KVM部署
一、需求公司近一段DELL T460机器回来，虚拟12台来跑hadoop集群测试的，虚拟化用的KVM技术，这当中第一次使用，在部署安装过程，入了不少坑。故把整个过程写下来。
二、部署步聚
1、所需要软件
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# rpm -qa | grep -E 'qemu|libvirt|virt'
virt-what-1.11-1.2.el6.x86_64
libgovirt-0.3.2-1.el6_7.2.x86_64
libvirt-0.10.2-54.el6_7.6.x86_64
virt-viewer-2.0-7.el6.x86_64
libvirt-python-0.10.2-54.el6_7.6.x86_64
qemu-kvm-0.12.1.2-2.479.el6_7.4.x86_64
virt-manager-0.9.0-29.el6_7.1.x86_64
virt-top-1.0.4-3.15.el6.x86_64
python-virtinst-0.600.0-29.el6.noarch
gpxe-roms-qemu-0.9.7-6.14.el6.noarch
qemu-kvm-tools-0.12.1.2-2.479.el6_7.4.x86_64
libvirt-client-0.10.2-54.el6_7.6.x86_64
qemu-img-0.12.1.2-2.479.el6_7.4.x86_64
在KVM环境上，以上rpm包都是必需的。
2、安装图形化其他组件
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#yum groupinstall "Desktop" "Desktop Platform" "Desktop Platform Development" "Fonts" "General Purpose Desktop" "Graphical Administration Tools" "Grahics Creation Tools" "Input Methods" "X Window System" "Chinese Support" "Internet Browser"
#yum install libvirt-client
# yum install gpxe-roms-qemu -y
# yum install libvirt-python python-virtinst qemu-kvm
3、安装VNC
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#yum install -y tigervnc
#yum install -y tigervnc-server
在这里注意了，安装tigervnc，那么用到pc连接过去时，自然也需要要安装tigervnc电脑版
配置文件
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# cat /etc/sysconfig/vncservers
# The VNCSERVERS variable is a list of display:user pairs.
#
# Uncomment the lines below to start a VNC server on display :2
# as my 'myusername' (adjust this to your own).You will also
# need to set a VNC password; run 'man vncpasswd' to see how
# to do that.
#
# DO NOT RUN THIS SERVICE if your local area network is
# untrusted!For a secure way of using VNC, see this URL:
# https://access.redhat.com/knowledge/solutions/7027
# Use "-nolisten tcp" to prevent X connections to your VNC server via TCP.
# Use "-localhost" to prevent remote VNC clients connecting except when
# doing so through a secure tunnel.See the "-via" option in the
# `man vncviewer' manual page.
# VNCSERVERS="2:myusername"
# VNCSERVERARGS="-geometry 800x600 -nolisten tcp -localhost"
VNCSERVERS="1:root"
VNCSERVERARGS="-geometry 800x600 -depth 32"
4、创建磁盘
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qemu-img create -f qcow2 -o size=200G,preallocation="metadata" /data1/hadoop/images/kvmhadoop222.qcow2
5、使用virt-install创建虚拟机并安装GuestOS
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virt-install --virt-type kvm --name kvmhadoop222 --ram 16384 --cdrom=/root/CentOS-6.7-x86_64-LiveDVD.iso --disk path=/data1/hadoop/hadoop2/kvmhadoop202.qcow2--graphics vnc,listen=0.0.0.0 ,port=5903--noautoconsole --os-type=linux --os-variant=rhel6--network bridge=br0,model=virtio
6、用vnc连接
7、接下来就是安装操作系统了（省略）
8、虚拟机列表
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# virsh list
Id Name State
----------------------------------------------------
19 kvmhadoop223 running
21 kvmhadoop228 running
22 kvmhadoop229 running
23 kvmhadoop230 running
24 kvmhadoop231 running
25 kvmhadoop232 running
30 kvmhadoop221 running
31 kvmhadoop222 running
36 kvmhadoop233 running
37 kvmhadoop234 running
38 kvmhadoop235 running
39 kvmhadoop236 running
40 kvmhadoop224 running
9、修改端口号，到配置文件
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# pwd
/etc/libvirt/qemu
# ls
kvmhadoop202.xml.bakkvmhadoop222.xml kvmhadoop223.xmlkvmhadoop228.xmlkvmhadoop230.xmlkvmhadoop232.xmlkvmhadoop234.xmlkvmhadoop236.xml
kvmhadoop221.xml kvmhadoop222.xml.bakkvmhadoop224.xmlkvmhadoop229.xmlkvmhadoop231.xmlkvmhadoop233.xmlkvmhadoop235.xmlnetworks
10、修改端口，记得从XML配置文件定义一个domian，相当于注册一个domain但是不启动。
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#virsh define /etc/libvirt/qemu/kvmhadoop222.xml
11、然后就是启动了
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