KVM(Kernel-Based Virtual Machines)是一个基于Linux内核的虚拟化技术, 可以直接将Linux内核转换为Hypervisor（系统管理程序）从而使得Linux内核能够直接管理虚拟机, 直接调用Linux内核中的内存管理、进程管理子系统来管理虚拟机。
一 虚拟机配置
1.修改虚拟机内存，至少设置成2 GB
在“硬件”选项卡中单击“处理器”， 在虚拟化引擎中勾选如红框内所示选项，如下图：
（千万别忘了）
再添加一个磁盘大小为50的硬盘
上图为虚拟机的设置
然后启动虚拟机进行配置
2. 检查 CPU 参数
启动虚拟机，查看以下，内存是否更改成功：
[root@kvm ~]# free
total used free shared buff/cache available
Mem: 1868688 125360 1582372 8752 160956 1584208
Swap: 097148 0 2097148
检查 CPU 是否开启虚拟化支持：
[root@kvm ~]# grep -Ei 'vmx|svm' /proc/cpuinfo //vmx为英特尔的cpu；svm为AMD的cpu。 flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon nopl xtopology tsc_reliable nonstop_tsc eagerfpu pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch arat tpr_shadow vnmi ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 invpcid mpx rdseed adx smap clflushopt xsaveopt xsavec xsaves flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon nopl xtopology tsc_reliable nonstop_tsc eagerfpu pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch arat tpr_shadow vnmi ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 invpcid mpx rdseed adx smap clflushopt xsaveopt xsavec xsaves
如果显示为空，就要检查虚拟化设置，是否打 “√
3.挂载新磁盘
使用 lsblk 命令，检查虚拟机是否新增一块50的磁盘；
[root@kvm ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 20G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 19.5G 0 part ├─centos-root 253:0 0 17.5G 0 lvm / └─centos-swap 253:1 0 2G 0 lvm [SWAP] sdb 8:16 0 50G 0 disk sr0 11:0 1 4G 0 rom
sdb为新增的磁盘
然后格式化这块磁盘，格式化成ext4格式：
[root@kvm ~]# mkfs.ext4 /dev/sdb mke2fs 1.42.9 (28-Dec-2013) /dev/sdb is entire device, not just one partition! Proceed anyway? (y,n) y Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 3276800 inodes, 13107200 blocks 655360 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=2162163712 400 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424 Allocating group tables: done Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done [root@kvm ~]# blkid /dev/sdb //blkid+磁盘：查看磁盘信息 /dev/sdb: UUID="dab6d659-e334-41ed-a15a-96ce05b48c1a" TYPE="ext4"
格式化完成后，挂载磁盘，先创建挂载目录 /kvm_data ,然后进行挂载：
[root@kvm ~]# mkdir /kvm_data [root@kvm ~]# mount /dev/sdb /kvm_data/
为了方便开机可以自动挂载，编写 /etc/fstab 文件 ，添加文件最末一行：
[root@kvm ~]# vi /etc/fstab [root@kvm ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Thu Aug 22 22:51:46 2019 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/centos-root / xfs defaults 0 0 UUID=34f3cd91-b7f0-44dd-9334-2bb66e939898 /boot xfs defaults 0 0 /dev/mapper/centos-swap swap swap defaults 0 0 /dev/sdb /kvm_data ext4 defaults 0 0
4. 关闭防火墙和selinux
关闭防火墙设置开机不自启：
[root@kvm ~]# systemctl stop firewalld [root@kvm ~]# systemctl disable firewalld Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service. Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
关闭SELinux,编辑 /etc/selinux/config,将 enforcing 修改为 disabled ：
[root@kvm ~]# vi /etc/selinux/config [root@kvm ~]# cat /etc/selinux/config # This file controls the state of SELinux on the system. # SELINUX= can take one of these three values: # enforcing - SELinux security policy is enforced. # permissive - SELinux prints warnings instead of enforcing. # disabled - No SELinux policy is loaded. SELINUX=disabled //修改这一位置的内容 # SELINUXTYPE= can take one of three two values: # targeted - Targeted processes are protected, # minimum - Modification of targeted policy. Only selected processes are protected. # mls - Multi Level Security protection. SELINUXTYPE=targeted
修改完后，重启虚拟机，使其生效，使用getenforce查看：
[root@kvm ~]# getenforce Disabled
5.安装 KVM
使用Yum 安装KVM:
[root@kvm ~]# yum install -y virt-* libvirt bridge-utils qemu-img ………… Complete!
