kvm虚拟化部署
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kvm虚拟化部署
文章目录
KVM虚拟化有两个核心模块：
**1）KVM内核模块：**主要包括KVM虚拟化核心模块KVM.ko，以及硬件相关的KVM_intel或KVM_AMD模块；负责CPU与内存虚拟化，包括VM创建，内存分配与管理、vCPU执行模式切换等。
**2）QEMU设备模拟：**实现IO虚拟化与各设备模拟（磁盘、网卡、显卡、声卡等），通过IOCTL系统调用与KVM内核交互。KVM仅支持基于硬件辅助的虚拟化（如Intel-VT与AMD-V），在内核加载时，KVM先初始化内部数据结构，打开CPU控制寄存器CR4里面的虚拟化模式开关，执行VMXON指令将Host OS设置为root模式，并创建的特殊设备文件/dev/kvm等待来自用户空间的命令，然后由KVM内核与QEMU相互配合实现VM的管理。KVM会复用部分Linux内核的能力，如进程管理调度、设备驱动，内存管理等。
物理服务器上通常配置2个物理pCPU（Socket），每个CPU有多个核（core）；开启超线程Hyper-Threading技术后，每个core有2个线程（Thread）；在虚拟化环境中一个Thread对应一个vCPU。在KVM中每一个VM就是一个用户空间的QEMU进程，分配给Guest的vCPU就是该进程派生的一个线程Thread，由Linux内核动态调度到基于时分复用的物理pCPU上运行。KVM支持设置CPU亲和性，将vCPU绑定到特定物理pCPU，如通过libvirt驱动指定从NUMA节点为Guest分配vCPU与内存。KVM支持vCPU超分（over-commit）使得分配给Guest的vCPU数量超过物理CPU线程总量。
开启虚拟化功能
关闭防火墙和selinux
[root@localhost ~]# systemctl disable --now firewalld
[root@localhost ~]# setenforce 0
[root@localhost ~]# vi /etc/selinux/config
SELINUX=disabled
安装工具
[root@localhost ~]# yum -y install epel-release vim wget net-tools unzip zip gcc gcc-c++
检查CPU是否支持KVM
[root@localhost ~]# egrep -o 'vmx|svm' /proc/cpuinfo
vmx
vmx
安装kvm
[root@localhost ~]# yum -y install qemu-kvm qemu-kvm-tools qemu-img virt-manager libvirt libvirt-python libvirt-client virt-install virt-viewer bridge-utils libguestfs-tools
使用br0来桥接ens33网卡
[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# vim ifcfg-br0
[root@localhost network-scripts]# cat ifcfg-br0
TYPE=Bridge
DEVICE=br0
NM_CONTROLLED=no
BOOTPROTO=static
NAME=br0
ONBOOT=yes
IPADDR=192.168.0.40
NETMASK=255.255.255.0
GATEWAY=192.168.0.2
DNS1=114.114.114.114
DNS2=8.8.8.8
[root@localhost network-scripts]# cat ifcfg-ens33
TYPE=Ethernet
BOOTPROTO=static
NAME=ens33
DEVICE=ens33
ONBOOT=yes
BRIDGE=br0
NM_CONTROLLED=no
重启网卡
[root@localhost ~]# systemctl restart network
启动服务
[root@localhost network-scripts]# systemctl enable --now libvirtd
[root@localhost network-scripts]# systemctl status libvirtd
● libvirtd.service - Virtualization daemon
Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2021-06-20 20:53:17 CST; 38min ago
Docs: man:libvirtd(8)
https://libvirt.org
Main PID: 2181 (libvirtd)
Tasks: 19 (limit: 32768)
CGroup: /system.slice/libvirtd.service
├─1364 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-r...
├─1367 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-r...
