Logs sent to CloudWatch Logs - Amazon CloudWatch Logs
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Logs sent to CloudWatch Logs

User permissions

To enable sending logs to CloudWatch Logs, you must be signed in with the following permissions.

JSON
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Sid": "ReadWriteAccessForLogDeliveryActions",
            "Effect": "Allow",
            "Action": [
                "logs:GetDelivery",
                "logs:GetDeliverySource",
                "logs:PutDeliveryDestination",
                "logs:GetDeliveryDestinationPolicy",
                "logs:DeleteDeliverySource",
                "logs:PutDeliveryDestinationPolicy",
                "logs:CreateDelivery",
                "logs:GetDeliveryDestination",
                "logs:PutDeliverySource",
                "logs:DeleteDeliveryDestination",
                "logs:DeleteDeliveryDestinationPolicy",
                "logs:DeleteDelivery",
                "logs:UpdateDeliveryConfiguration"
            ],
            "Resource": [
            "arn:aws:logs:eusc-de-east-1:111122223333:delivery:*",
            "arn:aws:logs:eusc-de-east-1:444455556666:delivery-source:*",
            "arn:aws:logs:eusc-de-east-1:777788889999:delivery-destination:*"
            ]
        },
        {
            "Sid": "ListAccessForLogDeliveryActions",
            "Effect": "Allow",
            "Action": [
                "logs:DescribeDeliveryDestinations",
                "logs:DescribeDeliverySources",
                "logs:DescribeDeliveries",
                "logs:DescribeConfigurationTemplates"
            ],
            "Resource": "*"
        },
        {
            "Sid": "AllowUpdatesToResourcePolicyCWL",
            "Effect": "Allow",
            "Action": [
                "logs:PutResourcePolicy",
                "logs:DescribeResourcePolicies",
                "logs:DescribeLogGroups"
            ],
            "Resource": [
            "arn:aws:logs:eusc-de-east-1:123456789012:*"
            ]
        }
    ]
}

Log group resource policy

The log group where the logs are being sent must have a resource policy that includes certain permissions. If the log group currently does not have a resource policy, and the user setting up the logging has the logs:PutResourcePolicy, logs:DescribeResourcePolicies, and logs:DescribeLogGroups permissions for the log group, then AWS automatically creates the following policy for it when you begin sending the logs to CloudWatch Logs.

JSON
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Sid": "AWSLogDeliveryWrite20150319",
            "Effect": "Allow",
            "Principal": {
                "Service": [
                    "delivery.logs.amazonaws.com"
                ]
            },
            "Action": [
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": [
                "arn:aws:logs:us-east-1:111122223333:log-group:my-log-group:log-stream:*"
            ],
            "Condition": {
                "StringEquals": {
                    "aws:SourceAccount": [
                        "0123456789"
                    ]
                },
                "ArnLike": {
                    "aws:SourceArn": [
                        "arn:aws:logs:us-east-1:111122223333:*"
                    ]
                }
            }
        }
    ]
}

The log group's resource policy limit is 51,200 bytes. Once this limit is reached, AWS cannot add new permissions. This requires customers to manually modify the policy to grant the delivery.logs.amazonaws.com service principal permissions on the logs:CreateLogStream and logs:PutLogEvents actions. Customers should use a log group name prefix with wildcards such as /aws/vendedlogs/* and use this log group name for future Delivery creation.

JSON
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Sid": "AWSLogDeliveryWrite20150319",
            "Effect": "Allow",
            "Principal": {
                "Service": [
                    "delivery.logs.amazonaws.com"
                ]
            },
            "Action": [
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": [
                "arn:aws:logs:us-east-1:111122223333:log-group:my-log-group/aws/vendedlogs/*"
            ],
            "Condition": {
                "StringEquals": {
                    "aws:SourceAccount": [
                        "0123456789"
                    ]
                },
                "ArnLike": {
                    "aws:SourceArn": [
                        "arn:aws:logs:us-east-1:111122223333:*"
                    ]
                }
            }
        }
    ]
}