Terraform makes it fairly easy to delete resources using the destroy command. This is very useful in testing and
pre-prod environments, but can also be dangerous in production environments, because if you delete resources, there
is no undo. Therefore, be extra sure and careful with where you run destroy so you don't accidentally end up
deleting something you'll very much regret (e.g., a production database). Also, as explained in the rest of this guide,
we put a few features in place that make deletion harder (read: a bit more annoying to do) to prevent you from
accidentally shooting yourself in the foot.
Pre-requisite: force_destroy on S3 buckets
By default, if your Terraform code includes an S3 bucket, when you run terraform destroy, if that bucket contains
any content, Terraform will not delete the bucket and instead will give you an error like this:
bucketNotEmpty: The bucket you tried todeleteis not empty. You must deleteall versions in the bucket.
This is a safety mechanism to ensure that you don't accidentally delete your data.
If you are absolutely sure you want to delete the contents of an S3 bucket (remember, there's no undo!!!), all the
modules that use S3 buckets expose a force_destroy setting that you can set to true in your terragrunt.hcl
files to tell that module to delete the contents of the bucket when you run destroy. Here's a partial list of modules
that expose this variable (note, you may not have all of these in your Reference Architecture!):
networking/alb
mgmt/openvpn-server
security/cloudtrail
services/asg-service
services/ecs-service
services/static-website
data-stores/zookeeper
lambda/s3-image-processing
Pre-requisite: disable Terragrunt prevent_destroy
Terragrunt supports a prevent_destroy flag that you can
set to true in your terragrunt.hcl to protect valuable resources from accidental deletion (e.g., your database
and VPC). By default, we have prevent_destroy set on a few modules in the prod environment (namely, the production
data stores and VPCs). If you run terragrunt destroy on a module with this setting, Terragrunt will simply log a
warning and exit without deleting anything.
If you are absolutely sure you want to run destroy on this module (remember, there's no undo!), you'll need to
set prevent_destroy = false in the corresponding terragrunt.hcl file.
Important exception: for multi-account deployments, we set prevent_destroy = true on the iam-cross-account
module. This module creates the IAM Roles you use to authenticate to an AWS account, so you should NOT set
prevent_destroy = false on this module and do NOT run destroy on it, or you'll be locked out of the account!
Pre-requisite: understand module dependencies
Important note: some of your Terraform modules may depend on other ones! For example, most modules depend on the vpc
module, fetching information about the VPC using either the
terraform_remote_state or
aws_vpc data source. If you run destroy on your vpcbefore the modules that depend on it, then any command you try to run on those other modules will fail, as their
data sources will no longer be able to fetch the VPC info!
Therefore, you should only destroy a module if you're sure no other module depends on it! Terraform does not provide
an easy way to track these sorts of dependencies. Your best bet is to manually track your dependencies using the
dependencies feature of Terragrunt and to
only undeploy modules that don't appear in the dependencies list of any other deployed module.
Undeploying a single module
Now that all the pre-requisites are out of the way, if you are absolutely sure you want to run destroy on a single
module (remember, there's no undo!), just go into that module's folder and run terragrunt destroy. For example, to
undeploy the sample-app-frontend service in the stage environment, you'd run:
cd stage/us-east-1/stage/services/sample-app-frontend
terragrunt destroy
Undeploying multiple modules or an entire environment
If you are absolutely sure you want to run destroy on multiple modules or an entire environment (remember, there's
no undo!), you can use the destroy-all command. For example, to undeploy the entire staging environment, you'd run:
cdstageterragruntdestroy-all
Terragrunt will then run terragrunt destroy in each subfolder of the current working directory, processing them in
reverse order based on the dependencies you
define in the terragrunt.hcl files.
