KVM虛擬化 虛擬化介紹 虛擬化：在一臺電腦上虛擬出多個邏輯的電腦，而且每個邏輯電腦 它可以是不同操作系統 虛擬化技術：可以擴大硬體容量，單個cpu模擬出多個cpu並行， 允許一個平臺上同時運行多個操作系統，應用程式都可以在相互獨立 的空間內運行，而且互不影響。 為什麼企業使用虛擬化技術 1、 ...
KVM虛擬化
目錄
虛擬化介紹
虛擬化：在一臺電腦上虛擬出多個邏輯的電腦，而且每個邏輯電腦
它可以是不同操作系統
虛擬化技術：可以擴大硬體容量，單個cpu模擬出多個cpu並行，
允許一個平臺上同時運行多個操作系統，應用程式都可以在相互獨立
的空間內運行，而且互不影響。
為什麼企業使用虛擬化技術
1、節約成本
2、提高效率,物理機我們一般稱為宿主機（Host），宿主機上面的虛擬機稱為客戶機（Guest）。
那麼 Host 是如何將自己的硬體資源虛擬化，並提供給 Guest 使用的呢？
這個主要是通過一個叫做 Hypervisor 的程式實現的。
Hypervisor：一種運行在物理伺服器硬體與操作系統之間的中間軟體層
可允許多個操作系統和應用來共用硬體資源
根據 Hypervisor 的實現方式和所處的位置，虛擬化又分為兩種：
完全虛擬化:直接在物理機上部署虛擬化，且不需要修改操作系統內核
半虛擬化:需要修改操作系統內核，使其支持虛擬化驅動來實現虛擬化技術
1、完全虛擬化
Hypervisor 直接安裝在物理機上，多個虛擬機在 Hypervisor 上運行。Hypervisor 實現方式一般是一個特殊定製的 Linux 系統。Xen 和 VMWare 的 ESXi 都屬於這個類型
2、半虛擬化
理論上講：
完全虛擬化一般對硬體虛擬化功能進行了特別優化，性能上比半虛擬化要高；
半虛擬化因為基於普通的操作系統，會比較靈活，比如支持虛擬機嵌套。嵌套意味著可以在KVM虛擬機中再運行KVM。
kvm介紹
kVM 全稱是 Kernel-Based Virtual Machine。也就是說 KVM 是基於 Linux 內核實現的。
KVM有一個內核模塊叫 kvm.ko，只用於管理虛擬 CPU 和記憶體。
那 IO 的虛擬化，比如存儲和網路設備則是由 Linux 內核與Qemu來實現。
Qemu 是純軟體實現的虛擬化模擬器，幾乎可以模擬任何硬體設備，我們最熟悉的就是能夠模擬一臺能夠獨立運行操作系統的虛擬機，虛擬機認為自己和硬體打交道，但其實是和 Qemu 模擬出來的硬體打交道，Qemu 將這些指令轉譯給真正的硬體。
正因為 Qemu 是純軟體實現的，所有的指令都要經 Qemu 過一手，性能非常低，所以，在生產環境中，大多數的做法都是配合 KVM 來完成虛擬化工作，因為 KVM 是硬體輔助的虛擬化技術，主要負責 比較繁瑣的 CPU 和記憶體虛擬化，而 Qemu 則負責 I/O 虛擬化，兩者合作各自發揮自身的優勢，相得益彰.
