Configure Kernel Based Virtual Machine (KVM) on RHEL 7 or CentOS 7

Configure Kernel Based Virtual Machine (KVM) on RHEL 7 or CentOS 7 | Install & Configure KVM in RHEL

KVM:
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KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko.

Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc.

KVM is open source software. The kernel component of KVM is included in mainline Linux, as of 2.6.20. The userspace component of KVM is included in mainline QEMU, as of 1.3.

How does KVM work:
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KVM converts Linux into a type-1 (bare-metal) hypervisor. All hypervisors need some operating system-level components—such as a memory manager, process scheduler, input/output (I/O) stack, device drivers, security manager, a network stack, and more—to run VMs. KVM has all these components because it’s part of the Linux kernel. Every VM is implemented as a regular Linux process, scheduled by the standard Linux scheduler, with dedicated virtual hardware like a network card, graphics adapter, CPU(s), memory, and disks.

Install KVM in CentOS 7:
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# setenforce 0

# uname -a

# cat /etc/CentOS-release

# grep -E ‘svm|vmx’ /proc/cpuinfo

# yum repolist
watch this video to configure it in RHEL 7:
https://youtu.be/-N09WSCNcso

# yum install -y qemu-kvm libvirt libvirt-python libguestfs-tools virt-install

# systemctl start libvirtd

# systemctl status libvirtd

# ifconfig

# vim /etc/sysconfig/network-scripts/ifcfg-ens33
#IPADDR
#NETMASK
#GATEWAY
BRIDGE=virbr0

# cp -p /etc/sysconfig/network-scripts/ifcfg-ens033 /etc/sysconfig/network-scripts/ifcfg-virbr0

# vim /etc/sysconfig/network-scripts/ifcfg-virbr0
TYPE=BRIDGE
IPADDR
NETMASK
GATEWAY
DEVICE=virbr0

# ll /usr/lib/sysctl.d/60-libvirtd.conf

# rpm -qf /usr/lib/sysctl.d/60-libvirtd.conf

# vim /usr/lib/sysctl.d/60-libvirtd.conf
net.ipv4.ip_forward = 1

# /sbin/sysctl -w /usr/lib/sysctl.d/60-libvirtd.conf

# /sbin/sysctl -p /usr/lib/sysctl.d/60-libvirtd.conf

# ifconfig virbr0

# virsh net-edit default
192.168.1.140
dhcp range 192.168.1.200 192.168.1.254

# vim /etc/sysconfig/network-scripts/route-virbr0
192.168.1.0/24 via 192.168.1.140 dev virbr0

# init 6

# systemctl status libvirtd

# ifconfig -a

# osinfo-query os | more

# osinfo-query os | grep -i centos

# df -hT

# ll /tmp/CentOS-7-x86_64-DVD-1708.iso

# chmod 775 /tmp/CentOS-7-x86_64-DVD-1708.iso

# ll /kvm

# virt-install –name KVMac –description “CENTOS7 for KVMac” –os-type=Linux –os-variant=centos7.0 –ram=1024 –vcpus=1 –disk path=/kvm/KVMac.img,bus=virtio,size=10 –graphics none –console pty,target_type=serial –location /tmp/CentOS-7-x86_64-DVD-1708.iso –network bridge:virbr0 –extra-args console=ttyS0

# virsh list –all

# virsh dominfo KVMac

# virsh shutdown KVMac

# virsh console KVMac

# virsh list –all

# virsh start KVMac

# virsh console KVMac

# virsh list

# virsh list –all

# virt-clone –connect qemu:///system –original KVMac –name vm3 -f /kvm/KVMac2.img

# virsh list –all

# virsh start KVMac2

# virsh console KVMac2

# ifconfig

# nslookup 8.8.8.8

# netstat -nr

You are done.
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