Centos7 Kvm vm 磁盤文件讀取

1、多種方式讀取磁盤文件

#掛載讀取，
#libguestfs-tools工具直接讀取磁盤文件

2、libguestfs-tools工具

#libguestfs-tools-c命令工具
[root@node71 ~]# rpm -ql libguestfs-tools-c | grep /usr/bin
/usr/bin/guestfish
/usr/bin/guestmount
/usr/bin/guestunmount
/usr/bin/virt-alignment-scan
/usr/bin/virt-builder
/usr/bin/virt-cat
/usr/bin/virt-copy-in
/usr/bin/virt-copy-out
/usr/bin/virt-customize
/usr/bin/virt-df
/usr/bin/virt-diff
/usr/bin/virt-edit
/usr/bin/virt-filesystems
/usr/bin/virt-format
/usr/bin/virt-index-validate
/usr/bin/virt-inspector
/usr/bin/virt-log
/usr/bin/virt-ls
/usr/bin/virt-make-fs
/usr/bin/virt-rescue
/usr/bin/virt-resize
/usr/bin/virt-sparsify
/usr/bin/virt-sysprep
/usr/bin/virt-tar-in
/usr/bin/virt-tar-out
[root@node71 ~]# 
#命令測試
[root@node71 ~]# vir
virsh                    virt-edit                virt-make-fs             virt-tar-out
virt-alignment-scan      virt-filesystems         virt-manager             virt-v2v
virt-builder             virt-format              virt-p2v-make-disk       virt-viewer
virt-cat                 virt-host-validate       virt-p2v-make-kickstart  virt-what
virt-clone               virt-index-validate      virt-pki-validate        virt-win-reg
virt-copy-in             virt-inspector           virt-rescue              virt-xml
virt-copy-out            virt-install             virt-resize              virt-xml-validate
virt-customize           virtlockd                virt-sparsify            
virt-df                  virt-log                 virt-sysprep             
virt-diff                virt-ls                  virt-tar-in              
[root@node71 ~]# vir

3、virt-cat 查看vm中的文件信息

#vm可以是開機狀態
[root@node71 ~]# virt-cat -d oel1 /etc/fstab

#
# /etc/fstab
# Created by anaconda on Mon Oct 10 23:08:01 2016
#
# 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/VolGroup-lv_root /                       ext4    defaults        1 1
UUID=80333690-f7de-44e3-aa17-a58c6a4c9e03 /boot                   ext4    defaults        1 2
/dev/mapper/VolGroup-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
[root@node71 ~]# virsh list 
 Id    名稱                         狀態
----------------------------------------------------
 18    oel1                           running

[root@node71 ~]# virt-cat -a /home/data/vm/oel1/oel1_qcow2.img /etc/fstab

#
# /etc/fstab
# Created by anaconda on Mon Oct 10 23:08:01 2016
#
# 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/VolGroup-lv_root /                       ext4    defaults        1 1
UUID=80333690-f7de-44e3-aa17-a58c6a4c9e03 /boot                   ext4    defaults        1 2
/dev/mapper/VolGroup-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
[root@node71 ~]# virsh console oel1
連接到域 oel1
換碼符為 ^]


Oracle Linux Server release 6.6
Kernel 3.8.13-44.1.1.el6uek.x86_64 on an x86_64

localhost.localdomain login: root
Password: 
Last login: Fri Oct 14 05:12:26 on ttyS0
[root@localhost ~]# cat /etc/fstab 

#
# /etc/fstab
# Created by anaconda on Mon Oct 10 23:08:01 2016
#
# 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/VolGroup-lv_root /                       ext4    defaults        1 1
UUID=80333690-f7de-44e3-aa17-a58c6a4c9e03 /boot                   ext4    defaults        1 2
/dev/mapper/VolGroup-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
[root@localhost ~]# 

