Move delete cluster steps to delete-cluster page

runbooks/source/delete-cluster.html.md.erb

@@ -1,7 +1,7 @@
 ---
 title: Delete a cluster
 weight: 55
-last_reviewed_on: 2023-11-20
+last_reviewed_on: 2024-01-16
 review_in: 6 months
 ---
 
@@ -13,8 +13,8 @@ In most cases, it is recommended to pass responsibility for deleting a test clus
 
 ## Delete the cluster with Concourse `delete-cluster` pipeline
 
-We have a [dedicated pipeline](https://concourse.cloud-platform.service.justice.gov.uk/teams/main/pipelines/delete-cluster) for deleting test clusters. You can configure and trigger this pipeline
-against your test cluster for removal by utilising the associated cloud-platform cli `pipeline delete-cluster` [command](https://github.com/ministryofjustice/cloud-platform-cli/blob/19d33d6618013f0f4047a545b5f0d184d3d2fdfb/pkg/commands/pipeline.go).
+We have a [dedicated pipeline](https://concourse.cloud-platform.service.justice.gov.uk/teams/main/pipelines/delete-cluster) for deleting test clusters. 
+You can configure and trigger this pipeline against your test cluster for removal by utilising the associated cloud-platform cli `pipeline delete-cluster` [command](https://github.com/ministryofjustice/cloud-platform-cli/blob/19d33d6618013f0f4047a545b5f0d184d3d2fdfb/pkg/commands/pipeline.go).
 
 In order to use this command, ensure you have the following installed:
 
@@ -49,46 +49,65 @@ configuration updated
 started delete-cluster/delete #123
 ```
 
-## Delete the cluster locally, using the cli `cluster delete` command
+## Delete an EKS cluster manually
+
+Follow these steps, to delete the EKS cluster.
 
-To delete a cluster:
+First, set the kubectl context for the EKS cluster you are deleting. The easiest way to do this is with aws command:
 
 ```
-$ export AWS_PROFILE=moj-cp
+$ export KUBECONFIG=~/.kube/config
+$ export cluster=<cluster-name>
+$ aws eks --region eu-west-2 update-kubeconfig --name ${cluster}
 ```
 
-Start from the root directory of a working copy of the [infrastructure repo].
-
-There is a [delete-cluster command] which will handle deleting your cluster.
-
-The command is entirely non-interactive, and will not prompt you to confirm anything. It just destroys things.
+You should see this output:
 
-### First, run `make tools-shell`
+```
+Added new context arn:aws:eks:eu-west-2:754256621582:cluster/<cluster-name> to .kube/config
 
-> The delete cluster command must *always* be run in a container. This ensures that the environment of the command is fully controlled, and you don't run into problems such as the kubernetes context being changed in another window, or extra environment variables causing unwanted effects.
+```
 
-Then invoke the command like this:
+Then, from the root of a checkout of the `cloud-platform-infrastructure` repository, run
+these commands to destroy all cluster components, and delete the terraform workspace:
 
 ```
-cloud-platform cluster delete --name <cluster-nameto-be-deleted> --dry-run=false
+$ cd terraform/aws-accounts/cloud-platform-aws/vpc/eks/components
+$ terraform init
+$ terraform workspace select ${cluster}
+$ terraform destroy
 ```
-
-Run with `--dry-run=true` to do a dry run (if you don't pass a flag it will default to true), and see what commands would be executed.
-
-You can get more information using:
+> The destroy process often gets stuck on prometheus operator. If that happens, running this in a separate window usually works:
+> ```
+> kubectl -n monitoring delete job prometheus-operator-operator-cleanup
+> ```
 
 ```
-cloud-platform cluster delete --help
+$ terraform workspace select default
+$ terraform workspace delete ${cluster}
 ```
 
-If any steps fail:
+Change directories and perform the following to destroy the EKS cluster, and delete the terraform workspace.
 
-* Fix the underlying problem
-* Re-run the command
+```
+$ cd .. # working dir is now `eks`
+$ terraform init
+$ terraform workspace select ${cluster}
+$ terraform destroy
+$ terraform workspace select default
+$ terraform workspace delete ${cluster}
+```
 
-## Delete an EKS cluster manually
+Change directories and perform the following to destroy the cluster VPC, and delete the terraform workspace.
 
-The steps can be found here - [Delete an EKS Cluster]
+```
+$ cd .. # working dir is now `vpc`
+$ terraform init
+$ terraform workspace select ${cluster}
+$ terraform destroy
+$ terraform workspace select default
+$ terraform workspace delete ${cluster}
+```
 
 [infrastructure repo]: https://github.com/ministryofjustice/cloud-platform-infrastructure
 [delete-cluster command]: https://github.com/ministryofjustice/cloud-platform-cli/blob/19d33d6618013f0f4047a545b5f0d184d3d2fdfb/pkg/cluster/delete.go