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Create Virtual Machine #1
2011/03/15 |
| Install GuestOS and create Virtual Machine. This example shows to install Scientific Linux 6.
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| [1] | Install on text mode via network, it's OK on Console or remote connection with Putty and so on. Furthermore, Virtual Machine's images are placed at /var/lib/libvirt/images by default as a Storage Pool, but this example shows to create and use a new Storage Pool. |
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[root@dlp ~]# mkdir -p /var/kvm/images # create a new Storage Pool [root@dlp ~]# virt-install \ -n www \ -r 1024 \ -f /var/kvm/images/www.img \ -s 20 \ --vcpus=2 \ --os-type linux \ --os-variant=rhel6 \ --network bridge=br0 \ --nographics \ --location='http://ftp.jaist.ac.jp/pub/Linux/scientific/6/x86_64/os/' \ --extra-args='console=tty0 console=ttyS0,115200n8 serial' Starting install... # start installation |
| For options, read 'man virt-install', there are many options. -n specify the name of Virtual Machine -r specify the amount of memories of Virtual Machine -f specify the location of disks of Virtual Machine -s specify the amount of disks of Virtual Machine --vcpus=
specify the virtual CPUs
--os-type
specify types of GuestOS
--network=
specify network types of Virtual Machine.
--nographics If you' like to use more than 2 Networtk interfaces for virtual machine, add a line like "--network bridge=br1".
nographics
--location=
specify location of installation where from
--extra-args=
specify parameters that is set in kernel
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| [2] | Install with text mode, it's the same with common procedure of installation. After finishing installation, reboot first and then login prompt is shown like follwos. |
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Scientific Linux release 6.0 (Carbon) Kernel 2.6.32-71.el6.x86_64 on an x86_64 localhost.localdomain login: # login as root Password: [root@localhost ~]# |
| [3] | Move to GuestOS to HostOS with Ctrl + ] key. Move to HostOS to GuestOS with a command 'virsh console (name of virtual machine)'. |
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[root@localhost ~]# # push Ctrl + ] [root@dlp ~]# # Host's console [root@dlp ~]# virsh console www # move to Guest Connected to domain www Escape character is ^] # Enter key [root@localhost ~]# # Guest's console |
| [4] | Because after installing GuestOS from network, it is minimum settings,
it's useful to save it as a template in order to create new virtual machines later.
Please refer next procedure to create a new virtual machine from template below.
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[root@localhost ~]# # push Ctrl + ] [root@dlp ~]# # Host's console [root@dlp ~]# virt-clone --original www --name template --file /var/kvm/images/template.img Allocating 'template.img' | 20 GB 01:44 Clone 'template' created successfully. [root@dlp ~]# ll /var/kvm/images/template.img # confirm disk image -rwxr-xr-x. 1 root root 21474836480 Apr 25 21:21 /var/kvm/images/template.img [root@dlp ~]# ll /etc/libvirt/qemu/template.xml # confirm xml file -rw-------. 1 root root 1775 Apr 25 21:13 /etc/libvirt/qemu/template.xml |
| [5] | Set basic initial configuration to GuestOS first before using it. |
| [6] | Define a new Storage Pool |
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[root@dlp ~]# mkdir /etc/libvirt/storage [root@dlp ~]# vi /etc/libvirt/storage/disk01.xml # create new
<pool type='dir'> # any name <name>disk01</name> <capacity>0</capacity> <allocation>0</allocation> <available>0</available> <source> </source> <target> # specify pool directory <path>/var/kvm/images</path> <permissions> <mode>0700</mode> <owner>-1</owner> <group>-1</group> </permissions> </target> </pool> # define the pool [root@dlp ~]# virsh pool-define /etc/libvirt/storage/disk01.xml Pool disk01 defined from /etc/libvirt/storage/disk01.xml # start the pool [root@dlp ~]# virsh pool-start disk01 Pool disk01 started # set auto-start [root@dlp ~]# virsh pool-autostart disk01 Pool disk01 marked as autostarted # confirm to show the pool list [root@dlp ~]# virsh pool-list Name State Autostart ----------------------------------------- default active yes disk01 active yes # confirm to show the details [root@dlp ~]# virsh pool-info disk01 Name: disk01 UUID: c7e34241-1a81-79f1-e081-671858f0eb24 State: running Persistent: yes Autostart: yes Capacity: 283.33 GB Allocation: 84.90 GB Available: 198.43 GB |