Examples of CloudFormation stack operation commands for the AWS CLI and PowerShell (original) (raw)

The following command line examples demonstrate how to perform individual CloudFormation actions with the AWS CLI and PowerShell. These examples include only the most commonly used actions. For a complete list, see cloudformation in the_AWS CLI Command Reference_.

The examples in this guide use the convention of a backslash (\) to indicate that a long command line continues on the next line.

Topics

• Cancel a stack update
• Continue rolling back an update
• Create a stack
• Create a stack that includes transforms
• Delete a stack
• Describe stack events
• Describe a stack resource
• Describe stack resources
• Describe stacks
• Get a template
• List stack resources
• List stacks
• Update a stack
• Validate your template
• Upload local artifacts to an S3 bucket with the AWS CLI

Cancel a stack update

Use the cancel-update-stack command to cancel a stack update. For more information, see Cancel a stack update.

CLI

AWS CLI

To cancel a stack update that is in progress

The following cancel-update-stack command cancels a stack update on the myteststack stack:

aws cloudformation cancel-update-stack --stack-name myteststack

• For API details, seeCancelUpdateStack in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Cancels an update on the specified stack.

Stop-CFNUpdateStack -StackName "myStack"

• For API details, seeCancelUpdateStack in AWS Tools for PowerShell Cmdlet Reference.

Continue rolling back an update

Use the continue-update-rollback command to continue rolling back an update. For more information, see Continue rolling back an update.

CLI

AWS CLI

To retry an update rollback

The following continue-update-rollback example resumes a rollback operation from a previously failed stack update.

aws cloudformation continue-update-rollback \
    --stack-name my-stack

This command produces no output.

• For API details, seeContinueUpdateRollback in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Continues rollback of the named stack, which should be in the state 'UPDATE_ROLLBACK_FAILED'. If the continued rollback is successful, the stack will enter state 'UPDATE_ROLLBACK_COMPLETE'.

Resume-CFNUpdateRollback -StackName "myStack"

• For API details, seeContinueUpdateRollback in AWS Tools for PowerShell Cmdlet Reference.

Create a stack

Use the create-stack command to create a stack. You must provide the stack name, the location of a valid template, and any input parameters. The parameter key names are case sensitive. If you mistype a parameter key name, CloudFormation doesn't create the stack and reports that the template doesn't contain that parameter.

By default, the describe-stacks command returns parameter values. To prevent sensitive parameter values such as passwords from being returned, include aNoEcho property set to TRUE in your CloudFormation template.

Important

Using the NoEcho attribute does not mask any information stored in the following:

• The Metadata template section. CloudFormation does not transform, modify, or redact any information you include in the Metadata section. For more information, seeCloudFormation template Metadata syntax.
• The Outputs template section. For more information, seeCloudFormation template Outputs syntax.
• The Metadata attribute of a resource definition. For more information, seeMetadata attribute.

We strongly recommend you do not use these mechanisms to include sensitive information, such as passwords or secrets.

Important

Rather than embedding sensitive information directly in your CloudFormation templates, we recommend you use dynamic parameters in the stack template to reference sensitive information that is stored and managed outside of CloudFormation, such as in the AWS Systems Manager Parameter Store or AWS Secrets Manager.

For more information, see the Do not embed credentials in your templates best practice.

The following examples show how to create a new stack with the specified name, template, and input parameters.

CLI

AWS CLI

To create an AWS CloudFormation stack

The following create-stacks command creates a stack with the name myteststack using the sampletemplate.json template:

aws cloudformation create-stack --stack-name myteststack --template-body file://sampletemplate.json --parameters ParameterKey=KeyPairName,ParameterValue=TestKey ParameterKey=SubnetIDs,ParameterValue=SubnetID1\\,SubnetID2

Output:

{
    "StackId": "arn:aws:cloudformation:us-east-1:123456789012:stack/myteststack/466df9e0-0dff-08e3-8e2f-5088487c4896"
}

For more information, see Stacks in the AWS CloudFormation User Guide.

