新建一个centos8的虚拟机，使用virsh console连接失败，查阅一通资料后发现了解决方法
虚拟机中执行以下命令：
grubby --update-kernel=ALL --args="console=ttyS0" && init 6
然后，物理机中执行以下命令：
virsh list --all
virsh console 虚拟机
参考连接：https://blog.51cto.com/coolsky/3713851
其他：原文转载
新安装一台虚拟机后，是无法通过virsh console 命令连入虚拟机中的，这时我们需要开启虚拟机的console功能。
RHEL/CentOS6
一、添加ttyS0的许可，允许root登陆
[root@Inf-c6-n0 ~]# echo "ttyS0" >> /etc/securetty
二、编辑/etc/grub.conf
加入console=ttyS0
登录后复制
[root@Inf-c6-n0 ~]# cat /etc/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/mapper/c01-root
# initrd /initrd-[generic-]version.img
#boot=/dev/vda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS 6 (2.6.32-754.el6.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.32-754.el6.x86_64 ro root=/dev/mapper/c01-root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=c01/root rd_LVM_LV=c01/swap KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet console=ttyS0
initrd /initramfs-2.6.32-754.el6.x86_64.img
-----------------------------------
三、编辑/etc/inittab
在最后一行加入内容 S0:12345:respawn:/sbin/agetty ttyS0 115200
登录后复制
[root@Inf-c6-n0 ~]# cat /etc/inittab
# inittab is only used by upstart for the default runlevel.
#
# ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# System initialization is started by /etc/init/rcS.conf
#
# Individual runlevels are started by /etc/init/rc.conf
#
# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf
#
# Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf,
# with configuration in /etc/sysconfig/init.
#
# For information on how to write upstart event handlers, or how
# upstart works, see init(5), init(8), and initctl(8).
#
# Default runlevel. The runlevels used are:
# 0 - halt (Do NOT set initdefault to this)
# 1 - Single user mode
# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)
# 3 - Full multiuser mode
# 4 - unused
# 5 - X11
# 6 - reboot (Do NOT set initdefault to this)
#
id:3:initdefault:
S0:12345:respawn:/sbin/agetty ttyS0 115200
-----------------------------------
三、编辑/etc/inittab
在最后一行加入内容 S0:12345:respawn:/sbin/agetty ttyS0 115200
登录后复制
[root@Inf-c6-n0 ~]# cat /etc/inittab
# inittab is only used by upstart for the default runlevel.
#
# ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# System initialization is started by /etc/init/rcS.conf
#
# Individual runlevels are started by /etc/init/rc.conf
#
# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf
#
# Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf,
# with configuration in /etc/sysconfig/init.
#
# For information on how to write upstart event handlers, or how
# upstart works, see init(5), init(8), and initctl(8).
#
# Default runlevel. The runlevels used are:
# 0 - halt (Do NOT set initdefault to this)
# 1 - Single user mode
# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)
# 3 - Full multiuser mode
# 4 - unused
# 5 - X11
# 6 - reboot (Do NOT set initdefault to this)
#
id:3:initdefault:
S0:12345:respawn:/sbin/agetty ttyS0 115200
-----------------------------------
三、编辑/etc/inittab
在最后一行加入内容 S0:12345:respawn:/sbin/agetty ttyS0 115200
登录后复制
[root@Inf-c6-n0 ~]# cat /etc/inittab
# inittab is only used by upstart for the default runlevel.
#
# ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# System initialization is started by /etc/init/rcS.conf
#
# Individual runlevels are started by /etc/init/rc.conf
#
# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf
#
# Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf,
# with configuration in /etc/sysconfig/init.
#
# For information on how to write upstart event handlers, or how
# upstart works, see init(5), init(8), and initctl(8).
#
# Default runlevel. The runlevels used are:
# 0 - halt (Do NOT set initdefault to this)
# 1 - Single user mode
# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)
# 3 - Full multiuser mode
# 4 - unused
# 5 - X11
# 6 - reboot (Do NOT set initdefault to this)
#
id:3:initdefault:
S0:12345:respawn:/sbin/agetty ttyS0 115200
-----------------------------------
RHEL/CentOS8
在虚拟机里执行
[root@inf-r8-n0 ~]# grubby --update-kernel=ALL --args="console=ttyS0"
[root@inf-r8-n0 ~]#
[root@inf-r8-n0 ~]# reboot
1.
2.
3.
在宿主机上测试
登录后复制
[root@localhost vmfs]# virsh start Rocky8
Domain Rocky8 started
[root@localhost vmfs]# virsh console Rocky8
Connected to domain Rocky8
Escape character is ^]
[ OK ] Started Show Plymouth Boot Screen.
[ OK ] Started Forward Password Requests to Plymouth Directory Watch.
[ OK ] Reached target Paths.
[ OK ] Found device /dev/mapper/r01-root.
[ OK ] Reached target Initrd Root Device.
[ OK ] Found device /dev/mapper/r01-swap.
Starting Resume from hibernation using device /dev/mapper/r01-swap...
[ OK ] Started Resume from hibernation using device /dev/mapper/r01-swap.
[ OK ] Reached target Local File Systems (Pre).
[ OK ] Reached target Local File Systems.
Starting Create Volatile Files and Directories...
[ OK ] Started dracut initqueue hook.
Starting File System Check on /dev/mapper/r01-root...
[ OK ] Reached target Remote File Systems (Pre).
[ OK ] Reached target Remote File Systems.
-----------------------------------
https://blog.51cto.com/coolsky/3713851
View Code
标签：console,ttyS0,kvm,E6%,etc,init,virsh,conf,root From： https://www.cnblogs.com/santia-god/p/16963578.html