Jenkins X EKS Module

This repository contains a Terraform module for creating an EKS cluster and all the necessary infrastructure to install Jenkins X via jx boot.

The module makes use of the Terraform EKS cluster Module.

What is a Terraform module
How do you use this module
FAQ: Frequently Asked Questions
- IAM Roles for Service Accounts
Development
- Releasing
How can I contribute

What is a Terraform module

A Terraform module refers to a self-contained package of Terraform configurations that are managed as a group. For more information about modules refer to the Terraform documentation.

How do you use this module

Prerequisites

This Terraform module allows you to create an EKS cluster ready for the installation of Jenkins X. You need the following binaries locally installed and configured on your PATH:

terraform (=> 0.12.17, < 0.14.0)
kubectl (>=1.10)
aws-cli
aws-iam-authenticator
wget

⚠️ Note: Support for terraform 0.13 was added in v1.5.0

Cluster provisioning

A default Jenkins X ready cluster can be provisioned by creating a main.tf file in an empty directory with the following content:

module "eks-jx" {
  source = "jenkins-x/eks-jx/aws"
}

output "jx_requirements" {
  value = module.eks-jx.jx_requirements
}

output "vault_user_id" {
  value       = module.eks-jx.vault_user_id
  description = "The Vault IAM user id"
}

output "vault_user_secret" {
  value       = module.eks-jx.vault_user_secret
  description = "The Vault IAM user secret"
}

All s3 buckets created by the module use Server-Side Encryption with Amazon S3-Managed Encryption Keys (SSE-S3) by default. You can set the value of use_kms_s3 to true to use server-side encryption with AWS KMS (SSE-KMS). If you don't specify the value of s3_kms_arn, then the default aws managed cmk is used (aws/s3)

⚠️ Note: Using AWS KMS with customer managed keys has cost considerations.

Due to the Vault issue 7450, this Terraform module needs for now to create a new IAM user for installing Vault. It also creates an IAM access key whose id and secret are defined in the output above. You need the id and secret for running jx boot.

The jx_requirements output is a helper for creating the initial input for jx boot.

If you do not want Terraform to create a new IAM user or you do not have permissions to create one, you need to provide the name of an existing IAM user.

module "eks-jx" {
  source     = "jenkins-x/eks-jx/aws"
  vault_user = "<your_vault_iam_username>"
}

You should have your AWS CLI configured correctly.

AWS_REGION

In addition, you should make sure to specify the region via the AWS_REGION environment variable. e.g. export AWS_REGION=us-east-1 and the region variable (make sure the region variable matches the environment variable)

The IAM user does not need any permissions attached to it. For more information, refer to Configuring Vault for EKS in the Jenkins X documentation.

Once you have your initial configuration, you can apply it by running:

terraform init
terraform apply

This creates an EKS cluster with all possible configuration options defaulted.

You then need to export the environment variables VAULT_AWS_ACCESS_KEY_ID and VAULT_AWS_SECRET_ACCESS_KEY.

export VAULT_AWS_ACCESS_KEY_ID=$(terraform output vault_user_id)
export VAULT_AWS_SECRET_ACCESS_KEY=$(terraform output vault_user_secret)

If you specified vault_user you need to provide the access key id and secret for the specified user.

⚠️ Note: This example is for getting up and running quickly. It is not intended for a production cluster. Refer to Production cluster considerations for things to consider when creating a production cluster.

The following sections provide a full list of configuration in- and output variables.