作為一個 Hypervisor，KVM 本身只關註虛擬機調度和記憶體管理這兩個方面。IO 外設的任務交給 Linux 內核和 Qemu。
Libvirt 就是 KVM 的管理工具。管理虛擬機和虛擬化功能的軟體
其實，Libvirt 除了能管理 KVM 這種 Hypervisor，還能管理 Xen，VirtualBox 等。
Libvirt 包含 3 個東西：後臺 daemon 程式 libvirtd、API 庫和命令行工具 virsh
1、libvirtd是服務程式，接收和處理 API 請求；
2、API 庫使得其他人可以開發基於 Libvirt 的高級工具，比如 virt-manager，這是個圖形化的 KVM 管理工具；
3、virsh 是我們經常要用的 KVM 命令行工具
KVM部署（基於CentOS7）
虛擬機的安裝步驟可以查看我之前centos8.5的安裝，變化倒是不大修改一下對應參數就可以了
環境說明：
系統：CentOS7
ip :192.168.222.140
- CPU虛擬化功能
部署前請確保你的CPU虛擬化功能已開啟，分為兩種情況：
（1）虛擬機要關機設置CPU虛擬化
（2）物理機要在BIOS里開啟CPU虛擬化 - 虛擬機設置（記憶體：8G 磁碟：80G(自定義可以大一點) 虛擬化功能：開啟）
//設置虛擬機記憶體，添加一塊80G的硬碟
開啟虛擬化
新建分區，將硬碟所有大小都給這個分區
[root@localhost ~]# lsblk //查看一下分區
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 10G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 9G 0 part
├─centos-root 253:0 0 8G 0 lvm /
└─centos-swap 253:1 0 1G 0 lvm [SWAP]
sdb 8:16 0 80G 0 disk
sr0 11:0 1 4.2G 0 rom
[root@localhost ~]# parted /dev/sdb
GNU Parted 3.1
使用 /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) //Tab兩下查看
align-check help mktable quit select unit
disk_set mklabel name rescue set version
disk_toggle mkpart print rm toggle
(parted) mklabel
新的磁碟標簽類型？ //Tab兩下查看
aix amiga bsd dvh gpt loop mac msdos pc98 sun
新的磁碟標簽類型？ msdos
(parted) //Tab兩下查看
align-check help mktable quit select unit
disk_set mklabel name rescue set version
disk_toggle mkpart print rm toggle
(parted) unit
Unit? [compact]? //Tab兩下查看
% chs cyl GiB kiB MiB TB
B compact GB kB MB s TiB
Unit? [compact]? MiB
(parted) p
Model: VMware, VMware Virtual S (scsi)
Disk /dev/sdb: 81920MiB //創建磁碟的大小
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system 標誌
(parted) //Tab兩下查看
align-check help mktable quit select unit
disk_set mklabel name rescue set version
disk_toggle mkpart print rm toggle
(parted) mkpart
分區類型？ primary/主分區/extended/擴展分區? primary
文件系統類型？ [ext2]? //Tab兩下查看
affs0 amufs apfs2 hfs linux-swap(v0)
affs1 amufs0 asfs hfs+ linux-swap(v1)
affs2 amufs1 btrfs hfsx nilfs2
affs3 amufs2 ext2 hp-ufs ntfs
affs4 amufs3 ext3 jfs reiserfs
affs5 amufs4 ext4 linux-swap sun-ufs
affs6 amufs5 fat16 linux-swap(new) swsusp
affs7 apfs1 fat32 linux-swap(old) xfs
文件系統類型？ [ext2]? xfs
起始點？ 10MiB
結束點？ 81910MiB //比剛剛創建的小10MiB就可以了
(parted) p
Model: VMware, VMware Virtual S (scsi)
Disk /dev/sdb: 81920MiB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system 標誌
1 10.0MiB 81910MiB 81900MiB primary
(parted) q
信息: You may need to update /etc/fstab.
[root@localhost ~]# udevadm settle
格式化
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 10G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 9G 0 part
├─centos-root 253:0 0 8G 0 lvm /
└─centos-swap 253:1 0 1G 0 lvm [SWAP]
sdb 8:16 0 80G 0 disk
└─sdb1 8:17 0 80G 0 part
sr0 11:0 1 4.2G 0 rom
[root@localhost ~]# mkfs.xfs /dev/sdb1
meta-data=/dev/sdb1 isize=512 agcount=4, agsize=5241600 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=20966400, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=10237, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@localhost ~]# blkid /dev/sdb1
/dev/sdb1: UUID="09888ad8-a1ef-42fb-9c36-937e071bf897" TYPE="xfs"
創建掛載點,併進行永久掛載
[root@localhost ~]# yum -y install vim
[root@localhost ~]# mkdir /kvmdata
[root@localhost ~]# vim /etc/fstab
UUID="09888ad8-a1ef-42fb-9c36-937e071bf897" /kvmdata xfs defaults 0 0 //添加這一行
[root@localhost ~]# mount -a
[root@localhost ~]# df -Th
文件系統 類型 容量 已用 可用 已用% 掛載點
/dev/mapper/centos-root xfs 8.0G 1.2G 6.9G 15% /
devtmpfs devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs tmpfs 3.9G 8.7M 3.9G 1% /run
tmpfs tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 143M 872M 15% /boot
