KVM主机动态更改cpu数量和内存大小
关机状态下设置最大cpu颗数和最大内存使用量：
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# virsh list --all
Id Name State
-------------------------------------------------
- bbotte shut off
# virsh setvcpus bbotte --maximum 4 --config
# virsh setmaxmem bbotte 1048576 --config
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用virsh命令调整cpu的数量（cpu颗数，已经上线主机只增不减）
现在主机状态：
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# virsh dominfo bbotte
Id: 2
Name: bbotte
UUID: bd22f444-ee7f-7f00-3d1b-1bb0d0857e43
OS Type: hvm
State: running
CPU(s): 4
CPU
time
: 152.3s
Max memory: 1048576 KiB
Used memory: 524288 KiB
Persistent:
yes
Autostart: disable
Managed save: no
Security model: none
Security DOI: 0
# ps -C qemu-kvm -o rss,cmd
RSS CMD
388736
/usr/libexec/qemu-kvm
-name bbotte -S -M rhel6.6.0 -
enable
-kvm -m 1024 -realtime mlock
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调整cpu数量：
virsh setvcpus [domain-name, domain-id or domain-uuid] [count]
减少核数：
[root@localhost ~]# virsh list --all
Id Name State
----------------------------------------------------
1 bbotte running
[root@localhost ~]# virsh setvcpus bbotte 2 #原来4颗cpu，现在为2颗，下图为guest主机
从2颗cpu增至4颗
# virsh setvcpus bbotte 4
guest主机里面：
# CPU 2 got hotplugged
Booting Node 0 Processor 2 APIC 0x2
CPU 3 got hotplugged
kvm-clock: cpu 2, msr 0:23167c1, secondary cpu clock
Disabled fast string operations
kvm-stealtime: cpu 2, msr 230e880
Will online and init hotplugged CPU: 2
Booting Node 0 Processor 3 APIC 0x3
kvm-clock: cpu 3, msr 0:23967c1, secondary cpu clock
Disabled fast string operations
kvm-stealtime: cpu 3, msr 238e880
Will online and init hotplugged CPU: 3
KVM调整内存使用量：
virsh setmem [domain-id or domain-name] [count]
现在的内存为512M，调整为800M的话：
# virsh setmem bbotte 819200 --config --live
或者# virsh setmem bbotte 800M
# virsh dominfo bbotte
Id: 2
Name: bbotte
UUID: bd22f444-ee7f-7f00-3d1b-1bb0d0857e43
OS Type: hvm
State: running
CPU(s): 4
CPU time: 163.9s
Max memory: 1048576 KiB
Used memory: 819200 KiB
Persistent: yes
Autostart: disable
Managed save: no
Security model: none
Security DOI: 0
