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Abstract

4KyDvF7R_Mc_2zhIrSg.png"><figcaption></figcaption></figure>which leads to this error:<blockquote id="2d39">Template error: every Fn::Join object requires two parameters, (1) a string delimiter and (2) a list of strings to be joined or a function that returns a list of strings (such as Fn::GetAZs) to be joined.</blockquote>Do you see the problem? Look at the last line above.It should be indented like this:<figure id="d59e"><img src="https://cdn-images-1.readmedium.com/v2/resize:fit:800/1*fQYNhv-_0rjf-bhEvyKwgA.png"><figcaption></figcaption></figure>Join requires a list of two items. In YAML a list is represented like this list of fruit.<div id="20d8"><pre>- apple - orange - banana - dragonfruit</pre></div>Join needs a list with the delimiter and the things to be concatenated:<div id="1606"><pre>!Join

[your delimter like an empty string, a comma, a space, or a tab]
[your list goes hehre]</pre></div>So if I want a comma delimited list of fruit it would look like this:<div id="3ff4"><pre>!Join - ','
- apple #<<< two dashes here
- orange #<<< indented
- banana #<<< indented
- dragonfruit #<<< indented</pre></div>What AWS CloudShell keeps doing to me is this:</p

Options

<div id="59f7"><pre>!Join

- ','

- apple #<<< two dashes here
orange #<<< not indented
banana #<<< not indented
dragonfruit #<<< not indented</pre></div>Follow for updates.Teri Radichel | © <a href="https://2ndsightlab.com/?source=post_page---------------------------">2nd Sight Lab</a> 2023<div id="8b5f"><pre>About Teri Radichel:

⭐️ Author: Cybersecurity Books
⭐️ Presentations: Presentations by Teri Radichel
⭐️ Recognition: SANS Award, AWS Security Hero, IANS Faculty
⭐️ Certifications: SANS ~ GSE 240
⭐️ Education: BA Business, Master of Software Engineering, Master of Infosec
⭐️ Company: Penetration Tests, Assessments, Phone Consulting ~ 2nd Sight Lab</pre></div><div id="caae"><pre><span class="hljs-section">Need Help With Cybersecurity, Cloud, or Application Security?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
🔒 Request a penetration test or security assessment
🔒 Schedule a consulting call
🔒 Cybersecurity Speaker for Presentation</pre></div><div id="96b9"><pre>Follow <span class="hljs-keyword">for</span> more stories like <span class="hljs-keyword">this</span>:

❤️ Sign Up my Medium Email List ❤️ Twitter: @teriradichel ❤️ LinkedIn: https://www.linkedin.com/in/teriradichel ❤️ Mastodon: @teriradichel@infosec.exchange ❤️ Facebook: 2nd Sight Lab ❤️ YouTube: @2ndsightlab</pre></div><figure id="7286"><img src="https://cdn-images-1.readmedium.com/v2/resize:fit:800/1*4oxP4LXk8l8c3mpRvO7ejg.png"><figcaption></figcaption></figure></article></body>

Template error: every Fn::Join object requires two parameters, (1) a string delimiter and (2) a list of strings to be joined or a function that returns a list of strings (such as Fn::GetAZs) to be joined.

I seem to be making this error a lot because AWS CloudShell is “fixing” my template indentation

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I’ve gotten this single error too many times already today so documenting it in case anyone else is stuck on it. I happen to be working on inital admin scripts for a new AWS account in my latest series. Normally I don’t recommend CloudShell but it’s the easiest way to deploy the initial user and required policies.

So I’m usign CloudShell and I have some Join statements. And every time I copy and paste for one thing, CloudShell does not handle that well at all, as I’ve written before. I hope that will be fixed when AWS releases Amazon Linux 2023 in CloudShell.

In addition, when I copy and paste lines of code or move them around CloudShell jumps my code around and sometimes I don’t notice.

Here’s what I end up with:

which leads to this error:

Template error: every Fn::Join object requires two parameters, (1) a string delimiter and (2) a list of strings to be joined or a function that returns a list of strings (such as Fn::GetAZs) to be joined.

Do you see the problem? Look at the last line above.

It should be indented like this:

Join requires a list of two items. In YAML a list is represented like this list of fruit.

- apple
- orange
- banana
- dragonfruit

Join needs a list with the delimiter and the things to be concatenated:

!Join
  - [your delimter like an empty string, a comma, a space, or a tab]
  - [your list goes hehre]

So if I want a comma delimited list of fruit it would look like this:

!Join
  - ','
  - - apple #<<< two dashes here
    - orange #<<< indented
    - banana #<<< indented
    - dragonfruit #<<< indented

What AWS CloudShell keeps doing to me is this:

!Join
  - ','
  - - apple #<<< two dashes here
  - orange #<<< not indented
  - banana #<<< not indented
  - dragonfruit #<<< not indented

Follow for updates.

About Teri Radichel:
~~~~~~~~~~~~~~~~~~~~
⭐️ Author: Cybersecurity Books
⭐️ Presentations: Presentations by Teri Radichel
⭐️ Recognition: SANS Award, AWS Security Hero, IANS Faculty
⭐️ Certifications: SANS ~ GSE 240
⭐️ Education: BA Business, Master of Software Engineering, Master of Infosec
⭐️ Company: Penetration Tests, Assessments, Phone Consulting ~ 2nd Sight Lab

Need Help With Cybersecurity, Cloud, or Application Security?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
🔒 Request a penetration test or security assessment
🔒 Schedule a consulting call
🔒 Cybersecurity Speaker for Presentation

Follow for more stories like this:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
❤️ Sign Up my Medium Email List
❤️ Twitter: @teriradichel
❤️ LinkedIn: https://www.linkedin.com/in/teriradichel
❤️ Mastodon: @teriradichel@infosec.exchange
❤️ Facebook: 2nd Sight Lab
❤️ YouTube: @2ndsightlab