You can use [`-target=resource`](https://www.terraform.io/docs/commands/apply.html#target-resource) like this:

    terraform plan -target=module.mymodule.aws_instance.myinstance
    terraform apply -target=module.mymodule.aws_instance.myinstance

or

    terraform plan -target=aws_instance.myinstance
    terraform apply -target=aws_instance.myinstance




**Disclaimer**: Before downvoting the answer, please note that he actually asked to either &quot;exclude&quot; or &quot;run only ec2 resource&quot;. And after all this time the [exclude feature request][1] is still open in the terraform repo.


  [1]: https://github.com/hashicorp/terraform/issues/2253

Adding to Julio&#39;s [answer][1], you could *target* multiple resources in the following manner:

```
terraform init
terraform plan -target=resource_type1.resource_name1 -target=resource_type2.resource_name1
terraform apply -target=resource_type1.resource_name1 -target=resource_type2.resource_name1
```


  [1]: https://stackoverflow.com/a/46762141/13055097

&gt; I would like to run it to exclude rds that takes the longest time

Terraform currently does not support exclusion of resources (aka. inverse targeting).

[Issue #2253: &quot;feature request: inverse targeting / exclude&quot;](https://github.com/hashicorp/terraform/issues/2253)


(Thanks for the link Julio Daniel Reyes.)

    i=np.arange(1,4,dtype=np.int)
    a=np.arange(9).reshape(3,3)
and

    a
    &gt;&gt;&gt;array([[0, 1, 2],
              [3, 4, 5],
              [6, 7, 8]])
    a[:,0:1]
    &gt;&gt;&gt;array([[0],
              [3],
              [6]])
    a[:,0:2]
    &gt;&gt;&gt;array([[0, 1],
              [3, 4],
              [6, 7]])
    a[:,0:3]
    &gt;&gt;&gt;array([[0, 1, 2],
              [3, 4, 5],
              [6, 7, 8]])

Now I want to vectorize the array to print them all together. I try

    a[:,0:i]
or

    a[:,0:i[:,None]]

It gives TypeError: only integer scalar arrays can be converted to a scalar index

numpy array TypeError: only integer scalar arrays can be converted to a scalar index

Below are two PNG images:

[![enter image description here][1]][1]
[![enter image description here][2]][2]

Visually they are exactly identical - the only difference is that one has the semi-transparent background in some of the pixels (you can download the images to check it).

But when I use those images as an image cursor on JavaFX nodes, I get the following result:

[![enter image description here][4]][4]
[![enter image description here][3]][3]

First cursor (without partially transparent pixels) is still crisp, but the second gets distorted.

After fighting with the problem for a while, I discovered the algorithm that accounts for this difference - blending mode:

* &quot;Expected&quot; way (that you can see in this browser, for example) is to take the sum of values per channel, weighted by alpha values: `(1 - alpha) * background_color + alpha * foreground_color`.

* &quot;JavaFX Cursor&quot; gives the different formula: `(1 - alpha) * background_color + alpha^2 * foreground_color` (note the square).

I discovered the distortion, but I can&#39;t figure out what I did wrong and how I can correct this problem. 

Here&#39;s the complete runnable source code for my testing program:

    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.control.Button;
    import javafx.scene.layout.StackPane;
    import javafx.stage.Stage;
    import javafx.scene.ImageCursor;
    import javafx.scene.image.Image;

    public class HelloWorld extends Application {

        public static void main(String[] args) {
            launch(args);
        }

        @Override
        public void start(Stage primaryStage) {
            System.out.println(ImageCursor.getBestSize(32, 32));

            primaryStage.setTitle(&quot;Hello World!&quot;);

            StackPane root = new StackPane();
            root.setCursor(new ImageCursor(new Image(&quot;/test-cursor.png&quot;), 0, 0));

            primaryStage.setScene(new Scene(root, 100, 100));
            primaryStage.show();
        }
    }

How can I achieve proper rendering of such semi-transparent cursors?



  [1]: https://i.stack.imgur.com/2C2Lj.png
  [2]: https://i.stack.imgur.com/QqHPR.png
  [3]: https://i.stack.imgur.com/exITg.png
  [4]: https://i.stack.imgur.com/VyHIW.png

Why is javafx mangling my semi-transparent cursors?

It takes a long time to run terraform and wait.
So I would like to run it to exclude rds that takes the longest time to excute
or I would like to run only ec2 resource.
Is there a way to do such things in terraform?


I would like to run terraform only for a specific resource

<p>It takes a long time to run terraform and wait.
So I would like to run it to exclude rds that takes the longest time to excute
or I would like to run only ec2 resource.
Is there a way to do such things in terraform?</p>


The [Terraform Data Sources documentation][1] tells me what a data source is, but I do not quite understand it. Can somebody give me a use case of data source? What is the difference between it and configuring something using variables?


  [1]: https://www.terraform.io/docs/configuration/data-sources.html

How are data sources used in Terraform?

I&#39;m just getting started with terraform and I&#39;d like to be able to use AWS S3 as my backend for storing the state of my projects. 

&lt;!-- language: lang-hcl --&gt;

    terraform {
        backend &quot;s3&quot; {
          bucket = &quot;tfstate&quot;
          key = &quot;app-state&quot;
          region = &quot;us-east-1&quot;
        }
    }

I feel like it is sensible to setup my S3 bucket, IAM groups and polices for the backend storage infrastructure with terraform as well. 

