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KVM虚拟机

作者:互联网

KVM虚拟化

虚拟化介绍

虚拟化是云计算的基础。简单的说,虚拟化使得在一台物理的服务器上可以跑多台虚拟机,虚拟机共享物理机的 CPU、内存、IO 硬件资源,但逻辑上虚拟机之间是相互隔离的。

物理机我们一般称为宿主机(Host),宿主机上面的虚拟机称为客户机(Guest)。

那么 Host 是如何将自己的硬件资源虚拟化,并提供给 Guest 使用的呢? 这个主要是通过一个叫做 Hypervisor 的程序实现的。

根据 Hypervisor 的实现方式和所处的位置,虚拟化又分为两种:

全虚拟化:

Hypervisor 直接安装在物理机上,多个虚拟机在 Hypervisor 上运行。Hypervisor 实现方式一般是一个特殊定制的 Linux 系统。Xen 和 VMWare 的 ESXi 都属于这个类型

 

半虚拟化:

物理机上首先安装常规的操作系统,比如 Redhat、Ubuntu 和 Windows。Hypervisor 作为 OS 上的一个程序模块运行,并对管理虚拟机进行管理。KVM、VirtualBox 和 VMWare Workstation 都属于这个类型

 

理论上讲: 全虚拟化一般对硬件虚拟化功能进行了特别优化,性能上比半虚拟化要高; 半虚拟化因为基于普通的操作系统,会比较灵活,比如支持虚拟机嵌套。嵌套意味着可以在KVM虚拟机中再运行KVM。

KVM介绍

kVM 全称是 Kernel-Based Virtual Machine。也就是说 KVM 是基于 Linux 内核实现的。 KVM有一个内核模块叫 kvm.ko,只用于管理虚拟 CPU 和内存。

那 IO 的虚拟化,比如存储和网络设备则是由 Linux 内核与Qemu来实现。

作为一个 Hypervisor,KVM 本身只关注虚拟机调度和内存管理这两个方面。IO 外设的任务交给 Linux 内核和 Qemu。

大家在网上看 KVM 相关文章的时候肯定经常会看到 Libvirt 这个东西。

Libvirt 就是 KVM 的管理工具。

其实,Libvirt 除了能管理 KVM 这种 Hypervisor,还能管理 Xen,VirtualBox 等。

Libvirt 包含 3 个东西:后台 daemon 程序 libvirtd、API 库和命令行工具 virsh

KVM安装

关闭防火墙selinux
[root@localhost ~]# systemctl disable --now firewalld
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@localhost ~]# vim /etc/selinux/config 
[root@localhost ~]# reboot 
[root@localhost ~]# getenforce 0
Disabled

配置网络源
[root@localhost ~]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# curl -o /etc/yum.repos.d/CentOS7-Base-163.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  1572  100  1572    0     0   2019      0 --:--:-- --:--:-- --:--:--  2017
[root@localhost yum.repos.d]# sed -i 's/\$releasever/7/g' /etc/yum.repos.d/CentOS7-Base-163.repo
[root@localhost yum.repos.d]# sed -i 's/^enabled=.*/enabled=1/g' /etc/yum.repos.d/CentOS7-Base-163.repo
[root@localhost yum.repos.d]# yum -y install epel-release vim wget net-tools unzip zip gcc gcc-c++

验证CPU是否支持KVM
[root@localhost ~]# egrep -o 'vmx|svm' /proc/cpuinfo
vmx
vmx
vmx
vmx

kvm安装
[root@localhost ~]# yum -y install qemu-kvm qemu-kvm-common qemu-img virt-manager libvirt python3-libvirt libvirt-client virt-install virt-viewer bridge-utils libguestfs-tools