4、virt-df 查看磁盤使用情況

# 顯示磁盤分區使用情況
[root@node71 ~]# virt-df oel1 
Filesystem                           1K-blocks       Used  Available  Use%
oel1:/dev/sda1                          487652      56871     401085   12%
oel1:/dev/VolGroup/lv_root            19003260    1581740   16433156    9%
[root@node71 ~]# virsh console oel1
連接到域 oel1
換碼符為 ^]


[root@localhost ~]# df
Filesystem           1K-blocks    Used Available Use% Mounted on
/dev/mapper/VolGroup-lv_root
                      19003260 1581740  16433156   9% /
tmpfs                   251068       0    251068   0% /dev/shm
/dev/vda1               487652   56871    401085  13% /boot
[root@localhost ~]# 

5、virt-log

#顯示虛擬機的日志，vm可以是開機
[root@node71 ~]# virt-log -a /home/data/vm/oel1/oel1_qcow2.img
Oct 24 03:30:01 localhost rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="963" x-info="http://www.rsyslog.com"] rsyslogd was HUPed
Oct 24 04:29:44 localhost init: serial (ttyS0) main process (1142) killed by TERM signal
Oct 24 04:29:44 localhost init: tty (/dev/tty2) main process (1146) killed by TERM signal
Oct 24 04:29:44 localhost init: tty (/dev/tty3) main process (1148) killed by TERM signal
Oct 24 04:29:44 localhost init: tty (/dev/tty4) main process (1150) killed by TERM signal
Oct 24 04:29:44 localhost init: tty (/dev/tty5) main process (1152) killed by TERM signal
Oct 24 04:29:44 localhost init: tty (/dev/tty6) main process (1154) killed by TERM signal
Oct 24 04:29:45 localhost acpid: exiting
Oct 24 04:29:45 localhost auditd[941]: The audit daemon is exiting.
Oct 24 04:29:45 localhost kernel: type=1305 audit(1477297785.679:49): audit_pid=0 old=941 auid=4294967295 ses=4294967295 subj=system_u:system_r:auditd_t:s0 res=1
Oct 24 04:29:45 localhost kernel: type=1305 audit(1477297785.808:50): audit_enabled=0 old=1 auid=4294967295 ses=4294967295 subj=system_u:system_r:auditctl_t:s0 res=1
Oct 24 04:29:45 localhost kernel: Kernel logging (proc) stopped.
Oct 24 04:29:45 localhost rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="963" x-info="http://www.rsyslog.com"] exiting on signal 15.
Oct 25 02:57:31 localhost kernel: imklog 5.8.10, log source = /proc/kmsg started.
Oct 25 02:57:31 localhost rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="963" x-info="http://www.rsyslog.com"] start
Oct 25 02:57:31 localhost kernel: Initializing cgroup subsys cpuset
Oct 25 02:57:31 localhost kernel: Initializing cgroup subsys cpu
Oct 25 02:57:31 localhost kernel: Linux version 3.8.13-44.1.1.el6uek.x86_64 (mockbuild@ca-build44.us.oracle.com) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC) ) #2 SMP Wed Sep 10 06:10:25 PDT 2014
Oct 25 02:57:31 localhost kernel: Command line: ro root=/dev/mapper/VolGroup-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD rd_LVM_LV=VolGroup/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=VolGroup/lv_root  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM console=ttyS0 rhgb quiet
……
……
……
Oct 25 02:57:31 localhost kernel: NET: Registered protocol family 10
Oct 25 02:57:31 localhost kernel: type=1305 audit(1477378651.397:4): audit_pid=943 old=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:auditd_t:s0 res=1
Oct 25 02:57:31 localhost kdump: No crashkernel parameter specified for running kernel
Oct 25 02:57:31 localhost acpid: starting up with proc fs
Oct 25 02:57:31 localhost acpid: skipping incomplete file /etc/acpi/events/video.conf
Oct 25 02:57:31 localhost acpid: 1 rule loaded
Oct 25 02:57:31 localhost acpid: waiting for events: event logging is off