配置CPU
virsh edit CentOS-7-x86_64
修改cpu从静态1个到动态2个，只用1个
<vcpu placement='static'>1</vcpu>→ <vcpu placement='auto' current="1">2</vcpu>
关闭、启动虚拟机后cat /proc/cupinfo
processor 0 代表1个
热添加cpu到2个，contos7才支持，只支持热添加，不支持热减少 virsh setvcpus CentOS-7-x86_64 2 --live
cat /proc/cupinfo
processor 1 代表2个
查看cpu工作情况
[root@kvm1 ~]# cat /proc/interrupts
CPU0 CPU1
0: 145 0 IO-APIC-edge timer
1: 10 0 IO-APIC-edge i8042
6: 3 0 IO-APIC-edge floppy
8: 0 0 IO-APIC-edge rtc0
9: 1 0 IO-APIC-fasteoi acpi
10: 0 0 IO-APIC-fasteoi uhci_hcd:usb3, uhci_hcd:usb4
11: 26 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb2, virtio3
12: 15 0 IO-APIC-edge i8042
14: 535 0 IO-APIC-edge ata_piix
15: 0 0 IO-APIC-edge ata_piix
24: 0 0 PCI-MSI-edge virtio2-config
25: 5675 0 PCI-MSI-edge virtio2-req.0
26: 0 0 PCI-MSI-edge virtio0-config
27: 459 0 PCI-MSI-edge virtio0-input.0
28: 1 0 PCI-MSI-edge virtio0-output.0
29: 0 0 PCI-MSI-edge virtio1-config
30: 5 0 PCI-MSI-edge virtio1-virtqueues
NMI: 0 0 Non-maskable interrupts
LOC: 25713 2829 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 0 0 Performance monitoring interrupts
IWI: 1073 1 IRQ work interrupts
RTR: 0 0 APIC ICR read retries
RES: 6 48 Rescheduling interrupts
CAL: 0 350 Function call interrupts
TLB: 0 2 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
DFR: 0 0 Deferred Error APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 2 1 Machine check polls
ERR: 0
MIS: 0
PIN: 0 0 Posted-interrupt notification event
PIW: 0 0 Posted-interrupt wakeup event
配置内存
virsh edit CentOS-7-x86_64
修改最大内存和当前内存，内存可以热添加和热减少
<memory unit='KiB'>2048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
查看当前内存 virsh qemu-monitor-command CentOS-7-x86_64 --hmp --cmd info balloon 设置内存为600M virsh qemu-monitor-command CentOS-7-x86_64 --hmp --cmd balloon 600
硬盘 全镜像模式 raw：全占用，性能好 稀疏模式 qcow2：用多少，占用多少，支持压缩，快照功能。openstack首先 查看硬盘占用 root@kvm ~]# cd /opt [root@kvm opt]# qemu-img info CentOS7-x86_64.raw image: CentOS7-x86_64.raw file format: raw virtual size: 10G (10737418240 bytes) disk size: 1.2G 网络 编辑虚拟机网卡修改为桥接，让外部可以访问 命令添加网桥br0 brctl addbr br0 查看网桥 brctl show 将eth0加入br0 brctl addif br0 eth0 删除原eth0的ip ip addre del dev eth0 10.0.0.111/24 设置br0的ip ifconfig br0 10.0.0.111/24 up
virsh edit Centos6.5 修改
<interface type='default'> 改为<interface type='bridge'>
<source network='default'/> 改为<source bridge='br0'/> 在物理机中 eth0→新增BRIDGE=br0 br0→ TYPE=Bridge NAME=br0 DEVICE=br0
删除虚拟机 virsh undefine Centos6.5 关闭虚拟机电源 virsh destroy Centos6.5 挂起虚拟机 virsh suspend Centos6.5 恢复 virsh resume Centos6.5
