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Azure BlobStorage

Package Name NuGet Description
NLog.Extensions.AzureBlobStorage NuGet Azure Blob Storage

Blob Configuration

Syntax

<extensions>
  <add assembly="NLog.Extensions.AzureBlobStorage" /> 
</extensions>

<targets>
  <target xsi:type="AzureBlobStorage"
          name="String"
          layout="Layout"
          connectionString="Layout"
          blobName="Layout"
          container="Layout">
            <metadata name="mymeta" layout="mymetavalue" />   <!-- Multiple allowed -->
            <tag name="mytag" layout="mytagvalue" /> <!-- Multiple allowed (Requires v2 storage accounts) -->
  </target>
</targets>

Parameters

name - Name of the target.

layout - Text to be rendered. Layout Required.

blobName - BlobName. Layout

container - Azure blob container name. Layout

contentType - Azure blob ContentType (Default = text/plain)

connectionString - Azure storage connection string. Ex. UseDevelopmentStorage=true;

serviceUri - Alternative to ConnectionString, where Managed Identiy is acquired from DefaultAzureCredential for User delegation SAS.

tenantIdentity - Alternative to ConnectionString. Used together with ServiceUri. Input for DefaultAzureCredential.

resourceIdentity - Alternative to ConnectionString. Used together with ServiceUri. Input for DefaultAzureCredential as ManagedIdentityResourceId.

clientIdentity - Alternative to ConnectionString. Used together with ServiceUri. Input for DefaultAzureCredential as ManagedIdentityClientId.

sharedAccessSignature - Alternative to ConnectionString. Used together with ServiceUri. Input for AzureSasCredential

accountName - Alternative to ConnectionString. Used together with ServiceUri. Input for StorageSharedKeyCredential-AccountName

accessKey - Alternative to ConnectionString. Used together with ServiceUri. Input for StorageSharedKeyCredential-AccessKey

Batching Policy

batchSize - Number of EventData items to send in a single batch (Default=100)

taskDelayMilliseconds - Artificial delay before sending to optimize for batching (Default=200 ms)

queueLimit - Number of pending LogEvents to have in memory queue, that are waiting to be sent (Default=10000)

overflowAction - Action to take when reaching limit of in memory queue (Default=Discard)

Retry Policy

taskTimeoutSeconds - How many seconds a Task is allowed to run before it is cancelled (Default 150 secs)

retryDelayMilliseconds - How many milliseconds to wait before next retry (Default 500ms, and will be doubled on each retry).

retryCount - How many attempts to retry the same Task, before it is aborted (Default 0)

Azure Blob Storage Emulator

The AzureBlobStorage-target uses Append blob operations, which is not support by Azure Storage Emulator from Microsoft.

It will fail with the following error:

Azure.RequestFailedException: This feature is not currently supported by the Storage Emulator

Instead one can try an alternative Azure Storage Emulator like Azurite

Azure ConnectionString

NLog Layout makes it possible to retrieve settings from many locations.

Lookup ConnectionString from appsettings.json

connectionString="${configsetting:ConnectionStrings.AzureBlob}"

  • Example appsettings.json on .NetCore:
  {
    "ConnectionStrings": {
      "AzureBlob": "UseDevelopmentStorage=true;"
    }
  }

Lookup ConnectionString from app.config

connectionString="${appsetting:ConnectionStrings.AzureBlob}"

  • Example app.config on .NetFramework:
  <configuration>
    <connectionStrings>
      <add name="AzureBlob" connectionString="UseDevelopmentStorage=true;"/>
    </connectionStrings>
  </configuration>

Lookup ConnectionString from environment-variable

connectionString="${environment:AZURE_STORAGE_CONNECTION_STRING}"

Lookup ConnectionString from NLog GlobalDiagnosticsContext (GDC)

connectionString="${gdc:AzureBlobConnectionString}"

  • Example code for setting GDC-value:
  NLog.GlobalDiagnosticsContext.Set("AzureBlobConnectionString", "UseDevelopmentStorage=true;");