KVM Virtual machines also support the online expansion of the disk capabilities, online expansion has a specific use of the environment, mainly used in the production environment can not be stopped casually, this article takes Hadoop as an example of the following steps:
1. View existing disks
[[email protected] test]# virsh list --all id name state---------------------------------------------------- 1 win7 running 17 hadoop1 running 18 hadoop4 running 20 hadoop2 running - hadoop3 shut off[[email protected] test]# virsh domblklist hadoop1Target Source------------------------------------------------vda / images/test/hadoop1.qcow2hdc -
2, create a piece of qcow2 virtual disk
[Email protected] test]# qemu-img create-f qcow2 hadoop1_add01.qcow2 5GFormatting ' hadoop1_add01.qcow2 ', fmt=qcow2 size =5368709120 Encryption=off cluster_size=65536 [[email protected] test]#
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[[email protected] test]# virsh attach-disk hadoop1 /images/test/hadoop1_add01.qcow2 vdb --cache=none --subdriver=qcow2 Disk attached successfully[[email protected] test]# virsh domblklist hadoop1 Target source------------------------------------------------vda /images/test/hadoop1.qcow2vdb /images/test/ hadoop1_add01.qcow2hdc -
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5, then enter the system inside the partition area
Fdisk/dev/vdb
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6, the Division of Logical Volume LVM omitted, the front can be referenced.
7. Modify the virtual machine configuration file to write the new disk configuration to the virtual machine disk configuration
(1) View the disk configuration of the current virtual machine HADOOP1
[[email protected] test]# virsh dumpxml hadoop1<domain type= ' Qemu ' id= ' "> <name>hadoop1</name> <uuid> 919f0921-0736-ad5b-780b-a440de2f35cb</uuid> <memory unit= ' KiB ' >524288</memory > <currentmemory unit= ' KiB ' >524288</currentMemory> <vcpu placement= ' static ' >1</vcpu> <os> <type arch= ' x86_64 ' machine= ' rhel6.6.0 ' >hvm</type> <boot dev= ' HD '/> </os> <features> <acpi/> <apic/ > <pae/> </features> <clock offset= ' UTC '/ > <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_ Reboot> <on_crash>restart</on_crash&gT; <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type= ' file ' device= ' disk ' > <driver name= ' qemu ' type= ' qcow2 ' cache= ' None '/> < Source file= '/images/test/hadoop1.qcow2 '/> <target dev= ' VDA ' bus= ' virtio '/> <alias name= ' Virtio-disk0 '/> <address type= ' PCI ' domain= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x05 ' function= ' 0x0 '/> </disk> <disk type= ' File ' device= ' disk ' > <driver name= ' qemu ' type= ' qcow2 ' cache= ' None '/> <source file= '/images/test/hadoop1_ Add01.qcow2 '/> <target dev= ' vdb ' bus= ' virtio '/> < Alias name= ' Virtio-disk1 '/> <address type= ' PCI ' domain = ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x07 ' function= ' 0x0 '/> </disk> <disk type= ' block ' device= ' cdrom ' > < Driver name= ' qemu ' type= ' raw '/> <target dev= ' hdc ' bus= ' IDE '/> <readonly/> <alias name= ' ide0-1-0 '/> <address type= ' drive ' Controller= ' 0 ' bus= ' 1 ' target= ' 0 ' unit= ' 0 '/> </disk> <controller type= ' USB ' index= ' 0 ' model= ' ich9-ehci1 ' > <alias&nbsP;name= ' usb0 '/> <address type= ' PCI ' domain= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x04 ' function= ' 0x7 '/> </controller> <controller type= ' USB ' index= ' 0 ' model= ' ich9-uhci1 ' > <alias name= ' usb0 '/> <master startport= ' 0 '/ > <address type= ' PCI ' domain= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x04 ' function= ' 0x0 ' multifunction= ' on '/> </controller> <controller type= ' USB ' index= ' 0 ' model= ' ich9-uhci2 ' > <alias name= ' usb0 '/> <master startport = ' 2 '/> <address type= ' PCI ' domain= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x04 ' &NBsp;function= ' 0x1 '/> </controller> <controller Type= ' USB ' index= ' 0 ' model= ' ich9-uhci3 ' > <alias name= ' Usb0 '/> <master startport= ' 4 '/> <address type= ' PCI ' domain= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x04 ' function= ' 0x2 '/ > </controller> <controller type= ' IDE ' index= ' 0 ' > <alias name= ' ide0 '/> <address type= ' PCI ' domain= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x01 ' function= ' 0x1 '/ > </controller> <interface type= ' Bridge ' > <mac address= ' 52:54:00:b6:bf:1f '/> <source&nbsP;bridge= ' br0 '/> <target dev= ' Vnet1 '/> <model type= ' virtio '/> <alias name= ' Net0 '/> <address type= ' PCI ' domain= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x03 ' function= ' 0x0 '/> </interface> <serial type= ' pty ' > <source path= '/DEV/PTS/2 '/> <target port= ' 0 '/> <alias Name= ' serial0 '/> </serial> <console type= ' Pty ' tty= '/dev/pts/2 ' > <source path= '/DEV/PTS/2 '/> <target type= ' serial ' port= ' 0 '/> <alias name=' Serial0 '/> </console> <input type= ' mouse ' bus= ' ps2 '/> <graphics type= ' vnc ' port= ' 5911 ' autoport= ' no ' listen= ' 0.0.0.0 ' > <listen type= ' address ' address= ' 0.0.0.0 '/> </graphics> <video> <model type= ' Cirrus ' vram= ' 9216 ' heads= ' 1 '/> <alias name= ' Video0 '/> <address type= ' PCI ' domain= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x02 ' function= ' 0x0 '/> </ Video> <memballoon model= ' Virtio ' > <alias name= ' Balloon0 '/> <address type= ' PCI ' domain = ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x06 ' function= ' 0x0 '/> </memballoon> </devices> </domain>
(2) Add the following configuration to the/etc/libvirt/qemu/hadoop1.xml configuration file
<disk type= ' file ' device= ' disk ' > <driver name= ' qemu ' type= ' qcow2 ' cache= ' None '/> <source file= '/I Mages/test/hadoop1_add01.qcow2 '/> <target dev= ' vdb ' bus= ' virtio '/> <alias name= ' Virtio-disk1 '/> <address type= ' PCI ' domain= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x07 ' function= ' 0x0 '/> </disk>
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When all the configuration files are written to the virtual machine configuration information, the prompt restart can also take effect.
This article is from the "Breght Moon" blog, make sure to keep this source http://liqingbiao.blog.51cto.com/3044896/1741252
KVM Virtualization Notes (11)------KVM Linux virtual machine online expansion disk