• For API details, seeCreateStack in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Creates a new stack with the specified name. The template is parsed from the supplied content with customization parameters ('PK1' and 'PK2' represent the names of parameters declared in the template content, 'PV1' and 'PV2' represent the values for those parameters. The customization parameters can also be specified using 'Key' and 'Value' instead of 'ParameterKey' and 'ParameterValue'. If creation of the stack fails, it will not be rolled back.

New-CFNStack -StackName "myStack" `
             -TemplateBody "{TEMPLATE CONTENT HERE}" `
             -Parameter @( @{ ParameterKey="PK1"; ParameterValue="PV1" }, @{ ParameterKey="PK2"; ParameterValue="PV2" }) `
             -DisableRollback $true

Example 2: Creates a new stack with the specified name. The template is parsed from the supplied content with customization parameters ('PK1' and 'PK2' represent the names of parameters declared in the template content, 'PV1' and 'PV2' represent the values for those parameters. The customization parameters can also be specified using 'Key' and 'Value' instead of 'ParameterKey' and 'ParameterValue'. If creation of the stack fails, it will be rolled back.

$p1 = New-Object -Type Amazon.CloudFormation.Model.Parameter
$p1.ParameterKey = "PK1"
$p1.ParameterValue = "PV1"

$p2 = New-Object -Type Amazon.CloudFormation.Model.Parameter
$p2.ParameterKey = "PK2"
$p2.ParameterValue = "PV2"

New-CFNStack -StackName "myStack" `
             -TemplateBody "{TEMPLATE CONTENT HERE}" `
             -Parameter @( <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>p</mi><mn>1</mn><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">p1, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8389em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">p</span><span class="mord">1</span><span class="mpunct">,</span></span></span></span>p2 ) `
             -OnFailure "ROLLBACK"

Example 3: Creates a new stack with the specified name. The template is obtained from the Amazon S3 URL with customization parameters ('PK1' represents the name of a parameter declared in the template content, 'PV1' represents the value for the parameter. The customization parameters can also be specified using 'Key' and 'Value' instead of 'ParameterKey' and 'ParameterValue'. If creation of the stack fails, it will be rolled back (same as specifying -DisableRollback $false).

New-CFNStack -StackName "myStack" `
             -TemplateURL https://s3.amazonaws.com/amzn-s3-demo-bucket/templatefile.template `
             -Parameter @{ ParameterKey="PK1"; ParameterValue="PV1" }

Example 4: Creates a new stack with the specified name. The template is obtained from the Amazon S3 URL with customization parameters ('PK1' represents the name of a parameter declared in the template content, 'PV1' represents the value for the parameter. The customization parameters can also be specified using 'Key' and 'Value' instead of 'ParameterKey' and 'ParameterValue'. If creation of the stack fails, it will be rolled back (same as specifying -DisableRollback $false). The specified notification AENs will receive published stack-related events.

New-CFNStack -StackName "myStack" `
             -TemplateURL https://s3.amazonaws.com/amzn-s3-demo-bucket/templatefile.template `
             -Parameter @{ ParameterKey="PK1"; ParameterValue="PV1" } `
             -NotificationARN @( "arn1", "arn2" )

• For API details, seeCreateStack in AWS Tools for PowerShell Cmdlet Reference.

Alternatively, you can specify the AWS Systems Manager location of a template file.

AWS CLI

The following create-stack command creates a stack with the name myteststack using an AWS Systems Manager document for the template URL.

aws cloudformation create-stack --stack-name myteststack \
     --template-url "ssm-doc://arn:aws:ssm:us-east-1:123456789012:document/documentName"

Output:

{
    "StackId": "arn:aws:cloudformation:us-east-1:123456789012:stack/myteststack/466df9e0-0dff-08e3-8e2f-5088487c4896"
}

Create a stack that includes transforms

Use the deploy command to create a stack that includes transforms.

