# kernel /boot/vmlinuz-version ro root=/dev/xvda1
# all kernel and initrd paths are relative to /, eg. # NOTICE: You do not have a /boot partition. # Note that you do not have to rerun grub after making changes to this file
The following is an example for a XEN system using hvc0 as the serial console. Insert the string console=hvc0 hvc0=38400,8n1 in each kernel line somewhere after the kernel directive. The init scripts see if a serial console was configured in grub, and if so then they start one up when the OS boots. Ttyu0 "/usr/libexec/getty std.9600" vt100 on secureĬentOS 6.5 and later Fedora based systems are really easy. Ttyu0 "/usr/libexec/getty std.9600" dialup off secure # The 'dialup' keyword identifies dialin lines to login, fingerd etc. Edit /etc/ttys and find the ttyu0 entry. Configure the bootloader to use the serial console by adding the line console="comconsole" to the /boot/nf file.Įcho 'console="comconsole"' > /boot/nf. Add ttyS0 to /etc/securetty to allow direct root login on the serial console. GRUB_SERIAL_COMMAND="serial -speed=9600 -unit=0 -word=8 -parity=no -stop=1" GRUB_CMDLINE_LINUX="console=tty1 console=ttyS0,9600n8" Edit /etc/default/grub and add/edit the following lines: # This service maintains a getty on ttyS0 from the point the system is Create the file /etc/init/nf with the following contents for a console on ttyS0. To exit out of a virsh console you will need to press ctrl + ] at the same time and that will break out of the console session. You should now be able to attach a console to the virtual machine by typing virsh console Then recreate it virsh start Access The KVM Through the Console Then go ahead shut down the VM virsh shutdown Then you can go ahead and save that file, by default it uses vi, so to save type :wq Once you are in the configuration you will need to change 
Replacing vm-name with the correct virtual machine name. Now you will need to login to the host machine to edit the xml file relating to that virtual machine
Save the file then remake the grub config grub2-mkconfig -o /boot/grub2/grub.cfg Enable Serial Console Access on the KVM host If you want to see the output of boot messages you can also remove “ rhgb quiet” from the console line as well. To GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet console=ttyS0" Enable VIRSH Console on the Virtual Machineįirst, log in to the virtual machine and edit /etc/default/grub and change this line from: GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet" You can read more about virsh commands on redhat’s website. Enabling serial console access can be beneficial when troubleshooting boot issues or accessing the virtual machine if networking is not working correctly at that time. To enable a serial virsh console, so you can view text-based output on the host machine from the virtual machine you will need to make modifications to both the virtual machine and the physical machine. By default Kernel-Based Virtual Machines(KVM) are not set up to access a serial console on the host using virsh.
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