KVM 虚拟化技术（七） 克隆虚拟机

上一章中，我们创建了一个vm1虚拟机，虚拟机的配置文件在

[root@kvm ~]# cat /etc/libvirt/qemu/vm1.xml 

克隆虚拟机

克隆虚拟机必须先关闭虚拟机，查看虚拟机状态

[root@kvm ~]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     vm1                            shut off

开始克隆了，我们把vm1 虚拟机克隆一个叫vm2，其磁盘位置在/home/kvm/images/vm2

virt-clone -o vm1 -n vm2 -f /home/kvm/images/vm2.img

[root@kvm ~]# virt-clone -o vm1 -n vm2 -f /home/kvm/images/vm2.img
WARNING  The requested volume capacity will exceed the available pool space when the volume is fully allocated. (10240 M requested capacity > 3844 M available)
WARNING  The requested volume capacity will exceed the available pool space when the volume is fully allocated. (10240 M requested capacity > 3844 M available)
Allocating 'vm2.img'                                                                   |  10 GB     00:52     

Clone 'vm2' created successfully.

3.然后查看虚拟机列表

[root@kvm ~]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     vm1                            shut off
 -     vm2                            shut off

4.我们启动虚拟机，并且通过console 连接，

[root@kvm ~]# virsh console vm2
Connected to domain vm2
Escape character is ^]
           Welcome to CentOS 
Starting udev: G[  OK  ]
Setting hostname vm1:  [  OK  ]
Setting up Logical Volume Management:   2 logical volume(s) in volume group "vg_vm1" now active
[  OK  ]
Checking filesystems
Checking all file systems.
[/sbin/fsck.ext4 (1) -- /] fsck.ext4 -a /dev/mapper/vg_vm1-lv_root 
/dev/mapper/vg_vm1-lv_root: clean, 23060/558624 files, 267724/2230272 blocks
[/sbin/fsck.ext4 (1) -- /boot] fsck.ext4 -a /dev/sda1 
/dev/sda1: clean, 38/128016 files, 57869/512000 blocks
[  OK  ]
Remounting root filesystem in read-write mode:  [  OK  ]
Mounting local filesystems:  [  OK  ]
Enabling /etc/fstab swaps:  [  OK  ]
Entering non-interactive startup
Starting monitoring for VG vg_vm1:   2 logical volume(s) in volume group "vg_vm1" monitored
[  OK  ]
ip6tables: Applying firewall rules: [  OK  ]
iptables: Applying firewall rules: [  OK  ]
Bringing up loopback interface:  [  OK  ]
Bringing up interface eth0:  Device eth0 does not seem to be present, delaying initialization.
[FAILED]
Starting auditd: [  OK  ]
Starting system logger: [  OK  ]
Mounting filesystems:  [  OK  ]
Retrigger failed udev events[  OK  ]
Adding udev persistent rules[  OK  ]
Starting kdump:[FAILED]
Starting sshd: [  OK  ]
Starting postfix: [  OK  ]
Starting crond: [  OK  ]

CentOS release 6.8 (Final)
Kernel 2.6.32-642.el6.x86_64 on an x86_64

vm1 login: root
Password: 
Last login: Sun Mar 19 18:28:16 on ttyS0
[root@vm1 ~]# 

6.查看网卡

[root@vm1 ~]# ifconfig
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)

没有看见eth0，我们需要修改网卡配置

[root@vm1 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0 
DEVICE=eth0
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=static
IPADDR=10.1.100.140
PREFIX=24
GATEWAY=10.1.100.2
DNS1=223.5.5.5
DNS2=223.6.6.6
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"

重启网络

故障解决

1.重启网卡报错

[root@vm1 ~]# service network restart
Shutting down loopback interface:  [  OK  ]
Bringing up loopback interface:  [  OK  ]
Bringing up interface eth0:  Device eth0 does not seem to be present, delaying initialization.
[FAILED]

解决办法：

[root@vm1 ~]# rm -rf /etc/udev/rules.d/70-persistent-net.rules 

然后重启

[root@vm2 ~]# ifconfig 
eth0      Link encap:Ethernet  HWaddr 52:54:00:12:44:F6  
          inet addr:10.1.100.140  Bcast:10.1.100.255  Mask:255.255.255.0
          inet6 addr: fe80::5054:ff:fe12:44f6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1418 (1.3 KiB)  TX bytes:767 (767.0 b)

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)