KVM and virtualization, virsh and virt-manager

Find if CPU support:
# cat /proc/cpuinfo
i’m interested about flags line
Intel base CPU have VMX
# lsmod | grep kvm
There are 2 modules: one from generic linux and another one from specific platform support.
Check the status of libvirtd
# system status libvirtd
Check the link:
# ip link show
This device virbr0 (virtual bridge) is special created for virtualization. Is like an embedded bridge in order to share connection.
To support KVM need 64 bit kernel:
# arch
Support the CPU:
# grep vmx /proc/cpuinfo
Need libvirtd available:
# systemctl status libvirtd
Virtualization shell:
# virsh
After starting the program, type “help” in order to see the list with options.
Basic commands:
List what VM running:
# virsh list
List existing VM:
# virsh list –all
# virsh distroy machineName – is stopping immediately.
# virsh start machineName
All VM have configuration files.
the files are into:
# cd /etc/libvirt
Those are the configurations for libvirtd
QEMU is an emulator which is old which is used in KVM environment.
cd /etc/libvirt/qemu
Those are configuration files for VM.
# vi vmName.xml
The best way to edit the configuration is by using virsh:
# virsh edit vmName
In this file are details about VM and also the disk image file which is not the best as performance but easiest to implement.
Check the network of virtual VM:
# ip link show

Start virt-manager:
# virt-manager

# yum install -y kvm libvirt virt-manager qemu-kvm