009.KVM配置调整

  1 [root@kvm-host ~]# virsh shutdown  vm01-centos6.8
  2 [root@kvm-host ~]# virsh edit vm01-centos6.8
  3 ……
  4   <memory unit=‘KiB‘>4194304</memory>
  5   <currentMemory unit=‘KiB‘>4194304</currentMemory>		#修改当前内存
  6   <vcpu placement=‘static‘>4</vcpu>				#修改当前CPU数
  7 ……
  8 [root@kvm-host ~]# virsh create /etc/libvirt/qemu/vm01-centos6.8.xml
  9 #从配置文件加载启动虚机。
 10 [root@kvm-host ~]# virsh dominfo vm01-centos6.8		#查看最大内存

  1 virsh setmaxmem vm01-centos6.8 4G				#需要关闭此虚机
  2 虚机内存调整
  3 virsh setmem UAKVM2 2G --config					#关机状态下调整
  4 virsh setmem UAKVM2 2G						#开机状态下调整

  1 [root@kvm-host ~]# virsh edit vm01-centos6.8
  2     <disk type=‘file‘ device=‘disk‘>
  3       <driver name=‘qemu‘ type=‘qcow2‘/>
  4       <source file=‘/data/images/vm01-centos6.8.img‘/>		#磁盘路径
  5       <target dev=‘vda‘ bus=‘virtio‘/>
  6       <address type=‘pci‘ domain=‘0x0000‘ bus=‘0x00‘ slot=‘0x04‘ function=‘0x0‘/>
  7     </disk>
  8 [root@kvm-host ~]# qemu-img info /data/images/vm01-centos6.8.img

  1 [root@kvm-host ~]# virsh edit vm01-centos6.8
  2     <disk type=‘file‘ device=‘disk‘>
  3       <driver name=‘qemu‘ type=‘qcow2‘/>
  4       <source file=‘/data/images/vm01-centos6.8.img‘/>		#磁盘路径
  5       <target dev=‘vda‘ bus=‘virtio‘/>
  6       <address type=‘pci‘ domain=‘0x0000‘ bus=‘0x00‘ slot=‘0x04‘ function=‘0x0‘/>
  7     </disk>
  8 [root@kvm-host ~]# qemu-img info /data/images/vm01-centos6.8.img

  1 [root@kvm-host ~]# virsh console 2

  1 [root@localhost ~]# vgcreate -s 16m vg01 /dev/vdb1
  2 [root@localhost ~]# lvcreate -L 1g -n lv01 vg01
  3 [root@localhost ~]# mkfs.ext4 /dev/vg01/lv01
  4 [root@localhost ~]# mkdir /data
  5 [root@localhost ~]# mount /dev/vg01/lv01 /data/

  1 [root@kvm-host ~]# virsh edit vm01-centos6.8
  2     <disk type=‘file‘ device=‘disk‘>
  3       <driver name=‘qemu‘ type=‘qcow2‘/>
  4       <source file=‘/data/images/vm01-centos6.8.img‘/>		#磁盘路径
  5       <target dev=‘vda‘ bus=‘virtio‘/>
  6       <address type=‘pci‘ domain=‘0x0000‘ bus=‘0x00‘ slot=‘0x04‘ function=‘0x0‘/>
  7     </disk>
  8 [root@kvm-host ~]# qemu-img info /data/images/vm01-centos6.8.img

  1 [root@kvm-host ~]# qemu-img resize /data/images/vm01-centos6.8.img +1G

  1 [root@kvm-host ~]# qemu-img info /data/images/vm01-centos6.8.img

  1 [root@kvm-host ~]# virsh start vm01-centos6.8
  2 [root@localhost ~]# fdisk -l

  1 [root@localhost ~]# fdisk /dev/vda
  2 ……
  3 Command (m for help): p

  1 Command (m for help): d
  2 Partition number (1-4): 3
  3 Command (m for help): n
  4 p
  5 Partition number (1-4): 3

  1 Command (m for help): w

  1 [root@kvm-host ~]# resize2fs /dev/vda3
  2 [root@kvm-host ~]# shutdown -r now

  1 [root@kvm-host ~]# dd if=/dev/zero bs=1024M count=2 > /data/images/vm01-centos6.8-02.img
  2 [root@kvm-host ~]# qemu-img info /data/images/vm01-centos6.8-02.img

  1 [root@kvm-host ~]# qemu-img create -f qcow2 /data/images/vm01-centos6.8-02.img 1G
  2 [root@kvm-host ~]# virsh attach-disk vm01-centos6.8 /data/images/vm01-centos6.8-02.img vdb --cache=none --subdriver=qcow2
  3 [root@kvm-host ~]# virsh domblklist vm01-centos6.8