kvm虛擬機擴容系統盤

一,宿主機擴容虛擬機系統盤

環境	文件系統
CentOS 7	XFS

1.1查看虛擬機(如下操做在宿主機上)

[root@office-prd-kvm-01 ~]# virsh list
 4     office-com-ldap-01             running

1.2查看虛擬機系統盤

[root@office-prd-kvm-01 ~]# virsh domblklist office-com-ldap-01 
目標     源
------------------------------------------------
vda        /home/office-com-ldap-01/office-com-ldap-01.system.qcow2
hda        -

1.3原始系統盤大小

[root@office-prd-kvm-01 ~]# qemu-img info /home/office-com-ldap-01/office-com-ldap-01.system.qcow2
virtual size: 15G (16106127360 bytes)
[root@office-prd-kvm-01 ~]# virsh shutdown office-com-ldap-01 很重要要先關閉虛擬機

1.4擴容後

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

二,虛擬機內查看(如下操做在kvm虛擬機中)
2.1查看是否增長

2.2給未分配的空間分區



2.3刷新分區表

[root@office-com-ldap-01 ~]# partprobe

2.4添加到卷組(dev/centos/root)

[root@office-com-ldap-01 ~]# pvcreate /dev/vda3
  Physical volume "/dev/vda3" successfully created.
[root@office-com-ldap-01 ~]# pvs
  PV         VG     Fmt  Attr PSize  PFree
  /dev/vda2  centos lvm2 a--  <9.00g    0 
  /dev/vda3         lvm2 ---   5.00g 5.00g
[root@office-com-ldap-01 ~]# vgextend centos /dev/vda3
  Volume group "centos" successfully extended
[root@office-com-ldap-01 ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree 
  centos   2   2   0 wz--n- 13.99g <5.00g
[root@office-com-ldap-01 ~]# lvextend -l +100%FREE /dev/mapper/centos-root
  New size given (1279 extents) not larger than existing size (2047 extents)
[root@office-com-ldap-01 ~]# xfs_growfs /dev/mapper/centos-root
[root@office-com-ldap-01 ~]# df -Th

三,windows打開磁盤管理器點擊合併卷就能夠了比linux簡單

四,單分區擴容(系統之外的分區,無lvm)

4.1宿主機上查詢要擴容的盤符位置

[root@office-com-op-virt-01 vm-images]# virsh domblklist office-com-kvm-blc_eos-01
Target     Source
------------------------------------------------
vda        /data/vm-images/office-com-kvm-blc_eos-01.system.qcow2
vdb        /data/vm-images/office-com-kvm-blc_eos-01.disk01.qcow2 要擴容的

[root@office-com-op-virt-01 vm-images]# qemu-img info /data/vm-images/office-com-kvm-blc_eos-01.disk01.qcow2
image: /data/vm-images/office-com-kvm-blc_eos-01.disk01.qcow2
file format: qcow2
virtual size: 400G (429496729600 bytes)

[root@office-com-op-virt-01 ~]# virsh shutdown office-com-kvm-blc_eos-01
 [root@office-com-op-virt-01 ~]# qemu-img resize /data/vm-images/office-com-kvm-blc_eos-01.disk01.qcow2 +400G  //在原來400G基礎上在次添加400G
 [root@office-com-op-virt-01]# qemu-img info /data/vm-images/office-com-kvm-blc_eos-01.disk01.qcow2 
virtual size: 800G (858993459200 bytes) 磁盤已經增長
[root@office-com-op-virt-01 ~]# virsh start office-com-kvm-blc_eos-01 開啓虛擬機

4.2虛擬機內操做

[root@office-com-kvm-blc_eos-01 ~]# fdisk -l|grep vdb 查詢已經增長
Disk /dev/vdb: 859.0 GB, 858993459200 bytes, 1677721600 sectors
[root@office-com-kvm-blc_eos-01 ~]# df -Th|grep vdb
/dev/vdb            ext4      394G  219G  156G  59% /data  空間並無改變分區格式ext4
[root@office-com-kvm-blc_eos-01 ~]# umount /data
[root@office-com-kvm-blc_eos-01 ~]# e2fsck -f /dev/vdb   檢查分區
[root@office-com-kvm-blc_eos-01 ~]# resize2fs /dev/vdb   同步分區
[root@office-com-kvm-blc_eos-01 ~]# mount /dev/vdb /data
[root@office-com-kvm-blc_eos-01 ~]# df -Th|grep vdb
/dev/vdb                ext4      788G  319G  429G  43% /data

注意: ext4分區同步使用e2fsck -f /dev/分區名 resize2fs /dev/分區名xfs文件系統使用xfs_growfs /dev/分區名或者lvm的卷名