CentOS7中KVM虚拟机内存、CPU调整

调小虚拟机内存

调小虚拟机内存可以动态实现，不用关机

# 查看当前内存大小
# virsh dominfo vm1-clone | grep memory 

Max memory:     786432 KiB 
Used memory:    786432 KiB 

# 设置虚拟机内存大小为512MB=512*1024=524288
# virsh setmem vm1-clone 524288

# 再次查看当前内存大小
# virsh dominfo vm1-clone | grep memory 

Max memory:     786432 KiB 
Used memory:    524288 KiB 

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

# 关闭虚拟机
# virsh shutdown vm1-clone 

# 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> 

...... 

# 从配置文件启动虚拟机
# virsh create /etc/libvirt/qemu/vm1-clone.xml 

# 查看当前内存大小
# virsh dominfo vm1-clone | grep memory 

Max memory:     1048432 KiB 
Used memory:    524288 KiB

# 设置虚拟机内存大小为1G
# virsh setmem vm1-clone 1048432 

# 查看当前内存大小
# virsh dominfo vm1-clone | grep memory 

Max memory:     1048432 KiB 
Used memory:    1048432 KiB 

# 查看当前CPU个数
# virsh dominfo vm1-clone | grep CPU 

CPU(s):         2 
CPU time:       15.0s