CentOS7.1 KVM虚拟化之虚拟机内存、CPU调整

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

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[root@kvm01 ~]# 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

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[root@kvm01 ~]# virsh setmem vm1-clone 524288

3.再次查看当前内存大小

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[root@kvm01 ~]# 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

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virsh shutdown vm1-clone

2.编辑虚拟机配置文件

修改内存大小、vcpu个数
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virsh edit vm1-clone
……
1048432
1048432
2
……

3.从配置文件启动虚拟机

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virsh create /etc/libvirt/qemu/vm1-clone.xml

4.查看当前内存大小

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[root@kvm01 ~]# 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

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[root@kvm01 ~]# virsh setmem vm1-clone 1048432

6.验证

查看当前内存大小
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[root@kvm01 ~]# virsh dominfo vm1-clone | grep memory
Max memory: 1048432 KiB
Used memory: 1048432 KiB
查看当前CPU个数
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[root@kvm01 ~]# virsh dominfo vm1-clone | grep CPU
CPU(s): 2
CPU time: 15.0s