Add initial implementation of snapshot export
This commit is contained in:
@ -1459,6 +1459,224 @@ def rollback_vm_snapshot(zkhandler, domain, snapshot_name):
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)
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def export_vm_snapshot(
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zkhandler, domain, snapshot_name, export_path, incremental_parent=None
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):
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# 0b. Validations part 1
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# Validate that the target path is valid
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if not re.match(r"^/", export_path):
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return (
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False,
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f"ERROR: Target path {export_path} is not a valid absolute path on the primary coordinator!",
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)
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# Ensure that backup_path (on this node) exists
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if not os.path.isdir(export_path):
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return (
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False,
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f"ERROR: Target path {export_path} does not exist!",
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)
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# 1a. Create destination directory
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export_target_root = f"{export_path}/{domain}"
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export_target_path = f"{export_path}/{domain}/{snapshot_name}/images"
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if not os.path.isdir(export_target_path):
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try:
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os.makedirs(export_target_path)
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except Exception as e:
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return (
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False,
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f"ERROR: Failed to create target directory {export_target_path}: {e}",
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)
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tstart = time.time()
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export_type = "incremental" if incremental_parent is not None else "full"
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# 1b. Prepare export JSON writer (it will write on any result)
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def write_export_json(
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result=False,
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result_message="",
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vm_configuration=None,
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export_files=None,
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export_files_size=0,
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ttot=None,
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):
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if ttot is None:
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tend = time.time()
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ttot = round(tend - tstart, 2)
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export_details = {
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"type": export_type,
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"snapshot_name": snapshot_name,
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"incremental_parent": incremental_parent,
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"result": result,
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"result_message": result_message,
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"runtime_secs": ttot,
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"vm_configuration": vm_configuration,
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"export_files": export_files,
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"export_size_bytes": export_files_size,
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}
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with open(f"{export_target_root}/{snapshot_name}/snapshot.json", "w") as fh:
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jdump(export_details, fh)
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# 2. Validations part 2
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# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
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error_message = f'Could not find VM "{domain}" in the cluster!'
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write_export_json(result=False, result_message=f"ERROR: {error_message}")
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return False, f"ERROR: {error_message}"
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# Validate that the given snapshot exists
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if not zkhandler.exists(
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("domain.snapshots", dom_uuid, "domain_snapshot.name", snapshot_name)
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):
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error_message = (
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f'ERROR: Could not find snapshot "{snapshot_name}" of VM "{domain}"!',
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)
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write_export_json(result=False, result_message=f"ERROR: {error_message}")
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return False, f"ERROR: {error_message}"
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if incremental_parent is not None and not zkhandler.exists(
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("domain.snapshots", dom_uuid, "domain_snapshot.name", incremental_parent)
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):
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error_message = (
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f'ERROR: Could not find snapshot "{snapshot_name}" of VM "{domain}"!',
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)
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write_export_json(result=False, result_message=f"ERROR: {error_message}")
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return False, f"ERROR: {error_message}"
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# Get details about VM snapshot
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_, snapshot_timestamp, snapshot_xml, snapshot_rbdsnaps = zkhandler.read_many(
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[
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(
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(
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"domain.snapshots",
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dom_uuid,
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"domain_snapshot.name",
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snapshot_name,
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)
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),
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(
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(
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"domain.snapshots",
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dom_uuid,
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"domain_snapshot.timestamp",
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snapshot_name,
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)
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),
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(
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(
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"domain.snapshots",
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dom_uuid,
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"domain_snapshot.xml",
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snapshot_name,
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)
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),
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(
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(
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"domain.snapshots",
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dom_uuid,
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"domain_snapshot.rbd_snapshots",
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snapshot_name,
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)
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),
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]
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)
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snapshot_volumes = list()
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for rbdsnap in snapshot_rbdsnaps.split(","):
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pool, _volume = rbdsnap.split("/")
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volume, name = _volume.split("@")
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ret, snapshots = ceph.get_list_snapshot(
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zkhandler, pool, volume, limit=name, is_fuzzy=False
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)
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if ret:
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snapshot_volumes += snapshots
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# 4b. Validate that, if an incremental_parent is given, it is valid
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# The incremental parent is just a datestring
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if incremental_parent is not None:
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export_fileext = "rbddiff"
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else:
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export_fileext = "rbdimg"
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# 6. Dump snapshot to folder with `rbd export` (full) or `rbd export-diff` (incremental)
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is_snapshot_export_failed = False
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which_snapshot_export_failed = list()
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export_files = list()
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for snapshot_volume in snapshot_volumes:
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pool = snapshot_volume["pool"]
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volume = snapshot_volume["volume"]
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snapshot_name = snapshot_volume["snapshot"]
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size = snapshot_volume["stats"]["size"]
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if incremental_parent is not None:
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retcode, stdout, stderr = common.run_os_command(
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f"rbd export-diff --from-snap {incremental_parent} {pool}/{volume}@{snapshot_name} {export_target_path}/{pool}.{volume}.{export_fileext}"
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)
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if retcode:
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is_snapshot_export_failed = True
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which_snapshot_export_failed.append(f"{pool}/{volume}")
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else:
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export_files.append((f"images/{pool}.{volume}.{export_fileext}", size))
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else:
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retcode, stdout, stderr = common.run_os_command(
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f"rbd export --export-format 2 {pool}/{volume}@{snapshot_name} {export_target_path}/{pool}.{volume}.{export_fileext}"
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)
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if retcode:
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is_snapshot_export_failed = True
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which_snapshot_export_failed.append(f"{pool}/{volume}")
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else:
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export_files.append((f"images/{pool}.{volume}.{export_fileext}", size))
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def get_dir_size(path):
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total = 0
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with scandir(path) as it:
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for entry in it:
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if entry.is_file():
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total += entry.stat().st_size
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elif entry.is_dir():
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total += get_dir_size(entry.path)
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return total
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export_files_size = get_dir_size(export_target_path)
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if is_snapshot_export_failed:
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error_message = f'Failed to export snapshot for volume(s) {", ".join(which_snapshot_export_failed)}'
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write_export_json(
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result=False,
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result_message=f"ERROR: {error_message}",
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vm_configuration=snapshot_xml,
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export_files=export_files,
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export_files_size=export_files_size,
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)
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return (
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False,
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f"ERROR: {error_message}",
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)
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tend = time.time()
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ttot = round(tend - tstart, 2)
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retlines = list()
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myhostname = gethostname().split(".")[0]
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result_message = f"Successfully exported VM '{domain}' snapshot '{snapshot_name}' ({export_type}) to '{myhostname}:{export_path}' in {ttot}s."
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retlines.append(result_message)
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write_export_json(
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result=True,
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result_message=result_message,
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vm_configuration=snapshot_xml,
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export_files=export_files,
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export_files_size=export_files_size,
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ttot=ttot,
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)
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return True, "\n".join(retlines)
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#
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# VM Backup Tasks
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#
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