一.修改kvm虚拟机的配置
1、virsh edit centos7 找到“memory”和“vcpu”标签，将 <name>centos7</name> <uuid>2220a6d1-a36a-4fbb-8523-e078b3dfe795</uuid> <memory unit=‘KiB‘>2097152</memory> <currentMemory unit=‘KiB‘>2097152</currentMemory> <vcpu placement=‘static‘>1</vcpu> 改为： <name>centos7</name> <uuid>2220a6d1-a36a-4fbb-8523-e078b3dfe795</uuid> <memory unit=‘KiB‘>3145728</memory> <currentMemory unit=‘KiB‘>3145728</currentMemory> <vcpu placement=‘static‘>2</vcpu>
virsh define /etc/libvirt/qemu/centos7.xml
启动虚拟机
virsh start centos7
调整前虚拟机信息
[root@localhost kvm]# virsh dominfo centos7 Id: - Name: centos7 UUID: 2220a6d1-a36a-4fbb-8523-e078b3dfe795 OS Type: hvm State: shut off CPU(s): 1 Max memory: 2097152 KiB Used memory: 2097152 KiB Persistent: yes Autostart: disable Managed save: no Security model: none Security DOI: 0
调整后虚拟机信息
[root@localhost kvm]# virsh dominfo centos7 Id: - Name: centos7 UUID: 2220a6d1-a36a-4fbb-8523-e078b3dfe795 OS Type: hvm State: shut off CPU(s): 2 Max memory: 3145728 KiB Used memory: 3145728 KiB Persistent: yes Autostart: disable Managed save: no Security model: none Security DOI: 0
原文：https://www.cnblogs.com/jimmy-xuli/p/9152651.html