[root@localhost ~]# cd /etc/sysconfig/network-scripts
[root@localhost network-scripts]# ls
ifcfg-ens33  ifdown-isdn      ifup          ifup-plip      ifup-tunnel
ifcfg-lo     ifdown-post      ifup-aliases  ifup-plusb     ifup-wireless
ifdown       ifdown-ppp       ifup-bnep     ifup-post      init.ipv6-global
ifdown-bnep  ifdown-routes    ifup-eth      ifup-ppp       network-functions
ifdown-eth   ifdown-sit       ifup-ib       ifup-routes    network-functions-ipv6
ifdown-ib    ifdown-Team      ifup-ippp     ifup-sit
ifdown-ippp  ifdown-TeamPort  ifup-ipv6     ifup-Team
ifdown-ipv6  ifdown-tunnel    ifup-isdn     ifup-TeamPort
[root@localhost network-scripts]# cp ifcfg-ens33 ifcfg-br0
[root@localhost network-scripts]# cat ifcfg-br0 
TYPE="Bridge"
BOOTPROTO="static"
DEVICE="br0"
NAME="br0"
ONBOOT="yes"
IPADDR=192.168.145.149
GATEWAY=192.168.145.2
NETMASK=255.255.255.0
DNS1=192.168.145.2
DNS2=114.114.114.114
[root@localhost network-scripts]# cat ifcfg-ens33 
TYPE="Ethernet"
BOOTPROTO="static"
DEVICE="ens33"
NAME="ens33"
ONBOOT="yes"
BRIDGE="br0"

重启网络
[root@localhost ~]# systemctl restart network
[root@localhost ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP group default qlen 1000
    link/ether 00:0c:29:20:9e:66 brd ff:ff:ff:ff:ff:ff
3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:0c:29:20:9e:66 brd ff:ff:ff:ff:ff:ff
    inet 192.168.145.149/24 brd 192.168.145.255 scope global noprefixroute br0
       valid_lft forever preferred_lft forever
    inet6 fe80::387d:daff:fe6b:c9c1/64 scope link 
       valid_lft forever preferred_lft forever

启动服务并设置开机自启
[root@localhost ~]# systemctl start libvirtd
[root@localhost ~]# systemctl enable libvirtd
[root@localhost ~]# systemctl status libvirtd
● libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
   Active: active (running) since 三 2021-10-20 12:16:29 EDT; 9s ago
     Docs: man:libvirtd(8)
           https://libvirt.org
 Main PID: 20714 (libvirtd)
   CGroup: /system.slice/libvirtd.service
           ├─20714 /usr/sbin/libvirtd
           ├─20825 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default....
           └─20826 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default....

10月 20 12:16:29 localhost.localdomain dnsmasq[20825]: started, version 2.76 cach...
10月 20 12:16:29 localhost.localdomain dnsmasq[20825]: compile time options: IPv6...
10月 20 12:16:29 localhost.localdomain dnsmasq-dhcp[20825]: DHCP, IP range 192.16...
10月 20 12:16:29 localhost.localdomain dnsmasq-dhcp[20825]: DHCP, sockets bound e...
10月 20 12:16:29 localhost.localdomain dnsmasq[20825]: reading /etc/resolv.conf
10月 20 12:16:29 localhost.localdomain dnsmasq[20825]: using nameserver 192.168.1...
10月 20 12:16:29 localhost.localdomain dnsmasq[20825]: using nameserver 114.114.1...
10月 20 12:16:29 localhost.localdomain dnsmasq[20825]: read /etc/hosts - 2 addresses
10月 20 12:16:29 localhost.localdomain dnsmasq[20825]: read /var/lib/libvirt/dnsm...
10月 20 12:16:29 localhost.localdomain dnsmasq-dhcp[20825]: read /var/lib/libvirt...
Hint: Some lines were ellipsized, use -l to show in full

验证
[root@localhost ~]# lsmod|grep kvm
kvm_intel             174841  0 
kvm                   578518  1 kvm_intel
irqbypass              13503  1 kvm

测试验证安装结果
[root@localhost ~]# virsh -c qemu:///system list
 Id    名称                         状态
----------------------------------------------------

[root@localhost ~]# virsh --version
4.5.0
[root@localhost ~]# virt-install --version
1.5.0
[root@localhost ~]# ln -s /usr/libexec/qemu-kvm /usr/bin/qemu-kvm
[root@localhost ~]# ll /usr/bin/qemu-kvm
lrwxrwxrwx 1 root root 21 10月 20 12:18 /usr/bin/qemu-kvm -> /usr/libexec/qemu-kvm
[root@localhost ~]# lsmod |grep kvm
kvm_intel             174841  0 
kvm                   578518  1 kvm_intel
irqbypass              13503  1 kvm

查看网桥
[root@localhost ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.000c29209e66       no              ens33
virbr0          8000.525400b57dfe       yes             virbr0-nic