└─2181 /usr/sbin/libvirtd
Jun 20 21:01:19 localhost.localdomain dnsmasq[1364]: reading /etc/resolv.conf
Jun 20 21:01:19 localhost.localdomain dnsmasq[1364]: using nameserver 114.114.114.114#53
Jun 20 21:01:19 localhost.localdomain dnsmasq[1364]: using nameserver 8.8.8.8#53
Jun 20 21:01:24 localhost.localdomain dnsmasq[1364]: reading /etc/resolv.conf
Jun 20 21:01:24 localhost.localdomain dnsmasq[1364]: using nameserver 114.114.114.114#53
Jun 20 21:01:24 localhost.localdomain dnsmasq[1364]: using nameserver 8.8.8.8#53
Jun 20 21:25:28 localhost.localdomain dnsmasq[1364]: reading /etc/resolv.conf
Jun 20 21:25:28 localhost.localdomain dnsmasq[1364]: using nameserver 192.168.0.1#53
Jun 20 21:25:30 localhost.localdomain dnsmasq[1364]: reading /etc/resolv.conf
Jun 20 21:25:30 localhost.localdomain dnsmasq[1364]: using nameserver 192.168.0.1#53
验证
[root@localhost network-scripts]# lsmod|grep kvm
kvm_intel 188740 0
kvm 637289 1 kvm_intel
irqbypass 13503 1 kvm
[root@localhost network-scripts]# ln -s /usr/libexec/qemu-kvm /usr/bin/qemu-kvm
kvm web 页面安装
安装依赖包
[root@localhost ~]# yum -y install git python-pip libvirt-python libxml2-python python-websockify supervisor nginx python-devel
从github上下载webvirtmgr代码
[root@localhost ~]# git clone git://github.com/retspen/webvirtmgr.git
Cloning into 'webvirtmgr'...
remote: Enumerating objects: 5614, done.
remote: Total 5614 (delta 0), reused 0 (delta 0), pack-reused 5614
Receiving objects: 100% (5614/5614), 2.97 MiB | 28.00 KiB/s, done.
Resolving deltas: 100% (3606/3606), done.
[root@localhost ~]# ls
anaconda-ks.cfg webvirtmgr
安装webvirtmgr
[root@localhost ~]# cd webvirtmgr/
[root@localhost webvirtmgr]# cat requirements.txt
django==1.5.5
gunicorn==19.5.0
# Utility Requirements
# for SECURE_KEY generation
lockfile>=0.9
# Uncoment for support ldap
#django-auth-ldap==1.2.0
[root@localhost webvirtmgr]# pip install -r requirements.txt
初始化账号信息
[root@localhost webvirtmgr]# python manage.py syncdb
移动网站目录并设置属组和属主
[root@localhost webvirtmgr]# mkdir -p /var/www
[root@localhost webvirtmgr]# cp -r /root/webvirtmgr/ /var/www/
[root@localhost webvirtmgr]# chown -R nginx.nginx /var/www/webvirtmgr/
做免密登录
[root@localhost webvirtmgr]# 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:N+sdmfjKqtQTxdftfwCOe6gzOLEbHC+3BfHPg8Ff5sbUU root@localhost.localdomain
The key's randomart image is:
+---[RSA 2048]----+
| |
| |
|. . E |
|.+ . ... . |
|+.* ..o.So+ . |
|.*.. ++Booo.. . |
|.ooo. =*= o+ o |
| oB+o+. .o. . |
|. +B=+ |
+----[SHA256]-----+
[root@localhost webvirtmgr]# ssh-copy-id 192.168.207.140
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host '192.168.247.50 (192.168.247.140)' can't be established.
ECDSA key fingerprint is SHA256:w6Kbwkn18/Aj5eoWDcNRGLWpWsdEa6r4gYvyX8ZBKeQ.
ECDSA key fingerprint is MD5:e8:7f:6c:96:23:f1:e8:e3:4e:cd:1e:7f:50:d7:a9:38.
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@192.168.207.140's password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh '192.168.247.50'"
and check to make sure that only the key(s) you wanted were added.
[root@localhost webvirtmgr]# ssh 192.168.207.140
Last login: Sat Jun 19 03:08:24 2021 from 192.168.207.2
[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:d7:8d:e3 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:d7:8d:e3 brd ff:ff:ff:ff:ff:ff
inet 192.168.207.140/24 brd 192.168.207.255 scope global br0
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fed7:8de3/64 scope link
valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:f7:62:63 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
link/ether 52:54:00:f7:62:63 brd ff:ff:ff:ff:ff:ff
[root@localhost ~]# exit
logout
Connection to 192.168.207.140 closed.
