Table Of Contents


User Guide

First time using the AWS CLI? See the User Guide for help getting started.

Note: You are viewing the documentation for an older major version of the AWS CLI (version 1).

AWS CLI version 2, the latest major version of AWS CLI, is now stable and recommended for general use. To view this page for the AWS CLI version 2, click here. For more information see the AWS CLI version 2 installation instructions and migration guide.

[ aws . synthetics ]



Use this operation to change the settings of a canary that has already been created.

You can't use this operation to update the tags of an existing canary. To change the tags of an existing canary, use TagResource .

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.


--name <value>
[--code <value>]
[--execution-role-arn <value>]
[--runtime-version <value>]
[--schedule <value>]
[--run-config <value>]
[--success-retention-period-in-days <value>]
[--failure-retention-period-in-days <value>]
[--vpc-config <value>]
[--visual-reference <value>]
[--artifact-s3-location <value>]
[--artifact-config <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]


--name (string)

The name of the canary that you want to update. To find the names of your canaries, use DescribeCanaries .

You cannot change the name of a canary that has already been created.

--code (structure)

A structure that includes the entry point from which the canary should start running your script. If the script is stored in an S3 bucket, the bucket name, key, and version are also included.

S3Bucket -> (string)

If your canary script is located in S3, specify the bucket name here. Do not include s3:// as the start of the bucket name.

S3Key -> (string)

The S3 key of your script. For more information, see Working with Amazon S3 Objects .

S3Version -> (string)

The S3 version ID of your script.

ZipFile -> (blob)

If you input your canary script directly into the canary instead of referring to an S3 location, the value of this parameter is the base64-encoded contents of the .zip file that contains the script. It must be smaller than 256 Kb.

Handler -> (string)

The entry point to use for the source code when running the canary. This value must end with the string .handler . The string is limited to 29 characters or fewer.

Shorthand Syntax:


JSON Syntax:

  "S3Bucket": "string",
  "S3Key": "string",
  "S3Version": "string",
  "ZipFile": blob,
  "Handler": "string"

--execution-role-arn (string)

The ARN of the IAM role to be used to run the canary. This role must already exist, and must include as a principal in the trust policy. The role must also have the following permissions:

  • s3:PutObject
  • s3:GetBucketLocation
  • s3:ListAllMyBuckets
  • cloudwatch:PutMetricData
  • logs:CreateLogGroup
  • logs:CreateLogStream
  • logs:CreateLogStream

--runtime-version (string)

Specifies the runtime version to use for the canary. For a list of valid runtime versions and for more information about runtime versions, see Canary Runtime Versions .

--schedule (structure)

A structure that contains information about how often the canary is to run, and when these runs are to stop.

Expression -> (string)

A rate expression or a cron expression that defines how often the canary is to run.

For a rate expression, The syntax is rate(*number unit* ) . unit can be minute , minutes , or hour .

For example, rate(1 minute) runs the canary once a minute, rate(10 minutes) runs it once every 10 minutes, and rate(1 hour) runs it once every hour. You can specify a frequency between rate(1 minute) and rate(1 hour) .

Specifying rate(0 minute) or rate(0 hour) is a special value that causes the canary to run only once when it is started.

Use cron(*expression* ) to specify a cron expression. You can't schedule a canary to wait for more than a year before running. For information about the syntax for cron expressions, see Scheduling canary runs using cron .

DurationInSeconds -> (long)

How long, in seconds, for the canary to continue making regular runs according to the schedule in the Expression value. If you specify 0, the canary continues making runs until you stop it. If you omit this field, the default of 0 is used.

Shorthand Syntax:


JSON Syntax:

  "Expression": "string",
  "DurationInSeconds": long

--run-config (structure)

A structure that contains the timeout value that is used for each individual run of the canary.

TimeoutInSeconds -> (integer)

How long the canary is allowed to run before it must stop. You can't set this time to be longer than the frequency of the runs of this canary.

If you omit this field, the frequency of the canary is used as this value, up to a maximum of 14 minutes.

MemoryInMB -> (integer)

The maximum amount of memory available to the canary while it is running, in MB. This value must be a multiple of 64.

ActiveTracing -> (boolean)

Specifies whether this canary is to use active X-Ray tracing when it runs. Active tracing enables this canary run to be displayed in the ServiceLens and X-Ray service maps even if the canary does not hit an endpoint that has X-Ray tracing enabled. Using X-Ray tracing incurs charges. For more information, see Canaries and X-Ray tracing .

