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User Guide

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[ aws . waf ]



Inserts or deletes ActivatedRule objects in a WebACL . Each Rule identifies web requests that you want to allow, block, or count. When you update a WebACL , you specify the following values:

  • A default action for the WebACL , either ALLOW or BLOCK . AWS WAF performs the default action if a request doesn't match the criteria in any of the Rules in a WebACL .
  • The Rules that you want to add and/or delete. If you want to replace one Rule with another, you delete the existing Rule and add the new one.
  • For each Rule , whether you want AWS WAF to allow requests, block requests, or count requests that match the conditions in the Rule .
  • The order in which you want AWS WAF to evaluate the Rules in a WebACL . If you add more than one Rule to a WebACL , AWS WAF evaluates each request against the Rules in order based on the value of Priority . (The Rule that has the lowest value for Priority is evaluated first.) When a web request matches all of the predicates (such as ByteMatchSets and IPSets ) in a Rule , AWS WAF immediately takes the corresponding action, allow or block, and doesn't evaluate the request against the remaining Rules in the WebACL , if any.

To create and configure a WebACL , perform the following steps:

  • Create and update the predicates that you want to include in Rules . For more information, see create-byte-match-set , update-byte-match-set , create-ip-set , update-ip-set , create-sql-injection-match-set , and update-sql-injection-match-set .
  • Create and update the Rules that you want to include in the WebACL . For more information, see create-rule and update-rule .
  • Create a WebACL . See create-web-acl .
  • Use get-change-token to get the change token that you provide in the change-token parameter of an update-web-acl request.
  • Submit an update-web-acl request to specify the Rules that you want to include in the WebACL , to specify the default action, and to associate the WebACL with a CloudFront distribution.

Be aware that if you try to add a RATE_BASED rule to a web ACL without setting the rule type when first creating the rule, the update-web-acl request will fail because the request tries to add a REGULAR rule (the default rule type) with the specified ID, which does not exist.

For more information about how to use the AWS WAF API to allow or block HTTP requests, see the AWS WAF Developer Guide .

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.


--web-acl-id <value>
--change-token <value>
[--updates <value>]
[--default-action <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]


--web-acl-id (string)

The WebACLId of the WebACL that you want to update. WebACLId is returned by create-web-acl and by list-web-acls .

--change-token (string)

The value returned by the most recent call to get-change-token .

--updates (list)

An array of updates to make to the WebACL .

An array of WebACLUpdate objects that you want to insert into or delete from a WebACL . For more information, see the applicable data types:

  • WebACLUpdate : Contains Action and ActivatedRule
  • ActivatedRule : Contains Action , OverrideAction , Priority , RuleId , and Type . ActivatedRule|OverrideAction applies only when updating or adding a RuleGroup to a WebACL . In this case you do not use ActivatedRule|Action . For all other update requests, ActivatedRule|Action is used instead of ActivatedRule|OverrideAction .
  • default-action : Contains Type

Shorthand Syntax:

Action=string,ActivatedRule={Priority=integer,RuleId=string,Action={Type=string},OverrideAction={Type=string},Type=string} ...

JSON Syntax:

    "Action": "INSERT"|"DELETE",
    "ActivatedRule": {
      "Priority": integer,
      "RuleId": "string",
      "Action": {
        "Type": "BLOCK"|"ALLOW"|"COUNT"
      "OverrideAction": {
        "Type": "NONE"|"COUNT"
      "Type": "REGULAR"|"RATE_BASED"|"GROUP"

--default-action (structure)

A default action for the web ACL, either ALLOW or BLOCK. AWS WAF performs the default action if a request doesn't match the criteria in any of the rules in a web ACL.

Shorthand Syntax:


JSON Syntax:

  "Type": "BLOCK"|"ALLOW"|"COUNT"

--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.

--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.


ChangeToken -> (string)

The change-token that you used to submit the update-web-acl request. You can also use this value to query the status of the request. For more information, see get-change-token-status .