AZURE

BlobLeaseIdMissing - Blob Lease ID Missing: Lease Required for Operation

Getting BlobLeaseIdMissing means your blob operation needs a lease ID in the x-ms-lease-id header, but you didn't provide one. Some operations (delete, update, metadata changes) require active leases to prevent concurrent modifications. Azure Storage returns this 409 client-side error when lease validation fails. Leases expire after their duration (typically 15-60 seconds, configurable). Most common when managing blobs for VM disk backups, but also surfaces in AKS container image updates, Azure SQL backup blob operations, and App Service application file updates.

#Common Causes

→Missing Lease ID Header: The request doesn't include the x-ms-lease-id header required for leased blob operations. Leased blob operations must include the lease ID in headers. This is persistent—you must acquire a lease and include the ID in the request.
→Expired Lease: The lease has passed its duration and is no longer active. Leases expire after their configured duration (typically 15-60 seconds). This is transient—acquiring a new lease and retrying helps.
→Lease Not Acquired: The operation requires a lease but none was acquired before the operation. Some operations (delete, update, metadata changes) require leases for leased blobs. This is persistent—you must acquire a lease before the operation.

✓Solutions

1Step 1: Diagnose - Check if the blob has an active lease. Azure CLI doesn't directly show lease status, but you can try operations to see if they fail with BlobLeaseIdMissing.
2Step 2: Fix - Acquire a blob lease before the operation. Use Azure Storage SDK (e.g., @azure/storage-blob) or REST API to acquire a lease. The lease ID must be included in subsequent request headers as x-ms-lease-id.
3Step 3: Fix - If lease expired, acquire a new lease. Leases expire after their duration, so you may need to renew or acquire a new lease before operations.
4Step 4: Fix - For operations on leased blobs, include the lease ID in request headers: x-ms-lease-id: <lease-id>. This applies to delete, update, and metadata change operations.
5Step 5: Fix - If you need to break an existing lease (force release), use the break lease operation. This is useful when the lease owner is unavailable.
6Step 6: Verify - After acquiring a lease and including the lease ID in headers, retry your operation. It should succeed instead of returning BlobLeaseIdMissing.

</>Code Examples

Blob Lease Status Check and Management

1# This script helps diagnose BlobLeaseIdMissing by checking blob lease status
2# Note: Azure CLI has limited lease support. Lease operations typically require REST API or SDKs.
3
4# Step 1: Set storage account details (replace with your values)
5STORAGE_ACCOUNT="mystorageaccount"
6CONTAINER_NAME="mycontainer"
7BLOB_NAME="myblob.txt"
8# Note: For production, use managed identity or SAS tokens instead of account key
9ACCOUNT_KEY="your-storage-account-key"
10
11# Step 2: Check blob properties (lease status may be visible in properties)
12echo "Checking blob properties for lease information..."
13az storage blob show \
14  --account-name ${STORAGE_ACCOUNT} \
15  --account-key ${ACCOUNT_KEY} \
16  --container-name ${CONTAINER_NAME} \
17  --name ${BLOB_NAME} \
18  --query "{Name:name,LeaseState:properties.leaseState,LeaseStatus:properties.leaseStatus,LeaseDuration:properties.leaseDuration}" \
19  --output table
20
21# Step 3: Try to get blob properties - if it fails with lease error, blob is leased
22echo "Testing blob access..."
23if az storage blob show \
24  --account-name ${STORAGE_ACCOUNT} \
25  --account-key ${ACCOUNT_KEY} \
26  --container-name ${CONTAINER_NAME} \
27  --name ${BLOB_NAME} \
28  --output table 2>&1; then
29  echo "Blob is accessible"
30else
31  ERROR_OUTPUT=$(az storage blob show \
32    --account-name ${STORAGE_ACCOUNT} \
33    --account-key ${ACCOUNT_KEY} \
34    --container-name ${CONTAINER_NAME} \
35    --name ${BLOB_NAME} \
36    --output table 2>&1)
37  
38  if echo "${ERROR_OUTPUT}" | grep -q "lease|LeaseIdMissing"; then
39    echo "WARNING: Blob appears to be leased or requires lease ID"
40  fi
41fi
42
43# Step 4: Instructions for acquiring lease using REST API
44echo ""
45echo "To acquire a blob lease, use Azure Storage REST API or SDK:"
46echo ""
47echo "REST API Example (PUT request):"
48echo "  PUT https://${STORAGE_ACCOUNT}.blob.core.windows.net/${CONTAINER_NAME}/${BLOB_NAME}?comp=lease"
49echo "  Headers:"
50echo "    x-ms-lease-action: acquire"
51echo "    x-ms-lease-duration: 60"
52echo "    x-ms-version: 2021-04-10"
53echo "    Authorization: SharedKey ..."
54echo ""
55echo "The response will include x-ms-lease-id header with the lease ID."
56
57# Step 5: Instructions for using lease ID in operations
58echo ""
59echo "To use lease ID in blob operations:"
60echo "  Include header: x-ms-lease-id: <lease-id>"
61echo ""
62echo "Example operations requiring lease ID:"
63echo "  - Delete blob"
64echo "  - Update blob metadata"
65echo "  - Update blob properties"
66echo "  - Snapshot blob (if leased)"
67
68# Step 6: Instructions for breaking lease
69echo ""
70echo "To break an existing lease (force release):"
71echo "  PUT https://${STORAGE_ACCOUNT}.blob.core.windows.net/${CONTAINER_NAME}/${BLOB_NAME}?comp=lease"
72echo "  Headers:"
73echo "    x-ms-lease-action: break"
74echo "    x-ms-version: 2021-04-10"
75echo "    Authorization: SharedKey ..."
76
77# Step 7: Note about Azure Storage SDK
78echo ""
79echo "For easier lease management, use Azure Storage SDK:"
80echo "  - JavaScript/TypeScript: @azure/storage-blob"
81echo "  - Python: azure-storage-blob"
82echo "  - .NET: Azure.Storage.Blobs"
83echo "  - Java: azure-storage-blob"

↗Related Errors

PreconditionFailed ConflictError

Provider Information

This error code is specific to AZURE services. For more information, refer to the official AZURE documentation.