CentOS-7 disk partition expansion

The existing disk storage of the server is "80G", and now it needs to be expanded online to "100G"

键入命令：fdisk -l

Proxmox VE interface to resize disk

After the adjustment is complete, check the disk size on the server

键入命令：fdisk -l

create partition

键入命令：fdisk /dev/sda
        键入：n （增加分区）
键入：p（增加主分区）
        键入：回车（"分区号、起始扇区 " 保持默认）
最后：w(保存并退出)

Check the disk partition information to see if there is a new partition "/dev/sda3"

键入命令：fdisk -l

create physical volume

键入命令：pvcreate /dev/sda3
	如果提示sda3找不到，键入：partprobe 或者 重启虚拟机

Use vgscan to query physical volume names

键入命令：vgscan

Use vgextend to add a new physical volume extension "centos"

 1. 键入命令：vgextend centos /dev/sda3
 2. 键入命令：lvextend -L +20G /dev/mapper/centos-root
 	 ”/dev/mapper/centos-root“ 为要扩展的分区名称

Use fdisk -l to view "/dev/mapper/centos-root" file system size changes

键入命令：fdisk -l

Use df -h to see that the "/" directory has not been changed, and the file system needs to be expanded

 1. 键入命令：df -h 
 2. 键入命令：xfs_growfs /dev/mapper/centos-root 
 3. 键入命令：df -h