DefaultNetworkAclArgs

Provides a resource to manage a VPC's default network ACL. This resource can manage the default network ACL of the default or a non-default VPC.

NOTE: This is an advanced resource with special caveats. Please read this document in its entirety before using this resource. The aws.ec2.DefaultNetworkAcl behaves differently from normal resources. This provider does not create this resource but instead attempts to "adopt" it into management. Every VPC has a default network ACL that can be managed but not destroyed. When the provider first adopts the Default Network ACL, it immediately removes all rules in the ACL. It then proceeds to create any rules specified in the configuration. This step is required so that only the rules specified in the configuration are created. This resource treats its inline rules as absolute; only the rules defined inline are created, and any additions/removals external to this resource will result in diffs being shown. For these reasons, this resource is incompatible with the aws.ec2.NetworkAclRule resource. For more information about Network ACLs, see the AWS Documentation on aws-network-acls.

Example Usage

Basic Example

The following config gives the Default Network ACL the same rules that AWS includes but pulls the resource under management by this provider. This means that any ACL rules added or changed will be detected as drift. No Java example available.

Example: Deny All Egress Traffic, Allow Ingress

The following denies all Egress traffic by omitting any egress rules, while including the default ingress rule to allow all traffic. No Java example available.

Example: Deny All Traffic To Any Subnet In The Default Network ACL

This config denies all traffic in the Default ACL. This can be useful if you want to lock down the VPC to force all resources to assign a non-default ACL.

package generated_program;
import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.aws.ec2.Vpc;
import com.pulumi.aws.ec2.VpcArgs;
import com.pulumi.aws.ec2.DefaultNetworkAcl;
import com.pulumi.aws.ec2.DefaultNetworkAclArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;
public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }
    public static void stack(Context ctx) {
        var mainvpc = new Vpc("mainvpc", VpcArgs.builder()
            .cidrBlock("10.1.0.0/16")
            .build());
        var default_ = new DefaultNetworkAcl("default", DefaultNetworkAclArgs.builder()
            .defaultNetworkAclId(mainvpc.defaultNetworkAclId())
            .build());
    }
}

Managing Subnets In A Default Network ACL

Within a VPC, all Subnets must be associated with a Network ACL. In order to "delete" the association between a Subnet and a non-default Network ACL, the association is destroyed by replacing it with an association between the Subnet and the Default ACL instead. When managing the Default Network ACL, you cannot "remove" Subnets. Instead, they must be reassigned to another Network ACL, or the Subnet itself must be destroyed. Because of these requirements, removing the subnet_ids attribute from the configuration of a aws.ec2.DefaultNetworkAcl resource may result in a reoccurring plan, until the Subnets are reassigned to another Network ACL or are destroyed. Because Subnets are by default associated with the Default Network ACL, any non-explicit association will show up as a plan to remove the Subnet. For example: if you have a custom aws.ec2.NetworkAcl with two subnets attached, and you remove the aws.ec2.NetworkAcl resource, after successfully destroying this resource future plans will show a diff on the managed aws.ec2.DefaultNetworkAcl, as those two Subnets have been orphaned by the now destroyed network acl and thus adopted by the Default Network ACL. In order to avoid a reoccurring plan, they will need to be reassigned, destroyed, or added to the subnet_ids attribute of the aws.ec2.DefaultNetworkAcl entry. As an alternative to the above, you can also specify the following lifecycle configuration in your aws.ec2.DefaultNetworkAcl resource:

package generated_program;
import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.aws.ec2.DefaultNetworkAcl;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;
public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }
    public static void stack(Context ctx) {
        var default_ = new DefaultNetworkAcl("default");
    }
}

Import

Default Network ACLs can be imported using the id, e.g.,

$ pulumi import aws:ec2/defaultNetworkAcl:DefaultNetworkAcl sample acl-7aaabd18