To create a stack from a template that includes transforms, you must use a change set. Instead of creating a change set and then initiating it, use the deploy command to combine these steps into a single command.

AWS CLI

The following deploy command creates a stack with the specified name, template, and input parameters.

aws cloudformation deploy --stack-name myteststack \
  --template /path_to_template/my-template.json \
  --parameter-overrides Key1=Value1 Key2=Value2

Delete a stack

Use the delete-stack command to delete a stack. For more information, seeDelete a stack from the CloudFormation console.

CLI

AWS CLI

To delete a stack

The following delete-stack example deletes the specified stack.

aws cloudformation delete-stack \
    --stack-name my-stack

This command produces no output.

• For API details, seeDeleteStack in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Deletes the specified stack.

Remove-CFNStack -StackName "myStack"

• For API details, seeDeleteStack in AWS Tools for PowerShell Cmdlet Reference.

If the deletion fails and returns a DELETE_FAILED state, you can choose to delete the stack by force using the --deletion-mode option. These are the following values that can be used with deletion-mode:

• STANDARD: Deletes the stack normally. This is the default deletion mode.
• FORCE_DELETE_STACK: Deletes the stack and skips all resources that are failing to delete.

AWS CLI

The following delete-stack command force deletes the`myteststack` stack using theFORCE_DELETE_STACK value with thedeletion-mode parameter:

aws cloudformation delete-stack --stack-name myteststack \
    --deletion-mode FORCE_DELETE_STACK

This command produces no output.

After using FORCE_DELETE_STACK, you can use thelist-stack-resources command to list the resources that were skipped during the stack deletion process. The retained resources will show a DELETE_SKIPPED status. For more information, see List stack resources.

Describe stack events

Use the describe-stack-events command to describe stack events. For more information, see Monitor stack progress.

CLI

AWS CLI

To describe stack events

The following describe-stack-events example displays the 2 most recent events for the specified stack.

aws cloudformation describe-stack-events \
    --stack-name my-stack \
    --max-items 2

{
    "StackEvents": [
        {
            "StackId": "arn:aws:cloudformation:us-west-2:123456789012:stack/my-stack/d0a825a0-e4cd-xmpl-b9fb-061c69e99204",
            "EventId": "4e1516d0-e4d6-xmpl-b94f-0a51958a168c",
            "StackName": "my-stack",
            "LogicalResourceId": "my-stack",
            "PhysicalResourceId": "arn:aws:cloudformation:us-west-2:123456789012:stack/my-stack/d0a825a0-e4cd-xmpl-b9fb-061c69e99204",
            "ResourceType": "AWS::CloudFormation::Stack",
            "Timestamp": "2019-10-02T05:34:29.556Z",
            "ResourceStatus": "UPDATE_COMPLETE"
        },
        {
            "StackId": "arn:aws:cloudformation:us-west-2:123456789012:stack/my-stack/d0a825a0-e4cd-xmpl-b9fb-061c69e99204",
            "EventId": "4dd3c810-e4d6-xmpl-bade-0aaf8b31ab7a",
            "StackName": "my-stack",
            "LogicalResourceId": "my-stack",
            "PhysicalResourceId": "arn:aws:cloudformation:us-west-2:123456789012:stack/my-stack/d0a825a0-e4cd-xmpl-b9fb-061c69e99204",
            "ResourceType": "AWS::CloudFormation::Stack",
            "Timestamp": "2019-10-02T05:34:29.127Z",
            "ResourceStatus": "UPDATE_COMPLETE_CLEANUP_IN_PROGRESS"
        }
    ],
    "NextToken": "eyJOZXh0VG9XMPLiOiBudWxsLCAiYm90b190cnVuY2F0ZV9hbW91bnQiOiAyfQ=="
}

• For API details, seeDescribeStackEvents in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Returns all stack related events for the specified stack.