If I setup my backend state before I apply my initial terraform infrastructure, it reasonably complains that the backend bucket is not yet created. So, my question becomes, how do I setup my terraform backend with terraform, while keeping my state for the backend tracked by terraform. Seems like a nested dolls problem.

I have some thoughts about how to script around this, for example, checking to see if the bucket exists or some state has been set, then bootstrapping terraform and finally copying the terraform tfstate up to s3 from the local file system after the first run. But before going down this laborious path, I thought I&#39;d make sure I wasn&#39;t missing something obvious.

Initial setup of terraform backend using terraform

I need to spin up a bunch of EC2 boxes for different users. Each user should be sandboxed from all the others, so each EC2 box needs its own SSH key.

What&#39;s the best way to accomplish this in Terraform?

Almost all of the instructions I&#39;ve found want me to manually create an SSH key and paste it into a terraform script.

(Bad) Examples:

* https://github.com/hashicorp/terraform/issues/1243, 
* http://2ninjas1blog.com/terraform-assigning-an-aws-key-pair-to-your-ec2-instance-resource/
* https://stackoverflow.com/questions/40120065/terraform-fails-to-import-key-pair-with-amazon-ec2)

Since I need to programmatically generate unique keys for many users, this is impractical.

This doesn&#39;t seem like a difficult use case, but I can&#39;t find docs on it anywhere.

At a pinch, I could generate Terraform scripts and inject SSH keys on the fly using Bash. But that seems like exactly the kind of thing that Terraform is supposed to do in the first place.

How do I create an SSH key in Terraform?

I want to create a Terraform configuration for DynamoDB table with multiple (&gt; 10) attributes. And I have no need to add all attributes as an index to 
`global_secondary_index` or `local_secondary_index`.
But when I run `terraform plan` command I have next error:

`All attributes must be indexed. Unused attributes: ...` 

I found the validation check in the Terraform repository in [validateDynamoDbTableAttributes][1] function. 

But also as I know the best practice is that `each table in DynamoDB is limited to a maximum of five global secondary indexes and five local secondary indexes` from [General Guidelines for Secondary Indexes in DynamoDB][2].

And since I have more than 10 attributes it looks like a problem to me.  
 
 


What I would like to understand why all attributes must be indexed and what to do in case if you have  a big number of attributes.

Thanks!


  [1]: https://github.com/terraform-providers/terraform-provider-aws/blob/v1.14.0/aws/validators.go#L1725-L1739 &quot;validateDynamoDbTableAttributes&quot;
  [2]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/bp-indexes-general.html

Terraform + DynamoDB: All attributes must be indexed

I must be being incredibly stupid but I can&#39;t figure out how to do simple string concatenation in Terraform.

I have the following data `null_data_source`:

    data &quot;null_data_source&quot; &quot;api_gw_url&quot; {
        inputs = {
          main_api_gw = &quot;app.api.${var.env_name == &quot;prod&quot; ? &quot;&quot; : var.env_name}mydomain.com&quot;
        }
    }

So when `env_name=&quot;prod&quot;` I want the output `app.api.mydomain.com` and for anything else - let&#39;s say `env_name=&quot;staging&quot;` I want `app.api.staging.mydomain.com`.

But the above will output `app.api.stagingmydomain.com` &lt;-- notice the missing dot after `staging`.

I tried concating the &quot;.&quot; if the env_name was anything but &quot;prod&quot; but Terraform errors:

    data &quot;null_data_source&quot; &quot;api_gw_url&quot; {
        inputs = {
          main_api_gw = &quot;app.api.${var.env_name == &quot;prod&quot; ? &quot;&quot; : var.env_name + &quot;.&quot;}mydomain.com&quot;
        }
    }

The error is `__builtin_StringToInt: strconv.ParseInt: parsing &quot;&quot;`

The [`concat()`][1] function in TF appears to be for lists not strings.

So as the title says: **How do you do simple string concatenation in Terraform?**

I can&#39;t believe I&#39;m asking how to concat 2 strings together XD

**Update:**

For anyone that has a similar issue I did this *horrific* workaround for the time being:

`main_api_gw = &quot;app.api.${var.env_name == &quot;prod&quot; ? &quot;&quot; : var.env_name}${var.env_name == &quot;prod&quot; ? &quot;&quot; : &quot;.&quot;}mydomain.com&quot;`

  [1]: https://www.terraform.io/docs/configuration-0-11/interpolation.html#concat-list1-list2-

Content Type	Original Author	Original Content on Stackoverflow
Question	negabaro	View Question on Stackoverflow
Solution 1 - Terraform	Julio Daniel Reyes	View Answer on Stackoverflow
Solution 2 - Terraform	Saurabh	View Answer on Stackoverflow
Solution 3 - Terraform	user1338062	View Answer on Stackoverflow

I would like to run terraform only for a specific resource

Terraform Problem Overview

Terraform Solutions

Solution 1 - Terraform

Solution 2 - Terraform

Solution 3 - Terraform

Why is javafx mangling my semi-transparent cursors?

numpy array TypeError: only integer scalar arrays can be converted to a scalar index

Attributions