在本地服务器主机安装kvm环境，然后安装多个系统，供内网用户使用

环境准备

 系统centos7.9  主机24C128G 磁盘6T

1 安装准备

1.1 查看CPU是否支持虚拟化

grep -E 'svm|vmx' /proc/cpuinfo

1.2关闭SElinux

vim /etc/selinux/config                             
SELINUX=disabled

2 安装

安装kvm相关软件 

yum install qemu-kvm libvirt libvirt-python libguestfs-tools virt-install                               
#安装python-urllib3依赖时可能会报错：                      
    unpacking of archive failed on file /usr/lib/python2.7/site-packages/urllib3/packages/ssl_match_hostname: cpio: rename                      
    解决方法：                   
        cd /usr/lib/python2.7/site-packages/urllib3/packages                
        然后删除所有ssl开头的文件

3 启动服务

systemctl enable libvirtd && systemctl start libvirtd

lsmod |grep kvm 
    #查看kvm,kvm_intel模块是否加载

4 配置网络

桥接主机网络，便于后续给虚拟机分配独立的ip

4.1 修改主网卡/etc/sysconfig/network-scripts/ifcfg-ens33

    DEVICE=ens33                            
    ONBOOT=yes                          
    BRIDGE=br0

4.2 新建网桥/etc/sysconfig/network-scripts/ifcfg-br0

    TYPE=Bridge                         
    DEVICE=br0                          
    BOOTPROTO=static                            
    ONBOOT=yes                          
    IPADDR=192.168.2.106                            
    NETMASK=255.255.255.0                           
    GATEWAY=192.168.2.1                         
    DNS1=114.114.114.114

4.3 启用网络转发

    vim /etc/sysctl.conf                                    
        net.ipv4.ip_forward = 1

    sysctl -p /etc/sysctl.conf

4.4 重启网络或主机

#reboot                             
systemctl restart NetworkManager                                
systemctl restart network

4.5 关闭NetworkManager

systemctl stop NetworkManager                               
systemctl disable NetworkManager

4.6 查看网络

ip addr 输出下代表正常                             
    2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP group default qlen 1000                           
        link/ether 00:0c:29:a7:8f:9e brd ff:ff:ff:ff:ff:ff

    10: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000                          
        link/ether 00:0c:29:a7:8f:9e brd ff:ff:ff:ff:ff:ff                          
        inet 192.168.2.106/24 brd 192.168.2.255 scope global noprefixroute br0                          
           valid_lft forever preferred_lft forever                          
        inet6 fe80::20c:29ff:fea7:8f9e/64 scope link                            
           valid_lft forever preferred_lft forever

5 查看是否安装正常

systemctl status libvirtd   
virsh list

安装虚拟机见后续文章