Get-CFNStackEvent -StackName "myStack"

• For API details, seeDescribeStackEvents in AWS Tools for PowerShell Cmdlet Reference.

Describe a stack resource

CLI

AWS CLI

To get information about a stack resource

The following describe-stack-resource example displays details for the resource named MyFunction in the specified stack.

aws cloudformation describe-stack-resource \
    --stack-name MyStack \
    --logical-resource-id MyFunction

Output:

{
    "StackResourceDetail": {
        "StackName": "MyStack",
        "StackId": "arn:aws:cloudformation:us-east-2:123456789012:stack/MyStack/d0a825a0-e4cd-xmpl-b9fb-061c69e99204",
        "LogicalResourceId": "MyFunction",
        "PhysicalResourceId": "my-function-SEZV4XMPL4S5",
        "ResourceType": "AWS::Lambda::Function",
        "LastUpdatedTimestamp": "2019-10-02T05:34:27.989Z",
        "ResourceStatus": "UPDATE_COMPLETE",
        "Metadata": "{}",
        "DriftInformation": {
            "StackResourceDriftStatus": "IN_SYNC"
        }
    }
}

• For API details, seeDescribeStackResource in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Returns the description of a resource identified in the template associated with the specified stack by the logical ID "MyDBInstance".

Get-CFNStackResource -StackName "myStack" -LogicalResourceId "MyDBInstance"

• For API details, seeDescribeStackResource in AWS Tools for PowerShell Cmdlet Reference.

Describe stack resources

CLI

AWS CLI

To get information about a stack resource

The following describe-stack-resources example displays details for the resources in the specified stack.

aws cloudformation describe-stack-resources \
    --stack-name my-stack

Output:

{
    "StackResources": [
        {
            "StackName": "my-stack",
            "StackId": "arn:aws:cloudformation:us-west-2:123456789012:stack/my-stack/d0a825a0-e4cd-xmpl-b9fb-061c69e99204",
            "LogicalResourceId": "bucket",
            "PhysicalResourceId": "my-stack-bucket-1vc62xmplgguf",
            "ResourceType": "AWS::S3::Bucket",
            "Timestamp": "2019-10-02T04:34:11.345Z",
            "ResourceStatus": "CREATE_COMPLETE",
            "DriftInformation": {
                "StackResourceDriftStatus": "IN_SYNC"
            }
        },
        {
            "StackName": "my-stack",
            "StackId": "arn:aws:cloudformation:us-west-2:123456789012:stack/my-stack/d0a825a0-e4cd-xmpl-b9fb-061c69e99204",
            "LogicalResourceId": "function",
            "PhysicalResourceId": "my-function-SEZV4XMPL4S5",
            "ResourceType": "AWS::Lambda::Function",
            "Timestamp": "2019-10-02T05:34:27.989Z",
            "ResourceStatus": "UPDATE_COMPLETE",
            "DriftInformation": {
                "StackResourceDriftStatus": "IN_SYNC"
            }
        },
        {
            "StackName": "my-stack",
            "StackId": "arn:aws:cloudformation:us-west-2:123456789012:stack/my-stack/d0a825a0-e4cd-xmpl-b9fb-061c69e99204",
            "LogicalResourceId": "functionRole",
            "PhysicalResourceId": "my-functionRole-HIZXMPLEOM9E",
            "ResourceType": "AWS::IAM::Role",
            "Timestamp": "2019-10-02T04:34:06.350Z",
            "ResourceStatus": "CREATE_COMPLETE",
            "DriftInformation": {
                "StackResourceDriftStatus": "IN_SYNC"
            }
        }
    ]
}

• For API details, seeDescribeStackResources in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Returns the AWS resource descriptions for up to 100 resources associated with the specified stack. To obtain details of all resources associated with a stack use the Get-CFNStackResourceSummary, which also supports manual paging of the results.

