[kvm] install KVM

Environmental Science : RHEL7.6

1. Check whether the server has successfully started virtualization

# egrep -o 'vmx|svm' /proc/cpuinfo  ->  retrieval /proc/cpuinfo Whether the document contains vmx or svm character string 
vmx
vmx
vmx
vmx
…

If the command displays the result （vmx or svm）, Is the open state

2. Turn off firewall

# systemctl stop firewalld
# systemctl disable firewalld  ->  Remove the firewall service from the boot list 

3. close selinux

Carry out orders getenforce see selinux state

# getenforce
Disabled

If the result of execution is enforcing ==>  Temporarily Closed selinux

# setenforce 0  ->  The status changes to permissive

Permanent ban selinux（ Restart and take effect ）

# vim /etc/selinux/config  ==>  take  SELINUX=enforcing  Change it to  SELINUX=disabed

perform reboot Command to restart the machine

4. To configure yum Source

# cat /etc/yum.repos.d/installpkg.repo
[INSTALLPKG]
name=INSTALLPKG
baseurl=file:///var/www/html/updates/x86_64/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

5. install KVM

# yum --disablerepo=* --enablerepo=INSTALLPKG install qemu-kvm qemu-kvm-tools qemu-img virt-manager libvirt libvirt-python libvirt-client virt-install virt-viewer bridge-utils libguestfs-tools

6. start-up libvirtd service

# systemctl enable libvirtd
# systemctl start libvirtd

7. confirm kvm already installed
Use lsmod The command confirms that it is loaded  KVM modular

# lsmod | grep -i kvm
kvm_intel             183621  54
kvm                   586948  1 kvm_intel
irqbypass              13503  35 kvm

6. Configure bridge network

Configure the network card before bridging the network ifcfg-eth0 Content reference of

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=eth0
UUID=b108dded-2234-4cb5-5678-e89e69f16cdd
DEVICE=eno1
ONBOOT=yes
IPADDR=10.100.173.33
NETMASK=255.255.255.192
GATEWAY=10.100.173.1

newly build ifcfg-br0 file

DEVICE=br0
ONBOOT=yes
BOOTPROTO=static
TYPE=Bridge
IPADDR=10.100.173.33
NETMASK=255.255.255.192
GATEWAY=10.100.173.1
DELAY=0

to update ifcfg-eth0 The content of

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=eth0
UUID=b108dded-2234-4cb5-5678-e89e69f16cdd
DEVICE=eth0
ONBOOT=yes
BRIDGE=br0

And then I use  systemctl status network Restart the network , therefore ssh Disconnected and unable to connect to the server ==

from iDRAC go in perform systemctl restart NetworkManager Then it can be connected again

# systemctl restart NetworkManager

use brctl Command to view Bridge Information

# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.20040ff6cd4c       no              eth0
                                                        vnet0
                                                        vnet1
docker0         8000.0242c38598ca       no
virbr0          8000.525400ad9637       yes             virbr0-nic

View version

# virsh -c qemu:///system list
 Id    Name                           State
----------------------------------------------------
# virsh -version
4.5.0
# virt-install --version
1.5.0

Reference material :
install KVM  https://www.cnblogs.com/asfor/p/12684781.html
CnetOS7/RHEL7 install KVM  https://www.cnblogs.com/kcxg/p/11049829.html