KVM主机动态更改cpu数量和内存大小

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


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


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

KVM主机动态更改cpu数量和内存大小

   
KVM主机动态更改cpu数量和内存大小

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










本文转自 bbotte 51CTO博客,原文链接:http://blog.51cto.com/bbotte/1635733,如需转载请自行联系原作者
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