To avoid interactive prompts from Terragrunt (use very carefully!!), add the --terragrunt-non-interactive flag:
cd stage
terragrunt destroy-all--terragrunt-non-interactive
To undeploy everything except a couple specific subfolders, add the --terragrunt-exclude-dir flag. For example, to
run destroy in each subfolder of the stage environment except MySQL and Redis, you'd run:
cd stage
terragrunt destroy-all \
--terragrunt-exclude-dir stage/us-east-1/stage/data-stores/mysql \
--terragrunt-exclude-dir stage/us-east-1/stage/data-stores/redis
Removing the terraform state
NOTE: Deleting state means that you lose the ability to manage your current terraform resources! Be sure to only
delete once you have confirmed all resources are destroyed.
Once all the resources for an environment have been destroyed, you can remove the state objects managed by terragrunt.
The reference architecture manages state for each environment in an S3 bucket in each environment's AWS account.
Additionally, to prevent concurrent access to the state, it also utilizes a DynamoDB table to manage locks.
To delete the state objects, login to the console and look for the S3 bucket in the environment you wish to undeploy. It
should begin with acme-multi-account and end with terraform-state. Also look for a DynamoDB
table named terraform-locks. You can safely remove both once you have confirmed all the resources have been
destroyed successfully.
Known errors
There are a few reasons your call to destroy may fail:
Terraform bugs: Terraform has a couple bugs (18197 and
17862) that may give the following error when you run
destroy:
variable "xxx" is nil, but noerror was reported
This usually happens when the module already had destroy called on it previously and you re-run destroy. In
this case, your best bet is to skip over that module with the --terragrunt-exclude-dir (as shown in the previous)
section.
Missing dependencies: If you delete modules in the wrong order, as discussed in the Pre-requisite: understand
module dependencies section, then when you try to destroy on a
module that's missing one of its dependencies, you'll get an error about a data source being unable to find the
data it's looking for. Unfortunately, there are no good solutions in this scenario, just a few nasty workarounds:
Run apply to temporarily bring back the dependencies.
Update the code to temporarily remove the dependencies and replace them with some mock data.
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class=\"preview__body--title\" id=\"undeploying-the-reference-architecture\">Undeploying the Reference Architecture</h1><div class=\"preview__body--border\"></div><p>Sometimes, you'll need to undeploy some or all of the environments in the Reference Architecture. This is a guide on\nhow to do that.</p>\n<ol>\n<li><a href=\"#before-you-get-started\" class=\"preview__body--description--blue\">Before you get started</a></li>\n<li><a href=\"#pre-requisite-force_destroy-on-S3-buckets\" class=\"preview__body--description--blue\">Pre-requisite: force_destroy on S3 buckets</a></li>\n<li><a href=\"#pre-requisite-disable-terragrunt-prevent_destroy\" class=\"preview__body--description--blue\">Pre-requisite: disable Terragrunt prevent_destroy</a></li>\n<li><a href=\"#pre-requisite-understand-module-dependencies\" class=\"preview__body--description--blue\">Pre-requisite: understand module dependencies</a></li>\n<li><a href=\"#undeploying-a-single-module\" class=\"preview__body--description--blue\">Undeploying a single module</a></li>\n<li><a href=\"#undeploying-multiple-modules-or-an-entire-environment\" class=\"preview__body--description--blue\">Undeploying multiple modules or an entire environment</a></li>\n<li><a href=\"#removing-the-terraform-state\" class=\"preview__body--description--blue\">Removing the terraform state</a></li>\n<li><a href=\"#known-errors\" class=\"preview__body--description--blue\">Known errors</a></li>\n<li><a href=\"#next-steps\" class=\"preview__body--description--blue\">Next