tmpfs tmpfs 781M 0 781M 0% /run/user/0
/dev/sdb1 xfs 80G 33M 80G 1% /kvmdata
KVM安裝
關閉防火牆和selinux
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# vim /etc/selinux/config
SELINUX=disabled
[root@localhost ~]# setenforce 0
[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 ~]# reboot
部署yum源
可以配置阿裡雲的網路源
阿裡雲官網
[root@localhost ~]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# ls
CentOS-Base.repo CentOS-Debuginfo.repo CentOS-Media.repo CentOS-Vault.repo epel-testing.repo
CentOS-CR.repo CentOS-fasttrack.repo CentOS-Sources.repo epel.repo
[root@localhost yum.repos.d]# rm -rf *
[root@localhost yum.repos.d]# ls
[root@localhost yum.repos.d]# curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 2523 100 2523 0 0 9299 0 --:--:-- --:--:-- --:--:-- 9309
[root@localhost yum.repos.d]# sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
[root@localhost yum.repos.d]# ls
CentOS-Base.repo
安裝所需軟體包
[root@localhost yum.repos.d]# cd
[root@localhost ~]# yum -y install epel-release wget net-tools unzip zip gcc gcc-c++
驗證cpu是否支持kvm，vmx是intel的 svm是AMD的
[root@localhost ~]# egrep -o 'vmx|svm' /proc/cpuinfo
vmx
安裝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
配置網路，因為虛擬機中的網路，我們一般是都和公司伺服器處在同一網段的，所以我們需要把kvm的網卡配置成橋接模式
[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# ls
ifcfg-ens33 ifdown-ipv6 ifdown-TeamPort ifup-ippp ifup-routes network-functions
ifcfg-lo ifdown-isdn ifdown-tunnel ifup-ipv6 ifup-sit network-functions-ipv6
ifdown ifdown-post ifup ifup-isdn ifup-Team
ifdown-bnep ifdown-ppp ifup-aliases ifup-plip ifup-TeamPort
ifdown-eth ifdown-routes ifup-bnep ifup-plusb ifup-tunnel
ifdown-ib ifdown-sit ifup-eth ifup-post ifup-wireless
ifdown-ippp ifdown-Team ifup-ib ifup-ppp init.ipv6-global
[root@localhost network-scripts]# cp ifcfg-ens33 ifcfg-br0
[root@localhost network-scripts]# vim ifcfg-br0
[root@localhost network-scripts]# cat ifcfg-br0
TYPE=bridge
BOOTPROTO=none
NAME=br0
DEVICE=br0
ONBOOT=yes
IPADDR=192.168.222.140
PREFIX=24
GATEWAY=192.168.222.2
DNS1=192.168.222.2
[root@localhost network-scripts]# vim ifcfg-ens33
[root@localhost network-scripts]# cat ifcfg-ens33
TYPE=Ethernet
BOOTPROTO=none
NAME=ens33
DEVICE=ens33
ONBOOT=yes
BRIDGE=br0
[root@localhost network-scripts]# systemctl restart NetworkManager
[root@localhost network-scripts]# ifdown ens33;ifup ens33
成功斷開設備 'ens33'。
連接已成功激活（D-Bus 活動路徑：/org/freedesktop/NetworkManager/ActiveConnection/3）
[root@localhost network-scripts]# cd
[root@localhost ~]# ifconfig
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.222.140 netmask 255.255.255.0 broadcast 192.168.222.255
inet6 fe80::1c12:5bff:fea2:ba71 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:5a:f0:0d txqueuelen 1000 (Ethernet)
RX packets 494 bytes 34964 (34.1 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 813 bytes 143186 (139.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether 00:0c:29:5a:f0:0d txqueuelen 1000 (Ethernet)
RX packets 201496 bytes 194698973 (185.6 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 108153 bytes 10993998 (10.4 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
重啟libvirtd服務，並設置開機自啟
[root@localhost ~]# systemctl enable --now 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 2022-10-05 02:57:06 CST; 10s ago
Docs: man:libvirtd(8)
https://libvirt.org
Main PID: 106910 (libvirtd)
Tasks: 19 (limit: 32768)
CGroup: /system.slice/libvirtd.service
├─106910 /usr/sbin/libvirtd
├─107058 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefil...
└─107060 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefil...