KVM web界面安装

安装依赖包
[root@localhost ~]# yum -y install git python-pip libvirt-python libxml2-python python-we

安装webvirtmgr
拉取
[root@localhost ~]# cd /usr/local/src/
[root@localhost src]# git clone git://github.com/retspen/webvirtmgr.git
正克隆到 'webvirtmgr'...
remote: Enumerating objects: 5614, done.
remote: Total 5614 (delta 0), reused 0 (delta 0), pack-reused 5614
接收对象中: 100% (5614/5614), 2.97 MiB | 87.00 KiB/s, done.
处理 delta 中: 100% (3606/3606), done.
安装
[root@localhost src]# cd webvirtmgr/
[root@localhost webvirtmgr]# pip2 install -r requirements.txt
Collecting django==1.5.5 (from -r requirements.txt (line 1))
  Downloading https://files.pythonhosted.org/packages/38/49/93511c5d3367b6b21fc2995a0e53399721afc15e4cd6eb57be879ae13ad4/Django-1.5.5.tar.gz (8.1MB)
    100% |████████████████████████████████| 8.1MB 114kB/s 
Collecting gunicorn==19.5.0 (from -r requirements.txt (line 2))
  Downloading https://files.pythonhosted.org/packages/f9/4e/f4076a1a57fc1e75edc0828db365cfa9005f9f6b4a51b489ae39a91eb4be/gunicorn-19.5.0-py2.py3-none-any.whl (113kB)
    100% |████████████████████████████████| 122kB 3.8MB/s 
Collecting lockfile>=0.9 (from -r requirements.txt (line 5))
  Downloading https://files.pythonhosted.org/packages/c8/22/9460e311f340cb62d26a38c419b1381b8593b0bb6b5d1f056938b086d362/lockfile-0.12.2-py2.py3-none-any.whl
Installing collected packages: django, gunicorn, lockfile
  Found existing installation: Django 1.11.27
    Uninstalling Django-1.11.27:
      Successfully uninstalled Django-1.11.27
  Running setup.py install for django ... done
Successfully installed django-1.5.5 gunicorn-19.5.0 lockfile-0.12.2
You are using pip version 8.1.2, however version 21.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

检查sqlite3是否安装
[root@localhost ~]# python
Python 2.7.5 (default, Nov 16 2020, 22:23:17) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-44)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> exit
Use exit() or Ctrl-D (i.e. EOF) to exit
>>> exit()

[root@localhost ~]# cd /usr/local/src/webvirtmgr/
[root@localhost webvirtmgr]# python manage.py syncdb
WARNING:root:No local_settings file found.
Creating tables ...
Creating table auth_permission
Creating table auth_group_permissions
Creating table auth_group
Creating table auth_user_groups
Creating table auth_user_user_permissions
Creating table auth_user
Creating table django_content_type
Creating table django_session
Creating table django_site
Creating table servers_compute
Creating table instance_instance
Creating table create_flavor

You just installed Django's auth system, which means you don't have any superusers defined.
Would you like to create one now? (yes/no): yes
Username (leave blank to use 'root'): root
Email address: 1642453107@qq.com
Password: 
Password (again): 
Superuser created successfully.
Installing custom SQL ...
Installing indexes ...
Installed 6 object(s) from 1 fixture(s)

创建用户
[root@localhost ~]# useradd  nginx
[root@localhost webvirtmgr]# cp -r /usr/local/src/webvirtmgr /var/www/
[root@localhost webvirtmgr]# chown -R nginx.nginx /var/www/webvirtmgr/

[root@localhost ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:IoSeB6UcXBTiYTlUOCjORkc/HZ+luwS8t5jXadtfoyE root@localhost.localdomain
The key's randomart image is:
+---[RSA 2048]----+
| +BB*. .   .     |
|o=*O. o o +      |
|= Bo.o + +       |
| = +  . o .      |
|. o o ..S+       |
|   . . .= + .    |
|       o + E . ..|
|        . . + o o|
|           . o.. |
+----[SHA256]-----+
[root@localhost ~]# ssh-copy-id 192.168.145.149
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host '192.168.145.149 (192.168.145.149)' can't be established.
ECDSA key fingerprint is SHA256:M0xtpozXpCsgJ3Fwqlvqqx7bmIF8wXeYP6MbJxx6ftQ.
ECDSA key fingerprint is MD5:32:fd:62:4d:03:16:2a:38:22:ce:86:ed:68:45:ee:2c.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@192.168.145.149's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh '192.168.145.149'"
and check to make sure that only the key(s) you wanted were added.

