describe-change-set¶

Description¶

Returns the inputs for the change set and a list of changes that AWS CloudFormation will make if you execute the change set. For more information, see Updating Stacks Using Change Sets in the AWS CloudFormation User Guide.

Synopsis¶

  describe-change-set
--change-set-name <value>
[--stack-name <value>]
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]
[--cli-auto-prompt <value>]

Options¶

--change-set-name (string)

The name or Amazon Resource Name (ARN) of the change set that you want to describe.

--stack-name (string)

If you specified the name of a change set, specify the stack name or ID (ARN) of the change set you want to describe.

--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.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--max-items (integer)

The total number of items to return in the command’s output. If the total number of items available is more than the value specified, a NextToken is provided in the command’s output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--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.

Examples¶

To get information about a change set

The following describe-change-set example displays the details of the change set specified by change set name and stack name.

aws cloudformation describe-change-set \
    --change-set-name my-change-set \
    --stack-name my-stack

The following describe-change-set example displays the details of the change set specified by the full ARN of the change set:

aws cloudformation describe-change-set \
    --change-set-name arn:aws:cloudformation:us-west-2:123456789012:changeSet/my-change-set/bc9555ba-a949-xmpl-bfb8-f41d04ec5784

Output:

{
    "Changes": [
        {
            "Type": "Resource",
            "ResourceChange": {
                "Action": "Modify",
                "LogicalResourceId": "function",
                "PhysicalResourceId": "my-function-SEZV4XMPL4S5",
                "ResourceType": "AWS::Lambda::Function",
                "Replacement": "False",
                "Scope": [
                    "Properties"
                ],
                "Details": [
                    {
                        "Target": {
                            "Attribute": "Properties",
                            "Name": "Timeout",
                            "RequiresRecreation": "Never"
                        },
                        "Evaluation": "Static",
                        "ChangeSource": "DirectModification"
                    }
                ]
            }
        }
    ],
    "ChangeSetName": "my-change-set",
    "ChangeSetId": "arn:aws:cloudformation:us-west-2:123456789012:changeSet/my-change-set/4eca1a01-e285-xmpl-8026-9a1967bfb4b0",
    "StackId": "arn:aws:cloudformation:us-west-2:123456789012:stack/my-stack/d0a825a0-e4cd-xmpl-b9fb-061c69e99204",
    "StackName": "my-stack",
    "Description": null,
    "Parameters": null,
    "CreationTime": "2019-10-02T05:20:56.651Z",
    "ExecutionStatus": "AVAILABLE",
    "Status": "CREATE_COMPLETE",
    "StatusReason": null,
    "NotificationARNs": [],
    "RollbackConfiguration": {},
    "Capabilities": [
        "CAPABILITY_IAM"
    ],
    "Tags": null
}

Output¶

ChangeSetName -> (string)

The name of the change set.

ChangeSetId -> (string)

The ARN of the change set.

StackId -> (string)

The ARN of the stack that is associated with the change set.

StackName -> (string)

The name of the stack that is associated with the change set.

Description -> (string)

Information about the change set.

Parameters -> (list)

A list of Parameter structures that describes the input parameters and their values used to create the change set. For more information, see the Parameter data type.

(structure)

The Parameter data type.

ParameterKey -> (string)

The key associated with the parameter. If you don’t specify a key and value for a particular parameter, AWS CloudFormation uses the default value that is specified in your template.

ParameterValue -> (string)

The input value associated with the parameter.

UsePreviousValue -> (boolean)

During a stack update, use the existing parameter value that the stack is using for a given parameter key. If you specify true , do not specify a parameter value.

ResolvedValue -> (string)

Read-only. The value that corresponds to a Systems Manager parameter key. This field is returned only for ` SSM parameter types <https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/parameters-section-structure.html#aws-ssm-parameter-types>`__ in the template.

CreationTime -> (timestamp)

The start time when the change set was created, in UTC.

