kvm初体验之八：调整vm的vcpu, memory, disk大小

假设host上创建的vm的名字为vm1。

1. 查看vm1的domain information

[root@tanghuimin thm]# virsh dominfo vm1 Id: 10 Name: vm1 UUID: e2597379-5cc5-4ffa-0531-a073a81c5811 OS Type: hvm State: running CPU(s): 1 CPU time: 52.6s Max memory: 1048576 KiB Used memory: 1048576 KiB Persistent: yes Autostart: disable Managed save: no Security model: selinux Security DOI: 0 Security label: system_u:system_r:svirt_t:s0:c790,c799 (enforcing)

2. 修改vm1的vcpu, memory

1）实时修改vcpu，memory

virsh setvcpus vm1 xxx #数值不能超过vm1.xml中配置的vcpu值 virsh setmaxmem vm1 xxx #vm1处于shut off状态时才能设置成功 virsh setmem vm1 xxx #数值不能超过maxmem

2）配置文件修改vcpu, memory

修改vm1的配置文件

virsh edit vm1

<memory>对应dominfo中的Max memory

<currentMemory>对应dominfo中的Used memory

<vcpu>对应dominfo中的CPU(s)

<memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>1048576</currentMemory> <vcpu placement='static'>1</vcpu>

将vm1先关机再启动即可生效

virsh destroy vm1 virsh start vm1

3. 为vm1扩展一个10G的disk

生成一个大小为10G的磁盘文件/vm/vm1-add

dd if=/dev/zero of=/vm/vm1-add bs=1M count=10240

修改vm1的配置文件

virsh edit vm1

vm1现有的磁盘文件为/vm/vm1

<disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source file='/vm/vm1'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk>

在后面追加如下几行

<disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source file='/vm/vm1-add'/> <target dev='hdb' bus='ide'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk>

将vm1先关机再启动即可生效

virsh destroy vm1 virsh start vm1

查看vm1的磁盘信息

root@localhost ~]# fdisk -l| grep Disk Disk /dev/sda: 2147 MB, 2147483648 bytes Disk identifier: 0x000e3e47 Disk /dev/sdb: 10.7 GB, 10737418240 bytes Disk identifier: 0x00000000 Disk /dev/mapper/VolGroup-lv_root: 1405 MB, 1405091840 bytes Disk identifier: 0x00000000 Disk /dev/mapper/VolGroup-lv_swap: 213 MB, 213909504 bytes Disk identifier: 0x00000000