10月 05 02:57:07 localhost.example.com dnsmasq[107052]: listening on virbr0(#4): 192.168.122.1
10月 05 02:57:07 localhost.example.com dnsmasq[107058]: started, version 2.76 cachesize 150
10月 05 02:57:07 localhost.example.com dnsmasq[107058]: compile time options: IPv6 GNU-getopt D...fy
10月 05 02:57:07 localhost.example.com dnsmasq-dhcp[107058]: DHCP, IP range 192.168.122.2 -- 192...h
10月 05 02:57:07 localhost.example.com dnsmasq-dhcp[107058]: DHCP, sockets bound exclusively to ...0
10月 05 02:57:07 localhost.example.com dnsmasq[107058]: reading /etc/resolv.conf
10月 05 02:57:07 localhost.example.com dnsmasq[107058]: using nameserver 192.168.222.2#53
10月 05 02:57:07 localhost.example.com dnsmasq[107058]: read /etc/hosts - 2 addresses
10月 05 02:57:07 localhost.example.com dnsmasq[107058]: read /var/lib/libvirt/dnsmasq/default.a...es
10月 05 02:57:07 localhost.example.com dnsmasq-dhcp[107058]: read /var/lib/libvirt/dnsmasq/defau...e
Hint: Some lines were ellipsized, use -l to show in full.
查看kvm模塊是否載入
[root@localhost ~]# lsmod |grep kvm
kvm_intel 170086 0
kvm 566340 1 kvm_intel
irqbypass 13503 1 kvm
驗證安裝結果
[root@localhost ~]# virsh -c qemu:///system list
Id 名稱 狀態
----------------------------------------------------
[root@localhost ~]# virsh --version
4.5.0
[root@localhost ~]# virt-install --version
1.5.0
將qemu-kvm這個命令做一個軟鏈接到/usr/bin/qemu-kvm
[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 5 03:01 /usr/bin/qemu-kvm -> /usr/libexec/qemu-kvm
查看網橋信息
[root@localhost ~]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.000c295af00d no ens33
virbr0 8000.525400e562ac yes virbr0-nic
KVM管理界面安裝
Kvm的web界面是由webvirtmgr程式提供的
安裝依賴包
[root@localhost ~]# yum -y install git python-pip libvirt-python libxml2-python python-websockify supervisor nginx python-devel
.....
已安裝:
git.x86_64 0:1.8.3.1-23.el7_8 nginx.x86_64 1:1.20.1-9.el7
python-devel.x86_64 0:2.7.5-92.el7_9 python-websockify.noarch 0:0.6.0-2.el7
python2-pip.noarch 0:8.1.2-14.el7 supervisor.noarch 0:3.4.0-1.el7
作為依賴被安裝:
centos-indexhtml.noarch 0:7-9.el7.centos nginx-filesystem.noarch 1:1.20.1-9.el7
openssl11-libs.x86_64 1:1.1.1k-4.el7 perl-Error.noarch 1:0.17020-2.el7
perl-Git.noarch 0:1.8.3.1-23.el7_8 perl-TermReadKey.x86_64 0:2.30-20.el7
python-meld3.x86_64 0:0.6.10-1.el7 python-rpm-macros.noarch 0:3-34.el7
python-setuptools.noarch 0:0.9.8-7.el7 python-srpm-macros.noarch 0:3-34.el7
python2-rpm-macros.noarch 0:3-34.el7 rsync.x86_64 0:3.1.2-11.el7_9
作為依賴被升級:
python.x86_64 0:2.7.5-92.el7_9 python-libs.x86_64 0:2.7.5-92.el7_9
完畢！
可以提前做一個映射，防止訪問不了github
[root@localhost ~]# vim /etc/hosts
[root@localhost ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
20.205.243.166 github.com //添加
從github上下載webvirtmgr代碼
[root@localhost ~]# cd /usr/local/src/
[root@localhost src]# git clone http://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
接收對象中: 100% (5614/5614), 2.97 MiB | 689.00 KiB/s, done.
處理 delta 中: 100% (3606/3606), done.
安裝webvirtmgr
[root@localhost src]# ls
webvirtmgr
[root@localhost src]# cd webvirtmgr/
[root@localhost webvirtmgr]# pip 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 42kB/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 104kB/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
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 22.2.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
檢查sqlite3是否安裝
[root@localhost ~]# python
Python 2.7.5 (default, Jun 28 2022, 15:30:04)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-44)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sqlite3
>>> exit()
初始化賬號信息
[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 //是否創建超級管理員賬號
Username (leave blank to use 'root'): //指定超級管理員賬號用戶名，預設留空為root
Email address: [email protected] //設置超級管理員郵箱
Password: //設置超級管理員密碼
Password (again): //再次輸入確認超級管理員密碼
Superuser created successfully.
Installing custom SQL ...
Installing indexes ...
