lost and found ( for me ? ): virsh console

Showing posts with label virsh console. Show all posts

Ubuntu 13.10 KVM: build VMs without VNC by using virt-install

Here are logs when building VMs via virt-install without VNC.

# virt-install --version

0.600.4

error..

# virt-install --name ubuntu1204-varm -r 1024 --vcpus=2 --os-type=linux --os-variant=ubuntuprecise --disk path=/var/lib/KVM_images/ubuntu1204-varm.qcow2,size=10,format=qcow2 --cdrom /home/hattori/ISO_files/ubuntu-12.04.1-server-amd64.iso --accelerate --nographics --network network=default,model=virtio --hvm --extra-args='console=tty0 console=ttyS0,115200n8 serial'

ERROR --extra-args は --location とともに指定する場合のみ機能します。

when using --extra-args option, I need to use --location instead of --cdrom option.

I need to specify nfs or http or ftp path when using --location.

nfs:host:/path or nfs://host/path

An NFS server location containing an installable distribution image

http://host/path

An HTTP server location containing an installable distribution image

ftp://host/path

An FTP server location containing an installable distribution image

To specify http path, create a directory to mount ISO

# mkdir /var/www/mnt

mount the ISO

# mount -t iso9660 -o loop /home/hattori/ISO_files/ubuntu-12.04.1-server-amd64.iso /var/www/mnt

mount: block device /home/hattori/ISO_files/ubuntu-12.04.1-server-amd64.iso is write-protected, mounting read-only

# ls /var/www/mnt/

boot dists efi isolinux pics preseed ubuntu

cdromupgrade doc install md5sum.txt pool README.diskdefines

start apache2

# apache2ctl start

Now, you can specify installable image over http.

try again.

Okay, I can install ubuntu via console without VNC.

virt-install --name ubuntu1204-varm -r 1024 --vcpus=2 --os-type=linux --os-variant=ubuntuprecise --disk path=/var/lib/KVM_images/ubuntu1204-varm.qcow2,size=10,format=qcow2 --location http://127.0.0.1/mnt --accelerate --nographics --network network=default,model=virtio --hvm --extra-args='console=tty0 console=ttyS0,115200n8 serial'

Starting install...

Retrieving file version.info... | 116 B 00:00 ...

Retrieving file linux... | 9.5 MB 00:00 ...

Retrieving file initrd.gz... | 33 MB 00:00 ...

Creating domain... | 0 B 00:00

Connected to domain ubuntu1204-varm

Escape character is ^]

[ 0.000000] Initializing cgroup subsys cpuset

[ 0.000000] Initializing cgroup subsys cpu

[ 0.000000] Linux version 3.2.0-29-generic (buildd@allspice) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 (Ubuntu 3.2.0-29.46-generic 3.2.24)

[ 0.000000] Command line: method=http://127.0.0.1/mnt console=tty0 console=ttyS0,115200n8

[ 0.000000] KERNEL supported cpus:

[ 0.000000] Intel GenuineIntel

[ 0.000000] AMD AuthenticAMD

[ 0.000000] Centaur CentaurHauls

[ 0.000000] BIOS-provided physical RAM map:

[ 0.000000] BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)

[ 0.000000] BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)

[ 0.000000] BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)

[ 0.000000] BIOS-e820: 0000000000100000 - 000000003fffe000 (usable)

[ 0.000000] BIOS-e820: 000000003fffe000 - 0000000040000000 (reserved)

[ 0.000000] BIOS-e820: 00000000feffc000 - 00000000ff000000 (reserved)

[ 0.000000] BIOS-e820: 00000000fffc0000 - 0000000100000000 (reserved)

[ 0.000000] NX (Execute Disable) protection: active

[ 0.000000] DMI 2.4 present.

[ 0.000000] No AGP bridge found

KVM virsh console error: operation failed: Active console session exists for this domain

When you can not connect to VMs over “virsh conlose” as below, restart libvirt-bin.

# virsh console 8

Connected to domain centos6-vm1-appportal

Escape character is ^]

error: operation failed: Active console session exists for this domain

After restarting libvirt-bin, you will be able to access to the VM.

# /etc/init.d/libvirt-bin restart

* Restarting libvirt management daemon /usr/sbin/libvirtd [ OK ]

# virsh console 8

Connected to domain centos6-vm1

Escape character is ^]

Ubuntu13.04: install FreeBSD 9.2 64bit within KVM

Here are logs when building FreeBSD9.2 VM within KVM.

I am not familiar with FreeBSD, because I mainly use Linux.

I have built the VM by using virt-manager.

BSD 9.x are not in the OS list, so I specified BSD8.x as OS type.

KVM host

root@ubuntu-2:~# tail -1 /etc/lsb-release ;uname -ri

DISTRIB_DESCRIPTION="Ubuntu 13.04"

3.8.0-34-generic x86_64

root@ubuntu-2:~# qemu-system-x86_64 --version

root@ubuntu-2:~# libvirtd --version

libvirtd (libvirt) 1.0.2

vCPU*1

Memoery*1024

disk format: qcow2

OS type: BSD8.x

I used FreeBSD-9.2-RELEASE-amd64-dvd1.iso file to install FreeBSD.

installing BSD

booting.

get things done!