ExecutionStatus -> (string)

If the change set execution status is AVAILABLE , you can execute the change set. If you can’t execute the change set, the status indicates why. For example, a change set might be in an UNAVAILABLE state because AWS CloudFormation is still creating it or in an OBSOLETE state because the stack was already updated.

Status -> (string)

The current status of the change set, such as CREATE_IN_PROGRESS , CREATE_COMPLETE , or FAILED .

StatusReason -> (string)

A description of the change set’s status. For example, if your attempt to create a change set failed, AWS CloudFormation shows the error message.

NotificationARNs -> (list)

The ARNs of the Amazon Simple Notification Service (Amazon SNS) topics that will be associated with the stack if you execute the change set.

(string)

RollbackConfiguration -> (structure)

The rollback triggers for AWS CloudFormation to monitor during stack creation and updating operations, and for the specified monitoring period afterwards.

RollbackTriggers -> (list)

The triggers to monitor during stack creation or update actions.

By default, AWS CloudFormation saves the rollback triggers specified for a stack and applies them to any subsequent update operations for the stack, unless you specify otherwise. If you do specify rollback triggers for this parameter, those triggers replace any list of triggers previously specified for the stack. This means:

To use the rollback triggers previously specified for this stack, if any, don’t specify this parameter.

To specify new or updated rollback triggers, you must specify all the triggers that you want used for this stack, even triggers you’ve specifed before (for example, when creating the stack or during a previous stack update). Any triggers that you don’t include in the updated list of triggers are no longer applied to the stack.

To remove all currently specified triggers, specify an empty list for this parameter.

If a specified trigger is missing, the entire stack operation fails and is rolled back.

(structure)

A rollback trigger AWS CloudFormation monitors during creation and updating of stacks. If any of the alarms you specify goes to ALARM state during the stack operation or within the specified monitoring period afterwards, CloudFormation rolls back the entire stack operation.

Arn -> (string)

The Amazon Resource Name (ARN) of the rollback trigger.

If a specified trigger is missing, the entire stack operation fails and is rolled back.

Type -> (string)

The resource type of the rollback trigger. Currently, AWS::CloudWatch::Alarm is the only supported resource type.

MonitoringTimeInMinutes -> (integer)

The amount of time, in minutes, during which CloudFormation should monitor all the rollback triggers after the stack creation or update operation deploys all necessary resources.

The default is 0 minutes.

If you specify a monitoring period but do not specify any rollback triggers, CloudFormation still waits the specified period of time before cleaning up old resources after update operations. You can use this monitoring period to perform any manual stack validation desired, and manually cancel the stack creation or update (using CancelUpdateStack , for example) as necessary.

If you specify 0 for this parameter, CloudFormation still monitors the specified rollback triggers during stack creation and update operations. Then, for update operations, it begins disposing of old resources immediately once the operation completes.

Capabilities -> (list)

If you execute the change set, the list of capabilities that were explicitly acknowledged when the change set was created.

(string)

Tags -> (list)

If you execute the change set, the tags that will be associated with the stack.

(structure)

The Tag type enables you to specify a key-value pair that can be used to store information about an AWS CloudFormation stack.

Key -> (string)

Required . A string used to identify this tag. You can specify a maximum of 128 characters for a tag key. Tags owned by Amazon Web Services (AWS) have the reserved prefix: aws: .

Value -> (string)

Required . A string containing the value for this tag. You can specify a maximum of 256 characters for a tag value.

Changes -> (list)

A list of Change structures that describes the resources AWS CloudFormation changes if you execute the change set.

(structure)

The Change structure describes the changes AWS CloudFormation will perform if you execute the change set.

Type -> (string)

The type of entity that AWS CloudFormation changes. Currently, the only entity type is Resource .

ResourceChange -> (structure)

A ResourceChange structure that describes the resource and action that AWS CloudFormation will perform.

Action -> (string)

The action that AWS CloudFormation takes on the resource, such as Add (adds a new resource), Modify (changes a resource), or Remove (deletes a resource).

LogicalResourceId -> (string)

The resource’s logical ID, which is defined in the stack’s template.

