001 - KVM-host1 - Installation

Basic Info:

root@kvm-host1:~# hostname 
kvm-host1.ab.lab

root@kvm-host1:~# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 9.4 (stretch)
Release: 9.4
Codename: stretch

root@kvm-host1:~# cat /etc/resolv.conf 
nameserver 192.168.75.1
search ab.lab

root@kvm-host1:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.75.1    0.0.0.0         UG    0      0        0 ens3
192.168.75.0    0.0.0.0         255.255.255.0   U     0      0        0 ens3

root@kvm-host1:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:94:05:d7 brd ff:ff:ff:ff:ff:ff
    inet 192.168.75.170/24 brd 192.168.75.155 scope global ens3
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe94:5d7/64 scope link 
       valid_lft forever preferred_lft forever

root@kvm-host1:~# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

#
allow-hotplug ens3
iface ens3 inet static
  address 192.168.75.170
  network 192.168.75.0
  netmask 255.255.255.0
  broadcast 192.168.75.155
  gateway 192.168.75.1
  dns-nameservers 192.168.75.1

Check required CPU Flags ('vmx' for Intel or 'svm' for AMD):

root@kvm-host1:~# grep -e vmx -e svm /proc/cpuinfo 
flags  : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl eagerfpu pni pclmulqdq vmx ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust smep erms xsaveopt
flags  : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl eagerfpu pni pclmulqdq vmx ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust smep erms xsaveopt
flags  : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl eagerfpu pni pclmulqdq vmx ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust smep erms xsaveopt
flags  : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl eagerfpu pni pclmulqdq vmx ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust smep erms xsaveopt

Install KVM:

root@kvm-host1:~# apt-get install qemu-kvm

Install 'bridge-utils' package:

root@kvm-host1:~# apt-get install bridge-utils

Check the installed packages:

root@kvm-host1:~# dpkg -l | grep qemu
ii  ipxe-qemu                             1.0.0+git-20161027.b991c67-1                all          PXE boot firmware - ROM images for qemu
ii  qemu-kvm                              1:2.8+dfsg-6+deb9u3                         amd64        QEMU Full virtualization on x86 hardware
ii  qemu-system-common                    1:2.8+dfsg-6+deb9u3                         amd64        QEMU full system emulation binaries (common files)
ii  qemu-system-x86                       1:2.8+dfsg-6+deb9u3                         amd64        QEMU full system emulation binaries (x86)
ii  qemu-utils                            1:2.8+dfsg-6+deb9u3                         amd64        QEMU utilities

root@kvm-host1:~# dpkg -l | grep kvm
ii  qemu-kvm                              1:2.8+dfsg-6+deb9u3                         amd64        QEMU Full virtualization on x86 hardware

root@kvm-host1:~# dpkg -l | grep  bridge-utils
ii  bridge-utils                          1.5-13+deb9u1                               amd64        Utilities for configuring the Linux Ethernet bridge

Basic info about some main packages:

root@kvm-host1:~# dpkg -L qemu-system-common  

root@kvm-host1:~# dpkg -L qemu-utils

root@kvm-host1:~# dpkg -L bridge-utils

Check if KVM module is loaded:

root@kvm-host1:~# lsmod | grep kvm
kvm_intel             192512  0
kvm                   593920  1 kvm_intel
irqbypass              16384  1 kvm

Create Bridge

Network before

root@kvm-host1:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:94:05:d7 brd ff:ff:ff:ff:ff:ff
    inet 192.168.75.170/24 brd 192.168.75.155 scope global ens3
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe94:5d7/64 scope link 
       valid_lft forever preferred_lft forever

root@kvm-host1:~# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

#
allow-hotplug ens3
iface ens3 inet static
  address 192.168.75.170
  network 192.168.75.0
  netmask 255.255.255.0
  broadcast 192.168.75.155
  gateway 192.168.75.1
  dns-nameservers 192.168.75.1

root@kvm-host1:~# cp -av  /etc/network/interfaces /root/orig_files/interfaces_before_bridge
'/etc/network/interfaces' -> '/root/orig_files/interfaces_before_bridge'

After Bridge:

root@kvm-host1:~# cat   /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# Static network configuration
#allow-hotplug ens3
#iface ens3 inet static
#  address 192.168.75.170
#  network 192.168.75.0
#  netmask 255.255.255.0
#  broadcast 192.168.75.155
#  gateway 192.168.75.1
#  dns-nameservers 192.168.75.1

# br0 will be using ens3
allow-hotplug ens3
iface ens3 inet static

auto br0
iface br0 inet static
  address 192.168.75.170
  network 192.168.75.0
  netmask 255.255.255.0
  broadcast 192.168.75.155
  gateway 192.168.75.1
  dns-nameservers 192.168.75.1
  #Bridge configuration
  bridge_ports ens3
  bridge_stp off
  bridge_maxwait 0
  bridge_fd 0

Reboot and check results:

root@kvm-host1:~# reboot

root@kvm-host1:~# ip a
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens3:  mtu 1500 qdisc pfifo_fast master br0 state UP group default qlen 1000
    link/ether 52:54:00:94:05:d7 brd ff:ff:ff:ff:ff:ff
3: br0:  mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 52:54:00:94:05:d7 brd ff:ff:ff:ff:ff:ff
    inet 192.168.75.170/24 brd 192.168.75.155 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe94:5d7/64 scope link 
       valid_lft forever preferred_lft forever

root@kvm-host1:~#  route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.75.1    0.0.0.0         UG    0      0        0 br0
192.168.75.0    0.0.0.0         255.255.255.0   U     0      0        0 br0

root@kvm-host1:~# brctl show
bridge name bridge id  STP enabled interfaces
br0  8000.5254009405d7 no  ens3

Install required packages to manage VMs from GUI and CLI:

root@kvm-host1:~# apt-get install virt-manager

root@kvm-host1:~# apt-get install virtinst

root@kvm-host1:~# dpkg -L virt-manager | grep bin
/usr/bin
/usr/bin/virt-manager

root@kvm-host1:~# dpkg -L virtinst | grep bin
/usr/bin
/usr/bin/virt-clone
/usr/bin/virt-convert
/usr/bin/virt-install
/usr/bin/virt-xml