KVM : Create Virtual Machines2020/11/03 |
Install GuestOS and Create a Virtual Machine. This example shows to create VM with installing Fedora 33.
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[1] | On this example, Download an ISO file of Fedora 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, but this example shows to create and use a new Storage Pool.(use any place you like) |
# create a Storage Pool directory [root@dlp ~]# mkdir -p /var/kvm/images [root@dlp ~]# virt-install \
Starting install...
--name fedora33 \
--ram 4096 \ --disk path=/var/kvm/images/fedora33.img,size=20 \ --vcpus 2 \ --os-type linux \ --os-variant fedora33 \ --network bridge=br0 \ --graphics none \ --console pty,target_type=serial \ --location /home/Fedora-Server-dvd-x86_64-33-1.2.iso \ --extra-args 'console=ttyS0,115200n8 serial' # 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].
--name
specify the name of Virtual Machine
--ram
specify the amount of memory of Virtual Machine
--disk path=xxx ,size=xxx
[path=] specify the location of disks of Virtual Machine (default is [/var/lib/libvirt/images])
--vcpus[size=] specify the amount of disk of Virtual Machine
specify the virtual CPUs
--os-type
specify the type of GuestOS
--os-variant
specify the kind of GuestOS
--networkpossible to show the list of OS with follows [# osinfo-query os]
specify network type of Virtual Machine
--graphics
specify the kind of graphics. if set [none], it means nographics
--console
specify the console type
--location
specify the location of installation source where from
--extra-args
specify parameters that are set in Kernel
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[2] | For installing on text mode, it's the same with common procedure of installation. After finishing installation, restart computer and then login prompt is shown like follwos. |
Fedora 33 (Server Edition) Kernel 5.8.15-301.fc33.x86_64 on an x86_64 (ttyS0) Web console: https://localhost:9090/ or https://10.0.0.217:9090/ 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 fedora33 # switch to Guest's console Connected to domain fedora33 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 fedora33 --name template --file /var/kvm/images/template.img Allocating 'template.img' | 20 GB 00:03 Clone 'template' created successfully. # disk image [root@dlp ~]# ll /var/kvm/images/template.img -rw-------. 1 root root 2101411840 Nov 3 14:54 /var/kvm/images/template.img # configuration file [root@dlp ~]# ll /etc/libvirt/qemu/template.xml -rw-------. 1 root root 4931 Nov 3 14:54 /etc/libvirt/qemu/template.xml |
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