Add VM snapshot send (initial)
This commit is contained in:
@@ -3119,3 +3119,418 @@ def vm_worker_import_snapshot(
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current=current_stage,
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total=total_stages,
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)
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def vm_worker_send_snapshot(
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zkhandler,
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celery,
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domain,
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snapshot_name,
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destination_api_uri,
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destination_api_key,
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destination_api_verify_ssl=True,
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incremental_parent=None,
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destination_storage_pool=None,
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):
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import requests
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import rados
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import rbd
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from packaging.version import parse as parse_version
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current_stage = 0
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total_stages = 1
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start(
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celery,
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f"Sending snapshot '{snapshot_name}' of VM '{domain}' to remote cluster '{destination_api_uri}'",
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current=current_stage,
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total=total_stages,
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)
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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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fail(
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celery,
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f"Could not find VM '{domain}' in the cluster",
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)
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return False
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# Get our side's VM configuration details
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vm_detail = get_list(zkhandler, limit=dom_uuid, is_fuzzy=False)[1][0]
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if not isinstance(vm_detail, dict):
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fail(
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celery,
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f"VM listing returned invalid data: {vm_detail}",
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)
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return False
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# Check if the 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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fail(
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celery,
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f"Could not find snapshot '{snapshot_name}' of VM '{domain}'",
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)
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return False
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# Check if the incremental parent exists
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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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fail(
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celery,
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f"Could not find snapshot '{snapshot_name}' of VM '{domain}'",
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)
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return False
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# Validate that the destination cluster can be reached
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destination_api_timeout = (3.05, 172800)
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destination_api_headers = {
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"X-Api-Key": destination_api_key,
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"Content-Type": "application/octet-stream",
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}
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try:
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# Hit the API root; this should return "PVC API version x"
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response = requests.get(
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f"{destination_api_uri}/",
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timeout=destination_api_timeout,
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headers=None,
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params=None,
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data=None,
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verify=destination_api_verify_ssl,
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)
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if "PVC API" not in response.json().get("message"):
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raise ValueError("Remote API is not a PVC API or incorrect URI given")
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except requests.exceptions.ConnectionError as e:
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fail(
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celery,
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f"Connection to remote API timed out: {e}",
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)
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return False
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except ValueError as e:
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fail(
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celery,
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f"Connection to remote API is not valid: {e}",
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)
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return False
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except Exception as e:
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fail(
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celery,
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f"Connection to remote API failed: {e}",
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)
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return False
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# Hit the API "/status" endpoint to validate API key and cluster status
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response = requests.get(
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f"{destination_api_uri}/status",
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timeout=destination_api_timeout,
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headers=destination_api_headers,
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params=None,
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data=None,
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verify=destination_api_verify_ssl,
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)
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destination_cluster_status = response.json()
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current_destination_pvc_version = destination_cluster_status.get(
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"pvc_version", None
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)
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if current_destination_pvc_version is None:
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fail(
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celery,
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"Connection to remote API failed: no PVC version information returned",
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)
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return False
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expected_destination_pvc_version = "0.9.100" # TODO: 0.9.101 when completed
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# Work around development versions
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current_destination_pvc_version = re.sub(
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r"~git-.*", "", current_destination_pvc_version
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)
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# Compare versions
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if parse_version(current_destination_pvc_version) < parse_version(
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expected_destination_pvc_version
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):
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fail(
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celery,
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f"Remote PVC cluster is too old: requires version {expected_destination_pvc_version} or higher",
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)
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return False
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# Check if the VM already exists on the remote
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response = requests.get(
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f"{destination_api_uri}/vm/{domain}",
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timeout=destination_api_timeout,
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headers=destination_api_headers,
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params=None,
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data=None,
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verify=destination_api_verify_ssl,
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)
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destination_vm_status = response.json()
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current_destination_vm_state = destination_vm_status.get("state", None)
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if (
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current_destination_vm_state is not None
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and current_destination_vm_state != "mirror"
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):
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fail(
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celery,
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"Remote PVC VM exists and is not a mirror",
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)
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return False
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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_rbdsnaps = snapshot_rbdsnaps.split(",")
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# Get details about remote VM snapshots
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destination_vm_snapshots = destination_vm_status.get("snapshots", [])
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# Check if this snapshot is in the remote list already
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if snapshot_name in [s["name"] for s in destination_vm_snapshots]:
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fail(
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celery,
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f"Snapshot {snapshot_name} already exists on the target",
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)
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return False
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# Check if this snapshot is older than the latest remote VM snapshot
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if (
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len(destination_vm_snapshots) > 0
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and snapshot_timestamp < destination_vm_snapshots[0]["timestamp"]
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):
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fail(
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celery,
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f"Target has a newer snapshot ({destination_vm_snapshots[0]['name']}); cannot send old snapshot {snapshot_name}",
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)
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return False
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# Check that our incremental parent exists on the remote VM
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if incremental_parent is not None:
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if incremental_parent not in [s["name"] for s in destination_vm_snapshots]:
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fail(
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celery,
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f"Can not send incremental for a snapshot ({incremental_parent}) which does not exist on the target",
