KVM : Create Virtual Machine2023/02/28 |
Install GuestOS and Create a Virtual Machine.
This example shows to create VM with installing AlmaLinux 9. |
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[1] | On this example, Download an ISO file of AlmaLinux 9 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. (OK to use any place you like) |
# create a Storage Pool directory [root@dlp ~]# mkdir -p /var/kvm/images [root@dlp ~]# virt-install \
Starting install...
--name almalinux9 \
--ram 4096 \ --disk path=/var/kvm/images/almalinux9.img,size=20 \ --vcpus 2 \ --os-variant almalinux9 \ --network bridge=br0 \ --graphics none \ --console pty,target_type=serial \ --location /home/AlmaLinux-9-latest-x86_64-dvd.iso \ --extra-args 'console=ttyS0,115200n8' # installation starts
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The example of options above means like follows. There are many options for others, make sure with [man virt-install].
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[2] | For installing on text mode, it's the same with common installation procedure. After finishing installation, restart computer and then login prompt is shown like follwos. |
AlmaLinux 9.1 (Lime Lynx) Kernel 5.14.0-162.6.1.el9_1.x86_64 on an x86_64 Activate the web console with: systemctl enable --now cockpit.socket localhost login: |
[3] | Move to GuestOS to HostOS with Ctrl + ] key. Move to HostOS to GuestOS with a command [virsh console (name of virtual machine)]. |
[root@localhost ~]# # Ctrl + ] key [root@dlp ~]# # Host's console [root@dlp ~]# virsh console almalinux9 # switch to Guest's console Connected to domain almalinux9 Escape character is ^] # Enter key [root@localhost ~]# # Guest's console |
[4] | It's easy to replicate a copy VM from current VM with a command below. |
[root@dlp ~]# virt-clone --original almalinux9 --name template --file /var/kvm/images/template.img Allocating 'template.img' | 20 GB 00:02 Clone 'template' created successfully. # disk image [root@dlp ~]# ll /var/kvm/images/template.img -rw-------. 1 root root 2092433408 Jan 19 13:58 /var/kvm/images/template.img # configuration file [root@dlp ~]# ll /etc/libvirt/qemu/template.xml -rw-------. 1 root root 4962 Jan 19 13:58 /etc/libvirt/qemu/template.xml |
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