Using KVM to create three virtual machines that can communicate with local area network

Material preparation

One set installed kvm Server for
The operating system image of the virtual machine needs to be downloaded in advance in the server Here is centos-7-x86_64-dvd-2009.iso

matters needing attention

Because the three virtual machines need to be connected to the LAN , The network card of the server needs to be configured with the network bridge mode

Server network card configuration bridge process

1 #  Get into /etc/sysconfig/network-scripts
cd /etc/sysconfig/network-scripts

#  Check which network cards are available 
ll | grep ifcfg
-rw-r--r--  1 root root    39 Jun  1 21:56 ifcfg-em1
-rw-r--r--. 1 root root   275 May 31 08:00 ifcfg-em2
-rw-r--r--. 1 root root   275 May 31 08:00 ifcfg-em3
-rw-r--r--. 1 root root   275 May 31 08:00 ifcfg-em4
-rw-r--r--. 1 root root   254 May 22  2020 ifcfg-lo

#  My server broadband cable is connected to the first network port , So it is ifcfg-em1
#  Copy a network card configuration file as br0  Create a bridge profile 
cp ifcfg-em1 ifcfg-br0
#  Edit bridge file 
vi ifcfg-br0
====>  The following is the modified file content 
TYPE="BRIDGE"  # Ethernet type 
BOOTPROTO="none" # static state ip
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="br0"
UUID="em1 Of itself uuid"
DEVICE="br0"  # The network card name   It should be consistent with the file name of the network card 
ONBOOT="yes"
IPV6_PRIVACY="no"
IPADDR="192.168.xx.xx"  # ip  Unoccupied in the network segment of the local area network ip All can use 
GATEWAY="192.168.xx.1"  #  Network segment 
BROADCAST="192.168.xx.254" #  Broadcast address 
NETMASK="255.255.255.0" #  Subnet mask 
DNS1="8.8.8.8" # dns analysis 

To configure em1 Network card file

vi ifcfg-em1
===>   The following is the contents of the modified file 
DEVICE="em1"
ONBOOT="yes"
BRIDGE="br0"

To create a bridge The name of the bridge should be the same as the bridge name set in the bridge configuration file

brctl addbr br0 

Bind the network card to the network bridge

brctl addif br0 em1

Check out the bridge

brctl show
====>
bridge name     bridge id               STP enabled     interfaces
br0             xxxxxxxx                    no              em1

Restart the network

systemctl restart network

Test whether the network can ping through

ping www.baidu.com
===>
[[email protected] network-scripts]# ping www.baidu.com
PING www.wshifen.com (**.***.***.***) 56(84) bytes of data.
64 bytes from **** (**.***.***.***): icmp_seq=1 ttl=48 time=239 ms
64 bytes from **** (**.***.***.***): icmp_seq=2 ttl=48 time=236 ms
64 bytes from **** (**.***.***.***): icmp_seq=3 ttl=48 time=244 ms
64 bytes from **** (**.***.***.***): icmp_seq=4 ttl=48 time=245 ms
64 bytes from **** (**.***.***.***): icmp_seq=5 ttl=48 time=239 ms

Here, the bridge mode of the server is successfully configured , Next you can use virt-manager The remote management tool creates three virtual machines

start-up virt-manager Remote management tool

#  Execute the following command in the server , A visualization window will appear after a while 
virt-manager

Create a new virtual machine

2 Choose to install from a local image file

3 Select a specific image

3 Configure memory and cpu Check the number

Select the created or created disk

Then you will enter the installation interface of the operating system , Don't stick ,

After the system installation of the virtual machine is completed , Double click in kvm A virtual machine of , choice view–detail,

Select Bridge

Configure virtual machine static ip And restart the network

cd /etc/sysconfig/network-scripts
vi ifcfg- network card 
===>
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="static"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME=" adapter name "
UUID=" Self contained uuid"
DEVICE=" adapter name "
ONBOOT="yes"
IPV6_PRIVACY="no"
IPADDR="192.168.**.**"
GATEWAY="192.168.**.1"
BROADCAST="192.168.**.254"
NETMASK="255.255.255.0"
DNS1="8.8.8.8"


#  Restart the network 
systemctl restart network

#  Test whether it can ping LAN 
ping www.baidu.com

At this point, the configuration of a virtual machine is over , The remaining two operate in the same way