假设host上创建的vm的名字为vm1。
1. 查看vm1的domain information
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[[email protected] thm]# virsh dominfo vm1 Id: 10 Name: vm1 UUID: e2597379-5cc5-4ffa-0531-a073a81c5811 OS Type: hvm State: running CPU(s): 1 CPU time: 52.6s 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:svirt_t:s0:c790,c799 (enforcing) |
2. 修改vm1的vcpu,
memory
1）实时修改vcpu，memory
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virsh setvcpus vm1 xxx #数值不能超过vm1.xml中配置的vcpu值 virsh setmaxmem vm1 xxx #vm1处于shut virsh setmem vm1 xxx #数值不能超过maxmem |
2）配置文件修改vcpu,
memory
修改vm1的配置文件
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virsh edit vm1 |
<memory>对应dominfo中的Max
memory
<currentMemory>对应dominfo中的Used
memory
<vcpu>对应dominfo中的CPU(s)
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<memory unit=‘KiB‘>1048576</memory> <currentMemory unit=‘KiB‘>1048576</currentMemory> <vcpu placement=‘static‘>1</vcpu> |
将vm1先关机再启动即可生效
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virsh destroy vm1 virsh start vm1 |
3. 为vm1扩展一个10G的disk
生成一个大小为10G的磁盘文件/vm/vm1-add
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dd if=/dev/zero of=/vm/vm1-add bs=1M count=10240 |
修改vm1的配置文件
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virsh edit vm1 |
vm1现有的磁盘文件为/vm/vm1
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<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‘ </disk> |
在后面追加如下几行
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<disk type=‘file‘ device=‘disk‘> <driver name=‘qemu‘ type=‘raw‘ cache=‘none‘/> <source file=‘/vm/vm1-add‘/> <target dev=‘hdb‘ <address type=‘drive‘ controller=‘0‘ bus=‘0‘ </disk> |
将vm1先关机再启动即可生效
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virsh destroy vm1 virsh start vm1 |
查看vm1的磁盘信息
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[email protected] ~]# fdisk -l| grep Disk Disk /dev/sda: 2147 MB, 2147483648 bytes Disk identifier: 0x000e3e47 Disk /dev/sdb: 10.7 GB, 10737418240 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 |