Inputs

Name	Description	Type	Default	Required
additional_tekton_role_policy_arns	Additional Policy ARNs to attach to Tekton IRSA Role	`list(string)`	`[]`	no
allowed_spot_instance_types	Allowed machine types for spot instances (must be same size)	`any`	`[]`	no
apex_domain	The main domain to either use directly or to configure a subdomain from	`string`	`""`	no
cluster_encryption_config	Configuration block with encryption configuration for the cluster.	list(object({ provider_key_arn = string resources = list(string) }))	`[]`	no
cluster_endpoint_private_access	Indicates whether or not the Amazon EKS private API server endpoint is enabled.	`bool`	`false`	no
cluster_endpoint_private_access_cidrs	List of CIDR blocks which can access the Amazon EKS private API server endpoint, when public access is disabled.	`list(string)`	[ "0.0.0.0/0" ]	no
cluster_endpoint_public_access	Indicates whether or not the Amazon EKS public API server endpoint is enabled.	`bool`	`true`	no
cluster_endpoint_public_access_cidrs	List of CIDR blocks which can access the Amazon EKS public API server endpoint.	`list(string)`	[ "0.0.0.0/0" ]	no
cluster_in_private_subnet	Flag to enable installation of cluster on private subnets	`bool`	`false`	no
cluster_name	Variable to provide your desired name for the cluster. The script will create a random name if this is empty	`string`	`""`	no
cluster_version	Kubernetes version to use for the EKS cluster.	`string`	n/a	yes
create_and_configure_subdomain	Flag to create an NS record set for the subdomain in the apex domain's Hosted Zone	`bool`	`false`	no
create_asm_role	Flag to control AWS Secrets Manager iam roles creation	`bool`	`false`	no
create_autoscaler_role	Flag to control cluster autoscaler iam role creation	`bool`	`true`	no
create_bucketrepo_role	Flag to control bucketrepo role	`bool`	`true`	no
create_cm_role	Flag to control cert manager iam role creation	`bool`	`true`	no
create_cmcainjector_role	Flag to control cert manager ca-injector iam role creation	`bool`	`true`	no
create_ctrlb_role	Flag to control controller build iam role creation	`bool`	`true`	no
create_eks	Controls if EKS cluster and associated resources should be created or not. If you have an existing eks cluster for jx, set it to false	`bool`	`true`	no
create_exdns_role	Flag to control external dns iam role creation	`bool`	`true`	no
create_nginx	Decides whether we want to create nginx resources using terraform or not	`bool`	`false`	no
create_nginx_namespace	Boolean to control nginx namespace creation	`bool`	`true`	no
create_pipeline_vis_role	Flag to control pipeline visualizer role	`bool`	`true`	no
create_ssm_role	Flag to control AWS Parameter Store iam roles creation	`bool`	`false`	no
create_tekton_role	Flag to control tekton iam role creation	`bool`	`true`	no
create_velero_role	Flag to control velero iam role creation	`bool`	`true`	no
create_vpc	Controls if VPC and related resources should be created. If you have an existing vpc for jx, set it to false	`bool`	`true`	no
desired_node_count	The number of worker nodes to use for the cluster	`number`	`3`	no
enable_backup	Whether or not Velero backups should be enabled	`bool`	`false`	no
enable_external_dns	Flag to enable or disable External DNS in the final `jx-requirements.yml` file	`bool`	`false`	no
enable_key_name	Flag to enable ssh key pair name	`bool`	`false`	no
enable_key_rotation	Flag to enable kms key rotation	`bool`	`true`	no
enable_logs_storage	Flag to enable or disable long term storage for logs	`bool`	`true`	no
enable_nat_gateway	Should be true if you want to provision NAT Gateways for each of your private networks	`bool`	`false`	no
enable_reports_storage	Flag to enable or disable long term storage for reports	`bool`	`true`	no
enable_repository_storage	Flag to enable or disable the repository bucket storage	`bool`	`true`	no
enable_spot_instances	Flag to enable spot instances	`bool`	`false`	no
enable_tls	Flag to enable TLS in the final `jx-requirements.yml` file	`bool`	`false`	no
enable_worker_group	Flag to enable worker group. Setting this to false will provision a node group instead	`bool`	`true`	no
enable_worker_groups_launch_template	Flag to enable Worker Group Launch Templates	`bool`	`false`	no
encrypt_volume_self	Encrypt the ebs and root volume for the self managed worker nodes. This is only valid for the worker group launch template	`bool`	`false`	no
force_destroy	Flag to determine whether storage buckets get forcefully destroyed. If set to false, empty the bucket first in the aws s3 console, else terraform destroy will fail with BucketNotEmpty error	`bool`	`false`	no
ignoreLoadBalancer	Flag to specify if jx boot will ignore loadbalancer DNS to resolve to an IP	`bool`	`false`	no
install_kuberhealthy	Flag to specify if kuberhealthy operator should be installed	`bool`	`true`	no
iops	The IOPS value	`number`	`0`	no
is_jx2	Flag to specify if jx2 related resources need to be created	`bool`	`true`	no
