Virtual linux disk expansion under VM VirtualBoX

My VirtualBox virtual machine linux system has a total of 8 gigabytes of disks. I need to expand the capacity.

Reference blog: https://www.cnblogs.com/anjingshen/archive/2015/10/17/4887426.html

Reference blog: http://blog.jues.org.cn/post/resize2fs-bad-magic-number-in-super-block-dang-chang-shi-da-kai-devcentosvir-centos7root-shi-zhao-bu-dao-you-xiao-de-wen-jian-xi-tong-chao-ji-kuai-..html

The steps for capacity expansion are as follows:

1. Add a new virtual disk and create it as prompted.

2. There is an extra sdb in lsblk query.

3. Partition and format the new hard disk

Type "fdisk / dev/sdb" to start partitioning the new hard drive

Type "n" on the new command line to create a new partition

Enter directly as the main partition

Type the partition number, or enter directly by default 1

Enter defaults to 2048 as the start sector of this partition.

Enter defaults to the last sector as the end sector

Type "w" to save and exit, now get the / dev/sdb1 partition, it is recommended to restart the following virtual machines

4. Add a new partition to lvm and expand its capacity

Type "pvcreate / dev/sdb1"

Physical volume "/ dev/hda4" successfully created

Type "vgs" to view the volume group name, such as "centos" or "VolGroup00"

Type "vgextend centos / dev/sdb1" to add a new partition to the volume group

Type "lvs" to view the name of the logical volume to be expanded, such as "root"

Type "lvextend-L + 2048m / dev/centos/root" to expand the logical partition, where "+ 2048M" indicates an increase of 2G space (usually this is smaller than 2048).

Type "resize2fs-p / dev/centos/root" to activate the new space

Note: if it is a xfs file system, you cannot use resize2fs, but use xfs_growfs / dev/centos/root to activate it.