Kvm basic Command 2

1) View the port corresponding to the virtual machine

[root@localhost ~]# virsh vncdisplay test01:0:0====5900:1====5901

2) Suspend virtual machine

[root@localhost ~]# virsh suspend test01//suspend

[root@localhost ~]# virsh resume test01//resume

3) Start the machine automatically

[root@localhost ~]# virsh dominfo test01//See details

[root@localhost ~]# virsh autostart test01//boot

[root@localhost ~]# virsh dominfo test01//See details

test

[root@localhost ~]# reboot

//restart

[root@localhost ~]# virsh list

[root@localhost autostart]# cd /etc/libvirt/qemu/autostart[root@localhost autostart]# ll

4) Cancel startup and self-start

[root@localhost autostart]# virsh autostart --disable test01//cancel boot

[root@localhost autostart]# cd /etc/libvirt/qemu/autostart[root@localhost autostart]# ll

5) console login (xshell)

//Add to KVM domain

[root@localhost ~]# grubby --update-kernel=ALL --args="console=ttyS0"

Test it in xshell

[root@localhost autostart]# virsh console test01//Log in to the virtual machine. If you cannot log in, you can restart the kvm virtual machine.

If it doesn't, restart libvirtd.

[root@localhost ~]# systemctl restart libvirtd//Restart disk management on the host

RAW:(Naked Format) Default

It takes up a large space and has good performance, but it does not support snapshot function.

QCOW2:(copy on write)

Small footprint, support snapshot, performance is slightly worse than RAW.

Test Create Disk

Create disk: (default bare format)

[root@localhost ~]# mkdir /xgp #Create Test Directory [root@localhost ~]# cd /xgp/ #Enter Test Directory [root@localhost xgp]# qemu-img create 123.raw 5g #Create Disk

To view disk information:

[root@localhost xgp]# qemu-img info 123.raw

To create a disk in the specified format:

[root@localhost xgp]# qemu-img create -f qcow2 bdqn.qcow2 5g

Convert disk format:

[root@localhost xgp]# cd /kvm-vm/ #Enter disk file [root@localhost kvm-vm]# virsh destroy test01 #Shut down virtual machine [root@localhost kvm-vm]# qemu-img convert -f raw -O qcow2 centos.raw centos.qcow2//Convert disk format to qcow2

Take a snapshot:

[root@localhost kvm-vm]# virsh edit test01

[root@localhost kvm-vm]# virsh snapshot-create test01 Domain snapshot generated 1575255005 View snapshot information: [root@localhost kvm-vm]# virsh snapshot-list test01 Name generation time Status----------------------------------------------------- 1575255005 2019-12-02 10:50:05 +0800 shutoff timestamp: 1970: C language born, linux system born Kvm make some mistakes rm -rf /*xshell restore system according to snapshot: [root@localhost kvm-vm]# virsh snapshot-list test01 name generation time Status----------------------------------------------------- 1575255005 2019-12-02 10:50:05 +0800 shutoff 1575255330 2019-12-02 10:55:30 +0800 shutoff[root@localhost kvm-vm]# virsh snapshot-revert test01 1575255330 Delete snapshot: [root@localhost kvm-vm]# virsh snapshot-delete test01 1575255330

1)Enter the test1 virtual machine domain, set it to ping the periphery, and then deploy an httpd service, and change its default access interface content to: test+ own name.

Set it to ping the perimeter

Modify the network configuration of the kvm virtual machine

[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0

[root@localhost ~]# systemctl restart network

//Restart the network

Testing for connectivity

[root@localhost ~]# ping baidu.com

Deploy an httpd service and change its default access interface content to: test+ own name

Find epel on Ali mirror site https://developer.aliyun.com/mirror and copy one inside.

yum source for epel(RHEL 7) wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

Yum source performing replication on host

[root@localhost kvm-vm]# wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

Kvm virtual machine installation httpd

[root@localhost ~]# yum -y install httpd[root@localhost ~]# vi /var/www/html/index.html

//Create a test page

[root@localhost ~]# systemctl start httpd

//Open httpd service

2) Take a snapshot of the VM domain test1, although the disk type needs to be reformatted.

Convert disk format:

[root@localhost xgp]# cd /kvm-vm/ #Enter disk file [root@localhost kvm-vm]# virsh destroy test01 #Shut down virtual machine [root@localhost kvm-vm]# qemu-img convert -f raw -O qcow2 centos.raw centos.qcow2//Convert disk format to qcow2

[root@localhost kvm-vm]# virsh snapshot-create test01//take snapshot

3) What should I do if I want to be able to access HTTP services in the KVM domain?

The host does nginx reverse proxy

29 rz 30 tar zxf nginx-1.14.0.tar.gz 31 cd nginx-1.14.0/ 33 yum -y install gcc gcc-c++ autoconf automake make 35 yum -y install openssl-devel pcre-devel zlib-devel 36 ./ configure --prefix=/usr/local/nginx1.14 && make && make install 37 ln -s /usr/local/nginx1.14/sbin/nginx /usr/local/sbin/ 38 nginx 40 netstat -anpt | grep nginx

//host install nginx and turn on

[root@localhost ]# vim /usr/local/nginx1.14/conf/nginx.conf //point to http server [root@localhost nginx]# vim /etc/nginx/nginx.conf Add upstream backend {server 192.168.122.243:80 weight=1 max_failures =2 fail_timeout=10s;} Add Location module location / { #root html; #index index.html index.htm;proxy_pass http://backend; # nginx -s reload//Restart nginx

browser accesses

Experiment complete.