PhysicalResourceId -> (string)

The resource’s physical ID (resource name). Resources that you are adding don’t have physical IDs because they haven’t been created.

ResourceType -> (string)

The type of AWS CloudFormation resource, such as AWS::S3::Bucket .

Replacement -> (string)

For the Modify action, indicates whether AWS CloudFormation will replace the resource by creating a new one and deleting the old one. This value depends on the value of the RequiresRecreation property in the ResourceTargetDefinition structure. For example, if the RequiresRecreation field is Always and the Evaluation field is Static , Replacement is True . If the RequiresRecreation field is Always and the Evaluation field is Dynamic , Replacement is Conditionally .

If you have multiple changes with different RequiresRecreation values, the Replacement value depends on the change with the most impact. A RequiresRecreation value of Always has the most impact, followed by Conditionally , and then Never .

Scope -> (list)

For the Modify action, indicates which resource attribute is triggering this update, such as a change in the resource attribute’s Metadata , Properties , or Tags .

(string)

Details -> (list)

For the Modify action, a list of ResourceChangeDetail structures that describes the changes that AWS CloudFormation will make to the resource.

(structure)

For a resource with Modify as the action, the ResourceChange structure describes the changes AWS CloudFormation will make to that resource.

Target -> (structure)

A ResourceTargetDefinition structure that describes the field that AWS CloudFormation will change and whether the resource will be recreated.

Attribute -> (string)

Indicates which resource attribute is triggering this update, such as a change in the resource attribute’s Metadata , Properties , or Tags .

Name -> (string)

If the Attribute value is Properties , the name of the property. For all other attributes, the value is null.

RequiresRecreation -> (string)

If the Attribute value is Properties , indicates whether a change to this property causes the resource to be recreated. The value can be Never , Always , or Conditionally . To determine the conditions for a Conditionally recreation, see the update behavior for that property in the AWS CloudFormation User Guide.

Evaluation -> (string)

Indicates whether AWS CloudFormation can determine the target value, and whether the target value will change before you execute a change set.

For Static evaluations, AWS CloudFormation can determine that the target value will change, and its value. For example, if you directly modify the InstanceType property of an EC2 instance, AWS CloudFormation knows that this property value will change, and its value, so this is a Static evaluation.

For Dynamic evaluations, cannot determine the target value because it depends on the result of an intrinsic function, such as a Ref or Fn::GetAtt intrinsic function, when the stack is updated. For example, if your template includes a reference to a resource that is conditionally recreated, the value of the reference (the physical ID of the resource) might change, depending on if the resource is recreated. If the resource is recreated, it will have a new physical ID, so all references to that resource will also be updated.

ChangeSource -> (string)

The group to which the CausingEntity value belongs. There are five entity groups:

ResourceReference entities are Ref intrinsic functions that refer to resources in the template, such as { "Ref" : "MyEC2InstanceResource" } .

ParameterReference entities are Ref intrinsic functions that get template parameter values, such as { "Ref" : "MyPasswordParameter" } .

ResourceAttribute entities are Fn::GetAtt intrinsic functions that get resource attribute values, such as { "Fn::GetAtt" : [ "MyEC2InstanceResource", "PublicDnsName" ] } .

DirectModification entities are changes that are made directly to the template.

Automatic entities are AWS::CloudFormation::Stack resource types, which are also known as nested stacks. If you made no changes to the AWS::CloudFormation::Stack resource, AWS CloudFormation sets the ChangeSource to Automatic because the nested stack’s template might have changed. Changes to a nested stack’s template aren’t visible to AWS CloudFormation until you run an update on the parent stack.

CausingEntity -> (string)

The identity of the entity that triggered this change. This entity is a member of the group that is specified by the ChangeSource field. For example, if you modified the value of the KeyPairName parameter, the CausingEntity is the name of the parameter (KeyPairName ).

If the ChangeSource value is DirectModification , no value is given for CausingEntity .

NextToken -> (string)

If the output exceeds 1 MB, a string that identifies the next page of changes. If there is no additional page, this value is null.

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