kvm虚拟机扩容系统盘

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(如下操做在宿主机上)

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

1.2查看虚拟机系统盘

[root@office-prd-kvm-01 ~]# 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

[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 很重要要先关闭虚拟机

1.4扩容后

[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,虚拟机内查看(如下操做在kvm虚拟机中)
2.1查看是否增长

2.2给未分配的空间分区



2.3刷新分区表

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

2.4添加到卷组(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打开磁盘管理器点击合并卷就能够了比linux简单

四,单分区扩容(系统之外的分区,无lvm)

4.1宿主机上查询要扩容的盘符位置

[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 要扩容的

[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  //在原来400G基础上在次添加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) 磁盘已经增长
[root@office-com-op-virt-01 ~]# virsh start office-com-kvm-blc_eos-01 开启虚拟机

4.2虚拟机内操做

[root@office-com-kvm-blc_eos-01 ~]# fdisk -l|grep vdb 查询已经增长
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  空间并无改变分区格式ext4
[root@office-com-kvm-blc_eos-01 ~]# umount /data
[root@office-com-kvm-blc_eos-01 ~]# e2fsck -f /dev/vdb   检查分区
[root@office-com-kvm-blc_eos-01 ~]# resize2fs /dev/vdb   同步分区
[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分区同步使用e2fsck -f /dev/分区名 resize2fs /dev/分区名xfs文件系统使用xfs_growfs /dev/分区名或者lvm的卷名