pve环境下kvm虚拟机硬盘root分区无损扩容的方法

Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 17.2GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type      File system     Flags
 1      1049kB  7565MB  7564MB  primary   ext4            boot
 2      7567MB  8589MB  1022MB  extended
 5      7567MB  8589MB  1022MB  logical   linux-swap(v1)  swap

parted /dev/sda

(parted) p
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 17.2GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type      File system     Flags
 1      1049kB  7565MB  7564MB  primary   ext4            boot
 2      7567MB  8589MB  1022MB  extended
 5      7567MB  8589MB  1022MB  logical   linux-swap(v1)  swap

#不需要swap分区，所以删除第二分区
rm 2

(parted) p                                                                
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 17.2GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  7565MB  7564MB  primary  ext4         boot

(parted) resizepart 1 100%                                                
Warning: Partition /dev/sda1 is being used. Are you sure you want to continue?
Yes/No? yes                                                               
Error: Error informing the kernel about modifications to partition /dev/sda1 -- Device or resource busy.  This means Linux won't know about any changes you made to /dev/sda1 until
you reboot -- so you shouldn't mount it or use it in any way before rebooting.
Ignore/Cancel? i                                                          
Error: Partition(s) 5 on /dev/sda have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use.  As a result, the old
partition(s) will remain in use.  You should reboot now before making further changes.
Ignore/Cancel? I                                                          
(parted) p                                                                
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 17.2GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  17.2GB  17.2GB  primary  ext4         boot

(parted) quit