配置端口转发
[root@localhost ~]# ssh 192.168.145.149 -L localhost:8000:localhost:8000 -L localhost:6080:localhost:60
Last login: Wed Oct 20 11:59:26 2021 from 192.168.145.1
[root@localhost ~]# ss -antl
State       Recv-Q Send-Q Local Address:Port               Peer Address:Port              
LISTEN      0      5      127.0.0.1:25151                      *:*                  
LISTEN      0      128    127.0.0.1:6080                       *:*                  
LISTEN      0      128    127.0.0.1:8000                       *:*                  
LISTEN      0      5              *:873                        *:*                  
LISTEN      0      5      192.168.122.1:53                         *:*                  
LISTEN      0      128            *:22                         *:*                  
LISTEN      0      100    127.0.0.1:25                         *:*                  
LISTEN      0      128          ::1:6080                      :::*                  
LISTEN      0      128          ::1:8000                      :::*                  
LISTEN      0      5             :::873                       :::*                  
LISTEN      0      128           :::80                        :::*                  
LISTEN      0      128           :::22                        :::*                  
LISTEN      0      100          ::1:25                        :::*                  
LISTEN      0      128           :::443                       :::*           

安装nginx
[root@localhost ~]# yum -y install nginx
[root@localhost nginx]# vim nginx.conf
    server {
        listen       80;
        server_name  localhost;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        error_page 404 /404.html;
        location = /404.html {
        }

        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
        }
    }


[root@localhost nginx]# cd conf.d/
[root@localhost conf.d]# cat webvirtmgr.conf 
server {
    listen 80 default_server;

    server_name $hostname;
    #access_log /var/log/nginx/webvirtmgr_access_log;

    location /static/ {
        root /var/www/webvirtmgr/webvirtmgr;
        expires max;
    }

    location / {
        proxy_pass http://127.0.0.1:8000;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-for $proxy_add_x_forwarded_for;
        proxy_set_header Host $host:$server_port;
        proxy_set_header X-Forwarded-Proto $remote_addr;
        proxy_connect_timeout 600;
        proxy_read_timeout 600;
        proxy_send_timeout 600;
        client_max_body_size 1024M;
    }
}

[root@localhost ~]# vim /var/www/webvirtmgr/conf/gunicorn.conf.py
bind = '0.0.0.0:8000'
backlog = 2048

重启nginx
[root@localhost ~]# systemctl restart nginx
[root@localhost ~]# ss -anlt
State       Recv-Q Send-Q                                                    Local Address:Port                                                                   Peer Address:Port              
LISTEN      0      128                                                           127.0.0.1:6080                                                                              *:*                  
LISTEN      0      128                                                           127.0.0.1:8000                                                                              *:*                  
LISTEN      0      128                                                                   *:80                                                                                *:*                  
LISTEN      0      5                                                         192.168.122.1:53                                                                                *:*                  
LISTEN      0      128                                                                   *:22                                                                                *:*                  
LISTEN      0      100                                                           127.0.0.1:25                                                                                *:*                  
LISTEN      0      128                                                                 ::1:6080                                                                             :::*                  
LISTEN      0      128                                                                 ::1:8000                                                                             :::*                  
LISTEN      0      128                                                                  :::22                                                                               :::*                  
LISTEN      0      100                                                                 ::1:25

设置supervisor
[root@localhost ~]# yum -y install supervisor
[root@localhost ~]# vim /etc/supervisord.conf
[program:webvirtmgr]
command=/usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /var/www/webvirtmgr/conf/gunicorn.conf.py
directory=/var/www/webvirtmgr
autostart=true
autorestart=true
logfile=/var/log/supervisor/webvirtmgr.log
log_stderr=true
user=nginx

[program:webvirtmgr-console]
command=/usr/bin/python2 /var/www/webvirtmgr/console/webvirtmgr-console
directory=/var/www/webvirtmgr
autostart=true
autorestart=true
stdout_logfile=/var/log/supervisor/webvirtmgr-console.log
redirect_stderr=true
user=nginx

