168.100.20/os

--extra-arg="ks=ftp://192.168.100.20/ks.cfg"

--nographic

-x console=ttyS0

--force

等到出现localhost login: 说明安装好了

用virsh list --all查看虚机实例

virsh list --all

Id Name State

57 centos7 running

71 instance-1 running

78 instance-2 running

80 instance-3 running

84 instance-4 running

87 ubuntu16.04 running

97 instance-5 running

99 instance-6 running