AWS Tools for Windows PowerShell
Command Reference

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Synopsis

Calls the Amazon CloudWatch Logs StartLiveTail API operation.

Syntax

Start-CWLLiveTail
-LogEventFilterPattern <String>
-LogGroupIdentifier <String[]>
-LogStreamNamePrefix <String[]>
-LogStreamName <String[]>
-Select <String>
-PassThru <SwitchParameter>
-Force <SwitchParameter>
-ClientConfig <AmazonCloudWatchLogsConfig>

Description

Starts a Live Tail streaming session for one or more log groups. A Live Tail session returns a stream of log events that have been recently ingested in the log groups. For more information, see Use Live Tail to view logs in near real time. The response to this operation is a response stream, over which the server sends live log events and the client receives them. The following objects are sent over the stream:
  • A single LiveTailSessionStart object is sent at the start of the session.
  • Every second, a LiveTailSessionUpdate object is sent. Each of these objects contains an array of the actual log events. If no new log events were ingested in the past second, the LiveTailSessionUpdate object will contain an empty array. The array of log events contained in a LiveTailSessionUpdate can include as many as 500 log events. If the number of log events matching the request exceeds 500 per second, the log events are sampled down to 500 log events to be included in each LiveTailSessionUpdate object. If your client consumes the log events slower than the server produces them, CloudWatch Logs buffers up to 10 LiveTailSessionUpdate events or 5000 log events, after which it starts dropping the oldest events.
  • A SessionStreamingException object is returned if an unknown error occurs on the server side.
  • A SessionTimeoutException object is returned when the session times out, after it has been kept open for three hours.
You can end a session before it times out by closing the session stream or by closing the client that is receiving the stream. The session also ends if the established connection between the client and the server breaks. For examples of using an SDK to start a Live Tail session, see Start a Live Tail session using an Amazon Web Services SDK.

Parameters

-ClientConfig <AmazonCloudWatchLogsConfig>
Amazon.PowerShell.Cmdlets.CWL.AmazonCloudWatchLogsClientCmdlet.ClientConfig
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-Force <SwitchParameter>
This parameter overrides confirmation prompts to force the cmdlet to continue its operation. This parameter should always be used with caution.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-LogEventFilterPattern <String>
An optional pattern to use to filter the results to include only log events that match the pattern. For example, a filter pattern of error 404 causes only log events that include both error and 404 to be included in the Live Tail stream.Regular expression filter patterns are supported.For more information about filter pattern syntax, see Filter and Pattern Syntax.
Required?False
Position?1
Accept pipeline input?True (ByValue, ByPropertyName)
-LogGroupIdentifier <String[]>
An array where each item in the array is a log group to include in the Live Tail session.Specify each log group by its ARN. If you specify an ARN, the ARN can't end with an asterisk (*). You can include up to 10 log groups.
Required?True
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesLogGroupIdentifiers
-LogStreamName <String[]>
If you specify this parameter, then only log events in the log streams that you specify here are included in the Live Tail session.If you specify this field, you can't also specify the logStreamNamePrefixes field.You can specify this parameter only if you specify only one log group in logGroupIdentifiers.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesLogStreamNames
-LogStreamNamePrefix <String[]>
If you specify this parameter, then only log events in the log streams that have names that start with the prefixes that you specify here are included in the Live Tail session.If you specify this field, you can't also specify the logStreamNames field.You can specify this parameter only if you specify only one log group in logGroupIdentifiers.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesLogStreamNamePrefixes
-PassThru <SwitchParameter>
Changes the cmdlet behavior to return the value passed to the LogEventFilterPattern parameter. The -PassThru parameter is deprecated, use -Select '^LogEventFilterPattern' instead. This parameter will be removed in a future version.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-Select <String>
Use the -Select parameter to control the cmdlet output. The default value is 'ResponseStream'. Specifying -Select '*' will result in the cmdlet returning the whole service response (Amazon.CloudWatchLogs.Model.StartLiveTailResponse). Specifying the name of a property of type Amazon.CloudWatchLogs.Model.StartLiveTailResponse will result in that property being returned. Specifying -Select '^ParameterName' will result in the cmdlet returning the selected cmdlet parameter value.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)

Common Credential and Region Parameters

-AccessKey <String>
The AWS access key for the user account. This can be a temporary access key if the corresponding session token is supplied to the -SessionToken parameter.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesAK
-Credential <AWSCredentials>
An AWSCredentials object instance containing access and secret key information, and optionally a token for session-based credentials.
Required?False
Position?Named
Accept pipeline input?True (ByValue, ByPropertyName)
-EndpointUrl <String>
The endpoint to make the call against.Note: This parameter is primarily for internal AWS use and is not required/should not be specified for normal usage. The cmdlets normally determine which endpoint to call based on the region specified to the -Region parameter or set as default in the shell (via Set-DefaultAWSRegion). Only specify this parameter if you must direct the call to a specific custom endpoint.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-NetworkCredential <PSCredential>
Used with SAML-based authentication when ProfileName references a SAML role profile. Contains the network credentials to be supplied during authentication with the configured identity provider's endpoint. This parameter is not required if the user's default network identity can or should be used during authentication.
Required?False
Position?Named
Accept pipeline input?True (ByValue, ByPropertyName)
-ProfileLocation <String>
Used to specify the name and location of the ini-format credential file (shared with the AWS CLI and other AWS SDKs)If this optional parameter is omitted this cmdlet will search the encrypted credential file used by the AWS SDK for .NET and AWS Toolkit for Visual Studio first. If the profile is not found then the cmdlet will search in the ini-format credential file at the default location: (user's home directory)\.aws\credentials.If this parameter is specified then this cmdlet will only search the ini-format credential file at the location given.As the current folder can vary in a shell or during script execution it is advised that you use specify a fully qualified path instead of a relative path.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesAWSProfilesLocation, ProfilesLocation
-ProfileName <String>
The user-defined name of an AWS credentials or SAML-based role profile containing credential information. The profile is expected to be found in the secure credential file shared with the AWS SDK for .NET and AWS Toolkit for Visual Studio. You can also specify the name of a profile stored in the .ini-format credential file used with the AWS CLI and other AWS SDKs.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesStoredCredentials, AWSProfileName
-Region <Object>
The system name of an AWS region or an AWSRegion instance. This governs the endpoint that will be used when calling service operations. Note that the AWS resources referenced in a call are usually region-specific.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesRegionToCall
-SecretKey <String>
The AWS secret key for the user account. This can be a temporary secret key if the corresponding session token is supplied to the -SessionToken parameter.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesSK, SecretAccessKey
-SessionToken <String>
The session token if the access and secret keys are temporary session-based credentials.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesST

Outputs

Amazon.CloudWatchLogs.Model.StartLiveTailResponseStream or Amazon.CloudWatchLogs.Model.StartLiveTailResponse
This cmdlet returns an Amazon.CloudWatchLogs.Model.StartLiveTailResponseStream object. The service call response (type Amazon.CloudWatchLogs.Model.StartLiveTailResponse) can also be referenced from properties attached to the cmdlet entry in the $AWSHistory stack.
Developer Guide
Service API Reference
AWS Tools for PowerShell User Guide

Supported Version

AWS Tools for PowerShell: 2.x.y.z