Fedora 20
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Virt Tools
2013/12/30
 
Install useful tools for virt management.
[1] Install virt tools.
[root@dlp ~]#
yum -y install libguestfs-tools virt-top
[2] "ls" a directory in a virtual machine
[root@dlp ~]#
virt-ls -l -d www /root 

total 40
dr-xr-x---.  3 root root 4096 Jan  1 17:44 .
dr-xr-xr-x. 18 root root 4096 Jan  1 17:40 ..
-rw-------.  1 root root   16 Jan  1 17:44 .bash_history
-rw-r--r--.  1 root root   18 Dec  4 21:14 .bash_logout
-rw-r--r--.  1 root root  176 Dec  4 21:14 .bash_profile
-rw-r--r--.  1 root root  176 Dec  4 21:14 .bashrc
-rw-r--r--.  1 root root  100 Dec  4 21:14 .cshrc
drwxr-xr-x.  3 root root 4096 Jan  1 17:44 .local
-rw-r--r--.  1 root root  129 Dec  4 21:14 .tcshrc
-rw-------.  1 root root 1029 Jan  1 17:41 anaconda-ks.cfg
[3] "cat" a file in a virtual machine
[root@dlp ~]#
virt-cat -d www /etc/passwd 

root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
...
[4] Edit a file in a virtual machine
[root@dlp ~]#
virt-edit -d www /etc/fstab 

#
# /etc/fstab
# Created by anaconda on Wed Jan  1 08:36:48 2014
#
# 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/fedora-root /                       ext4    defaults        1 1
UUID=0e579832-238d-4d2b-b96f-8fa5a89bbe78 /boot                   ext4    defaults        1 2
/dev/mapper/fedora-swap swap                    swap    defaults        0 0
[5] Display disk usage in a virtual machine
[root@dlp ~]#
virt-df -d www 

Filesystem                           1K-blocks       Used  Available  Use%
www:/dev/sda1                           487652      65353     392603   14%
www:/dev/sdora/root                   28244124     713704   26072656    3%
[6] Mount a disk for a virtual machine
[root@dlp ~]#
guestmount -d www -i /media

[root@dlp ~]#
ll /media 

total 74
lrwxrwxrwx.  1 root root     7 Jan  1 17:37 bin -> usr/bin
dr-xr-xr-x.  4 root root  1024 Jan  1 17:41 boot
drwxr-xr-x.  2 root root  4096 Jan  1 17:36 dev
drwxr-xr-x. 72 root root  4096 Jan  1 17:44 etc
drwxr-xr-x.  3 root root  4096 Jan  1 17:40 home
...
[7] Display the status of virtual machines
[root@dlp ~]#
virt-top 

virt-top 18:54:49 - x86_64 6/6CPU 2801MHz 12137MB
3 domains, 2 active, 2 running, 0 sleeping, 0 paused, 1 inactive D:0 O:0 X:0
CPU: 0.0%  Mem: 4596 MB (4596 MB by guests)

   ID S RDRQ WRRQ RXBY TXBY %CPU %MEM    TIME   NAME
   19 R    0    0    0    0  0.0  8.0   0:12.86 www
    -                                           (template)
    -                                           (win7)
 
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