Get-CFNStackResourceList -StackName "myStack"

Example 2: Returns the description of the Amazon EC2 instance identified in the template associated with the specified stack by the logical ID "Ec2Instance".

Get-CFNStackResourceList -StackName "myStack" -LogicalResourceId "Ec2Instance"

Example 3: Returns the description of up to 100 resources associated with the stack containing an Amazon EC2 instance identified by instance ID "i-123456". To obtain details of all resources associated with a stack use the Get-CFNStackResourceSummary, which also supports manual paging of the results.

Get-CFNStackResourceList -PhysicalResourceId "i-123456"

Example 4: Returns the description of the Amazon EC2 instance identified by the logical ID "Ec2Instance" in the template for a stack. The stack is identified using the physical resource ID of a resource it contains, in this case also an Amazon EC2 instance with instance ID "i-123456". A different physical resource could also be used to identify the stack depending on the template content, for example an Amazon S3 bucket.

Get-CFNStackResourceList -PhysicalResourceId "i-123456" -LogicalResourceId "Ec2Instance"

• For API details, seeDescribeStackResources in AWS Tools for PowerShell Cmdlet Reference.

Describe stacks

CLI

AWS CLI

To describe AWS CloudFormation stacks

The following describe-stacks command shows summary information for the myteststack stack:

aws cloudformation describe-stacks --stack-name myteststack

Output:

{
    "Stacks":  [
        {
            "StackId": "arn:aws:cloudformation:us-east-1:123456789012:stack/myteststack/466df9e0-0dff-08e3-8e2f-5088487c4896",
            "Description": "AWS CloudFormation Sample Template S3_Bucket: Sample template showing how to create a publicly accessible S3 bucket. **WARNING** This template creates an S3 bucket. You will be billed for the AWS resources used if you create a stack from this template.",
            "Tags": [],
            "Outputs": [
                {
                    "Description": "Name of S3 bucket to hold website content",
                    "OutputKey": "BucketName",
                    "OutputValue": "myteststack-s3bucket-jssofi1zie2w"
                }
            ],
            "StackStatusReason": null,
            "CreationTime": "2013-08-23T01:02:15.422Z",
            "Capabilities": [],
            "StackName": "myteststack",
            "StackStatus": "CREATE_COMPLETE",
            "DisableRollback": false
        }
    ]
}

For more information, see Stacks in the AWS CloudFormation User Guide.

• For API details, seeDescribeStacks in AWS CLI Command Reference.

Go

SDK for Go V2

import (
    "context"
    "log"

    "github.com/aws/aws-sdk-go-v2/aws"
    "github.com/aws/aws-sdk-go-v2/service/cloudformation"
)

// StackOutputs defines a map of outputs from a specific stack.
type StackOutputs map[string]string

type CloudFormationActions struct {
    CfnClient *cloudformation.Client
}

// GetOutputs gets the outputs from a CloudFormation stack and puts them into a structured format.
func (actor CloudFormationActions) GetOutputs(ctx context.Context, stackName string) StackOutputs {
    output, err := actor.CfnClient.DescribeStacks(ctx, &cloudformation.DescribeStacksInput{
        StackName: aws.String(stackName),
    })
    if err != nil || len(output.Stacks) == 0 {
        log.Panicf("Couldn't find a CloudFormation stack named %v. Here's why: %v\n", stackName, err)
    }
    stackOutputs := StackOutputs{}
    for _, out := range output.Stacks[0].Outputs {
        stackOutputs[*out.OutputKey] = *out.OutputValue
    }
    return stackOutputs
}

• For API details, seeDescribeStacks in AWS SDK for Go API Reference.

PowerShell

Tools for PowerShell

Example 1: Returns a collection of Stack instances describing all of the user's stacks.

Get-CFNStack

Example 2: Returns a Stack instance describing the specified stack

Get-CFNStack -StackName "myStack"

• For API details, seeDescribeStacks in AWS Tools for PowerShell Cmdlet Reference.

