Introduction to root directory expansion under Linux system

1. Check Linux disk status

df -lh 

The lsblk command is used to list information about all available block devices and display the dependencies between them.

Create a new disk partition

fdisk /dev/vda 

Change the new partition disk type

Save the partition operation and restart the operating system

Formatting a partition

mkfs.xfs /dev/vda3 

Create a new physical volume

pvcreate /dev/vda3

#The pvcreate command is used to initialize the physical hard disk partition as a physical volume for LVM use.

View lvm volume group information

vgdisplay

#The vgdisplay command is used to display the information of the LVM volume group. If the "volume group" parameter is not specified, the properties of all volume groups are displayed separately

Adding physical volumes to a volume group

vgextend /dev/mapper/vg --maycur /dev/vda3

#Use df -h to view the name of the volume group to be added. No need to add root

Start expansion

lvextend -L +49G /dev/mapper/vg --maycur-root /dev/vda3

#lvextend command is used to expand the space size of the logical volume online without interrupting the application's access to the logical volume

Synchronize file system

xfs_growfs /dev/mapper/vg --maycur-root 

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