update

Author: abregman

README.md

@@ -2,7 +2,7 @@
 
 :information_source:  This repo contains questions and exercises on various technical topics, sometimes related to DevOps and SRE
 
-:bar_chart:  There are currently **2610** exercises and questions
+:bar_chart:  There are currently **2619** exercises and questions
 
 :warning:  You can use these for preparing for an interview but most of the questions and exercises don't represent an actual interview. Please read [FAQ page](faq.md) for more details
 

topics/terraform/README.md

@@ -1327,6 +1327,24 @@ dynamic "tag" {
 
 #### Misc
 
+<details>
+<summary>What are meta-arguments in Terraform?</summary><br><b>
+
+Arguments that affect the lifecycle of a resources (its creation, modification, ...) and supported by Terraform regardless to the type of resource in which they are used.
+
+Some examples:
+
+* count: how many resources to create out of one definition of a resource
+* lifecycle: how to treat resource creation or removal
+
+</b></details>
+
+<details>
+<summary>What meta-arguments are you familiar with?</summary><br><b>
+
+* count: how many resources to create out of one definition of a resource
+* lifecycle: how to treat resource creation or removal
+* depends_on: create a dependency between resources
 </b></details>
 
 <details>
@@ -1367,14 +1385,9 @@ False. terraform console is ready-only.
 </b></details>
 
 <details>
-<summary>What are meta-arguments in Terraform?</summary><br><b>
-
-Arguments that affect the lifecycle of a resources (its creation, modification, ...) and supported by Terraform regardless to the type of resource in which they are used.
-
-Some examples:
+<summary>Explain what <code>depends_on</code> used for and given an example</summary><br><b>
 
-* count: how many resources to create out of one definition of a resource
-* lifecycle: how to treat resource creation or removal
+`depends_on` used to create a dependency between resources in Terraform. For example, there is an application you would like to deploy in a cluster. If the cluster isn't ready (and also managed by Terraform of course) then you can't deploy the app. In this case, you will define "depends_on" in the app configuration and its value will be the cluster resource.
 
 </b></details>
 
@@ -1636,6 +1649,24 @@ module "some_module" {
 
 </b></details>
 
+<details>
+<summary>How to manage multiple AWS accounts?</summary><br><b>
+
+One way is to define multiple different provider blocks, each with its own "assume_role"
+
+```
+provider "aws" {
+ region = "us-west-1"
+ alias = "some-region"
+
+ assume_role {
+ role_arn = "arn:aws:iam::<SOME_ACCOUNT_ID>:role/<SOME_ROLE_NAME>"
+ }
+}
+```
+
+</b></details>
+
 ### Validations
 
 <details>
@@ -1845,3 +1876,10 @@ Instead of defining tags at resource level, consider using `default_tags` as par
 If it's a matter of changing a resource name, you could make use of `terraform state mv <ORIGINAL_RESOURCE_NAME> <NEW_RESOURCE_NAME>`
 
 </b></details>
+
+<details>
+<summary>You try to deploy a cluster and an app on that cluster, but the app resource was created before the cluster. How to manage such situation?</summary><br><b>
+
+Use the meta-argument `depends_on` in the app resource definition. This way the app will depend on the cluster resource and order will be maintained in creation of the resources.
+
+</b></details>