二 启动KVM
1.配置网卡
增加桥接网卡 ifcfg-br0
[root@kvm ~]# cd /etc/sysconfig/network-scripts/ [root@kvm network-scripts]# cp ifcfg-eno16777736 ifcfg-br0 //ifcfg-eno16777736为配置IP的网卡，你的网卡可能与我的不同
修改桥接网卡 ifcfg-br0的内容
[root@kvm network-scripts]# vi ifcfg-br0 [root@kvm network-scripts]# cat ifcfg-br0 TYPE=Bridge BOOTPROTO=none NAME=br0 DEVICE=br0 ONBOOT=yes IPADDR=192.168.16.5 NETMASK=255.255.255.0 GATEWAY=192.168.16.2 DNS1=114.114.114.114 DNS2=8.8.8.8
修改NATA网卡 ifcfg-eno16777736
[root@kvm network-scripts]# vi ifcfg-eno16777736 [root@kvm network-scripts]# cat ifcfg-eno16777736 TYPE=Ethernet BOOTPROTO=none NAME=eno16777736 DEVICE=eno16777736 ONBOOT=yes BRIDGE=br0
修改完网卡内容后 ，重新启动网卡服务并查看网卡信息
[root@kvm network-scripts]# service network restart
Restarting network (via systemctl): [ OK ]
[root@kvm network-scripts]# ifconfig
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.16.5 netmask 255.255.255.0 broadcast
192.168.16.255
inet6 fe80::20c:29ff:fe8d:1f90 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:8d:1f:90 txqueuelen 0 (Ethernet)
RX packets 90 bytes 7092 (6.9 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 38 bytes 3604 (3.5 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>
mtu 1500
ether 00:0c:29:8d:1f:90 txqueuelen 1000 (Ethernet)
RX packets 126287 bytes 182444678 (173.9 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 32532 bytes 2953477 (2.8 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
可以清楚的看到br0网卡出现并且带有IP，而以前的eno16777736网卡则没有IP。网卡配置完成。
2.启动 libvirtd服务
检查KVM模块是否加载
[root@kvm network-scripts]# lsmod|grep kvm kvm_intel 162153 0 kvm 525259 1 kvm_intel
启动libvirtd并检查是否成功启动
[root@kvm network-scripts]# systemctl start libvirtd [root@kvm network-scripts]# ps -ef |grep libvirt root 17270 1 1 04:36 ? 00:00:00 /usr/sbin/libvirtd nobody 17383 1 0 04:36 ? 00:00:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper root 17384 17383 0 04:36 ? 00:00:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper root 17416 2264 0 04:36 pts/0 00:00:00 grep --color=auto libvirt
启动成功后，使用brctl命令可以看到两个网卡
[root@kvm ~]# cd [root@kvm ~]# brctl show bridge name bridge id STP enabled interfaces br0 8000.000c298d1f90 no eno16777736 virbr0 8000.525400c7e229 yes virbr0-nic
3.命令安装CentOS7
CentOS7镜像下载地址：
http://mirrors.163.com/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-2003.iso
首先，通过 SCRT上传CentOS 7镜像到 /tmp 目录下，如果没有镜像的可以自行下载。上传后，使用 ll 命令查看 /tmp 目录下是否存在CentOS 7镜像文件
[root@kvm ~]# ll /tmp/ total 4228096 -rw-r--r-- 1 root root 4329570304 Apr 15 2016 CentOS-7-x86_64-DVD-1511.iso
镜像存在，使用 virt-install 进行 CentOS 7 的安装
[root@kvm ~]# virt-install --name=test --memory=512,maxmemory=1024 --vcpus=1,maxvcpus=2 --os-type=linux --os-variant=rhel7 --location=/tmp/CentOS-7-x86_64-DVD-1511.iso --disk path=/kvm_data/test.img,size=10 --bridge=br0 --graphics=none --console=pty,target_type=serial --extra-args="console=tty0 console=ttyS0"
打完上面那条命令后，等一会，就可以看见下面这段命令，这是系统基础设置，带 [!] 基本都是需要配置的，接下来我们开始配置 “Timezone settings” ，输入 “2”，按 Enter 键
Starting installer, one moment...
anaconda 21.48.22.56-1 for CentOS 7 started.
* installation log files are stored in /tmp during the installation
* shell is available on TTY2
* when reporting a bug add logs from /tmp as separate text/plain attachments
17:01:51 Not asking for VNC because we don't have a network
================================================================================
================================================================================
Installation
1) [x] Language settings 2) [!] Timezone settings
(English (United States)) (Timezone is not set.)
3) [!] Installation source 4) [!] Software selection
(Processing...) (Processing...)
5) [!] Installation Destination 6) [x] Kdump
(No disks selected) (Kdump is enabled)
7) [ ] Network configuration 8) [!] Root password
(Not connected) (Password is not set.)