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)
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return False
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# Begin send, set stages
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total_stages = (
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2
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+ (2 * len(snapshot_rbdsnaps))
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+ (len(snapshot_rbdsnaps) if current_destination_vm_state is None else 0)
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)
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# Create the block devices on the remote side if this is a new VM send
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for rbd_detail in [r for r in vm_detail["disks"] if r["type"] == "rbd"]:
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rbd_name = rbd_detail["name"]
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pool, volume = rbd_name.split("/")
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current_stage += 1
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update(
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celery,
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f"Preparing remote volume for {rbd_name}@{snapshot_name}",
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current=current_stage,
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total=total_stages,
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)
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# Get the storage volume details
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retcode, retdata = ceph.get_list_volume(zkhandler, pool, volume, is_fuzzy=False)
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if not retcode or len(retdata) != 1:
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if len(retdata) < 1:
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error_message = f"No detail returned for volume {rbd_name}"
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elif len(retdata) > 1:
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error_message = f"Multiple details returned for volume {rbd_name}"
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else:
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error_message = f"Error getting details for volume {rbd_name}"
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fail(
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celery,
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error_message,
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)
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return False
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try:
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size_bytes = ceph.format_bytes_fromhuman(retdata[0]["stats"]["size"])
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except Exception as e:
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error_message = f"Failed to get volume size for {rbd_name}: {e}"
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if destination_storage_pool is not None:
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pool = destination_storage_pool
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if current_destination_vm_state is None:
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current_stage += 1
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update(
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celery,
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f"Creating remote volume {pool}/{volume} for {rbd_name}@{snapshot_name}",
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current=current_stage,
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total=total_stages,
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)
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# Check if the volume exists on the target
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response = requests.get(
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f"{destination_api_uri}/storage/ceph/volume/{pool}/{volume}",
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timeout=destination_api_timeout,
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headers=destination_api_headers,
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params=None,
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data=None,
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verify=destination_api_verify_ssl,
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)
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if response.status_code != 404:
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fail(
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celery,
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f"Remote storage pool {pool} already contains volume {volume}",
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)
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return False
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# Create the volume on the target
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params = {
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"size": size_bytes,
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}
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response = requests.post(
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f"{destination_api_uri}/storage/ceph/volume/{pool}/{volume}",
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timeout=destination_api_timeout,
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headers=destination_api_headers,
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params=params,
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data=None,
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verify=destination_api_verify_ssl,
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)
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destination_volume_create_status = response.json()
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if response.status_code != 200:
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fail(
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celery,
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f"Failed to create volume {rbd_name} on target: {destination_volume_create_status['message']}",
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)
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return False
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# Send the volume to the remote
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cluster = rados.Rados(conffile="/etc/ceph/ceph.conf")
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cluster.connect()
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ioctx = cluster.open_ioctx(pool)
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image = rbd.Image(ioctx, name=volume, snapshot=snapshot_name, read_only=True)
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size = image.size()
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chunk_size_mb = 128
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if incremental_parent is not None:
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# Diff between incremental_parent and snapshot
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celery_message = f"Sending diff between {incremental_parent} and {snapshot_name} for {rbd_name}"
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def diff_chunker():
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def diff_cb(offset, length, exists):
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"""Callback to handle diff regions"""
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if exists:
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data = image.read(offset, length)
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yield (
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offset.to_bytes(8, "big") + length.to_bytes(8, "big") + data
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)
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image.set_snap(incremental_parent)
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image.diff_iterate(0, size, incremental_parent, diff_cb)
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data_stream = diff_chunker()
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else:
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# Full image transfer
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celery_message = f"Sending full image of {rbd_name}@{snapshot_name}"
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def chunker():
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chunk_size = 1024 * 1024 * chunk_size_mb
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current_chunk = 0
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last_chunk_time = time.time()
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while current_chunk < size:
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chunk = image.read(current_chunk, chunk_size)
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yield chunk
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current_chunk += chunk_size
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current_chunk_time = time.time()
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chunk_time = current_chunk_time - last_chunk_time
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last_chunk_time = current_chunk_time
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chunk_speed = round(chunk_size_mb / chunk_time, 1)
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update(
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celery,
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celery_message + f" ({chunk_speed} MB/s)",
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current=current_stage,
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total=total_stages,
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)
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data_stream = chunker()
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current_stage += 1
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update(
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celery,
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celery_message,
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current=current_stage,
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total=total_stages,
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)
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send_params = {
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"pool": pool,
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"volume": volume,
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"snapshot": snapshot_name,
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"size": size,
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"source_snapshot": incremental_parent,
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}
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send_headers = {
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"X-Api-Key": destination_api_key,
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"Content-Type": "application/octet-stream",
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"Transfer-Encoding": None, # Disable chunked transfer encoding
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}
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try:
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response = requests.post(
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f"{destination_api_uri}/storage/ceph/volume/{pool}/{volume}",
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timeout=destination_api_timeout,
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headers=send_headers,
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params=send_params,
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data=data_stream,
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verify=destination_api_verify_ssl,
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)
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response.raise_for_status()
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except Exception as e:
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fail(
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celery,
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f"Failed to send snapshot: {e}",
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)
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return False
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finally:
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image.close()
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ioctx.close()
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cluster.shutdown()
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# Send the VM configuration
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# if current_destination_vm_state is None:
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# This is a new VM, so define it
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# response = requests.post()
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# else:
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# This is a modification
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# response = requests.post()
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