Get a template

CLI

AWS CLI

To view the template body for an AWS CloudFormation stack

The following get-template command shows the template for the myteststack stack:

aws cloudformation get-template --stack-name myteststack

Output:

{
    "TemplateBody": {
        "AWSTemplateFormatVersion": "2010-09-09",
        "Outputs": {
            "BucketName": {
                "Description": "Name of S3 bucket to hold website content",
                "Value": {
                    "Ref": "S3Bucket"
                }
            }
        },
        "Description": "AWS CloudFormation Sample Template S3_Bucket: Sample template showing how to create a publicly accessible S3 bucket. **WARNING** This template creates an S3 bucket. You will be billed for the AWS resources used if you create a stack from this template.",
        "Resources": {
            "S3Bucket": {
                "Type": "AWS::S3::Bucket",
                "Properties": {
                    "AccessControl": "PublicRead"
                }
            }
        }
    }
}

• For API details, seeGetTemplate in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Returns the template associated with the specified stack.

Get-CFNTemplate -StackName "myStack"

• For API details, seeGetTemplate in AWS Tools for PowerShell Cmdlet Reference.

List stack resources

CLI

AWS CLI

To list resources in a stack

The following command displays the list of resources in the specified stack.

aws cloudformation list-stack-resources \
    --stack-name my-stack

Output:

{
    "StackResourceSummaries": [
        {
            "LogicalResourceId": "bucket",
            "PhysicalResourceId": "my-stack-bucket-1vc62xmplgguf",
            "ResourceType": "AWS::S3::Bucket",
            "LastUpdatedTimestamp": "2019-10-02T04:34:11.345Z",
            "ResourceStatus": "CREATE_COMPLETE",
            "DriftInformation": {
                "StackResourceDriftStatus": "IN_SYNC"
            }
        },
        {
            "LogicalResourceId": "function",
            "PhysicalResourceId": "my-function-SEZV4XMPL4S5",
            "ResourceType": "AWS::Lambda::Function",
            "LastUpdatedTimestamp": "2019-10-02T05:34:27.989Z",
            "ResourceStatus": "UPDATE_COMPLETE",
            "DriftInformation": {
                "StackResourceDriftStatus": "IN_SYNC"
            }
        },
        {
            "LogicalResourceId": "functionRole",
            "PhysicalResourceId": "my-functionRole-HIZXMPLEOM9E",
            "ResourceType": "AWS::IAM::Role",
            "LastUpdatedTimestamp": "2019-10-02T04:34:06.350Z",
            "ResourceStatus": "CREATE_COMPLETE",
            "DriftInformation": {
                "StackResourceDriftStatus": "IN_SYNC"
            }
        }
    ]
}

• For API details, seeListStackResources in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Returns descriptions of all the resources associated with the specified stack.

Get-CFNStackResourceSummary -StackName "myStack"

• For API details, seeListStackResources in AWS Tools for PowerShell Cmdlet Reference.

List stacks

Use the list-stacks command to list stacks. To list only stacks with the specified status codes, include the --stack-status-filter option. You can specify one or more stack status codes for the --stack-status-filter option. For more information, see Stack status codes.

CLI

AWS CLI

To list AWS CloudFormation stacks

The following list-stacks command shows a summary of all stacks that have a status of CREATE_COMPLETE:

aws cloudformation list-stacks --stack-status-filter CREATE_COMPLETE

Output:

[
    {
        "StackId": "arn:aws:cloudformation:us-east-1:123456789012:stack/myteststack/466df9e0-0dff-08e3-8e2f-5088487c4896",
        "TemplateDescription": "AWS CloudFormation Sample Template S3_Bucket: Sample template showing how to create a publicly accessible S3 bucket. **WARNING** This template creates an S3 bucket. You will be billed for the AWS resources used if you create a stack from this template.",
        "StackStatusReason": null,
        "CreationTime": "2013-08-26T03:27:10.190Z",
        "StackName": "myteststack",
        "StackStatus": "CREATE_COMPLETE"
    }
]

• For API details, seeListStacks in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Returns summary information for all stacks.