9) [!] User creation
(No user will be created)
Please make your choice from above ['q' to quit | 'b' to begin installation | 'r' to refresh]: 2
=====================================================================
“Timezone settings”时区设置选择 5) Asia亚洲，再选择城市 62) Shanghai上海
Timezone settings Available regions 1) Africa 6) Atlantic 10) Pacific 2) America 7) Australia 11) US 3) Antarctica 8) Europe 12) Etc 4) Arctic 9) Indian 5) Asia Please select the timezone. Use numbers or type names directly [b to region list, q to quit]: 5 ================================================================================ ================================================================================ Timezone settings Available timezones in region Asia 1) Aden 28) Irkutsk 54) Pyongyang 2) Almaty 29) Jakarta 55) Qatar 3) Amman 30) Jayapura 56) Qyzylorda 4) Anadyr 31) Jerusalem 57) Rangoon 5) Aqtau 32) Kabul 58) Riyadh 6) Aqtobe 33) Kamchatka 59) Sakhalin 7) Ashgabat 34) Karachi 60) Samarkand 8) Baghdad 35) Kathmandu 61) Seoul 9) Bahrain 36) Khandyga 62) Shanghai 10) Baku 37) Kolkata 63) Singapore 11) Bangkok 38)Krasnoyarsk 64) Srednekolymsk 12) Beirut 39) Kuala_Lumpur 65) Taipei 13) Bishkek 40) Kuching 66) Tashkent 14) Brunei 41) Kuwait 67) Tbilisi 15) Chita 42) Macau 68) Tehran 16) Choibalsan 43) Magadan 69) Thimphu 17) Colombo 44) Makassar 70) Tokyo 18) Damascus 45) Manila 71) Ulaanbaatar 19) Dhaka 46) Muscat 72) Urumqi 20) Dili 47) Nicosia 73) Ust-Nera 21) Dubai 48) Novokuznetsk 74) Vientiane 22) Dushanbe 49) Novosibirsk 75) Vladivostok Press ENTER to continue 23) Gaza 50) Omsk 76) Yakutsk 24) Hebron 51) Oral 77) Yekaterinburg 25) Ho_Chi_Minh 52) Phnom_Penh 78) Yerevan 26) Hong_Kong 53) Pontianak 27) Hovd Please select the timezone. Use numbers or type names directly [b to region list, q to quit]: 62 ================================================================================
输入完毕后，可以发现 2 的 [!] 变成了 [x] ，证明配置完毕。
接下来配置“Software selection”，选择 “4”，在选择 “c”，因为默认就是 minimalinstall，按 Enter 键：
Installation
1) [x] Language settings 2) [x] Timezone settings
(English (United States)) (Asia/Shanghai timezone)
3) [x] Installation source 4) [!] Software selection
(Local media) (Minimal Install)
5) [!] Installation Destination 6) [x] Kdump
(No disks selected) (Kdump is enabled)
7) [ ] Network configuration 8) [!] Root password
(Not connected) (Password is not set.)
9) [!] User creation
(No user will be created)
Please make your choice from above ['q' to quit | 'b' to begin installation |
'r' to refresh]: 4
================================================================================
================================================================================
Base environment
Software selection
Base environment
1) [x] Minimal Install 7) [ ] Server with GUI
2) [ ] Compute Node 8) [ ] GNOME Desktop
3) [ ] Infrastructure Server 9) [ ] KDE Plasma Workspaces
4) [ ] File and Print Server 10) [ ] Development and Creative Work
5) [ ] Basic Web Server station
6) [ ] Virtualization Host
Please make your choice from above ['q' to quit | 'c' to continue |
'r' to refresh]: c
接下来配置 “Installation Destination”，选择 “5”，其余的依次选择 “c”，按 Enter 键：
Installation
1) [x] Language settings 2) [x] Timezone settings
(English (United States)) (Asia/Shanghai timezone)
3) [!] Installation source 4) [!] Software selection
(Processing...) (Processing...)
5) [!] Installation Destination 6) [x] Kdump
(No disks selected) (Kdump is enabled)
7) [ ] Network configuration 8) [!] Root password
(Not connected) (Password is not set.)
9) [!] User creation
(No user will be created)
Please make your choice from above ['q' to quit | 'b' to begin installation |
'r' to refresh]: 5
================================================================================
================================================================================
Probing storage...
Installation Destination
[x] 1) : 10 GiB (vda)
1 disk selected; 10 GiB capacity; 10 GiB free ...
Please make your choice from above ['q' to quit | 'c' to continue |
'r' to refresh]: c
================================================================================
================================================================================
Autopartitioning Options
[ ] 1) Replace Existing Linux system(s)
[x] 2) Use All Space
[ ] 3) Use Free Space
Installation requires partitioning of your hard drive. Select what space to use
for the install target.
Please make your choice from above ['q' to quit | 'c' to continue |
'r' to refresh]: c
================================================================================
================================================================================
Partition Scheme Options
[ ] 1) Standard Partition
[ ] 2) Btrfs
[x] 3) LVM
[ ] 4) LVM Thin Provisioning
Select a partition scheme configuration.
Please make your choice from above ['q' to quit | 'c' to continue |
'r' to refresh]: c
Generating updated storage configuration
Checking storage configuration...
