centos7 安装kvm

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