jx_bot_token	Bot token used to interact with the Jenkins X cluster git repository	`string`	`""`	no
jx_bot_username	Bot username used to interact with the Jenkins X cluster git repository	`string`	`""`	no
jx_git_url	URL for the Jenkins X cluster git repository	`string`	`""`	no
key_name	The ssh key pair name	`string`	`""`	no
lt_desired_nodes_per_subnet	The number of worker nodes in each Subnet (AZ) if using Launch Templates	`number`	`1`	no
lt_max_nodes_per_subnet	The maximum number of worker nodes in each Subnet (AZ) if using Launch Templates	`number`	`2`	no
lt_min_nodes_per_subnet	The minimum number of worker nodes in each Subnet (AZ) if using Launch Templates	`number`	`1`	no
manage_apex_domain	Flag to control if apex domain should be managed/updated by this module. Set this to false,if your apex domain is managed in a different AWS account or different provider	`bool`	`true`	no
manage_subdomain	Flag to control subdomain creation/management	`bool`	`true`	no
map_accounts	Additional AWS account numbers to add to the aws-auth configmap.	`list(string)`	`[]`	no
map_roles	Additional IAM roles to add to the aws-auth configmap.	list(object({ rolearn = string username = string groups = list(string) }))	`[]`	no
map_users	Additional IAM users to add to the aws-auth configmap.	list(object({ userarn = string username = string groups = list(string) }))	`[]`	no
max_node_count	The maximum number of worker nodes to use for the cluster	`number`	`5`	no
min_node_count	The minimum number of worker nodes to use for the cluster	`number`	`3`	no
nginx_chart_version	nginx chart version	`string`	n/a	yes
nginx_namespace	Name of the nginx namespace	`string`	`"nginx"`	no
nginx_release_name	Name of the nginx release name	`string`	`"nginx-ingress"`	no
nginx_values_file	Name of the values file which holds the helm chart values	`string`	`"values.yaml"`	no
node_group_ami	ami type for the node group worker intances	`string`	`"AL2_x86_64"`	no
node_group_disk_size	node group worker disk size	`string`	`"50"`	no
node_groups_managed	List of managed node groups to be created and their respective settings	map(object({ ami_type = string disk_size = number desired_capacity = number max_capacity = number min_capacity = number instance_types = list(string) launch_template_id = string launch_template_version = string k8s_labels = map(string) }))	`{}`	no
node_machine_type	The instance type to use for the cluster's worker nodes	`string`	`"m5.large"`	no
private_subnets	The private subnet CIDR block to use in the created VPC	`list(string)`	[ "10.0.4.0/24", "10.0.5.0/24", "10.0.6.0/24" ]	no
production_letsencrypt	Flag to use the production environment of letsencrypt in the `jx-requirements.yml` file	`bool`	`false`	no
public_subnets	The public subnet CIDR block to use in the created VPC	`list(string)`	[ "10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24" ]	no
region	The region to create the resources into	`string`	`"us-east-1"`	no
registry	Registry used to store images	`string`	`""`	no
s3_kms_arn	ARN of the kms key used for encrypting s3 buckets	`string`	`""`	no
single_nat_gateway	Should be true if you want to provision a single shared NAT Gateway across all of your private networks	`bool`	`false`	no
spot_price	The spot price ceiling for spot instances	`string`	`"0.1"`	no
subdomain	The subdomain to be added to the apex domain. If subdomain is set, it will be appended to the apex domain in `jx-requirements-eks.yml` file	`string`	`""`	no
subnets	The subnet ids to create EKS cluster in if create_vpc is false	`list(string)`	`[]`	no
tls_email	The email to register the LetsEncrypt certificate with. Added to the `jx-requirements.yml` file	`string`	`""`	no
use_asm	Flag to specify if AWS Secrets manager is being used	`bool`	`false`	no
use_kms_s3	Flag to determine whether kms should be used for encrypting s3 buckets	`bool`	`false`	no
use_vault	Flag to control vault resource creation	`bool`	`true`	no
vault_url	URL to an external Vault instance in case Jenkins X does not create its own system Vault	`string`	`""`	no
vault_user	The AWS IAM Username whose credentials will be used to authenticate the Vault pods against AWS	`string`	`""`	no
velero_namespace	Kubernetes namespace for Velero	`string`	`"velero"`	no
velero_schedule	The Velero backup schedule in cron notation to be set in the Velero Schedule CRD (see default-backup.yaml)	`string`	`"0 * * * *"`	no
velero_ttl	The the lifetime of a velero backup to be set in the Velero Schedule CRD (see default-backup.yaml)	`string`	`"720h0m0s"`	no
velero_username	The username to be assigned to the Velero IAM user	`string`	`"velero"`	no
volume_size	The volume size in GB	`number`	`50`	no
volume_type	The volume type to use. Can be standard, gp2 or io1	`string`	`"gp2"`	no
vpc_cidr_block	The vpc CIDR block	`string`	`"10.0.0.0/16"`	no
vpc_id	The VPC to create EKS cluster in if create_vpc is false	`string`	`""`	no
vpc_name	The name of the VPC to be created for the cluster	`string`	`"tf-vpc-eks"`	no

