How to reinstall the linux system

The original partition /data of the Linux system has data. To reinstall the system without formatting the /data partition
need to prepare a virtual machine with a /data partition

Then load the ISO and start reinstalling and keep the /data partition
Load directly to the partition interface
Follow what you learned at the beginning The /data partition is 2048MB, so just choose to keep this partition

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Then delete the other partitions Then repartition

Then wait for the system to be reinstalled as usual
After the system is reinstalled, go in and check the /data partition file, which still proves that it has been successful.

Add a disk to the system and use LVM management to expand the existing volume group
Enter the system and view the partition df -h

You can see the two partitions using LVM when installing the system: /, /var
View the volume group name and volume group usage vgdisplay

Check the space status of the current logical volume, as shown below:

. Now I feel that 8G of /var is not enough, and I want to expand it to 28G.
Insert a new 20G hard disk; use 'fdisk -l' to view

Format partition operation 'fsdisk /dev/sdb'

Set the newly added disk to LVM mode

Confirm the partition

Create the newly added partition /dev/sdb1 as a physical volume

Expand the volume group centos. Expand the physical volume /dev/sdb1 to centos

At this time, centos has 20G free space. Expand all /dev/sdb1 to /var

At this time, although the 20G disk has been extended to /var, it has not been written to the file system. Enter /etc/fstab to confirm

Write to the file system to make the expansion effective

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