Installed 6 object(s) from 1 fixture(s)
拷貝web網頁到指定目錄
root@localhost webvirtmgr]# mkdir /var/www
[root@localhost webvirtmgr]# cp -r /usr/local/src/webvirtmgr/ /var/www/
[root@localhost webvirtmgr]# chown -R nginx.nginx /var/www/webvirtmgr/
生成一對公鑰與私鑰，由於這裡webvirtmgr和kvm服務部署在同一臺主機中，所以這裡本地信任。如果kvm部署在其他機器上的時候，那麼就需要把公鑰發送到kvm主機中
[root@localhost webvirtmgr]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): //直接回車
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): /直接回車
Enter same passphrase again: /直接回車
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:GM4Wtczgi6KVA8VnhunqFApm06RP221yf9hwbhE63Ig [email protected]
The key's randomart image is:
+---[RSA 2048]----+
| ..o . . |
| .+.+. = . |
|..++ + + |
|.B.+ + = . |
|=.X + B S + . |
|o+ = + E * + |
|+ + . B . |
| . o = |
| o |
+----[SHA256]-----+
[root@localhost webvirtmgr]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host '192.168.222.140 (192.168.222.140)' can't be established.
ECDSA key fingerprint is SHA256:FkmNy5vPRVhOZGwZpvDsgPmo4WjilEinC9gpRbRiZQQ.
ECDSA key fingerprint is MD5:57:cc:00:bc:17:10:5d:1c:ed:ac:19:bf:7b:66:a3:62.
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
[email protected]'s password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh '[email protected]'"
and check to make sure that only the key(s) you wanted were added.
配置埠轉發
可以使用ss -antl查看埠情況
[root@localhost webvirtmgr]# ssh 192.168.222.140 -L localhost:8000:localhost:8000 -L localhost:6080:localhost:60
Last login: Wed Oct 5 17:08:52 2022 from 192.168.222.1
[root@localhost ~]# ss -antl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 5 192.168.122.1:53 *:*
LISTEN 0 128 *:22 *:*
LISTEN 0 100 127.0.0.1:25 *:*
LISTEN 0 128 127.0.0.1:6080 *:*
LISTEN 0 128 127.0.0.1:8000 *:*
LISTEN 0 128 :::22 :::*
LISTEN 0 100 ::1:25 :::*
LISTEN 0 128 ::1:6080 :::*
LISTEN 0 128 ::1:8000 :::*
配置nginx
[root@localhost ~]# cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak
[root@localhost ~]# vim /etc/nginx/nginx.conf
//在server參數中進行修改
刪除listen [::]:80;行
參數server_name行改成server_name localhost;
刪除root /usr/share/nginx/html;行
在include /etc/nginx/default.d/*.conf;行下添加
location / {
root html;
index index.html index.htm;
}
配置nginx虛擬主機
[root@localhost ~]# vim /etc/nginx/conf.d/webvirtmgr.conf
[root@localhost ~]# 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 $remote_addr;
proxy_connect_timeout 600;
proxy_read_timeout 600;
proxy_send_timeout 600;
client_max_body_size 1024M;
}
}
確保bind綁定本機的8000埠
[root@localhost ~]# vim /var/www/webvirtmgr/conf/gunicorn.conf.py
bind = '127.0.0.1:8000' //預設
backlog = 2048 //預設
[root@localhost ~]# grep bind /var/www/webvirtmgr/conf/gunicorn.conf.py
# bind - The socket to bind.
bind = '127.0.0.1:8000'
//確保此處綁定的是本機的8000埠，這個在nginx配置中定義了，被代理的埠
重啟nginx服務設置開機自啟，查看埠是否開啟
[root@localhost ~]# systemctl enable --now nginx
Created symlink from /etc/systemd/system/multi-user.target.wants/nginx.service to /usr/lib/systemd/system/nginx.service.
[root@localhost ~]# ss -antl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 *:80 *:*
LISTEN 0 5 192.168.122.1:53 *:*
LISTEN 0 128 *:22 *:*
LISTEN 0 100 127.0.0.1:25 *:*
LISTEN 0 128 127.0.0.1:6080 *:*
LISTEN 0 128 127.0.0.1:8000 *:*
LISTEN 0 128 :::22 :::*
LISTEN 0 100 ::1:25 :::*
LISTEN 0 128 ::1:6080 :::*
LISTEN 0 128 ::1:8000 :::*
設置supervisor
[root@localhost ~]# vim /etc/supervisord.conf
//在文件最後添加如下信息
#這裡command是一行
[program:webvirtmgr]
command=/usr/bin/python2 /var/www/webvirtmgr/manage.py run_gunicorn -c /var/www/webvirtmgr/conf/gunicorn.conf.py
directory=/var/www/webvirtmgr
autostart=true
autorestart=true
logfile=/var/log/supervisor/webvirtmgr.log
log_stderr=true
user=nginx
[program:webvirtmgr-console]
command=/usr/bin/python2 /var/www/webvirtmgr/console/webvirtmgr-console
directory=/var/www/webvirtmgr
autostart=true
autorestart=true
stdout_logfile=/var/log/supervisor/webvirtmgr-console.log
redirect_stderr=true
user=nginx
啟動supervisor並設置開機自啟
[root@localhost ~]# systemctl enable --now supervisord.service
Created symlink from /etc/systemd/system/multi-user.target.wants/supervisord.service to /usr/lib/systemd/system/supervisord.service.
