Common installation and snapshot installation of virtual machines in Linux systems

One, virtual machine installation

1. Image interface Mode

> Add a virtual machine hard disk and change its size to 8G
> Insert Disk
> Read and install the disk
> Boot from hard drive

2. How to edit Scripts

#!/bin/bash# #命令运行环境的指定
virt-install \# #安装虚拟机
--name \# #虚拟机名称指定, representing the first string of characters after the script
--ram# #内存
--file/var/lib/libvirt/images/$1.qcow2, bus=virtio \# #硬盘文件
--file-size 8 \# #硬盘文件大小
--network sourse=br0,model=virtio \
--cdrom/var/ftp/pub/iso/rhel-server-7.1-x86_64-dvd.iso &# #安装源指定

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Second, management

Virt-manager# #开启图形管理工具
Virt-viewer Vmname# #显示虚拟机, Vmname represents the virtual machine name
Virsh List # #列出正在运行的vm
Virsh list--all# #列出所有vm
Virsh start Vmname# #运行指定vm
Virsh shutdown Vmname# #正常关闭指定vm
Virsh Destroy Vmname# #强行结束指定vm
Virsh Create Vmname.xml# #临时恢复指定vm, Vmname represents the front-end management file
Virsh define Vmname.xml# #永久恢复vm
Virsh undefine vmname# #删除vm的前端管理, storage is not deleted

# #前端管理文件存放位置:
/etc/libvirt/que
It's got hardware information inside it.
# #后端硬盘文件存放位置:
/var/lib/libvirt/iamges/
The system is installed in the hard disk file

Here's how:
1) Image Interface Recovery

Note: Back-end hard disk files are required

2) File Recovery

Note: The front-end management files and back-end hard disk files need to be backed up before
The recovery process is as follows:
>>Backup front end management files and hard disk files in/mnt/
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>>Delete Node2 front-end files
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>>The list of virtual machines in this system is as follows:
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>>Virtual Machine Recovery
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>>The list of virtual machines in this system is as follows:
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3) Script Edit recovery

The script is as follows:
#!/bin/bash
Virt-install \
--name node1 \
--ram 1024 \
--FILE/VAR/LIB/LIBVIRT/IMAGES/NODE1.QCOW2 \
--file-size 8 \
--vcpus 1 \
--import &

The graphical interface deletes the front-end management files and the back-end hard disk files as follows:
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three, virtual machine snapshot

Qemu-img create-f qcow2-b Vm2.qcow2 node1.qcow2
Virtual machine Snapshot principle: The snapshot command generates a snapshot file, which reads the master and makes changes in the snapshot virtual machine, if it is deleted by bad.

1) How to create a snapshot virtual machine:

Generate snapshot file, image mode insert Build
Directly edit the script file, run the next key to generate

The process is as follows:
@@ 法 One
[Email protected] mnt]# vim create_vm.sh
[Email protected] mnt]#/create_vm.sh haha
Success
[email protected] mnt]# cat create_vm.sh
#!/bin/bash
qemu-img create-f qcow2-b/var/lib/libvirt/images/node1.qcow \
/var/lib/libvirt/images/$1.qcow &>/dev/null

Virt-install \
--name \
--ram 1024 \
--file/var/lib/libvirt/images/$1.qcow \
--file-size 8 \
--import &>/dev/null &
Echo Success

@@ 法 Two
To do this, you can also edit the script file in the following ways:
#!/bin/bash
Virsh Destroy $ &>/dev/null
Virsh Undefine $ &>/dev/null
qemu-img create-f qcow2-b/var/lib/libvirt/images/$1.qcow2 \
/var/lib/libvirt/images/$2.qcow2 &>/dev/null
Virt-install \
--name
--ram 1000 \
--DISK/VAR/LIB/LIBVIRT/IMAGES/$2.QCOW2 \
--import &>/dev/null &

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Common installation and snapshot installation of virtual machines in Linux systems