配置nginx
[root@localhost webvirtmgr]# cd /etc/nginx/
[root@localhost nginx]# mv nginx.conf nginx.conf-bak
[root@localhost nginx]# vim /etc/nginx/nginx.conf
[root@localhost nginx]# cat /etc/nginx/nginx.conf
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
include /usr/share/nginx/modules/*.conf;
events {
worker_connections 1024;
}
http {
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
include /etc/nginx/conf.d/*.conf;
server {
listen 80;
server_name localhost;
include /etc/nginx/default.d/*.conf;
location / {
root html;
index index.html index.htm;
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
}
[root@localhost nginx]# vim /etc/nginx/conf.d/webvirtmgr.conf
[root@localhost nginx]# cat /etc/nginx/conf.d/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 $remote_addr;
proxy_connect_timeout 600;
proxy_read_timeout 600;
proxy_send_timeout 600;
client_max_body_size 1024M;
}
}
修改绑定端口
[root@localhost nginx]# vim /var/www/webvirtmgr/conf/gunicorn.conf.py
bind = '0.0.0.0:8000'
backlog = 2048
对supervisord.conf文件进行修改
[root@localhost nginx]# cat >> /etc/supervisord.conf <<EOF
> [program:webvirtmgr]
> command=/usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /var/www/webvirtmgr/conf/gunicorn.conf.py
> directory=/var/www/webvirtmgr
> autostart=true
> autorestart=true
> logfile=/var/log/supervisor/webvirtmgr.log
> log_stderr=true
> user=nginx
>
> [program:webvirtmgr-console]
> command=/usr/bin/python2 /var/www/webvirtmgr/console/webvirtmgr-console
> directory=/var/www/webvirtmgr
> autostart=true
> autorestart=true
> stdout_logfile=/var/log/supervisor/webvirtmgr-console.log
> redirect_stderr=true
> user=nginx
> EOF
启动supervisord
[root@localhost nginx]# systemctl enable --now supervisord
[root@localhost nginx]# systemctl restart nginx
[root@localhost nginx]# ss -anlt
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 *:8000 *:*
LISTEN 0 100 *:6080 *:*
LISTEN 0 128 *:111 *:*
LISTEN 0 128 *:80 *:*
LISTEN 0 5 192.168.122.1:53 *:*
LISTEN 0 128 *:22 *:*
LISTEN 0 100 127.0.0.1:25 *:*
LISTEN 0 128 127.0.0.1:6010 *:*
LISTEN 0 128 [::]:111 [::]:*
LISTEN 0 128 [::]:22 [::]:*
LISTEN 0 100 [::1]:25 [::]:*
LISTEN 0 128 [::1]:6010 [::]:*
配置nginx
[root@localhost nginx]# su - nginx -s /bin/bash
-bash-4.2$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/var/lib/nginx/.ssh/id_rsa):
Created directory '/var/lib/nginx/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /var/lib/nginx/.ssh/id_rsa.
Your public key has been saved in /var/lib/nginx/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:effZyqsdMBdsKY5sdIIHysQVAasvRcAtBnI2Ln3FkONUg nginx@localhost.localdomain
The key's randomart image is:
+---[RSA 2048]----+
|=*=++Eoo |
|+.==*= .. |
|oo=*+.* . |
|. + B + + . o |
| + o S * o o .|
| . o o = . . |
| . + |
| o . |
| . |
+----[SHA256]-----+
-bash-4.2$ ssh-copy-id root@192.168.207.140
/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/var/lib/nginx/.ssh/id_rsa.pub"
The authenticity of host '192.168.207.140 (192.168.207.140)' can't be established.
ECDSA key fingerprint is SHA256:w6Kbwkn18/Aj5eoWDcNRGLWpWsdEa6r4gYvyX8ZBKeQ.
ECDSA key fingerprint is MD5:e8:7f:6c:96:23:f1:e8:e3:4e:cd:1e:7f:50:d7:a9:38.
Are you sure you want to continue connecting (yes/no)? yes
/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
root@192.168.247.50's password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh 'root@192.168.207.140'"
and check to make sure that only the key(s) you wanted were added.
-bash-4.2$ exit
logout
[root@localhost nginx]# vim /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 nginx]# systemctl restart nginx
[root@localhost ~]# systemctl restart libvirtd
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