Get-CFNStackSummary

Example 2: Returns summary information for all stacks that are currently being created.

Get-CFNStackSummary -StackStatusFilter "CREATE_IN_PROGRESS"

Example 3: Returns summary information for all stacks that are currently being created or updated.

Get-CFNStackSummary -StackStatusFilter @("CREATE_IN_PROGRESS", "UPDATE_IN_PROGRESS")

• For API details, seeListStacks in AWS Tools for PowerShell Cmdlet Reference.

Update a stack

Use the update-stack command to directly update a stack. You specify the stack, and parameter values and capabilities that you want to update, and, if you want use an updated template, the name of the template. For more information, see Update stacks directly.

CLI

AWS CLI

To update AWS CloudFormation stacks

The following update-stack command updates the template and input parameters for the mystack stack:

aws cloudformation update-stack --stack-name mystack --template-url https://s3.amazonaws.com/sample/updated.template --parameters ParameterKey=KeyPairName,ParameterValue=SampleKeyPair ParameterKey=SubnetIDs,ParameterValue=SampleSubnetID1\\,SampleSubnetID2

The following update-stack command updates just the SubnetIDs parameter value for the mystack stack. If you don't specify a parameter value, the default value that is specified in the template is used:

aws cloudformation update-stack --stack-name mystack --template-url https://s3.amazonaws.com/sample/updated.template --parameters ParameterKey=KeyPairName,UsePreviousValue=true ParameterKey=SubnetIDs,ParameterValue=SampleSubnetID1\\,UpdatedSampleSubnetID2

The following update-stack command adds two stack notification topics to the mystack stack:

aws cloudformation update-stack --stack-name mystack --use-previous-template --notification-arns "arn:aws:sns:use-east-1:123456789012:mytopic1" "arn:aws:sns:us-east-1:123456789012:mytopic2"

For more information, see AWS CloudFormation stack updates in the AWS CloudFormation User Guide.

• For API details, seeUpdateStack in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Updates the stack 'myStack' with the specified template and customization parameters. 'PK1' represents the name of a parameter declared in the template and 'PV1' represents its value. The customization parameters can also be specified using 'Key' and 'Value' instead of 'ParameterKey' and 'ParameterValue'.

Update-CFNStack -StackName "myStack" `
                -TemplateBody "{Template Content Here}" `
                -Parameter @{ ParameterKey="PK1"; ParameterValue="PV1" }

Example 2: Updates the stack 'myStack' with the specified template and customization parameters. 'PK1' and 'PK2' represent the names of parameters declared in the template, 'PV1' and 'PV2' represents their requested values. The customization parameters can also be specified using 'Key' and 'Value' instead of 'ParameterKey' and 'ParameterValue'.

Update-CFNStack -StackName "myStack" `
                -TemplateBody "{Template Content Here}" `
                -Parameter @( @{ ParameterKey="PK1"; ParameterValue="PV1" }, @{ ParameterKey="PK2"; ParameterValue="PV2" } )

Example 3: Updates the stack 'myStack' with the specified template and customization parameters. 'PK1' represents the name of a parameter declared in the template and 'PV2' represents its value. The customization parameters can also be specified using 'Key' and 'Value' instead of 'ParameterKey' and 'ParameterValue'.

Update-CFNStack -StackName "myStack" -TemplateBody "{Template Content Here}" -Parameters @{ ParameterKey="PK1"; ParameterValue="PV1" }

Example 4: Updates the stack 'myStack' with the specified template, obtained from Amazon S3, and customization parameters. 'PK1' and 'PK2' represent the names of parameters declared in the template, 'PV1' and 'PV2' represents their requested values. The customization parameters can also be specified using 'Key' and 'Value' instead of 'ParameterKey' and 'ParameterValue'.

