kvm虚拟机扩容系统盘

Posted 2021-12-18

一,宿主机扩容虚拟机系统盘

环境	文件系统
CentOS 7	XFS

1.1查看虚拟机(以下操作在宿主机上)

[[email protected] ~]# virsh list
 4     office-com-ldap-01             running

1.2查看虚拟机系统盘

[[email protected] ~]# virsh domblklist office-com-ldap-01 
目标     源
------------------------------------------------
vda        /home/office-com-ldap-01/office-com-ldap-01.system.qcow2
hda        -

1.3原始系统盘大小

[[email protected] ~]# qemu-img info /home/office-com-ldap-01/office-com-ldap-01.system.qcow2
virtual size: 15G (16106127360 bytes)
[[email protected] ~]# virsh shutdown office-com-ldap-01 很重要要先关闭虚拟机

1.4扩容后

[[email protected] ~]# qemu-img resize /home/office-com-ldap-01/office-com-ldap-01.system.qcow2 +5G
[[email protected] ~]# qemu-img info /home/office-com-ldap-01/office-com-ldap-01.system.qcow2
virtual size: 20G (21474836480 bytes)
[[email protected] ~]# virsh start office-com-ldap-01

二,虚拟机内查看(以下操作在kvm虚拟机中)
2.1查看是否增加

2.2给未分配的空间分区



2.3刷新分区表

[[email protected] ~]# partprobe 

2.4添加到卷组(dev/centos/root)

[[email protected] ~]# pvcreate /dev/vda3
  Physical volume "/dev/vda3" successfully created.
[[email protected] ~]# pvs
  PV         VG     Fmt  Attr PSize  PFree
  /dev/vda2  centos lvm2 a--  <9.00g    0 
  /dev/vda3         lvm2 ---   5.00g 5.00g
[[email protected] ~]# vgextend centos /dev/vda3
  Volume group "centos" successfully extended
[[email protected] ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree 
  centos   2   2   0 wz--n- 13.99g <5.00g
[[email protected] ~]# lvextend -l +100%FREE /dev/mapper/centos-root
  New size given (1279 extents) not larger than existing size (2047 extents)
[[email protected] ~]# xfs_growfs /dev/mapper/centos-root
[[email protected] ~]# df -Th

三,windows打开磁盘管理器点击合并卷就可以了比linux简单