Install useful tools for virt management

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 centos7 /root  total 36 dr-xr-x---. 2 root root 4096 Jan 8 22:38 . drwxr-xr-x. 17 root root 4096 Jan 8 22:36 .. -rw-------. 1 root root 61 Jan 8 22:38 .bash_history -rw-r--r--. 1 root root 18 Dec 29 2013 .bash_logout -rw-r--r--. 1 root root 176 Dec 29 2013 .bash_profile -rw-r--r--. 1 root root 176 Dec 29 2013 .bashrc ...

[3]	"cat" a file in a virtual machine.

[root@dlp ~]#  virt-cat -d centos7 /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 centos7 /etc/fstab  # # /etc/fstab # Created by anaconda on Thu Jan 8 13:20:43 2015 # # 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 1 1 UUID=537b215f-30a1-4e82-b05d-f480aa8e1034 /boot xfs defaults 1 2 /dev/mapper/centos-swap swap swap defaults 0 0

[5]	Display disk usage in a virtual machine.

[root@dlp ~]#  virt-df -d centos7  Filesystem 1K-blocks Used Available Use% centos7:/dev/sda1 508588 72348 436240 15% centos7:/dev/centos/root 8910848 779252 8131596 9%

[6]	Mount a disk for a virtual machine.

[root@dlp ~]#  guestmount -d centos7 -i /media  [root@dlp ~]#  ll /media  total 32 lrwxrwxrwx. 1 root root 7 Jan 8 22:22 bin -> usr/bin dr-xr-xr-x. 4 root root 4096 Jan 8 22:37 boot drwxr-xr-x. 2 root root 6 Jan 8 22:20 dev drwxr-xr-x. 74 root root 8192 Jan 8 22:36 etc ...

[7]	Display the status of virtual machines.

[root@dlp ~]#  virt-top  virt-top 22:32:14 - x86_64 4/4CPU 2801MHz 11968MB 2 domains, 1 active, 1 running, 0 sleeping, 0 paused, 1 inactive D:0 O:0 X:0 CPU: 0.2% Mem: 500 MB (500 MB by guests) ID S RDRQ WRRQ RXBY TXBY %CPU %MEM TIME NAME 6 R 0 0 0.2 4.0 0:09.14 guestfs-o7nss1p3kxvyl1r5 - (centos7)