配置nginx用戶
[root@localhost ~]# su - nginx -s /bin/bash
-bash-4.2$ ssh-keygen
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:U+al0qUqjCY2+jySrqJYJ/+mc9fkaVtgPovqsa9+qCE [email protected]
The key's randomart image is:
+---[RSA 2048]----+
| |
| |
| o o |
| = = |
| S B |
| o *.. |
| .E = +..+o.. |
|==.O..++o.=+ |
|X+o.+XB*o.o. |
+----[SHA256]-----+
-bash-4.2$ touch ~/.ssh/config
-bash-4.2$ echo -e "StrictHostKeyChecking=no\nUserKnownHostsFile=/dev/null" >> ~/.ssh/config
-bash-4.2$ chmod 0600 ~/.ssh/config
-bash-4.2$ ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]
/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/var/lib/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 '192.168.222.140' (ECDSA) to the list of known hosts.
[email protected]'s password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh '[email protected]'"
and check to make sure that only the key(s) you wanted were added.
-bash-4.2$ ssh [email protected]
Warning: Permanently added '192.168.222.140' (ECDSA) to the list of known hosts.
Last login: Wed Oct 5 17:34:44 2022 from 192.168.222.140
[root@localhost ~]# exit
logout
Connection to 192.168.222.140 closed.
-bash-4.2$ exit
logout
[root@localhost ~]#
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
bvirt SSH access]
Identity=unix-user:root
Action=org.libvirt.unix.manage
ResultAny=yes
ResultInactive=yes
ResultActive=yes
[root@localhost ~]# chown -R root.root /etc/polkit-1/localauthority/50-local.d/50-libvirt-remote-access.pkla
[root@localhost ~]# systemctl enable --now nginx
[root@localhost ~]# systemctl enable --now libvirtd
KVM web界面管理
修改nginx配置文件
[root@localhost ~]# vim /etc/nginx/nginx.conf
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
worker_rlimit_nofile 655350; //添加此行
對系統參數進行設置
[root@localhost ~]# vim /etc/security/limits.conf
//在文件最末尾寫入
* soft nofile 655350
* hard nofile 655350
重啟服務，重讀文件
[root@localhost ~]# sysctl -p
[root@localhost ~]# systemctl enable --now nginx
安裝novnc，並通過novnc_server啟動一個vnc
[root@localhost ~]# yum -y install novnc
[root@localhost ~]# chmod +x /etc/rc.d/rc.local
[root@localhost ~]# vim /etc/rc.d/rc.local
//在最末尾加入如下行
nohup novnc_server 192.168.222.140:5920 &
[root@localhost ~]# . /etc/rc.d/rc.local
[root@localhost ~]# nohup: 忽略輸入並把輸出追加到"nohup.out"
這裡會一直停在這裡
使用瀏覽器訪問
登錄用戶是之前設置的預設root，密碼也是之前設置的
添加連接
創建虛擬機
1、新建存儲
2、上傳鏡像，使用FinalShell,xftp或者xshell，再或者其他工具，將鏡像文件上傳到伺服器的/kvmdata目錄下存放
再開一個終端:
[root@localhost ~]# cd /kvmdata/
[root@localhost kvmdata]# ls
CentOS-7.4-x86_64-DVD-1708.iso
刷新一下網頁界面
添加網路
實例管理，現在去創建一個虛擬機
報錯解決
報錯:
fatal: unable to access 'http://github.com/retspen/webvirtmgr.git/': Failed connect to github.com:443; Connection refused
fatal: unable to access 'http://github.com/retspen/webvirtmgr.git/': TCP connection reset by peer
解決:
[root@localhost src]# git config --global -l
fatal: unable to read config file '/root/.gitconfig': ?????????
[root@localhost src]# env|grep -i proxy
