xen学习（一）

添加镜像源

[root@xen xen]# cat /etc/yum.repos.d/xen.repo
[xen]
name=xenserver
baseurl=http://mirrors.163.com/centos/6.7/xen4/x86_64/
gpgcheck=0

安装

yum -y install xen

修改引导文件

title CentOS (3.18.21-16.el6.x86_64)
    root (hd0,0)
        kernel /xen.gz dom0_men=1024M cpufreq=xen dom0_max_vcpus=2 d0m0_vcpus_pin
    module /vmlinuz-3.18.21-16.el6.x86_64 ro root=/dev/mapper/vg_xen-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg_xen/lv_swap rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=vg_xen/lv_root  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
    module /initramfs-3.18.21-16.el6.x86_64.img

1.重启后查看内核

[root@xen xen]# uname -r
3.18.21-16.el6.x86_64

设置桥接模式

1.eth0设置

[root@xen network-scripts]# cat ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
UUID=ff8ebf1a-a744-458c-b0db-9f8d4b0542a2
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=static
BRIDGE=xenbr0

2.xenbr0设置

[root@xen network-scripts]# cat ifcfg-xenbr0
DEVICE=xenbr0
TYPE=Bridge
NM_CONTROLLED=no
BOOTPROTO=static
IPADDR=10.1.100.19
PREFIX=24
GATEWAY=10.1.100.2
DNS1=114.114.114.114

3.重启网络并查看

#/etc/init.d/network restart
[root@xen network-scripts]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:C0:35:B0
          inet6 addr: fe80::20c:29ff:fec0:35b0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3579 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1549 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:438611 (428.3 KiB)  TX bytes:190668 (186.1 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  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:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

xenbr0    Link encap:Ethernet  HWaddr 00:0C:29:C0:35:B0
          inet addr:10.1.100.19  Bcast:10.1.100.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fec0:35b0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1864 errors:0 dropped:0 overruns:0 frame:0
          TX packets:637 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:269867 (263.5 KiB)  TX bytes:73018 (71.3 KiB)

创建虚拟机

1.创建磁盘

[root@xen /]# qemu-img create -f raw -o size=2G /images/xen/busybox.img

1. 查看磁盘大小

   [root@xen xen]# ll -h total 0 -rw-r--r--. 1 root root 2.0G Dec 14 22:30 busybox.img [root@xen xen]# du -sh busybox.img 0 busybox.img

3.格式化

[root@xen xen]# mke2fs -t ext4 busybox.img

4.挂载

[root@xen xen]# mount -o loop /images/xen/busybox.img /mnt/

创建一个最小化的虚拟机

1.下载busybox

wget -c https://busybox.net/downloads/busybox-1.22.1.tar.bz2
[root@xen ~]# tar xf busybox-1.21.1.tar.bz2
[root@xen ~]# cd busybox-1.21.1

2.安装编译环境

# yum -y groupinstall "Development Tools" "Server Platform Development"

3.安装glibc-static 将busybox编译成静态文件

# yum -y install glibc-static

1. 编译

   # make menuconfig
   

   1)选择busybox settings

2）选择build options

3）勾选第一项，保存退出

然后执行编译

    # make -j
    #make install

5.复制install到mnt目录，并创建linux必须的一些目录

[root@xen busybox-1.21.1]# cp -a _install/* /mnt/
[root@xen busybox-1.21.1]# cd /mnt/
[root@xen mnt]# mkdir proc sys dev etc var boot home
[root@xen mnt]# ll
total 56
drwxr-xr-x. 2 root root  4096 Dec 14 23:20 bin
drwxr-xr-x. 2 root root  4096 Dec 14 23:22 boot
drwxr-xr-x. 2 root root  4096 Dec 14 23:22 dev
drwxr-xr-x. 2 root root  4096 Dec 14 23:22 etc
drwxr-xr-x. 2 root root  4096 Dec 14 23:22 home
lrwxrwxrwx. 1 root root    11 Dec 14 23:20 linuxrc -> bin/busybox
drwx------. 2 root root 16384 Dec 14 22:30 lost+found
drwxr-xr-x. 2 root root  4096 Dec 14 23:22 proc
drwxr-xr-x. 2 root root  4096 Dec 14 23:20 sbin
drwxr-xr-x. 2 root root  4096 Dec 14 23:22 sys
drwxr-xr-x. 4 root root  4096 Dec 14 23:20 usr
drwxr-xr-x. 2 root root  4096 Dec 14 23:22 var