steps</a></li>\n</ol>\n<h2 class=\"preview__body--subtitle\" id=\"before-you-get-started\">Before you get started</h2>\n<p>Terraform makes it fairly easy to delete resources using the <code>destroy</code> command. This is very useful in testing and\npre-prod environments, but can also be dangerous in production environments, because if you delete resources, <strong>there\nis no undo</strong>. Therefore, be extra sure and careful with where you run <code>destroy</code> so you don't accidentally end up\ndeleting something you'll very much regret (e.g., a production database). Also, as explained in the rest of this guide,\nwe put a few features in place that make deletion harder (read: a bit more annoying to do) to prevent you from\naccidentally shooting yourself in the foot.</p>\n<h2 class=\"preview__body--subtitle\" id=\"pre-requisite-force-destroy-on-s-3-buckets\">Pre-requisite: force_destroy on S3 buckets</h2>\n<p>By default, if your Terraform code includes an S3 bucket, when you run <code>terraform destroy</code>, if that bucket contains\nany content, Terraform will <em>not</em> delete the bucket and instead will give you an error like this:</p>\n<pre>bucketNotEmpty: The bucket you tried <span class=\"hljs-keyword\">to</span> <span class=\"hljs-keyword\">delete</span> <span class=\"hljs-keyword\">is</span> not <span class=\"hljs-built_in\">empty</span>. You must <span class=\"hljs-keyword\">delete</span> <span class=\"hljs-keyword\">all</span> versions in the bucket.\n</pre>\n<p>This is a safety mechanism to ensure that you don't accidentally delete your data.</p>\n<p><em>If you are absolutely sure you want to delete the contents of an S3 bucket</em> (remember, there's no undo!!!), all the\nmodules that use S3 buckets expose a <code>force_destroy</code> setting that you can set to <code>true</code> in your <code>terragrunt.hcl</code>\nfiles to tell that module to delete the contents of the bucket when you run <code>destroy</code>. Here's a partial list of modules\nthat expose this variable (note, you may not have all of these in your Reference Architecture!):</p>\n<ul>\n<li>networking/alb</li>\n<li>mgmt/openvpn-server</li>\n<li>security/cloudtrail</li>\n<li>services/asg-service</li>\n<li>services/ecs-service</li>\n<li>services/static-website</li>\n<li>data-stores/zookeeper</li>\n<li>lambda/s3-image-processing</li>\n</ul>\n<h2 class=\"preview__body--subtitle\" id=\"pre-requisite-disable-terragrunt-prevent-destroy\">Pre-requisite: disable Terragrunt prevent_destroy</h2>\n<p>Terragrunt supports a <a href=\"/repos/terragrunt#prevent_destroy\" class=\"preview__body--description--blue\">prevent_destroy</a> flag that you can\nset to <code>true</code> in your <code>terragrunt.hcl</code> to protect valuable resources from accidental deletion (e.g., your database\nand VPC). By default, we have <code>prevent_destroy</code> set on a few modules in the prod environment (namely, the production\ndata stores and VPCs). If you run <code>terragrunt destroy</code> on a module with this setting, Terragrunt will simply log a\nwarning and exit without deleting anything.</p>\n<p><em>If you are absolutely sure you want to run destroy on this module</em> (remember, there's no undo!), you'll need to\nset <code>prevent_destroy = false</code> in the corresponding <code>terragrunt.hcl</code> file.</p>\n<p><strong>Important exception</strong>: for multi-account deployments, we set <code>prevent_destroy = true</code> on the <code>iam-cross-account</code>\nmodule. This module creates the IAM Roles you use to authenticate to an AWS account, so you should <strong>NOT</strong> set\n<code>prevent_destroy = false</code> on this module and do <strong>NOT</strong> run <code>destroy</code> on it, or you'll be locked out of the account!