Saturday, June 30, 2012
Virsh console - Issue and solution
I faced several issue when I tried to use "virsh console " in KVM. It simply hangs in following line:
"Escape character is ^]"
After trying several things here is how I solved the problem:
Step 1: If the VM is running destroy it (virsh destroy )
Step 2: Mount the image (following instructions are for raw disk image for Ubuntu host)
kpartx -av /location-to-disk-image
mount /dev/mapper/loop0p2 /path-to-mount
[Note: kpartx list out several mappers and you need to pick the correct one, just play around it you will find the correct one to map. Correct one is one with grub directories]
vi /path-to-mount/grub2/grub.cfg (in your case it might be grub)
add "console=ttyS0" as shown below:
kernel /vmlinuz ro a-set-of-values console=ttyS0
umount /path-to-mount
kpartx -dv /location-to-disk-image
Step 3: Now start the VM "virsh start "
Step 4: Console to the VM "virsh console "
Subscribe to:
Post Comments (Atom)
1 comment:
Thank you buddy for this article.
Just want to add that this works on LVM based VMs
And, on RHEL, afeter kpartx -av /dev/vg_name_lv_name
[root@host ~]# kpartx -av /dev/vg_vm/lv_lifeVM
add map vg_vm-lv_lifeVM1 (253:8): 0 1024000 linear /dev/vg_vm/lv_lifeVM 2048
add map vg_vm-lv_lifeVM2 (253:9): 0 61888512 linear /dev/vg_vm/lv_lifeVM 1026048
so when mount, just type
mount /dev/mapper/vg_vm-lv_lifeVM1 /mnt/
and you'll get grub.conf under /mnt/grub.
Thank you again.
Post a Comment