Hello,

I attach to this thread to detail how I was able to have serial console working both on CentOS 6.7 and CentOS 7.2 VMs on 3.6.5

- CentOS 6.7

Basically what described in general here (but using ttyS0 instead ttyS1):

So in /boot/grub/grub.conf

a) right before the "hiddenmenu" line:

serial --unit=0 --speed=19200 --word=8 --parity=no --stop=1

terminal --timeout=5 serial console

b) At the end of kernel line added:

console=tty0 console=ttyS0,19200n8

Added at the end of /etc/securetty the line

ttyS0

Only difference is that as I used ttyS0, the upstart configuration was not needed: the system after reboot was already listening on ttyS0

Creating upstart config file generated 2 processes listening on ttyS0

- CentOS 7.2

created VM with virtio console enabled in options and basically following what described here

from default configuration I got after install:

Add in /etc/default/grub "console=ttyS0" in GRUB_CMDLINE_LINUX so that it is now:

GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet console=ttyS0"

grub2-mkconfig -o /boot/grub2/grub.cfg

reboot the VM

From a client:

Available Serial Consoles:

00 c6desktop[68a82ada-a1d2-44d0-85b0-f3a08cc2f579]

01 c7desktop[787f46f6-de4a-4b42-ba39-9609908c2905]

SELECT> 01

CentOS Linux 7 (Core)

Kernel 3.10.0-327.13.1.el7.x86_64 on an x86_64

Host-006 login: root

Password:

Last login: Tue May 3 01:34:57 on pts/0

[root@Host-006 ~]#

[root@Host-006 ~]# cat /etc/redhat-release

CentOS Linux release 7.2.1511 (Core)

[root@Host-006 ~]# exit

HIH,

Gianluca