</p>\n<h2 class=\"preview__body--subtitle\" id=\"pre-requisite-understand-module-dependencies\">Pre-requisite: understand module dependencies</h2>\n<p>Important note: some of your Terraform modules may depend on other ones! For example, most modules depend on the <code>vpc</code>\nmodule, fetching information about the VPC using either the\n<a href=\"https://www.terraform.io/docs/providers/terraform/d/remote_state.html\" class=\"preview__body--description--blue\" target=\"_blank\">terraform_remote_state</a> or\n<a href=\"https://www.terraform.io/docs/providers/aws/d/vpc.html\" class=\"preview__body--description--blue\" target=\"_blank\">aws_vpc</a> data source. If you run <code>destroy</code> on your <code>vpc</code>\n<em>before</em> the modules that depend on it, then any command you try to run on those other modules will fail, as their\ndata sources will no longer be able to fetch the VPC info!</p>\n<p>Therefore, you should only destroy a module if you're sure no other module depends on it! Terraform does not provide\nan easy way to track these sorts of dependencies. Your best bet is to manually track your dependencies using the\n<a href=\"/repos/terragrunt#dependencies-between-modules\" class=\"preview__body--description--blue\">dependencies feature of Terragrunt</a> and to\nonly undeploy modules that don't appear in the <code>dependencies</code> list of any other deployed module.</p>\n<h2 class=\"preview__body--subtitle\" id=\"undeploying-a-single-module\">Undeploying a single module</h2>\n<p>Now that all the pre-requisites are out of the way, <em>if you are absolutely sure you want to run destroy on a single\nmodule</em> (remember, there's no undo!), just go into that module's folder and run <code>terragrunt destroy</code>. For example, to\nundeploy the sample-app-frontend service in the <code>stage</code> environment, you'd run:</p>\n<pre><span class=\"hljs-keyword\">cd</span> stage/<span class=\"hljs-keyword\">us</span>-east-1/stage/services/<span class=\"hljs-keyword\">sample</span>-<span class=\"hljs-keyword\">app</span>-frontend\nterragrunt destroy\n</pre>\n<h2 class=\"preview__body--subtitle\" id=\"undeploying-multiple-modules-or-an-entire-environment\">Undeploying multiple modules or an entire environment</h2>\n<p><em>If you are absolutely sure you want to run destroy on multiple modules or an entire environment</em> (remember, there's\nno undo!), you can use the <code>destroy-all</code> command. For example, to undeploy the entire staging environment, you'd run:</p>\n<pre><span class=\"hljs-attr\">cd</span> <span class=\"hljs-string\">stage</span>\n<span class=\"hljs-attr\">terragrunt</span> <span class=\"hljs-string\">destroy-all</span>\n</pre>\n<p>Terragrunt will then run <code>terragrunt destroy</code> in each subfolder of the current working directory, processing them in\nreverse order based on the <a href=\"/repos/terragrunt#dependencies-between-modules\" class=\"preview__body--description--blue\">dependencies</a> you\ndefine in the <code>terragrunt.hcl</code> files.</p>\n<p>To avoid interactive prompts from Terragrunt (use very carefully!!), add the <code>--terragrunt-non-interactive</code> flag:</p>\n<pre>cd stage\nterragrunt destroy-<span class=\"hljs-keyword\">all</span> <span class=\"hljs-comment\">--terragrunt-non-interactive</span>\n</pre>\n<p>To undeploy everything except a couple specific subfolders, add the <code>--terragrunt-exclude-dir</code> flag. For example, to\nrun <code>destroy</code> in each subfolder of the <code>stage</code> environment except MySQL and Redis, you'd run:</p>\n<pre>cd stage\nterragrunt destroy-all \\\n --terragrunt-<span class=\"hljs-keyword\">exclude</span>-dir stage<span class=\"hljs-regexp\">/us-east-1/</span>stage<span class=\"hljs-regexp\">/data-stores/my</span>sql \\ \n --terragrunt-<span class=\"hljs-keyword\">exclude</span>-dir stage<span class=\"hljs-regexp\">/us-east-1/</span>stage<span class=\"hljs-regexp\">/data-stores/</span>redis \n</pre>\n<h2 class=\"preview__body--subtitle\" id=\"removing-the-terraform-state\">Removing the terraform state</h2>\n<p><strong>NOTE: Deleting state means that you lose the ability to manage your current terraform resources! Be sure to only\ndelete once you have confirmed all resources are destroyed.