Google Terraform Quickstart template

Use this template to easily create a new Git Repository for managing Jenkins X cloud infrastructure needs.

We recommend using Terraform to manange the infrastructure needed to run Jenkins X. There are a number of cloud resources which may need to be created such as:

• Kubernetes cluster
• Storage buckets for long term storage of logs
• IAM Bindings to manage permissions for applications using cloud resources

Jenkins X likes to use GitOps to manage the lifecycle of both infrastructure and cluster resources. This requires two Git Repositories to achieve this:

• Infrastructure git repository: infrastructure resources will be managed by Terraform and will keep resources in sync.
• Cluster git repository: the Kubernetes specific cluster resources will be managed by Jenkins X and keep resources in sync.

Prerequisites

• A Git organisation that will be used to create the GitOps repositories used for Jenkins X below.
  e.g. https://github.com/organizations/plan.

• Create a git bot user (different from your own personal user)
  e.g. https://github.com/join
  and generate a a personal access token, this will be used by Jenkins X to interact with git repositories.
  e.g. https://github.com/settings/tokens/new?scopes=repo,read:user,read:org,user:email,write:repo_hook,delete_repo,admin:repo_hook

• This bot user needs to have write permission to write to any git repository used by Jenkins X. This can be done by adding the bot user to the git organisation level or individual repositories as a collaborator
  Add the new bot user to your Git Organisation, for now give it Owner permissions, we will reduce this to member permissions soon.

• Check and install latest terraform CLI - see here
• Check and install latest jx CLI - see here
• Check and install latest gcloud CLI - see here
• Setup local gcloud auth so that Terraform can work with GCP

  gcloud auth application-default login

• Google cloud container services has to be enabled

  gcloud services enable container.googleapis.com

Git repositories

We use 2 git repositories:

• Infrastructure git repository for the Terraform configuration to setup/upgrade/modify your cloud infrastructure (kubernetes cluster, IAM accounts, IAM roles, buckets etc)
• Cluster git repository to contain the helmfile.yaml file to define the helm charts to deploy in your cluster

We use separate git repositories since the infrastructure tends to change rarely; whereas the cluster git repository changes alot (every time you add a new quickstart, import a project, release a project etc).

Often different teams look after infrastructure; or you may use tools like Terraform Cloud to process changes to infrastructure & review changes to infrastructure more closely than promotion of applications.

Getting started

Note: remember to create the Git repositories below in your Git Organisation rather than your personal Git account else this will lead to issues with ChatOps and automated registering of webhooks.

1. Create an Infrastructure git repo from this GitHub Template https://github.com/jx3-gitops-repositories/jx3-terraform-gke/generate. If you are following from the Jenkins X website then this initial step may have already happened.

   Note: Ensure Owner is the name of the Git Organisation that will hold the GitOps repositories used for Jenkins X.

2. Create a Cluster git repository; choosing your desired secrets store, either Google Secret Manager or Vault:

   • Google Secret Manager: https://github.com/jx3-gitops-repositories/jx3-gke-gsm/generate
     Note: If you choose Google Secret Manager, billing must be activated on your acccount!

- __Vault__: https://github.com/jx3-gitops-repositories/jx3-gke-vault/generate
__Note:__ Ensure **Owner** is the name of the Git Organisation that will hold the GitOps repositories used for Jenkins X.

1. You need to configure the git URL of your Cluster git repository (which contains helmfile.yaml) into the Infrastructure git repository (which contains main.tf).

So from inside a git clone of the Infrastructure git repository (which already has the files main.tf and values.auto.tfvars inside) you need to link to the other Cluster repository (which contains helmfile.yaml) by committing the required terraform values from below to your values.auto.tfvars, e.g.

cat <<EOF >> values.auto.tfvars    
jx_git_url = "https://github.com/$git_owner_from_cluster_template_above/$git_repo_from_cluster_template_above"
gcp_project = "my-gcp-project"
EOF

If using Google Secret Manager (not Vault) cluster template from above enable it for Terraform using:

cat <<EOF >> values.auto.tfvars 
gsm = true
EOF

The contents of your values.auto.tfvars file should look something like this (the last line will be omitted if not using gsm)….

resource_labels = { "provider" : "jx" }
jx_git_url = "https://github.com/myowner/myname-cluster"
gcp_project = "my-gcp-project"
gsm = true

1. commit and push any changes to your Infrastructure git repository:

git commit -a -m "fix: configure cluster repository and project"
git push

1. Now define 2 environment variables to pass the bot user and token into Terraform:

export TF_VAR_jx_bot_username=my-bot-username
export TF_VAR_jx_bot_token=my-bot-token

1. Now, initialise, plan and apply Terraform:

terraform init

terraform plan

terraform apply

Connect to the cluster

$(terraform output connect)

Tail the Jenkins X installation logs

$(terraform output follow_install_logs)

Once finished you can now move into the Jenkins X Developer namespace

jx ns jx

and create or import your applications

jx project

Terraform Inputs

For the full list of terraform inputs see the documentation for jenkins-x/terraform-google-jx

[
  {
    “cidr_block”: “0.0.0.0/0”,
    “display_name”: “any”
  }
]

Cleanup

To remove any cloud resources created here run:

terraform destroy

Contributing

When adding new variables please regenerate the markdown table

terraform-docs markdown table .

and replace the Inputs section above

Formatting

When developing please remember to format codebase before raising a pull request

terraform fmt -check -diff -recursive