================================================================================
================================================================================
接下来配置 “Root password”，选择 8，按 Enter 键:
Installation
1) [x] Language settings 2) [x] Timezone settings
(English (United States)) (Asia/Shanghai timezone)
3) [x] Installation source 4) [x] Software selection
(Local media) (Minimal Install)
5) [x] Installation Destination 6) [x] Kdump
(Automatic partitioning selecte (Kdump is enabled)
d) 8) [!] Root password
7) [ ] Network configuration (Password is not set.)
(Not connected)
9) [!] User creation
(No user will be created)
Please make your choice from above ['q' to quit | 'b' to begin installation |
'r' to refresh]: 8
================================================================================
================================================================================
依次输入两次密码，密码相同，我设置的为123456
Password: 123456 //密码为密文，不显示。 Password (confirm): 123456 ================================================================================ ================================================================================ Question You have provided a weak password: The password fails the dictionary check - it is too simplistic/systematic Would you like to use it anyway? //这句话的意思：你的密码太过简单，是否使用它，输入yes即可。 Please respond 'yes' or 'no': yes ========================================================= =========================================================
配置完成，选择 “b”，按 Enter 键后，开始安装
Installation
1) [x] Language settings 2) [x] Timezone settings
(English (United States)) (Asia/Shanghai timezone)
3) [x] Installation source 4) [x] Software selection
(Local media) (Minimal Install)
5) [x] Installation Destination 6) [x] Kdump
(Automatic partitioning selecte (Kdump is enabled)
d) 8) [x] Root password
7) [ ] Network configuration (Password is set.)
(Not connected)
9) [ ] User creation
(No user will be created)
Please make your choice from above ['q' to quit | 'b' to begin installation |
'r' to refresh]: b
================================================================================
================================================================================
Progress
Setting up the installation environment
.
Creating disklabel on /dev/vda
.
Creating xfs on /dev/vda1
.
Creating lvmpv on /dev/vda2
.
Creating swap on /dev/mapper/centos-swap
.
……………………
Installing readline (34/297)
Installing gawk (35/297)
Installing elfutils-libelf (36/297)
Installing libgpg-error (37/297)
Installing libffi (38/297)
Installing libattr (39/297)
Installing libacl (40/297)
Installing libcap (41/297)
Installing libgcrypt (42/297)
Installing cpio (43/297)
Installing libxml2 (44/297)
Installing libnl3 (45/297)
Installing expat (46/297)
Installing p11-kit (47/297)
……………………
.
Performing post-installation setup tasks
.
Configuring installed system
.
Writing network configuration
.
Creating users
.
Configuring addons
.
Generating initramfs
.
Running post-installation scripts
.
Use of this product is subject to the license agreement found at /usr/share/centos-release/EULA
Installation complete. Press return to quit
//按回车
……………………
CentOS Linux 7 (Core)
Kernel 3.10.0-327.el7.x86_64 on an x86_64
localhost login: root
Password: 123456
[root@localhost ~]#
//按“Ctrl+]”键，退出终端，回到宿主机。
[root@kvm ~]#
CentOS 7安装完成。
三 虚拟机管理
1.完成虚拟机安装，已经退回到宿主机，接下来我们来通过宿主机 virsh 命令进行管理刚才安装的 CentOS 7虚拟机。
查看虚拟机列表:
[root@kvm ~]# virsh list //查看虚拟机列表，只能看到正在运行的虚拟机 Id Name State ---------------------------------------------------- 2 test running [root@kvm ~]# virsh list --all //查看虚拟机列表，包括未运行的虚拟机 Id Name State ---------------------------------------------------- 2 test running
进入指定的虚拟:
[root@kvm ~]# virsh console test Connected to domain test Escape character is ^] //如果迟迟未动敲下回车就ok，下面就是正常登录时需要输入的用户名密码 CentOS Linux 7 (Core) Kernel 3.10.0-327.el7.x86_64 on an x86_64 localhost login:
若发生以下报错信息，命令如下：
[root@kvm ~]# virsh console test Connected to domain test Escape character is ^] error: operation failed: Active console session exists for this domain
解决方式，命令如下：
[root@kvm ~]# ps -ef |grep console root 11167 10987 0 01:55 tty1 00:00:00 virsh console test root 16017 15750 0 10:01 pts/1 00:00:00 grep --color=auto console [root@kvm ~]# kill -9 11167
vrish常用命令，命令如下：
virsh shutdown test //关闭虚拟机
virsh start test //开启虚拟机
virsh destroy test //类似stop，这个是强制停止
virsh undefine test //彻底销毁虚拟机，会删除虚拟机配置文件，virsh list --all就看不到
virsh autostart test //宿主机开机该虚拟机也开机
virsh autostart --disable test //解除开机启动
virsh suspend test //挂起
virsh resume test //恢复
2. 克隆虚拟机
克隆虚拟机之前，要先关闭虚拟机，不然会提示这种错误:
[root@kvm ~]# virt-clone --original test --name test02 --file /kvm_data/test02.img ERROR Domain with devices to clone must be paused or shutoff.
