Linux学习-虚拟化平台安装和使用

注：系统使用Rock8.6

下载链接

通过百度网盘分享的文件：cirros.qcow2，node_base.xml等2个文件
链接：https://pan.baidu.com/s/1hupGQsMjrXMgngCy3lQLhw?pwd=hlr6 
提取码：hlr6

[root@harbor ~]# cat /etc/redhat-release
Rocky Linux release 8.6 (Green Obsidian)

验证 ecs 是否支持虚拟化

[root@harbor ~]# grep -Po "vmx|svm" /proc/cpuinfo
vmx
vmx
vmx
vmx
[root@harbor ~]# lsmod | grep kvm
kvm_intel             339968  4
kvm                   905216  1 kvm_intel
irqbypass              16384  4 kvm

安装虚拟化平台

安装服务

[root@harbor ~]# dnf install -y qemu-kvm libvirt-daemon libvirt-client libvirt-daemon-driver-qemu libvirt-daemon-driver-network dnsmasq
[root@harbor ~]# systemctl enable --now libvirtd
[root@harbor ~]# virsh version
Compiled against library: libvirt 8.0.0
Using library: libvirt 8.0.0
Using API: QEMU 8.0.0
Running hypervisor: QEMU 6.2.0

创建网桥

命令	描述
virsh net-list [--all]	列出虚拟网络
virsh net-start	启动虚拟交换机
virsh net-destroy	强制停止虚拟交换机
virsh net-define	根据xml文件创建虚拟网络
virsh net-undefine	删除一个虚拟网络设备
virsh net-edit	修改虚拟交换机的配置
virsh net-autostart	设置开机自启动

# 官网手册: https://libvirt.org/docs.html
[root@harbor ~]# vim /etc/libvirt/qemu/networks/vbr.xml
<network><name>vbr</name><uuid>335ef8bf-f349-4194-9b79-687b56df7614</uuid><forward mode='nat'/><bridge name='vbr' stp='on' delay='0'/><mac address='52:54:00:14:a2:43'/><ip address='192.168.100.254' netmask='255.255.255.0'><dhcp><range start='192.168.100.128' end='192.168.100.200'/></dhcp></ip>
</network>
[root@harbor ~]# virsh net-define /etc/libvirt/qemu/networks/vbr.xml
Network vbr defined from /etc/libvirt/qemu/networks/vbr.xml
[root@harbor ~]# virsh net-autostart vbr
Network vbr marked as autostarted
# 启动网桥
[root@harbor ~]# virsh net-start vbr
Network vbr started
# 验证状态
[root@harbor ~]# virsh net-list --allName   State    Autostart   Persistent
-----------------------------------------vbr    active   yes         yes[root@harbor ~]# ifconfig vbr
vbr: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 192.168.100.254  netmask 255.255.255.0  broadcast 192.168.100.255ether 52:54:00:14:a2:43  txqueuelen 1000  (Ethernet)RX packets 27  bytes 2264 (2.2 KiB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 15  bytes 1564 (1.5 KiB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Linux 虚拟机

虚拟机的构成

虚拟机配置文件(*.xml)
- 文件默认路径：/etc/libvirt/qemu/
- 用途：定义了虚拟机的设备，如CPU，内存，网卡等资源
存储文件(*.img)
- 文件默认路径：/var/lib/libvirt/imags/
- 用途：仿真虚拟机磁盘，存储所有数据信息

创建虚拟机磁盘

# cirros.qcow2见文章首部下载链接
[root@harbor ~]# cp cirros.qcow2 /var/lib/libvirt/images/
[root@harbor ~]# cd /var/lib/libvirt/images/
[root@harbor ~]# qemu-img create -F qcow2 -f qcow2 -b cirros.qcow2 vmhost.img 20G
[root@harbor ~]# qemu-img info vmhost.img #查看信息

虚拟机配置文件

<domain type='kvm'><name>vmhost</name><memory unit='KB'>1048576</memory><currentMemory unit='KB'>1048576</currentMemory><vcpu placement='static'>2</vcpu><os><type arch='x86_64' machine='pc'>hvm</type><boot dev='hd'/><bootmenu enable='yes'/><bios useserial='yes'/></os><features><acpi/><apic/></features><cpu mode='host-passthrough'></cpu><clock offset='localtime'/><on_poweroff>destroy</on_poweroff><on_reboot>restart</on_reboot><on_crash>restart</on_crash><devices><emulator>/usr/libexec/qemu-kvm</emulator><disk type='file' device='disk'><driver name='qemu' type='qcow2'/><source file='/var/lib/libvirt/images/vmhost.img'/><target dev='vda' bus='virtio'/></disk><interface type='bridge'><source bridge='vbr'/><model type='virtio'/></interface><channel type='unix'><target type='virtio' name='org.qemu.guest_agent.0'/></channel><serial type='pty'></serial><console type='pty'><target type='serial'/></console><memballoon model='virtio'></memballoon></devices>
</domain>

创建虚拟机

命令	说明
virsh list [--all]	列出虚拟机
virsh start/shutdown	启动/关闭虚拟机
virsh destroy	强制停止虚拟机
virsh define/undefine	创建/删除虚拟机
virsh console	连接虚拟机的 console

[root@harbor ~]# virsh define /etc/libvirt/qemu/vmhost.xml
Domain vmhost defined from /etc/libvirt/qemu/vmhost.xml
[root@harbor ~]# virsh list --allId    Name                           State
-----------------------------------------------------     vmhost                         shut off
[root@harbor ~]# virsh start vmhost
Domain vmhost started
[root@harbor ~]# virsh console vmhost # 两次回车
Connected to domain vmhost
Escape character is ^]login as 'cirros' user. default password: 'gocubsgo'. use 'sudo' for root.
cirros login: 
退出使用 ctrl + ]

常用管理命令

命令	说明
virsh edit	修改虚拟机的配置
virsh autostart	设置虚拟机自启动
virsh dominfo	查看虚拟机摘要信息
virsh domiflist	查看虚拟机网卡信息
virsh domblklist	查看虚拟机硬盘信息