CloudWatchLogs / Client / create_log_group



Creates a log group with the specified name. You can create up to 1,000,000 log groups per Region per account.

You must use the following guidelines when naming a log group:

  • Log group names must be unique within a Region for an Amazon Web Services account.

  • Log group names can be between 1 and 512 characters long.

  • Log group names consist of the following characters: a-z, A-Z, 0-9, ‘_’ (underscore), ‘-’ (hyphen), ‘/’ (forward slash), ‘.’ (period), and ‘#’ (number sign)

  • Log group names can’t start with the string aws/

When you create a log group, by default the log events in the log group do not expire. To set a retention policy so that events expire and are deleted after a specified time, use PutRetentionPolicy.

If you associate an KMS key with the log group, ingested data is encrypted using the KMS key. This association is stored as long as the data encrypted with the KMS key is still within CloudWatch Logs. This enables CloudWatch Logs to decrypt this data whenever it is requested.

If you attempt to associate a KMS key with the log group but the KMS key does not exist or the KMS key is disabled, you receive an InvalidParameterException error.


CloudWatch Logs supports only symmetric KMS keys. Do not associate an asymmetric KMS key with your log group. For more information, see Using Symmetric and Asymmetric Keys.

See also: AWS API Documentation

Request Syntax

response = client.create_log_group(
        'string': 'string'
  • logGroupName (string) –


    A name for the log group.

  • kmsKeyId (string) – The Amazon Resource Name (ARN) of the KMS key to use when encrypting log data. For more information, see Amazon Resource Names.

  • tags (dict) –

    The key-value pairs to use for the tags.

    You can grant users access to certain log groups while preventing them from accessing other log groups. To do so, tag your groups and use IAM policies that refer to those tags. To assign tags when you create a log group, you must have either the logs:TagResource or logs:TagLogGroup permission. For more information about tagging, see Tagging Amazon Web Services resources. For more information about using tags to control access, see Controlling access to Amazon Web Services resources using tags.

    • (string) –

      • (string) –

  • logGroupClass (string) –

    Use this parameter to specify the log group class for this log group. There are two classes:

    • The Standard log class supports all CloudWatch Logs features.

    • The Infrequent Access log class supports a subset of CloudWatch Logs features and incurs lower costs.

    If you omit this parameter, the default of STANDARD is used.


    The value of logGroupClass can’t be changed after a log group is created.

    For details about the features supported by each class, see Log classes




  • CloudWatchLogs.Client.exceptions.InvalidParameterException

  • CloudWatchLogs.Client.exceptions.ResourceAlreadyExistsException

  • CloudWatchLogs.Client.exceptions.LimitExceededException

  • CloudWatchLogs.Client.exceptions.OperationAbortedException

  • CloudWatchLogs.Client.exceptions.ServiceUnavailableException