关闭虚拟机后，再次进行克隆:
[root@kvm ~]# virsh shutdown test Domain test is being shutdown [root@kvm ~]# virt-clone --original test --name test02 --file /kvm_data/test02.img Allocating 'test02.img' 3% [= ] 20 MB/s | 365 MB 00:08:23 ETA //开始克隆 [root@kvm ~]# virt-clone --original test --name test02 --file /kvm_data/test02.img Allocating 'test02.img' | 10 GB 00:00:35 Clone 'test02' created successfully. //克隆完成且成功
original：指定克隆源虚拟机。
name：指定克隆后的虚拟机名字。
file：指定目标虚拟机的虚拟磁盘文件。
查看虚拟机配置文件 /etc/libvirt/qemu/ ，看是否增加 test02.xml 文件:
[root@kvm ~]# ls /etc/libvirt/qemu/ networks test02.xml test.xml
接下来，我们启动刚刚克隆的虚拟机test02，首先查看虚拟机列表，然后启动克隆的虚拟机test02
[root@kvm ~]# virsh list --all Id Name State ---------------------------------------------------- - test shut off - test02 shut off [root@kvm ~]# virsh start test02 Domain test02 started
3. 快照管理
快照是在我们使用Vmware的时候，很常用的一个功能。它可以回到之前的某一状态。在KVM中RAW格式的虚拟磁盘不支持做快照，qcow2支持。
创建快照:
[root@kvm ~]# virsh snapshot-create test Domain snapshot 1588485687 created
查看test.img信息，同时会查看到快照列表：
[root@kvm ~]# qemu-img info /kvm_data/test.img
image: /kvm_data/test.img
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 1.1G
cluster_size: 65536
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 1588485687 0 2020-05-03 14:01:27 00:00:00.000
Format specific information:
compat: 1.1
lazy refcounts: true
列出所有快照:
[root@kvm ~]# virsh snapshot-list test Name Creation Time State ------------------------------------------------------------ 1588485687 2020-05-03 14:01:27 +0800 shutoff
查看当前快照版本:
[root@kvm ~]# virsh snapshot-current test
<domainsnapshot>
<name>1588485687</name>
<state>shutoff</state>
<creationTime>1588485687</creationTime>
<memory snapshot='no'/>
<disks>
<disk name='vda' snapshot='internal'/>
<disk name='hda' snapshot='no'/>
</disks>
<domain type='kvm'>
<name>test</name>
<uuid>49d7cb9c-20dc-42dd-a260-01532b5132e5</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>524288</currentMemory>
<vcpu placement='static' current='1'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode='custom' match='exact' check='partial'>
<model fallback='allow'>Broadwell-noTSX-IBRS</model>
<feature policy='require' name='md-clear'/>
<feature policy='require' name='spec-ctrl'/>
<feature policy='require' name='ssbd'/>
</cpu>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/kvm_data/test.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hda' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x2'/>
</controller>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<interface type='bridge'>
<mac address='52:54:00:93:bf:07'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<target type='isa-serial' port='0'>
<model name='isa-serial'/>
</target>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='unix'>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</memballoon>
<rng model='virtio'>
<backend model='random'>/dev/urandom</backend>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</rng>
</devices>
</domain>
</domainsnapshot>
查看所有快照配置文件
[root@kvm ~]# ls /var/lib/libvirt/qemu/snapshot/test/ 1588485687.xml
恢复指定快照
[root@kvm ~]# virsh snapshot-revert test 1588485687
删除指定快照
[root@kvm ~]# virsh snapshot-delete test 1588485687 Domain snapshot 1588485687 deleted
4. 磁盘格式
查看虚拟磁盘格式
[root@kvm ~]# qemu-img info /kvm_data/test.img
image: /kvm_data/test.img
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 1.1G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: true
创建 2 GB 的 RAW 格式磁盘
[root@kvm ~]# qemu-img create -f raw /kvm_data/test_1.img 2G Formatting '/kvm_data/test_1.img', fmt=raw size=2147483648
RAW格式的磁盘转换为 qcow2 格式
[root@kvm ~]# qemu-img convert -O qcow2 /kvm_data/test_1.img /kvm_data/test_1.qcow2
查看 test1.img 大小
[root@kvm ~]# ls -lh /kvm_data/test_1.img -rw-r--r-- 1 root root 2.0G May 3 15:11 /kvm_data/test_1.img [root@kvm ~]# ls -lh /kvm_data/test_1.qcow2 -rw-r--r-- 1 root root 193K May 3 15:38 /kvm_data/test_1.qcow2 //可以看到qcow2文件比较小，raw文件大小和我们指定空间大小一样是2G //raw格式的磁盘性能比qcow2要好，但是raw格式的磁盘无法做快照
将 test02 转成 raw 格式
[root@kvm ~]# qemu-img convert -O raw /kvm_data/test02.img /kvm_data/test02_2.raw
更改磁盘格式和文件路径，然后启动 test02 虚拟机