测试是否可以访问

1.测试是否可以访问目标系统

[root@xen /]# chroot /mnt/ /bin/sh
/ # ls
bin         dev         home        lost+found  sbin        usr
boot        etc         linuxrc     proc        sys         var
/ #

2.创建内核链接到目标系统

[root@xen boot]# ln -s vmlinuz-2.6.32-573.el6.x86_64 vmlinuz
[root@xen boot]# ln -sv initramfs-2.6.32-573.el6.x86_64.img initramfs.img
`initramfs.img' -> `initramfs-2.6.32-573.el6.x86_64.img'

3.设置xen启动配置文件

[root@xen xen]# cp xlexample.pvlinux busybox
[root@xen xen]# vim busybox

1）配置文件

# =====================================================================
# Example PV Linux guest configuration
# =====================================================================
#
# This is a fairly minimal example of what is required for a
# Paravirtualised Linux guest. For a more complete guide see xl.cfg(5)

# Guest name
name = "busybox-001"

# 128-bit UUID for the domain as a hexadecimal number.
# Use "uuidgen" to generate one if required.
# The default behavior is to generate a new UUID each time the guest is started.
#uuid = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"

# Kernel image to boot
kernel = "/boot/vmlinuz"

# Ramdisk (optional)
ramdisk = "/boot/initramfs.img"

# Kernel command line options
extra = "selinux=0 init=/bin/sh"

# Initial memory allocation (MB)
memory = 512

# Maximum memory (MB)
# If this is greater than `memory' then the slack will start ballooned
# (this assumes guest kernel support for ballooning)
#maxmem = 512

# Number of VCPUS
vcpus = 2

# Network devices
# A list of 'vifspec' entries as described in
# docs/misc/xl-network-configuration.markdown
#vif = [ '' ]

# Disk Devices
# A list of `diskspec' entries as described in
# docs/misc/xl-disk-configuration.txt
disk = [ '/images/xen/busybox.img,raw,xvda,rw' ]
root = "/dev/xvda ro"
~

3.启动虚拟机直接进入console

[root@xen xen]# xl create busybox -c
*******
/ # ls
bin         dev         home        lost+found  sbin        usr
boot        etc         linuxrc     proc        sys         var
/ # ifconfig -a
lo        Link encap:Local Loopback
          LOOPBACK  MTU:65536  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:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
/ #

4.退出

   exit  拆除虚拟机
   ctrl + ]  退出控制台

5.查看虚拟机

# [root@xen xen]# xl list
Name                                        ID   Mem VCPUs  State   Time(s)
Domain-0                                     0  4234     2     r-----     787.3
busybox-001                                  2   512     2     -b----       2.2

6.进取虚拟机

[root@xen xen]# xl console busybox-001

7.关闭虚拟机

/bin # [root@xen xen]# xl destroy busybox-001
DEBUG libxl__device_destroy_tapdisk 105 type=aio:/images/xen/busybox.img disk=:/images/xen/busybox.img
[root@xen xen]# xl list
Name                                        ID   Mem VCPUs  State   Time(s)
Domain-0                                     0  4234     2     r-----     793.9

8.添加网卡

常用的key mac = 00:16：3e开头，默认会自己指定 bridge = 指定此网络接口在dom0中被关联在哪个桥设备中 model=模拟成哪一种设备，例如e1000 virname=接口名称，在dom0中显示 script=创建接口时需要执行的脚本 ip地址

1）编辑配置文件

vif = [ 'bridge=xenbr0,mac=00:16:3e:56' ]

2.）查看网卡驱动

[root@xen xen]# cd /lib/modules/2.6.32-573.el6.x86_64/kernel/drivers/net/
[root@xen net]# cp xen-netfront.ko 8139too.ko mii.ko /mnt/lib/modules/

3）启动虚拟机加载模块

    / # insmod /lib/modules/xen-netfront.ko
    Initialising Xen virtual ethernet driver.
    / # ifconfig -a
    eth0      Link encap:Ethernet  HWaddr 00:16:3E:56:DA:00
              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)
              Interrupt:18 

    lo        Link encap:Local Loopback
              LOOPBACK  MTU:65536  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:0
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)