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Sysadmin/Migrate virtual machine (view source)

Revision as of 11:24, 16 August 2010

900 bytes added , 11:24, 16 August 2010

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== How to migrate a file-based guest to LVM (online method) ==

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=== How to migrate a file-based guest to LVM (online method) ===

* First, create the logical volume and attach it to the running VM:

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#treehouse virsh start lightwave --console

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== How to migrate a file-based guest to LVM (offline method) ==

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=== How to migrate a file-based guest to LVM (offline method) ===

* Determine the offset of the root partition within the raw disk image:

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* Then create an LV and copy over everything as in the online case

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== How to migrate an LVM-based guest to another host ==

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=== How to migrate an LVM-based guest to another host ===

(untested procedure)

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Make sure you pass all the fancy switches to rsync or you'll loose

information on the copy.

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=== Alternative to convert file based VM to block based LVM (Assumes server is treehouse) ===

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Stop the VM

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sudo virsh stop ''name_of_vm''

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Convert the qcow2 file to a raw file

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sudo qemu-img convert "name_of_vm".qcow2 -O raw "name_of_vm".raw

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Create the LVM - Make sure the "size_of_vm" is equal or greater than the size of your raw image

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sudo virsh vol-create-as treehouse "name_of_vm" "size_of_vm"

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Copy the raw image to the LVM

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sudo dd if="name_of_vm".raw of=/dev/treehouse/"name_of_vm" bs=1M

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Edit the VM configuration

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sudo virsh edit "name_of_vm"

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...

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<disk type='block' device='disk'> <----- change disk type to block

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<source dev='/dev/treehouse/"name_of_vm"'/> <------ note that the source is now dev= and not file=

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</disk>

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...

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</devices>

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Now start your VM and your all set

Smparrish

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