[root@kvm ~]# virsh edit test02
…………
<disk type='file' device='disk'>
<driver name='qemu' type='qcow'/>
<source file='/kvm_data/test02.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
//找到上面这部分将qcow修改为raw，/kvm_data/test02.img改为/kvm_data/test02_2.raw
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/kvm_data/test02_2.raw'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
………………
查看磁盘所属用户和组:
[root@kvm ~]# ls -l /kvm_data/ total 3310628 drwx------ 2 root root 16384 Apr 29 00:20 lost+found -rw-r--r-- 1 root root 10737418240 May 3 16:14 test02_2.raw -rw------- 1 root root 1133772800 May 3 16:02 test02.img -rw-r--r-- 1 root root 2147483648 May 3 15:11 test_1.img -rw-r--r-- 1 root root 197120 May 3 16:05 test_1.qcow2 -rw------- 1 root root 10739384832 May 3 14:14 test.img
启动虚拟机test02，然后再次查看磁盘所属用户和组
[root@kvm ~]# virsh start test02 Domain test02 started [root@kvm ~]# ls -l /kvm_data/ total 3310628 drwx------ 2 root root 16384 Apr 29 00:20 lost+found -rw-r--r-- 1 qemu qemu 10737418240 May 3 16:14 test02_2.raw -rw------- 1 root root 1133772800 May 3 16:02 test02.img -rw-r--r-- 1 root root 2147483648 May 3 15:11 test_1.img -rw-r--r-- 1 root root 197120 May 3 16:05 test_1.qcow2 -rw------- 1 root root 10739384832 May 3 14:14 test.img //启动后所属组变化成qemu的是test02_2.raw，证明这个磁盘正在被使用
5. 磁盘扩容
首先扩容RAW格式
[root@kvm ~]# qemu-img resize /kvm_data/test02_2.raw +2G Image resized.
查看test02_2.raw信息
[root@kvm ~]# qemu-img info /kvm_data/test02_2.raw image: /kvm_data/test02_2.raw file format: raw virtual size: 12G (12884901888 bytes) disk size: 1.0G
进入虚拟机test02，使用 fdisk -l 查看磁盘
[root@kvm ~]# virsh console test02 [root@localhost ~]# fdisk -l Disk /dev/vda: 10.7 GB, 10737418240 bytes, 20971520 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x0005b865 Device Boot Start End Blocks Id System /dev/vda1 * 2048 1026047 512000 83 Linux /dev/vda2 1026048 20971519 9972736 8e Linux LVM Disk /dev/mapper/centos-root: 9093 MB, 9093251072 bytes, 17760256 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/centos-swap: 1073 MB, 1073741824 bytes, 2097152 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes //可以看到磁盘还是10 GB
退出终端，关闭test02虚拟机，重新启动，然后再次进入虚拟机test02，使用 fdisk -l 查看磁盘
[root@kvm ~]# virsh destroy test02 Domain test02 destroyed [root@kvm ~]# virsh start test02 Domain test02 started [root@kvm ~]# virsh console test02 [root@localhost ~]# fdisk -l Disk /dev/vda: 12.9 GB, 12884901888 bytes, 25165824 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x0005b865 Device Boot Start End Blocks Id System /dev/vda1 * 2048 1026047 512000 83 Linux /dev/vda2 1026048 20971519 9972736 8e Linux LVM Disk /dev/mapper/centos-root: 9093 MB, 9093251072 bytes, 17760256 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/centos-swap: 1073 MB, 1073741824 bytes, 2097152 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
可以看到已经变成12 GB了。
接下来，我们怎么使用新增加的这2 GB磁盘，那就是分区
[root@localhost ~]# fdisk /dev/vda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n
//新建分区
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3):
//按Enter键
First sector (20971520-25165823, default 20971520):
//按Enter键
Using default value 20971520
Last sector, +sectors or +size{K,M,G} (20971520-25165823, default 25165823):
//按Enter键
Using default value 25165823
Partition 3 of type Linux and of size 2 GiB is set
Command (m for help): p
//查看分区列表
Disk /dev/vda: 12.9 GB, 12884901888 bytes, 25165824 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0005b865
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 1026047 512000 83 Linux
/dev/vda2 1026048 20971519 9972736 8e Linux LVM
/dev/vda3 20971520 25165823 2097152 83 Linux
Command (m for help): w
//保存退出并退出终端
除了对已有磁盘扩容外，还可以额外增加磁盘
[root@kvm ~]# qemu-img create -f raw /kvm_data/test02_3.raw 5G Formatting '/kvm_data/test02_3.raw', fmt=raw size=5368709120
使用virsh edit编辑test02虚拟机，将新磁盘增加到test02虚拟机
[root@kvm ~]# virsh edit test02
………………
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/kvm_data/test02_2.raw'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
</disk>
//找到这一部分内容，在下面增加以下内容
