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This article is about how to fix nova's back-end image files and hang ceph to generate virtual machine files that are 1024 times larger than bug. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The front-end interface generates virtual machines:

1. Start with the create_image function of the RBD class of nova/virt/libvirt/imagebackend.py.

Attach the source code:

Def create_image (self, prepare_template, base, size, * args, * * kwargs):

Import pydevd

Pydevd.settrace ('192.168.10.10, port=51234, stdoutToServer=True, stderrToServer=True)

If self.rbd is None:

Raise RuntimeError (_ 'rbd python libraries not found')

If not os.path.exists (base): # check whether the path exists

Prepare_template (target=base, max_size=size, * args, * * kwargs)

Else:

Self.verify_base_size (base, size) # verifies whether the size meets the requirements, which is consistent with the previous blog local file creation analysis.

# keep using the command line import instead of librbd since it

# detects zeroes to preserve sparseness in the image

Args = ['--pool', self.pool, base, self.rbd_name] # construct virtual machine file generation parameters

If self._supports_layering ():

Args + = ['--new-format']

Args + = self._ceph_args ()

Libvirt_utils.import_rbd_image (* args) # according to 1.1

Base_size = disk.get_disk_size (base) # find the size of the base image template file

If size and size > base_size: # see figure 1-1:

Self._resize (self.rbd_name, size) # follow up to 1.2

1.1:

('rbd'' import''--pool', 'nova',' / var/lib/nova/instances/_base/8b925177989924ee3e316b28b3abc03a829fbb29', 'fec8e16e-0055-4117 Afbd845773f2 id',' admin','--conf','/ etc/ceph/ceph.conf')

Before executing this command:

After executing the command:

Rbd info:

Figure 1-1:

Where size is the falvor parameter 1G passed by the page. That is, (1024 "1024" 1024), and base_size is the cirros_ceph size of the image file.

1.2:

Def _ resize (self, volume_name, size):

Size = int (size) * units.Ki # see figure 1.2-1

With RBDVolumeProxy (self, volume_name) as vol:

Vol.resize (size) # according to

Figure 1.2-1:

1.3:

I wonder here that I can't find the resize function after that (I'll have time to study it later, so I'll focus on solving the problem first. )

After executing this command:

It was found that size was 1024GB, which was 1024 times higher than expected.

Fix bug:

In figure 1.2-1

Size = int (size) * units.Ki

Block out:

Experiment again:

Problem solved.

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