# uname -a

FreeBSD bsd01.localdomain 9.2-RELEASE FreeBSD 9.2-RELEASE #0 r255898: Thu Sep 26 22:50:31 UTC 2013 root@bake.isc.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64

execute security update

# freebsd-update fetch

# freebsd-update install

how can I enable serial console to access to the VM via “virsh console”?

add the following line in /boot/defaults/loader.conf

# tail -1 /boot/defaults/loader.conf

console="comconsole"

edit /etc/ttys

edit ttyu0 line like this:

# egrep ttyu0 /etc/ttys

#ttyu0 "/usr/libexec/getty std.9600" dialup off secure

ttyu0 "/usr/libexec/getty std.9600" vt100 on secure

reboot the OS

# reboot

connect to the VM over virsh console

virsh # console freebsd92-vm1

FreeBSD/amd64 (bsd01.localdomain) (ttyu0)

Password:

Dec 5 05:33:11 bsd01 login: ROOT LOGIN (root) ON ttyu0

virtio drivers are loading.

# dmesg | grep virtio

virtio_pci0: <VirtIO PCI Balloon adapter> port 0xc060-0xc07f irq 11 at device 4.0 on pci0

vtballoon0: <VirtIO Balloon Adapter> on virtio_pci0

virtio_pci0: host features: 0x71000002 <EventIdx,RingIndirect,NotifyOnEmpty,StatsVq>

virtio_pci0: negotiated features: 0

create one more BSD VM with virt-clone.

at first, shutdown the VM

# shutdown –p now

clone the VM

# virt-clone -o freebsd92-vm1 -n freebsd02-vm2 --file /var/lib/KVM_images/freebsd92-vm2.qcow2

割り当て中 'freebsd92-vm2.qcow2' | 20 GB 01:13

'freebsd02-vm2'のクローニングに成功しました

boot the cloned VM

# virsh list --all | grep -i bsd

- freebsd02-vm2 shut off

- freebsd92-vm1 shut off

# virsh start freebsd02-vm2 –console

change hostname

# head -1 /etc/rc.conf

hostname="bsd02.localdomain"

# reboot

how to allow non root user to become root user with su command.

add users in the wheel group

# egrep wheel /etc/group

wheel:*:0:root,hattori

Fedora 19 VM: enable serial console for virsh console

small tips.

on the Fedora 19 VM ( not a KVM host )

add consle=ttyS0,115200 in /etc/sysconfig/grub file and then update grub.cfg

# cat /etc/sysconfig/grub

GRUB_TIMEOUT=5

GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"

GRUB_DEFAULT=saved

GRUB_DISABLE_SUBMENU=true

GRUB_TERMINAL_OUTPUT="console"

GRUB_CMDLINE_LINUX="rd.lvm.lv=fedora/swap rd.md=0 rd.dm=0 vconsole.keymap=us $([ -x /usr/sbin/rhcrashkernel-param ] && /usr/sbin/rhcrashkernel-param || :) rd.luks=0 vconsole.font=latarcyrheb-sun16 rd.lvm.lv=fedora/root rhgb quiet console=ttyS0,115200"

GRUB_DISABLE_RECOVERY="true"

# grub2-mkconfig > /boot/grub2/grub.cfg

Generating grub.cfg ...

Found linux image: /boot/vmlinuz-3.11.1-200.fc19.x86_64

Found initrd image: /boot/initramfs-3.11.1-200.fc19.x86_64.img

Found linux image: /boot/vmlinuz-3.10.7-200.fc19.x86_64

Found initrd image: /boot/initramfs-3.10.7-200.fc19.x86_64.img

Found linux image: /boot/vmlinuz-3.9.5-301.fc19.x86_64

Found initrd image: /boot/initramfs-3.9.5-301.fc19.x86_64.img

Found linux image: /boot/vmlinuz-0-rescue-f3c8f32e33ea5b487a97554afaf10441

Found initrd image: /boot/initramfs-0-rescue-f3c8f32e33ea5b487a97554afaf10441.img

done

on the Feroa19 VM, add “ttyS0” in /etc/securetty file.

# echo ttyS0 >> /etc/securetty

reboot the VM. You will connect to the Fedora 19 VM over virsh console.

on the VM

# reboot

on the KVM host, connect to the VM over virsh console.

[root@localhost ~]# virsh console f19-vm1

ドメイン f19-vm1 に接続しました

エスケープ文字は ^] です

[ 0.022000] Failed to access perfctr msr (MSR c0010001 is ffffffffffffffff)

[ OK ] Started Show Plymouth Boot Screen.

[ OK ] Reached target Paths.

[ OK ] Reached target Basic System.

<snip>

Please confirm the VM has a serial port.

[root@localhost ~]# virsh dumpxml f19-vm1 | grep serial

</serial>

KVM : allow access to FreeBSD 9.0 VMs via “virsh console”

small tips

add console="comconsole" in /boot/loader.conf

# cat /boot/loader.conf

# for virtio drivers

virtio_load="YES"

virtio_pci_load="YES"

virtio_blk_load="YES"

if_vtnet_load="YES"

virtio_balloon_load="YES"

# for virsh console

console="comconsole"

edit ttys

from

ttyu0 "/usr/libexec/getty std.9600" dialup off secure

ttyu0 "/usr/libexec/getty std.9600" vt100 on secure

reboot the VM

# reboot

on the KVM host , access to the VM via “virsh console”

virsh # console bsd90-64-vm1

Connected to domain bsd90-64-vm1

Escape character is ^]

FreeBSD/amd64 (bsd90) (ttyu0)