نصب KVM در سرور لینوکس CentOS 7

1$ lscpu | grep Virtualization23Virtualization: VT-x

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

1# systemctl enable libvirtd23# systemctl start libvirtd

1# lsmod | grep -i kvm

1# brctl show23# virsh net-list

1# virsh net-dumpxml default

1# vi /etc/sysconfig/network-scripts/enp3s0

1BRIDGE=br0

1# vi /etc/sysconfig/network-scripts/ifcfg-br0

1DEVICE="br0"23# I am getting ip from DHCP server #45BOOTPROTO="dhcp"67IPV6INIT="yes"89IPV6_AUTOCONF="yes"1011ONBOOT="yes"1213TYPE="Bridge"1415DELAY="0"

1# systemctl restart NetworkManager

1# brctl show

1# cd /var/lib/libvirt/boot/23# wget https://mirrors.kernel.org/centos/7.4.1708/isos/x86_64/CentOS-7-x86_64-Minimal-1708.iso

1# wget https://mirrors.kernel.org/centos/7.4.1708/isos/x86_64/sha256sum.txt23# sha256sum -c sha256sum.txt

1# virt-install \23--virt-type=kvm \45--name centos7 \67--ram 2048 \89--vcpus=1 \1011--os-variant=centos7.0 \1213--cdrom=/var/lib/libvirt/boot/CentOS-7-x86_64-Minimal-1708.iso \1415--network=bridge=br0,model=virtio \1617--graphics vnc \1819--disk path=/var/lib/libvirt/images/centos7.qcow2,size=40,bus=virtio,format=qcow2

1# virsh dumpxml centos7 | grep vnc23<graphics type='vnc' port='5901' autoport='yes' listen='127.0.0.1'>

1$ ssh vivek@server1.cyberciti.biz -L 5901:127.0.0.1:5901

1# virt-install \23--virt-type=kvm \45--name rhel7 \67--memory=2048,maxmemory=4096 \89--vcpus=2 \1011--os-variant=rhel7.3 \1213--cdrom=/var/lib/libvirt/boot/rhel-server-7.3-x86_64-dvd.iso \1415--network=bridge=virbr0,model=virtio \1617--graphics vnc \1819--disk path=/var/lib/libvirt/images/rhel7.qcow2,size=40,bus=virtio,format=qcow2

1$ sudo virsh dumpxml rhel7 | grep vnc23<graphics type='vnc' port='5904' autoport='yes' listen='127.0.0.1'>

1$ ssh vivek@server1.cyberciti.biz -L 5904:127.0.0.1:5904

1# cd /var/lib/libvirt/boot23# wget http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2

1# D=/var/lib/libvirt/images23# VM=centos7-vm1 ## vm name ##45# mkdir -vp $D/$VM67mkdir: created directory '/var/lib/libvirt/images/centos7-vm1'

1# cd $D/$VM23# vi meta-data

1instance-id: centos7-vm123local-hostname: centos7-vm1

1# ssh-keygen -t ed25519 -C "VM Login ssh key"

1# cd $D/$VM23# vi user-data

1#cloud-config23# Hostname management45preserve_hostname: False67hostname: centos7-vm189fqdn: centos7-vm1.nixcraft.com1011# Users1213users:1415- default1617- name: vivek1819groups: ['wheel']2021shell: /bin/bash2223sudo: ALL=(ALL) NOPASSWD:ALL2425ssh-authorized-keys:2627- ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIMP3MOF2ot8MOdNXCpHem0e2Wemg4nNmL2Tio4Ik1JY VM Login ssh key2829# Configure where output will go3031output:3233all: ">> /var/log/cloud-init.log"3435# configure interaction with ssh server3637ssh_genkeytypes: ['ed25519', 'rsa']3839# Install my public ssh key to the first user-defined user configured4041# in cloud.cfg in the template (which is centos for CentOS cloud images)4243ssh_authorized_keys:4445- ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIMP3MOF2ot8MOdNXCpHem0e2Wemg4nNmL2Tio4Ik1JY VM Login ssh key4647# set timezone for VM4849timezone: Asia/Kolkata5051# Remove cloud-init5253runcmd:5455- systemctl stop network && systemctl start network5657- yum -y remove cloud-init