启动supervisor并设置开机自启 
[root@localhost ~]# systemctl start supervisord
[root@localhost ~]# systemctl enable supervisord
Created symlink from /etc/systemd/system/multi-user.target.wants/supervisord.service to /usr/lib/systemd/system/supervisord.service.
[root@localhost ~]# systemctl status supervisord
● supervisord.service - Process Monitoring and Control Daemon
   Loaded: loaded (/usr/lib/systemd/system/supervisord.service; enabled; vendor preset: disabled)
   Active: active (running) since 三 2021-10-20 14:07:13 EDT; 27s ago
 Main PID: 9379 (supervisord)
   CGroup: /system.slice/supervisord.service
           ├─9379 /usr/bin/python /usr/bin/supervisord -c /etc/supervisord.conf
           ├─9407 /usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /...
           ├─9413 /usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /...
           ├─9414 /usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /...
           ├─9415 /usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /...
           ├─9416 /usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /...
           ├─9417 /usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /...
           ├─9418 /usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /...
           ├─9433 /usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /...
           ├─9434 /usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /...
           └─9435 /usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /...

10月 20 14:07:13 localhost.localdomain systemd[1]: Starting Process Monitoring a....
10月 20 14:07:13 localhost.localdomain systemd[1]: Started Process Monitoring an....
Hint: Some lines were ellipsized, use -l to show in full.
[root@localhost ~]# ss -antl
State       Recv-Q Send-Q Local Address:Port               Peer Address:Port              
LISTEN      0      128    127.0.0.1:6080                       *:*                  
LISTEN      0      128    127.0.0.1:8000                       *:*                  
LISTEN      0      128            *:80                         *:*                  
LISTEN      0      5      192.168.122.1:53                         *:*                  
LISTEN      0      128            *:22                         *:*                  
LISTEN      0      100    127.0.0.1:25                         *:*                  
LISTEN      0      128          ::1:6080                      :::*                  
LISTEN      0      128          ::1:8000                      :::*                  
LISTEN      0      128           :::22                        :::*                  
LISTEN      0      100          ::1:25                        :::*                    

配置nginx用户
[root@localhost ~]# su - nginx -s /bin/bash
[nginx@localhost ~]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/nginx/.ssh/id_rsa): 
Created directory '/home/nginx/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/nginx/.ssh/id_rsa.
Your public key has been saved in /home/nginx/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:XxALcN/JGzD4p0gGtt8wBtcSePxK0Ug+kdeDaPZAm1k nginx@localhost.localdomain
The key's randomart image is:
+---[RSA 2048]----+
|      .*BOEo     |
|      =o#O=Bo.   |
|     . O*O+ =.   |
|      . B.+..o   |
|       *S* oo    |
|        +.o.     |
|          .      |
|                 |
|                 |
+----[SHA256]-----+
[nginx@localhost ~]$ touch ~/.ssh/config && echo -e "StrictHostKeyChecking=no\nUserKnownHostsFile=/dev/null" >> ~/.ssh/config
[nginx@localhost ~]$ chmod 0600 ~/.ssh/config
[nginx@localhost ~]$ ssh-copy-id root@192.168.145.149
/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/nginx/.ssh/id_rsa.pub"
/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
Warning: Permanently added '192.168.145.149' (ECDSA) to the list of known hosts.
root@192.168.145.149's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'root@192.168.145.149'"
and check to make sure that only the key(s) you wanted were added.

[nginx@localhost ~]$ exit
logout

[root@localhost ~]# vim /etc/polkit-1/localauthority/50-local.d/50-libvirt-remote-access.pkla
[root@localhost ~]# cat /etc/polkit-1/localauthority/50-local.d/50-libvirt-remote-access.pkla
[Remote libvirt SSH access]
Identity=unix-user:root
Action=org.libvirt.unix.manage
ResultAny=yes
ResultInactive=yes
ResultActive=yes
[root@localhost ~]# systemctl restart nginx
[root@localhost ~]# systemctl restart libvirtd

 

 

 

 

 

 

 

 

[root@localhost ~]# cd /var/lib/libvirt/images/
[root@localhost images]# ls
[root@localhost images]# ls
CentOS-8.4.2105-x86_64-dvd1.iso


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

标签:虚拟机,KVM,nginx,usr,root,webvirtmgr,localhost,LISTEN
来源: https://www.cnblogs.com/Aimmi/p/15431642.html