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/kvm_data/test02_3.raw'/>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09'
function='0x0'/>
</disk>
………………
关闭test02虚拟机，重新启动，然后进入该虚拟机，使用 fdisk -l 查看磁盘
[root@kvm ~]# virsh destroy test02 Domain test02 destroyed [root@kvm ~]# virsh start test02 Domain test02 started [root@kvm ~]# virsh console test02 [root@localhost ~]# fdisk -l Disk /dev/vda: 12.9 GB, 12884901888 bytes, 25165824 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x0005b865 Device Boot Start End Blocks Id System /dev/vda1 * 2048 1026047 512000 83 Linux /dev/vda2 1026048 20971519 9972736 8e Linux LVM /dev/vda3 20971520 25165823 2097152 83 Linux Disk /dev/vdb: 5368 MB, 5368709120 bytes, 10485760 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/centos-root: 9093 MB, 9093251072 bytes, 17760256 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/centos-swap: 1073 MB, 1073741824 bytes, 2097152 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
可以看到多了一块 5 GB 的磁盘，退出终端。
接下来，我们扩容 qcow2 格式的磁盘
[root@kvm ~]# qemu-img resize /kvm_data/test.img +2G Image resized. //若提示qemu-img: Can't resize an image which has snapshots，需要删除快照
查看 test.img 信息
[root@kvm ~]# qemu-img info /kvm_data/test.img
image: /kvm_data/test.img
file format: qcow2
virtual size: 12G (12884901888 bytes)
disk size: 1.1G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: true
关闭test虚拟机，重新启动，然后再次进入虚拟机test02，使用 fdisk -l 查看磁盘
[root@kvm ~]# virsh destroy test Domain test destroyed [root@kvm ~]# virsh start test Domain test started [root@kvm ~]# virsh console test [root@localhost ~]# fdisk -l Disk /dev/vda: 12.9 GB, 12884901888 bytes, 25165824 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x0005b865 Device Boot Start End Blocks Id System /dev/vda1 * 2048 1026047 512000 83 Linux /dev/vda2 1026048 20971519 9972736 8e Linux LVM Disk /dev/mapper/centos-root: 9093 MB, 9093251072 bytes, 17760256 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/centos-swap: 1073 MB, 1073741824 bytes, 2097152 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
分区新增加的2 GB磁盘
[root@localhost ~]# fdisk /dev/vda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3):
First sector (20971520-25165823, default 20971520):
Using default value 20971520
Last sector, +sectors or +size{K,M,G} (20971520-25165823, default 25165823):
Using default value 25165823
Partition 3 of type Linux and of size 2 GiB is set
Command (m for help): w
/保存并退出终端
新增一块qcow2格式的磁盘
[root@kvm ~]# qemu-img create -f qcow2 /kvm_data/test_2.img 5G Formatting '/kvm_data/test_2.img', fmt=qcow2 size=5368709120 encryption=off cluster_size=65536 lazy_refcounts=off
使用 virsh edit 编辑test虚拟机，将新磁盘增加到test虚拟机
[root@kvm ~]# virsh edit test
………………
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/kvm_data/test.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
//找到这一部分内容，在下面增加以下内容
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/kvm_data/test_2.img'/>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</disk>
………………
关闭test虚拟机，重新启动，然后进入该虚拟机，使用 fdisk -l 查看磁盘
[root@kvm ~]# virsh destroy test Domain test destroyed [root@kvm ~]# virsh start test Domain test started [root@kvm ~]# virsh console test [root@localhost ~]# fdisk -l Disk /dev/vda: 12.9 GB, 12884901888 bytes, 25165824 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x0005b865 Device Boot Start End Blocks Id System /dev/vda1 * 2048 1026047 512000 83 Linux /dev/vda2 1026048 20971519 9972736 8e Linux LVM /dev/vda3 20971520 25165823 2097152 83 Linux Disk /dev/vdb: 5368 MB, 5368709120 bytes, 10485760 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/centos-root: 9093 MB, 9093251072 bytes, 17760256 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/centos-swap: 1073 MB, 1073741824 bytes, 2097152 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes 退出终端
6. 调整CPU内存、网卡
查看虚拟机配置信息:
[root@kvm ~]# virsh dominfo test Id: 8 Name: test UUID: 49d7cb9c-20dc-42dd-a260-01532b5132e5 OS Type: hvm State: running CPU(s): 1 CPU time: 20.8s Max memory: 1048576 KiB Used memory: 524288 KiB Persistent: yes Autostart: disable Managed save: no Security model: none Security DOI: 0
编辑虚拟机内存:
