KVM : Create Virtual Machine2022/04/27 |
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Install GuestOS and create Virtual Machine.
This example shows to install Ubuntu 22.04. |
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| [1] | On this example, Download an ISO file of Ubuntu on a directory first and Install GuestOS from the ISO on the text mode. It's OK on the console or remote connection via SSH and so on. Furthermore, Virtual Machine's images are placed at [/var/lib/libvirt/images] by default as a Storage Pool, however, this example shows to create and use a new Storage Pool.(use any place you like) |
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# create a storage pool root@dlp:~# mkdir -p /var/kvm/images root@dlp:~# virt-install \ --name ubuntu2204 \ --ram 4096 \ --disk path=/var/kvm/images/ubuntu2204.img,size=20 \ --vcpus 2 \ --os-variant ubuntu22.04 \ --network bridge=br0 \ --graphics none \ --console pty,target_type=serial \ --location /home/ubuntu-22.04-live-server-amd64.iso,kernel=casper/vmlinuz,initrd=casper/initrd \ --extra-args 'console=ttyS0,115200n8' # installation starts ================================================================================ Serial [ Help ] ================================================================================ As the installer is running on a serial console, it has started in basic mode, using only the ASCII character set and black and white colours. If you are connecting from a terminal emulator such as gnome-terminal that supports unicode and rich colours you can switch to "rich mode" which uses unicode, colours and supports many languages. You can also connect to the installer over the network via SSH, which will allow use of rich mode. [ Continue in rich mode > ] [ Continue in basic mode > ] [ View SSH instructions ] # select [Continue in basic mode] # after this, installation proceeds with the common procedure |
The example of options above means like follows. There are many options for others, read [man virt-install].
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| [2] | After finishing installation, restart computer and then login prompt is shown like follows. That's OK if logined normally with a user you set during the installation. |
Ubuntu 22.04 LTS localhost ttyS0 localhost login: ubuntu Password: Welcome to Ubuntu 22.04 LTS (GNU/Linux 5.15.0-27-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage System information as of Wed Apr 27 05:02:15 UTC 2022 System load: 0.724609375 Processes: 132 Usage of /: 26.2% of 9.75GB Users logged in: 0 Memory usage: 5% IPv4 address for enp1s0: 10.0.0.206 Swap usage: 0% 2 updates can be applied immediately. To see these additional updates run: apt list --upgradable The programs included with the Ubuntu system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. To run a command as administrator (user "root"), use "sudo <command>". See "man sudo_root" for details. ubuntu@localhost:~$ |
| [3] | Move to GuestOS to HostOS with Ctrl + ] key. Move to HostOS to GuestOS with a command [virsh console (name of virtual machine)]. |
ubuntu@localhost:~$ # Ctrl + ] key root@dlp:~# # Host's console root@dlp:~# virsh console ubuntu2204 # switch to Guest's console Connected to domain 'ubuntu2204' Escape character is ^] # Enter key ubuntu@localhost:~$ # Guest's console |
| [4] | It's easy to replicate a copy VM from current VM with a command below. |
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root@dlp:~# virt-clone --original ubuntu2204 --name template --file /var/kvm/images/template.img Allocating 'template.img' | 20 GB 00:00:04 Clone 'template' created successfully. # disk image root@dlp:~# ll /var/kvm/images/template.img -rw------- 1 root root 3618242560 Apr 27 05:08 /var/kvm/images/template.img # configuration file root@dlp:~# ll /etc/libvirt/qemu/template.xml -rw------- 1 root root 6471 Apr 27 05:07 /etc/libvirt/qemu/template.xml |
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