1# cd $D/$VM23# cp /var/lib/libvirt/boot/CentOS-7-x86_64-GenericCloud.qcow2 $VM.qcow2

1# cd $D/$VM23# export LIBGUESTFS_BACKEND=direct45# qemu-img create -f qcow2 -o preallocation=metadata $VM.new.image 20G67# virt-resize --quiet --expand /dev/sda1 $VM.qcow2 $VM.new.image

1# cd $D/$VM23# mv $VM.new.image $VM.qcow2

1# mkisofs -o $VM-cidata.iso -V cidata -J -r user-data meta-data

1# virsh pool-create-as --name $VM --type dir --target $D/$VM23Pool centos7-vm1 created

1# cd $D/$VM23# virt-install --import --name $VM \45--memory 1024 --vcpus 1 --cpu host \67--disk $VM.qcow2,format=qcow2,bus=virtio \89--disk $VM-cidata.iso,device=cdrom \1011--network bridge=virbr0,model=virtio \1213--os-type=linux \1415--os-variant=centos7.0 \1617--graphics spice \1819--noautoconsole

1# cd $D/$VM23# virsh change-media $VM hda --eject --config45# rm meta-data user-data centos7-vm1-cidata.iso

1# virsh net-dhcp-leases default

1# ssh vivek@192.168.122.85

1# virsh list --all

1# virsh dominfo vmName23# virsh dominfo centos7-vm1

1# virsh shutdown centos7-vm1

1# virsh start centos7-vm1

1# virsh autostart centos7-vm1

1# virsh reboot centos7-vm1

1# virsh reset centos7-vm1

1# virsh shutdown centos7-vm123# virsh undefine centos7-vm145# virsh pool-destroy centos7-vm167# D=/var/lib/libvirt/images89# VM=centos7-vm11011# rm -ri $D/$VM

1# virsh help | less23# virsh help | grep reboot

1virt-builder --list23virt-builder --list | grep -i fedora45virt-builder --list | grep -i debian67virt-builder --list | grep -i ubuntu89virt-builder --list | grep -i freebsd

1# virt-builder ubuntu-16.04 \23--size=20G --format qcow2 -o /var/lib/libvirt/images/ncbz01-disk01.qcow2 \45--hostname ncbz01 --network --timezone Asia/Kolkata \67--firstboot-command "dpkg-reconfigure openssh-server" \89--edit '/etc/default/grub:1011s/^GRUB_CMDLINE_LINUX_DEFAULT=.*/GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200n8"/' \1213--run-command update-grub

1[   3.9] Downloading: http://libguestfs.org/download/builder/ubuntu-16.04.xz23######################################################################## 100.0%45[ 121.7] Planning how to build this image67[ 121.7] Uncompressing89[ 126.5] Resizing (using virt-resize) to expand the disk to 20.0G1011[ 142.1] Opening the new disk1213[ 143.8] Setting a random seed1415[ 143.8] Setting the machine ID in /etc/machine-id1617[ 143.8] Setting the hostname: ncbz011819[ 144.3] Setting the timezone: Asia/Kolkata2021[ 144.3] Setting passwords2223virt-builder: Setting random password of root to 1KTLsuVx14k989eq2425[ 144.9] Finishing off2627Output file: /var/lib/libvirt/images/ncbz01-disk01.qcow22829Output size: 20.0G3031Output format: qcow23233Total usable space: 18.6G3435Free space: 17.7G (94%)

1# virt-install --import --name ncbz01 \23--ram 2048 \45--vcpu 2 \67--disk path=/var/lib/libvirt/images/ncbz01-disk01.qcow2,format=qcow2 \89--os-variant ubuntu17.04 \1011--network=bridge=virbr0,model=virtio \1213--noautoconsole

1# virsh start ncbz01

1# virsh console ncbz01