前情
需求就是普普通通的给kvm下的一台虚拟机加1000G的磁盘
方案一
1.查看目标 vm4的磁盘 情况
2. 在kvm主机上创建一个新的虚拟磁盘
root@szo-192:/opt/kvm/image# qemu-img create -f qcow2 -o size=1000G /opt/kvm/image/kvm-vm4-02-1T.qcow2
Formatting '/opt/kvm/image/kvm-vm4-02-1T.qcow2', fmt=qcow2 size=1073741824000 cluster_size=65536 lazy_refcounts=off refcount_bits=16
3. 从kvm主机挂载盘到vm4上
root@szo-192:/opt/kvm/image# ls
kvm-vm1_1.qcow2 kvm-vm2.qcow2 kvm-vm4-02-1T.qcow2 kvm-vm5.qcow2 kvm-vm7.qcow2
kvm-vm1.qcow2 kvm-vm3.qcow2 kvm-vm4.qcow2 kvm-vm6.qcow2 kvm-vm8.qcow2
root@szo-192:/opt/kvm/image# virsh attach-disk --domain kvm-vm4 --source /opt/kvm/image/kvm-vm4-02-1T.qcow2 --target vdb --targetbus virtio --driver qemu --subdriver qcow2 --sourcetype file --cache none --persistent
Disk attached successfully
4.验证
kvm 主机端： virsh domblklist kvm-vm4
在vm4
扩容 /home 分区
[root@vm4 ~]# fdisk -l
Disk /dev/vda: 536.9 GB, 536870912000 bytes, 1048576000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a6a14
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 18616319 8258560 82 Linux swap / Solaris
/dev/vda3 18616320 123473919 52428800 83 Linux
/dev/vda4 123473920 1048575999 462551040 5 Extended
/dev/vda5 123475968 1048575999 462550016 83 Linux
Disk /dev/vdb: 1073.7 GB, 1073741824000 bytes, 2097152000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
[root@vm4 ~]#
[root@vm4 ~]#
[root@vm4 ~]#
[root@vm4 ~]# fdisk /dev/vdb
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xff552d5a.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-2097151999, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-2097151999, default 2097151999):
Using default value 2097151999
Partition 1 of type Linux and of size 1000 GiB is set
Command (m for help): p
Disk /dev/vdb: 1073.7 GB, 1073741824000 bytes, 2097152000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xff552d5a
Device Boot Start End Blocks Id System
/dev/vdb1 2048 2097151999 1048574976 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@vm4 ~]# partprobe
[root@vm4 ~]# fdisk -l
Disk /dev/vda: 536.9 GB, 536870912000 bytes, 1048576000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a6a14
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 18616319 8258560 82 Linux swap / Solaris
/dev/vda3 18616320 123473919 52428800 83 Linux
/dev/vda4 123473920 1048575999 462551040 5 Extended
/dev/vda5 123475968 1048575999 462550016 83 Linux
Disk /dev/vdb: 1073.7 GB, 1073741824000 bytes, 2097152000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xff552d5a
Device Boot Start End Blocks Id System
/dev/vdb1 2048 2097151999 1048574976 83 Linux
[root@vm4 ~]#
[root@vm4 ~]#
[root@vm4 ~]#
[root@vm4 ~]# pvcreate /dev/vdb1
Physical volume "/dev/vdb1" successfully created.
[root@vm4 ~]# vgdisplay
selabel_open failed: No such file or directory
[root@vm4 ~]# pvdisplay
"/dev/vdb1" is a new physical volume of "<1000.00 GiB"
--- NEW Physical volume ---
PV Name /dev/vdb1
VG Name
PV Size <1000.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID CNDRjs-534c-FK5w-EcCY-WAr1-EKsk-RMyWQw
[root@vm4 ~]# vgcreate -s 64M centos /dev/vdb1
Volume group "centos" successfully created
[root@vm4 ~]# pvdisplay
--- Physical volume ---
PV Name /dev/vdb1
VG Name centos
PV Size <1000.00 GiB / not usable 63.00 MiB
Allocatable yes
PE Size 64.00 MiB
Total PE 15999
Free PE 15999
Allocated PE 0
PV UUID CNDRjs-534c-FK5w-EcCY-WAr1-EKsk-RMyWQw
[root@vm4 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 0 0 wz--n- <999.94g <999.94g
[root@vm4 ~]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size <999.94 GiB
PE Size 64.00 MiB
Total PE 15999
Alloc PE / Size 0 / 0
Free PE / Size 15999 / <999.94 GiB
VG UUID cPr09p-NEI9-AqzI-dplr-236J-cY4q-89WajD
[root@vm4 ~]# pvdisplay
--- Physical volume ---
PV Name /dev/vdb1
VG Name centos
PV Size <1000.00 GiB / not usable 63.00 MiB
Allocatable yes
PE Size 64.00 MiB
Total PE 15999
Free PE 15999
Allocated PE 0
PV UUID CNDRjs-534c-FK5w-EcCY-WAr1-EKsk-RMyWQw
[root@vm4 ~]# mkdir /data
[root@vm4 ~]# lvcreate -L 999G -n data centos
Logical volume "data" created.
[root@vm4 ~]# echo $?
0
[root@vm4 ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/data
LV Name data
VG Name centos
LV UUID pFjVfe-WyxD-Wldo-zkyr-JDhY-mt2a-JK0W61
LV Write Access read/write
LV Creation host, time vm4, 2023-06-19 17:31:11 +0800
LV Status available
# open 0
LV Size 999.00 GiB
Current LE 15984
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 252:0
[root@vm4 ~]# mkfs.xfs /dev/centos/data
meta-data=/dev/centos/data isize=512 agcount=4, agsize=65470464 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=261881856, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=127872, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@vm4 ~]# echo $?
0
[root@vm4 ~]# vim /etc/fstab
[root@vm4 ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Jun 13 05:25:45 2023
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=76f19609-5d15-47ec-8334-1070e09a71a6 / xfs defaults 0 0
UUID=5b531ad0-8ba7-443c-b873-cfedd11caaa3 /boot xfs defaults 0 0
UUID=3ed24818-0c16-4e69-9cf9-de77429a868f /home xfs defaults 0 0
#UUID=16616dc6-ef8f-4cc2-be9a-45897bd963fa swap swap defaults 0 0
/dev/centos/data /data xfs defaults 0 0
[root@vm4 ~]# mount -a
[root@vm4 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 102M 7.7G 2% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/vda3 50G 3.5G 47G 7% /
/dev/vda5 441G 1.9G 440G 1% /home
/dev/vda1 1014M 170M 845M 17% /boot
/dev/mapper/centos-data 999G 33M 999G 1% /data
方案二
#第一：创建一块磁盘
qemu-img create -f raw /kvm-hosts/kvm-web011.raw 10G
#第二：编辑xml文件，在原本磁盘信息的下面，添加如下内容
virsh edit kvm-web01
#注意点：vdb，virtio，type，file
#第三：启动虚拟机，并检查配置
virsh start kvm-web01
ps -ef |grep kvm
#第四：进入虚拟机，格式化，挂载使用
