kvm基础 虚拟机内存、CPU调整

转自http://blog.csdn.net/hnhuangyiyang/article/details/50902223

一、调小虚拟机内存

调小虚拟机内存可以动态实现，不用关机
1.查看当前内存大小

[[email protected] ~]# virsh dominfo vm1-clone | grep memory
Max memory: 786432 KiB
Used memory: 786432 KiB
2.设置虚拟机内存大小为512MB

[[email protected] ~]# virsh setmem vm1-clone 524288
3.再次查看当前内存大小

[[email protected] ~]# virsh dominfo vm1-clone | grep memory
Max memory: 786432 KiB
Used memory: 524288 KiB
二、增大虚拟机内存、增加虚拟机CPU个数

增大虚拟机内存、增加虚拟机CPU个数需要首先关机虚拟机
1.关闭虚拟机
virsh shutdown vm1-clone
2.编辑虚拟机配置文件
修改内存大小、vcpu个数

virsh edit vm1-clone
......
<memory unit=‘KiB‘>1048432</memory>
<currentMemory unit=‘KiB‘>1048432</currentMemory>
<vcpu placement=‘static‘>2</vcpu>
......
3.从配置文件启动虚拟机

virsh create /etc/libvirt/qemu/vm1-clone.xml
4.查看当前内存大小

[[email protected] ~]# virsh dominfo vm1-clone | grep memory
Max memory: 1048432 KiB
Used memory: 524288 KiB
5.设置虚拟机内存大小为1G

[[email protected] ~]# virsh setmem vm1-clone 1048432
6.验证
查看当前内存大小

[[email protected] ~]# virsh dominfo vm1-clone | grep memory
Max memory: 1048432 KiB
Used memory: 1048432 KiB
查看当前CPU个数

[[email protected] ~]# virsh dominfo vm1-clone | grep CPU
CPU(s): 2
CPU time: 15.0s