</strong></p>\n<p>Once all the resources for an environment have been destroyed, you can remove the state objects managed by <code>terragrunt</code>.\nThe reference architecture manages state for each environment in an S3 bucket in each environment's AWS account.\nAdditionally, to prevent concurrent access to the state, it also utilizes a DynamoDB table to manage locks.</p>\n<p>To delete the state objects, login to the console and look for the S3 bucket in the environment you wish to undeploy. It\nshould begin with <code>acme-multi-account</code> and end with <code>terraform-state</code>. Also look for a DynamoDB\ntable named <code>terraform-locks</code>. You can safely remove both <strong>once you have confirmed all the resources have been\ndestroyed successfully</strong>.</p>\n<h2 class=\"preview__body--subtitle\" id=\"known-errors\">Known errors</h2>\n<p>There are a few reasons your call to <code>destroy</code> may fail:</p>\n<ol>\n<li>\n<p><strong>Terraform bugs</strong>: Terraform has a couple bugs (<a href=\"https://github.com/hashicorp/terraform/issues/18197\" class=\"preview__body--description--blue\" target=\"_blank\">18197</a> and\n<a href=\"https://github.com/hashicorp/terraform/issues/17862\" class=\"preview__body--description--blue\" target=\"_blank\">17862</a>) that may give the following error when you run\n<code>destroy</code>:</p>\n<pre>variable <span class=\"hljs-string\">\"xxx\"</span> is <span class=\"hljs-literal\">nil</span>, but <span class=\"hljs-literal\">no</span> <span class=\"hljs-builtin-name\">error</span> was reported\n</pre>\n<p>This usually happens when the module already had <code>destroy</code> called on it previously and you re-run <code>destroy</code>. In\nthis case, your best bet is to skip over that module with the <code>--terragrunt-exclude-dir</code> (as shown in the previous)\nsection.</p>\n</li>\n<li>\n<p><strong>Missing dependencies</strong>: If you delete modules in the wrong order, as discussed in the <a href=\"#pre-requisite-understand-module-dependencies\" class=\"preview__body--description--blue\">Pre-requisite: understand\nmodule dependencies</a> section, then when you try to <code>destroy</code> on a\nmodule that's missing one of its dependencies, you'll get an error about a <code>data</code> source being unable to find the\ndata it's looking for. Unfortunately, there are no good solutions in this scenario, just a few nasty workarounds:</p>\n<ol>\n<li>Run <code>apply</code> to temporarily bring back the dependencies.</li>\n<li>Update the code to temporarily remove the dependencies and replace them with some mock data.</li>\n</ol>\n</li>\n</ol>\n<h2 class=\"preview__body--subtitle\" id=\"next-steps\">Next steps</h2>\n<p>Now that you know how to undeploy the Reference Architecture, let's take a look at <a href=\"/repos/v0.0.1-01172020/infrastructure-live-multi-account-acme/_docs/15-adding-new-environments-regions-and-accounts.md\" class=\"preview__body--description--blue\">how to add a new environment,\nregion, or account\nto the Reference Architecture</a>.</p>\n","repoName":"infrastructure-live-multi-account-acme","repoRef":"v0.0.1-01172020","serviceDescriptor":{"serviceName":"Multi-account Reference Architecture","serviceRepoName":"infrastructure-live-multi-account-acme","serviceRepoOrg":"gruntwork-io","cloudProviders":["aws"],"description":"End-to-end tech stack designed to deploy into multiple AWS accounts. Includes VPCs, EKS, ALBs, CI / CD, monitoring, alerting, VPN, DNS, and more.","imageUrl":"grunt.png","licenseType":"subscriber","technologies":["Terraform","Go","Bash","Python"],"compliance":[],"tags":[""]},"serviceCategoryName":"Reference Architecture","fileName":"14-undeploying-the-reference-architecture.md","filePath":"/_docs/14-undeploying-the-reference-architecture.md","title":"Repo Browser: Multi-account Reference Architecture","description":"Browse the repos in the Gruntwork Infrastructure as Code Library."}
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