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.

3. 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

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

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

5. 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

6. 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

Name	Description	Type	Default	Required
apex_domain_integration_enabled	Add recordsets from a subdomain to a parent / apex domain	bool	true	no
cluster_location	The location (region or zone) in which the cluster master will be created. If you specify a zone (such as us-central1-a), the cluster will be a zonal cluster with a single cluster master. If you specify a region (such as us-west1), the cluster will be a regional cluster with multiple masters spread across zones in the region	string	"us-central1-a"	no
cluster_name	Name of the Kubernetes cluster to create	string	""	no
master_authorized_networks	List of master authorized networks. If none are provided, disallow external access (except the cluster node IPs, which GKE automatically allowlists).	list(object({ cidr_block = string, display_name = string }))	[]	no
force_destroy	Flag to determine whether storage buckets get forcefully destroyed	bool	false	no
gcp_project	The name of the GCP project to use	string	n/a	yes
gsm	Enables Google Secrets Manager, not available with JX2	bool	false	no
jx_bot_token	Bot token used to interact with the Jenkins X cluster git repository	string	n/a	yes
jx_bot_username	Bot username used to interact with the Jenkins X cluster git repository	string	n/a	yes
jx_git_url	URL for the Jenins X cluster git repository	string	n/a	yes
lets_encrypt_production	Flag to determine wether or not to use the Let's Encrypt production server.	bool	true	no
autoscaler_max_node_count	Maximum number of cluster nodes	number	5	no
autoscaler_min_node_count	Minimum number of cluster nodes	number	3	no
initial_primary_node_pool_node_count	initial node count for the primary pool	number	3	no
initial_cluster_node_count	initial node count for the cluster	number	3	no
node_disk_size	Node disk size in GB	string	"100"	no
node_disk_type	Node disk type, either pd-standard or pd-ssd	string	"pd-standard"	no
node_machine_type	Node type for the Kubernetes cluster	string	"n1-standard-2"	no
parent_domain	The parent domain to be allocated to the cluster	string	""	no
parent_domain_gcp_project	The GCP project the parent domain is managed by, used to write recordsets for a subdomain if set. Defaults to current project.	string	""	no
resource_labels	Set of labels to be applied to the cluster	map(string)	{}	no
subdomain	Optional sub domain for the installation	string	""	no
tls_email	Email used by Let's Encrypt. Required for TLS when parent_domain is specified	string	""	no

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