Install KVM on CentOS 7 and create a virtual machine

• Install KVM

[ root@kvm-centos7 ~]# yum -y install qemu-kvm libvirt virt-install bridge-utils

# Make sure the module is loaded

[ root@kvm-centos7 ~]# lsmod | grep kvm 
kvm_intel             1701810 
kvm                   5546091 kvm_intel
irqbypass              135031 kvm

[ root@kvm-centos7~]# systemctl start libvirtd 
[ root@kvm-centos7~]# systemctl enable libvirtd 

• Configure bridged network for KVM virtual machine

Reference: http://blog.csdn.net/wh211212/article/details/54135565
Environment: OS: CentOS Linux release 7.3.1611 (Core) Network: Dual network card bonding Hardware: DELL R420, 16G 1CPU 4 cores

# Network card configuration, new ifcfg-bro, and then modify the relevant configuration as follows:
[ root@kvm-centos7 ~]# cd /etc/sysconfig/network-scripts/[root@kvm-centos7 network-scripts]# cat ifcfg-br0 
DEVICE="br0"
ONBOOT="yes"
TYPE="Bridge"
BOOTPROTO=static
IPADDR=192.168.1.133   #customize
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DEFROUTE=yes

# ifcfg-Bond0 configuration file modification
[ root@kvm-centos7 network-scripts]# cat ifcfg-bond0 
DEVICE=bond0
TYPE=Ethernet
NAME=bond0
BONDING_MASTER=yes
BOOTPROTO=none
BRIDGE=br0
ONBOOT=yes
BONDING_OPTS="mode=5 miimon=100"

After the bridged network configuration is complete, restart the network service, check ifconfig as follows:

[ root@kvm-centos7 network-scripts]# systemctl restart network

Check ifconfig to see if the network service is normal

Create a virtual machine##

Install GuestOS and create a virtual machine. This example shows installing CentOS 7

• Install GuestOS in text mode over the network. The image of the virtual machine is placed in /var/lib/libvirt/images as the storage pool by default, but this example shows the creation and use of a new storage pool.

[ root@kvm-centos7~]# mkdir -p /var/kvm/images #Create a new storage pool

[ root@kvm-centos7 ~]# virt-install \
- - name elk \
- - ram 4096 \
- - disk path=/var/kvm/images/elk.img,size=30 \
- - vcpus 2 \
- - os-type linux \
- - os-variant rhel7 \
- - network bridge=br0 \
- - graphics none \
- - console pty,target_type=serial \
- - location 'http://mirrors.aliyun.com/centos/7/os/x86_64/' \
- - extra-args 'console=ttyS0,115200n8 serial'

The normal loading status is as follows:

The meanings of the relevant parameters specified above are as follows: For more reference man virt-install

- - name specifies the name of the virtual machine
- - ram specifies Virtual Machine
- - Disk memory path= xxx，size = xxx 
' path ='⇒Specify the virtual machine
size ='⇒Specify the number of disks of the virtual machine
- - vcpus specifies the virtual CPU
- - os-type specifies the type of GuestOS
- - os-variant specifies the type of GuestOS-It may be confirmed that the following command osinfo is used in the list-query os 
- - network specifies the network type of the virtual machine
- - graphics specifies the type of graphics. If set to "None", it means non-graphics.
- - console specifies the console type
- - location specifies the location of the installation, where from--extra-args specifies the parameters set in the kernel

• Installation in text mode is the same as the usual installation steps. After the installation is complete, first restart, and then the login prompt is shown below.

https://blog.csdn.net/github_27924183/article/details/76914322?locationNum=5&fps=1