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:
• Configure Local Yum Repository in RHE...
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 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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