Update-CFNStack -StackName "myStack" `
                -TemplateURL https://s3.amazonaws.com/amzn-s3-demo-bucket/templatefile.template `
                -Parameter @( @{ ParameterKey="PK1"; ParameterValue="PV1" }, @{ ParameterKey="PK2"; ParameterValue="PV2" } )

Example 5: Updates the stack 'myStack', which is assumed in this example to contain IAM resources, with the specified template, obtained from Amazon S3, and customization parameters. 'PK1' and 'PK2' represent the names of parameters declared in the template, 'PV1' and 'PV2' represents their requested values. The customization parameters can also be specified using 'Key' and 'Value' instead of 'ParameterKey' and 'ParameterValue'. Stacks containing IAM resources require you to specify the -Capabilities "CAPABILITY_IAM" parameter otherwise the update will fail with an 'InsufficientCapabilities' error.

Update-CFNStack -StackName "myStack" `
                -TemplateURL https://s3.amazonaws.com/amzn-s3-demo-bucket/templatefile.template `
                -Parameter @( @{ ParameterKey="PK1"; ParameterValue="PV1" }, @{ ParameterKey="PK2"; ParameterValue="PV2" } ) `
                -Capabilities "CAPABILITY_IAM"

• For API details, seeUpdateStack in AWS Tools for PowerShell Cmdlet Reference.

Note

To remove all notifications, specify for [] for the--notification-arns option.

Validate your template

Use the validate-template command to check your template file for syntax errors.

During validation, CloudFormation first checks if the template is valid JSON. If it isn't, CloudFormation checks if the template is valid YAML. If both checks fail, CloudFormation returns a template validation error.

CLI

AWS CLI

To validate an AWS CloudFormation template

The following validate-template command validates the sampletemplate.json template:

aws cloudformation validate-template --template-body file://sampletemplate.json

Output:

{
    "Description": "AWS CloudFormation Sample Template S3_Bucket: Sample template showing how to create a publicly accessible S3 bucket. **WARNING** This template creates an S3 bucket. You will be billed for the AWS resources used if you create a stack from this template.",
    "Parameters": [],
    "Capabilities": []
}

For more information, see Working with AWS CloudFormation Templates in the AWS CloudFormation User Guide.

• For API details, seeValidateTemplate in AWS CLI Command Reference.

PowerShell

Tools for PowerShell

Example 1: Validates the specified template content. The output details the capabilities, description and parameters of the template.

Test-CFNTemplate -TemplateBody "{TEMPLATE CONTENT HERE}"

Example 2: Validates the specified template accessed via an Amazon S3 URL. The output details the capabilities, description and parameters of the template.

Test-CFNTemplate -TemplateURL https://s3.amazonaws.com/amzn-s3-demo-bucket/templatefile.template

• For API details, seeValidateTemplate in AWS Tools for PowerShell Cmdlet Reference.

The following is an example response that produces a validation error.

{
    "ResponseMetadata": {
        "RequestId": "4ae33ec0-1988-11e3-818b-e15a6df955cd"
    },
    "Errors": [
        {
            "Message": "Template format error: JSON not well-formed. (line 11, column 8)",
            "Code": "ValidationError",
            "Type": "Sender"
        }
    ],
    "Capabilities": [],
    "Parameters": []
}
A client error (ValidationError) occurred: Template format error: JSON not well-formed. (line 11, column 8)

Note

The validate-template command is designed to check only the syntax of your template. It does not ensure that the property values that you have specified for a resource are valid for that resource. Nor does it determine the number of resources that will exist when the stack is created.

To check the operational validity, you need to attempt to create the stack. There is no sandbox or test area for AWS CloudFormation stacks, so you are charged for the resources you create during testing.

Example availability

Can't find what you need? Request a new example by using the Provide feedback link at the bottom of this page.