KVM basic Commands

A. Description of the problem:

The KVM host cannot connect to the client through the console and the card is not moving.

# Virsh Console Vm01

Connected to Domain vm01

Escape character is ^]

Add Virsh console support http://www.linuxidc.com/Linux/2013-02/79556.htm for KVM clients

Second, the solution: the use of VNC or host desktop into the client vm01 to add parameters

1. Add ttyS0 security license to allow root login:

# echo "TtyS0" >>/etc/securetty

2. Add parameters to the kernel in the/etc/grub.conf file:

Console=ttys0

This step should be noted:

CONSOLE=TTYS0 must be placed in kernel this line (about the 16th line), can not be a single line, that is, CONSOLE=TTYS0 is a parameter of kernel, not alone, as follows (to the right pull progress bar, at the end):

# cat-n/etc/grub.conf

# grub.conf generated by Anaconda

#

# Note that you don't have the to rerun grub after making changes to the This file

# notice:you has a/boot partition. This means

# all kernel and INITRD paths is relative to/boot/, eg.

# root (hd0,0)

# kernel/vmlinuz-version RO root=/dev/mapper/volgroup-lv_root

# initrd/initrd-[generic-]version.img

#boot =/dev/vda

Default=0

Timeout=5

Splashimage= (hd0,0)/grub/splash.xpm.gz

Hiddenmenu

Title Red Hat Enterprise Linux (2.6.32-431.el6.x86_64)

Root (hd0,0)

kernel/vmlinuz-2.6.32-431.el6.x86_64 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 rhgb quiet CONSOLE=TTYS0

Initrd/initramfs-2.6.32-431.el6.x86_64.img

3. Add Agetty in/etc/inittab:

S0:12345:respawn:/sbin/agetty ttyS0 115200

4. Restart the client:

# reboot

Third, problem solving

# Virsh Console Vm01

Connected to Domain vm01

Escape character is ^]

Red Hat Enterprise Linux Server release 6.5 (Santiago)

Kernel 2.6.32-431.el6.x86_64 on an x86_64

VM01 Login:root

Password:

Last Login:sun Oct 00:11:47 on Tty1

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KVM basic Commands