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While writing code that automatically chooses and migrates virtual machines using python 3.5 and libvirt. I got it working one way, but returning a guest to it's previous host fails (as of now I only have 2 hosts, but it should change in the future).

What I did:

  1. Migrated a guest G from host SRC to Host DST.

    • Got the capacity of the source image on SRC using conn.storagePoolLookupByName('default') stgvol = pool.storageVolLookupByName(stgvolname).info()[1]
    • Created a destination image on DST:subprocess.run(['qemu-img', 'create', '-f', 'qcow2', vm_image_path, size_str])
    • Migrated the guest from SRC to DST: dom = conn.lookupByName(domain_name) new_dom = dom.migrate(dest_conn, libvirt.VIR_MIGRATE_LIVE, None, None, 0)

  2. Tried to migrate guest G back from B to A using the same steps in (1.) But got libvirt.libvirtError: Storage volume not found: no storage vol with matching name 'guest-name' on the line with storageVolLookupByName.

So it seems the image is not registering in the default pool during migration. Any thought on why this might be, or what can I do to fix it?

techniblob
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