# CreateLogStream
<a name="API_CreateLogStream"></a>

Creates a log stream for the specified log group. A log stream is a sequence of log events that originate from a single source, such as an application instance or a resource that is being monitored.

There is no limit on the number of log streams that you can create for a log group. There is a limit of 50 TPS on `CreateLogStream` operations, after which transactions are throttled.

You must use the following guidelines when naming a log stream:
+ Log stream names must be unique within the log group.
+ Log stream names can be between 1 and 512 characters long.
+ Don't use ':' (colon) or '\$1' (asterisk) characters.

## Request Syntax
<a name="API_CreateLogStream_RequestSyntax"></a>

```
{
   "logGroupName": "string",
   "logStreamName": "string"
}
```

## Request Parameters
<a name="API_CreateLogStream_RequestParameters"></a>

For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).

The request accepts the following data in JSON format.

 ** [logGroupName](#API_CreateLogStream_RequestSyntax) **   <a name="CWL-CreateLogStream-request-logGroupName"></a>
The name of the log group.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 512.  
Pattern: `[\.\-_/#A-Za-z0-9]+`   
Required: Yes

 ** [logStreamName](#API_CreateLogStream_RequestSyntax) **   <a name="CWL-CreateLogStream-request-logStreamName"></a>
The name of the log stream.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 512.  
Pattern: `[^:*]*`   
Required: Yes

## Response Elements
<a name="API_CreateLogStream_ResponseElements"></a>

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

## Errors
<a name="API_CreateLogStream_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** InvalidParameterException **   
A parameter is specified incorrectly.  
HTTP Status Code: 400

 ** ResourceAlreadyExistsException **   
The specified resource already exists.  
HTTP Status Code: 400

 ** ResourceNotFoundException **   
The specified resource does not exist.  
HTTP Status Code: 400

 ** ServiceUnavailableException **   
The service cannot complete the request.  
HTTP Status Code: 500

## Examples
<a name="API_CreateLogStream_Examples"></a>

### To create a log stream
<a name="API_CreateLogStream_Example_1"></a>

The following example creates a log stream for the specified log group.

#### Sample Request
<a name="API_CreateLogStream_Example_1_Request"></a>

```
POST / HTTP/1.1
Host: logs.<region>.<domain>
X-Amz-Date: <DATE>
Authorization: AWS4-HMAC-SHA256 Credential=<Credential>, SignedHeaders=content-type;date;host;user-agent;x-amz-date;x-amz-target;x-amzn-requestid, Signature=<Signature>
User-Agent: <UserAgentString>
Accept: application/json
Content-Type: application/x-amz-json-1.1
Content-Length: <PayloadSizeBytes>
Connection: Keep-Alive
X-Amz-Target: Logs_20140328.CreateLogStream
{
  "logGroupName": "my-log-group",
  "logStreamName": "my-log-stream"
}
```

#### Sample Response
<a name="API_CreateLogStream_Example_1_Response"></a>

```
HTTP/1.1 200 OK
x-amzn-RequestId: <RequestId>
Content-Type: application/x-amz-json-1.1
Content-Length: <PayloadSizeBytes>
Date: <Date>
```

## See Also
<a name="API_CreateLogStream_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/logs-2014-03-28/CreateLogStream) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/logs-2014-03-28/CreateLogStream) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/logs-2014-03-28/CreateLogStream) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/logs-2014-03-28/CreateLogStream) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/logs-2014-03-28/CreateLogStream) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/logs-2014-03-28/CreateLogStream) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/logs-2014-03-28/CreateLogStream) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/logs-2014-03-28/CreateLogStream) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/logs-2014-03-28/CreateLogStream) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/logs-2014-03-28/CreateLogStream)