[ aws . cloudformation ]



Sends a signal to the specified resource with a success or failure status. You can use the SignalResource API in conjunction with a creation policy or update policy. AWS CloudFormation doesn’t proceed with a stack creation or update until resources receive the required number of signals or the timeout period is exceeded. The SignalResource API is useful in cases where you want to send signals from anywhere other than an Amazon EC2 instance.

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.


--stack-name <value>
--logical-resource-id <value>
--unique-id <value>
--status <value>
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]
[--cli-auto-prompt <value>]


--stack-name (string)

The stack name or unique stack ID that includes the resource that you want to signal.

--logical-resource-id (string)

The logical ID of the resource that you want to signal. The logical ID is the name of the resource that given in the template.

--unique-id (string)

A unique ID of the signal. When you signal Amazon EC2 instances or Auto Scaling groups, specify the instance ID that you are signaling as the unique ID. If you send multiple signals to a single resource (such as signaling a wait condition), each signal requires a different unique ID.

--status (string)

The status of the signal, which is either success or failure. A failure signal causes AWS CloudFormation to immediately fail the stack creation or update.

Possible values:



--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

--cli-auto-prompt (boolean) Automatically prompt for CLI input parameters.

See ‘aws help’ for descriptions of global parameters.


To signal a resource

The following signal-resource example signals success to fulfill the wait condition named MyWaitCondition in the stack named my-stack.

aws cloudformation signal-resource \
    --stack-name my-stack \
    --logical-resource-id MyWaitCondition \
    --unique-id 1234 \
    --status SUCCESS

This command produces no output.