You can enable active tracing only for canaries that use version syn-nodejs-2.0 or later for their canary runtime.

EnvironmentVariables -> (map)

Specifies the keys and values to use for any environment variables used in the canary script. Use the following format:

{ "key1" : "value1", "key2" : "value2", ...}

Keys must start with a letter and be at least two characters. The total size of your environment variables cannot exceed 4 KB. You can't specify any Lambda reserved environment variables as the keys for your environment variables. For more information about reserved keys, see Runtime environment variables .

key -> (string)

value -> (string)

Shorthand Syntax:


JSON Syntax:

  "TimeoutInSeconds": integer,
  "MemoryInMB": integer,
  "ActiveTracing": true|false,
  "EnvironmentVariables": {"string": "string"

--success-retention-period-in-days (integer)

The number of days to retain data about successful runs of this canary.

--failure-retention-period-in-days (integer)

The number of days to retain data about failed runs of this canary.

--vpc-config (structure)

If this canary is to test an endpoint in a VPC, this structure contains information about the subnet and security groups of the VPC endpoint. For more information, see Running a Canary in a VPC .

SubnetIds -> (list)

The IDs of the subnets where this canary is to run.


SecurityGroupIds -> (list)

The IDs of the security groups for this canary.


Shorthand Syntax:


JSON Syntax:

  "SubnetIds": ["string", ...],
  "SecurityGroupIds": ["string", ...]

--visual-reference (structure)

Defines the screenshots to use as the baseline for comparisons during visual monitoring comparisons during future runs of this canary. If you omit this parameter, no changes are made to any baseline screenshots that the canary might be using already.

Visual monitoring is supported only on canaries running the syn-puppeteer-node-3.2 runtime or later. For more information, see Visual monitoring and Visual monitoring blueprint

BaseScreenshots -> (list)

An array of screenshots that will be used as the baseline for visual monitoring in future runs of this canary. If there is a screenshot that you don't want to be used for visual monitoring, remove it from this array.


A structure representing a screenshot that is used as a baseline during visual monitoring comparisons made by the canary.

ScreenshotName -> (string)

The name of the screenshot. This is generated the first time the canary is run after the UpdateCanary operation that specified for this canary to perform visual monitoring.

IgnoreCoordinates -> (list)

Coordinates that define the part of a screen to ignore during screenshot comparisons. To obtain the coordinates to use here, use the CloudWatch Logs console to draw the boundaries on the screen. For more information, see {LINK}


BaseCanaryRunId -> (string)

Specifies which canary run to use the screenshots from as the baseline for future visual monitoring with this canary. Valid values are nextrun to use the screenshots from the next run after this update is made, lastrun to use the screenshots from the most recent run before this update was made, or the value of Id in the CanaryRun from any past run of this canary.

JSON Syntax:

  "BaseScreenshots": [
      "ScreenshotName": "string",
      "IgnoreCoordinates": ["string", ...]
  "BaseCanaryRunId": "string"

--artifact-s3-location (string)

The location in Amazon S3 where Synthetics stores artifacts from the test runs of this canary. Artifacts include the log file, screenshots, and HAR files. The name of the S3 bucket can't include a period (.).

--artifact-config (structure)

A structure that contains the configuration for canary artifacts, including the encryption-at-rest settings for artifacts that the canary uploads to Amazon S3.

S3Encryption -> (structure)

A structure that contains the configuration of the encryption-at-rest settings for artifacts that the canary uploads to Amazon S3. Artifact encryption functionality is available only for canaries that use Synthetics runtime version syn-nodejs-puppeteer-3.3 or later. For more information, see Encrypting canary artifacts

EncryptionMode -> (string)

The encryption method to use for artifacts created by this canary. Specify SSE_S3 to use server-side encryption (SSE) with an Amazon S3-managed key. Specify SSE-KMS to use server-side encryption with a customer-managed KMS key.

If you omit this parameter, an Amazon Web Services-managed KMS key is used.

KmsKeyArn -> (string)

The ARN of the customer-managed KMS key to use, if you specify SSE-KMS for EncryptionMode

Shorthand Syntax:


JSON Syntax:

  "S3Encryption": {
    "EncryptionMode": "SSE_S3"|"SSE_KMS",
    "KmsKeyArn": "string"

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI 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.

--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. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See 'aws help' for descriptions of global parameters.