Practical Tips for Linux: Use snapshots to create virtual machines

Practical Tips for Linux: Use snapshots to create virtual machines

In daily learning, if you encounter cluster and load balancing experiments, you need to use a large number of virtual machines. If you create one by one, it is obviously very cost-effective and inefficient. So how can we use snapshots to create virtual machines today. The number of bytes _ ^ you want. As long as the memory is enough!

To create a snapshot of a VM, perform the following steps:

1. First, we need to create a stored logical volume to generate the template and snapshot file;
2. Create a snapshot template;
3. Create a snapshot.

1. Create a logical volume:

(1) fdisk/dev/sda (create an LVM logical volume and then re-scan the disk ;)


(2) partx-d/dev/sda
Partx-a/dev/sda

(3) create an lv file:

Pvcreate/dev/sda
Vgcreate-s 4 M vg1/dev/sda5
Lvcreate-L 10G-n base vg1

(4) Then you can create a virtual machine template:





In this case, you can install an ordinary virtual machine. After the restart, perform the following operations (because you have created a template, the template must be universal)

2. Create a template:

In the template virtual machine, perform the following operations:

1. Disable firewall and selinux (File Modification ):



Vim/etc/sysconfig/selinux


2. Modify the network configuration file and delete the NIC information:

Vim/etc/sysconfig/network-script/ifcfg-eth0




3. Modify the yum source to a stable address:

Vim/etc/yum. repos. d/yum. repo

For more details, please continue to read the highlights on the next page:

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