[root@kvm ~]# virsh edit test ………… <memory unit='KiB'>1048576</memory> //最大内存 <currentMemory unit='KiB'>524288</currentMemory> //可用内存 <vcpu placement='static' current='1'>2</vcpu> //最大cpu ……………… //将以上内容修改为如下内容 ………… <memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>624288</currentMemory> <vcpu placement='static' current='1'>2</vcpu> …………
关闭虚拟机，重启动虚拟机:
[root@kvm ~]# virsh destroy test Domain test destroyed [root@kvm ~]# virsh start test Domain test started
查看虚拟机配置信息，看是否修改成功:
[root@kvm ~]# virsh dominfo test Id: 10 Name: test UUID: 49d7cb9c-20dc-42dd-a260-01532b5132e5 OS Type: hvm State: running CPU(s): 1 CPU time: 21.4s Max memory: 1048576 KiB Used memory: 624288 KiB Persistent: yes Autostart: disable Managed save: no Security model: none Security DOI: 0
除了这种修改方式之外，还有一种动态修改:
[root@kvm ~]# virsh setmem test 800m //动态修改内存 [root@kvm ~]# virsh setvcpus test 2 //动态修改cpu，只可以增加不可以减少
查看配置信息，看是否修改成功:
[root@kvm ~]# virsh dominfo test Id: 10 Name: test UUID: 49d7cb9c-20dc-42dd-a260-01532b5132e5 OS Type: hvm State: running CPU(s): 2 CPU time: 22.8s Max memory: 1048576 KiB Used memory: 819200 KiB Persistent: yes Autostart: disable Managed save: no Security model: none Security DOI: 0 [root@kvm ~]# virsh dumpxml test > /etc/libvirt/qemu/test.xml //需要把配置写入到配置文件里
查看网卡列表:
[root@kvm ~]# virsh domiflist test Interface Type Source Model MAC ------------------------------------------------------- vnet1 bridge br0 virtio 52:54:00:93:bf:07
增加一块新的网卡，并设置为NAT网络模式（virbr0类似VMware的VMnet8），这里如果写 source br0，则网络模式为桥接
[root@kvm ~]# virsh attach-interface test --type bridge --source virbr0 Interface attached successfully [root@kvm ~]# virsh domiflist test Interface Type Source Model MAC ------------------------------------------------------- vnet1 bridge br0 virtio 52:54:00:93:bf:07 vnet2 bridge virbr0 rtl8139 52:54:00:29:ed:8b [root@kvm ~]# virsh dumpxml test > /etc/libvirt/qemu/test.xml
进入test虚拟机，查看网卡信息
[root@kvm ~]# virsh console test
[root@localhost ~]# ifconfig
ens10: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.122.8 netmask 255.255.255.0 broadcast 192.168.122.255
inet6 fe80::5054:ff:fe29:ed8b prefixlen 64 scopeid 0x20<link>
ether 52:54:00:29:ed:8b txqueuelen 1000 (Ethernet)
RX packets 5186 bytes 7413267 (7.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1480 bytes 84889 (82.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens11: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.16.129 netmask 255.255.255.0 broadcast 192.168.16.255
inet6 fe80::5054:ff:fe15:abbd prefixlen 64 scopeid 0x20<link>
ether 52:54:00:15:ab:bd txqueuelen 1000 (Ethernet)
RX packets 13 bytes 1328 (1.2 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 16 bytes 1668 (1.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether 52:54:00:93:bf:07 txqueuelen 1000 (Ethernet)
RX packets 55 bytes 8520 (8.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
7. 迁移虚拟机
首先关闭虚拟机
[root@kvm ~]# virsh shutdown test Domain test is being shutdown
查看虚拟机磁盘所在目录
[root@kvm ~]# virsh domblklist test Target Source ------------------------------------------------ vda /kvm_data/test.img vdb /kvm_data/test_2.img hda - [root@kvm ~]# virsh dumpxml test > /etc/libvirt/qemu/test03.xml //如果是远程机器，需要把该配置文件拷贝到远程机器上 [root@kvm ~]# rsync -av /kvm_data/test.img /kvm_data/test03.img //-bash: rsync: command not found则yum install -y rsync //如果是迁移到远程，则需要把该磁盘文件拷贝到远程机器上 sending incremental file list test.img sent 10,742,006,844 bytes received 35 bytes 60,179,310.25 bytes/sec total size is 10,739,384,832 speedup is 1.00
因为是迁移到本机，配置文件用的是test子机的配置，不改会有冲突，所以需要修改该文件。如果是远程机器不用修改
[root@kvm ~]# vi /etc/libvirt/qemu/test03.xml
<name>test03</name>
//修改domname:
//修改uuid（随便改一下数字，位数不要变）
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/kvm_data/test03.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
//修改磁盘路径
定义新虚拟机
[root@kvm ~]# virsh define /etc/libvirt/qemu/test03.xml Domain test03 defined from /etc/libvirt/qemu/test03.xml
查看虚拟机列表，会发现新迁移的虚拟机test03
[root@kvm ~]# virsh list --all Id Name State ---------------------------------------------------- 6 test02 running - test shut off - test03 shut off