Linux systems with scripts to install virtual machines and their management, snapshots and virtual machine resets

To quickly install multiple virtual machines, you can take a snapshot of the original virtual machine hard disk files and install multiple virtual speeds using quick find is fairly fast, then I'll show you how to create a snapshot and write a simple shell command to install a virtual machine.

First, install the virtual machine

(1) Install with Shell script (2) Get full-end management of a virtual machine and hard disk file (3) Create a virtual machine snapshot installation

1. Shell Script Installation

   Switch to root user

   Edit Script vim/mnt/creatre_vm.sh, create_vm.sh is the name of the script, SH is the meaning of the script

   #!/bin/bash Command Run environment specified

   Virt-install \ Installing virtual machines

   --name \ Virtual machine name specified, which represents the first string of characters after the script

   --ram 1000 \ Memory

   --FILE/VAR/LIB/LIBVIRT/IMAGES/$1.IMG \ Hard Disk File

   --file-size 8 \ Hard disk File size

   --cdrom/var/ftp/pub/iso/rhel-server-7.1-x86_64-dvd.iso & Installation Source designation

   \ Wrap & put in the background, do not occupy the terminal

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Execute/MNT/CREATE_VM node2 Node2 is the name of the virtual machine created

Virtual Machine Node2 created successfully

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2. Get a front end file and a hard disk file to install

(1) Hard disk File:/var/lib/libvirt/images/under Vm.qcow (VM is the name of the virtual machine)

(2) Front-end management files:/etc/libvirt/qemu/under the Vm.xml

There are two files above to complete the virtual machine installation, the steps are as follows

(1) got the Node1.qcow,node1.xml

(2) Move the hard disk files to/var/lib/libvirt/images/, move the front-end management files to,/etc/libvirt/qemu/

(3) Display virtual machine

Temporary: Virsh Create Vm.xml

Permanent: Virsh define Vm.xml

3. The following

Second, virtual machine management

Virt-manager Opening the Graphics management tool

Virt-viewer vmname display virtual machine, Vmname represents the virtual machine name

Virsh List List of running VMS

Virsh list--all List all VMS

Virsh start Vmname Run the specified VM

Virsh shutdown vmname Normal shutdown of the specified VM

Virsh destroy Vmname forcibly ends the specified VM

Virsh Create vmname.xml Temporary restore specifies vm,vmname represents the front end management file

Virsh define Vmname.xml permanently recover VMS

Virsh undefine Vmname Delete the front-end management of the VM and does not delete the storage

1.virt List List of running VMS

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2.virsh list--all List all VMS

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3.virsh shutdown node2 normal shutdown node2

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4.virsh Start Node2 running Node2

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5.virsh destroy Node2 forcibly closed Node2

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6.virsh Create node2 Temporary recovery Node2

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7.virsh undefine node2 Remove front-end management

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8.virsh Define Node2.xml Permanent recovery

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Third, create a snapshot

1. A snapshot is like copying a file, and all operations are done on the copied file without affecting the original file.

2. Two important documents

   (1) Hard disk File:/var/lib/libvirt/images/

   (2) Front-end Management files:/etc/libvirt/qemu/(Recording virtual pre-segment graphics, data, information)

3. Create a Snapshot

   (1) Developing a Snapshot object:/var/lib/libvirt/images/file

   (2) Input command: qemu-img create-f qcow2-b vm_storage.qcow2 node1-snap.qcow2

   Vm_storage.qcow2 refers to the source file name Node1-snap.qcow2 refers to the snapshot file name

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4. Installing a virtual machine with a snapshot

Snapshot files are small

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Input Virt-manager

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Click on the top left small TV, select the last entry, Forward

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Click Browse,forward

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Select default, the snapshot file you just created, click chose Volume

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Click Forward

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Finish

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Node2 Installation Success

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Installing virtual machines with snapshots is fast

Iv. using snapshots, scripting to install virtual machines

1. Writing a file

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1. Node1.qcow is the snapshot name

   2.chmod +x cratevm.sh Add executable permissions to the file

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   3. Installation

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   Installation Successful

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   V. Resetting a virtual machine snapshot

   When a virtual machine snapshot is corrupted, you can call the script reset

   1. Edit the script file vim resetvm.sh

   & background run, \ line break

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3. chmod +x/mnt/resetvm.sh gives file executable capability

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5. Installation

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7. Installation Successful

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8. Continue editing this file &>/dev/null does not display information about the installation process

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   Perform

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   Installation Successful

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6.sh-x resetvm.sh shows if the installation process is normal, + normal

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Linux systems with scripts to install virtual machines and their management, snapshots and virtual machine resets