LIBVIRT XML SERIAL CONSOLE MANUAL

To detect the presence of a serial console, the kernal command line has to contain console=ttyS0, wheares a virtio console is detected by the presence of /dev/hvc0. Most modern linux distributions automaticallt start a getty process when they detect the presence of a serial console. Using virtio, you get /dev/hvc0 as the console device. Using the serial type for the console, you get the usual /dev/ttyS0 console. The important setting is the type attribute of the target tag. When looking at the output of virsh dumpxml vm-name. Make sure the console configuration of the VM is set to serial, not virtio for if you want to be able to use the console for grub and in single user mode. Your VM has to have a serial console configured.

LIBVIRT XML SERIAL CONSOLE MANUAL

Manual activation of the serial consoleįor reference, the command to activate the serial console manually is systemctl enable start configuration (libvirt based) It should NOT be necessary to activate the serial console manually. Systemd based distributions start a getty process for the serial console automatically when they detect the serial console option on the kernel command line. This will automatically activate the getty program on the serrial console to provide the login prompt on the serial console. To activate the serial kernel console, for booting and shutdown messages, the kernel comand line should end in.

To get grub to use the serial console for displying the menu, the config file should contain, before the hidemenu line: splashimage=(hd0,0)/grub/ RHEL 6 based distributions, like Scientific Linux 6 or CentOS 6 use the older legacy (v1) grub, where the user edits /boot/grub/grub.cfgdirectly. Refresh grub using grub2-mkconfig -o /boot/grub2/grub.cfg # CentOS, RHEL GRUB_CMDLINE_LINUX_DEFAULT='console=ttyS0,115200n8 console=tty1' Serial console for KVM based VM and IPMI serial channel grub and kernel console

Libvirt xml serial console