First-time kvm experience: Adjust the vm's vcpu, memory, disk size, and kvmvcpu

First-time kvm experience: Adjust the vm's vcpu, memory, disk size, and kvmvcpu

Assume that the vm created on the host is named vm1.

1.ViewVm1OfDomain information

[Root @ tanghuimin thm] # virsh dominfo vm1 Id: 10 Name: vm1 UUID: e2597379-5cc5-4ffa-0531-a073a81c5811 OS Type: hvm State: running CPU (s): 1 CPU time: 52.6 s Max memory: 1048576 KiB Used memory: 1048576 KiB Persistent: yes Autostart: disable Managed save: no Security model: selinux Security DOI: 0 Security label: system_u: system_r: s0000_t: s0: c790, c799 (enforcing)

2.ModifyVm1OfVcpu, memory

1) Modify vcpu and memory in real time

Virsh setvcpus vm1 xxx # The value cannot exceed the vcpu value configured in vm1.xml Virsh setmaxmem vm1 xxx # vm1 can be set successfully only when it is in the shutoff state. Virsh setmem vm1 xxx # The value cannot exceed maxmem

2) modify the vcpu and memory in the configuration file

Modify the vm1 configuration file

Virsh edit vm1

<Memory> corresponds to Maxmemory in dominfo

<CurrentMemory> corresponds to Usedmemory in dominfo

<Vcpu> CPU (s) in dominfo)

<Memory unit = 'kiib '> 1048576 </memory> <CurrentMemory unit = 'kiib '> 1048576 </currentMemory> <Vcpu placement = 'static '> 1 </vcpu>

Shutdown vm1 and then start it to take effect.

Virsh destroy vm1 Virsh start vm1

3.IsVm1Expand one10GOfDisk

Generate a 10 GB disk file/vm/vm1-add

Dd if =/dev/zero of =/vm/vm1-add bs = 1 M count = 10240

Modify the vm1 configuration file

Virsh edit vm1

The current disk file of vm1 is/vm/vm1.

<Disk type = 'file' device = 'disk'> <Driver name = 'qemu' type = 'raw 'cache = 'none'/> <Source file = '/vm/vm1'/> <Target dev = 'hda' bus = 'ide '/> <Address type = 'Drive 'controller = '0' bus = '0' target = '0' unit = '0'/> </Disk>

Append the following lines

<Disk type = 'file' device = 'disk'> <Driver name = 'qemu' type = 'raw 'cache = 'none'/> <Source file = '/vm/vm1-add'/> <Target dev = 'hdb' bus = 'ide '/> <Address type = 'Drive 'controller = '0' bus = '0' target = '0' unit = '1'/> </Disk>

Shutdown vm1 and then start it to take effect.

Virsh destroy vm1 Virsh start vm1

View the disk information of vm1

Root @ localhost ~] # Fdisk-l | grep Disk Disk/dev/sda: 2147 MB, 2147483648 bytes Disk identifier: 0x000e3e47 Disk/dev/sdb: 10.7 GB, 10737418240 bytes Disk identifier: 0x00000000 Disk/dev/mapper/VolGroup-lv_root: 1405 MB, 1405091840 bytes Disk identifier: 0x00000000 Disk/dev/mapper/VolGroup-lv_swap: 213 MB, 213909504 bytes Disk identifier: 0x00000000