Outputs

Name	Description
backup_bucket_url	The bucket where backups from velero will be stored
cert_manager_iam_role	The IAM Role that the Cert Manager pod will assume to authenticate
cluster_asm_iam_role	The IAM Role that the External Secrets pod will assume to authenticate (Secrets Manager)
cluster_autoscaler_iam_role	The IAM Role that the Jenkins X UI pod will assume to authenticate
cluster_name	The name of the created cluster
cluster_oidc_issuer_url	The Cluster OIDC Issuer URL
cluster_ssm_iam_role	The IAM Role that the External Secrets pod will assume to authenticate (Parameter Store)
cm_cainjector_iam_role	The IAM Role that the CM CA Injector pod will assume to authenticate
connect	"The cluster connection string to use once Terraform apply finishes, this command is already executed as part of the apply, you may have to provide the region and profile as environment variables "
controllerbuild_iam_role	The IAM Role that the ControllerBuild pod will assume to authenticate
external_dns_iam_role	The IAM Role that the External DNS pod will assume to authenticate
jx_requirements	The jx-requirements rendered output
lts_logs_bucket	The bucket where logs from builds will be stored
lts_reports_bucket	The bucket where test reports will be stored
lts_repository_bucket	The bucket that will serve as artifacts repository
pipeline_viz_iam_role	The IAM Role that the pipeline visualizer pod will assume to authenticate
subdomain_nameservers	---------------------------------------------------------------------------- DNS ----------------------------------------------------------------------------
tekton_bot_iam_role	The IAM Role that the build pods will assume to authenticate
vault_dynamodb_table	The Vault DynamoDB table
vault_kms_unseal	The Vault KMS Key for encryption
vault_unseal_bucket	The Vault storage bucket
vault_user_id	The Vault IAM user id
vault_user_secret	The Vault IAM user secret
vpc_id	The ID of the VPC

Cluster Autoscaling

This does not automatically install cluster-autoscaler, it installs all of the prerequisite policies and roles required to install autoscaler. The actual autoscaler installation varies depending on what version of kubernetes you are using.

To install cluster autoscaler, first you will need the ARN of the cluster-autoscaler role.

You can create the following output along side your module definition to find this:

output "cluster_autoscaler_iam_role_arn" {
  value = module.eks-jx.cluster_autoscaler_iam_role.this_iam_role_arn
}

With the ARN, you may now install the cluster autoscaler using Helm.

Create the file cluster-autoscaler-values.yaml with the following content:

awsRegion: us-east-1

rbac:
  create: true
  serviceAccount: 
    name: cluster-autoscaler
  serviceAccountAnnotations:
    eks.amazonaws.com/role-arn: "arn:aws:iam::12345678910:role/tf-your-cluster-name-cluster-autoscaler"

autoDiscovery:
  clusterName: your-cluster-name
  enabled: true

image:
  repository: us.gcr.io/k8s-artifacts-prod/autoscaling/cluster-autoscaler
  tag: v1.16.6

Notice the image tag is v1.16.6 - this tag goes with clusters running Kubernetes 1.16. If you are running 1.15, 1.17, etc, you will need to find the image tag that matches your cluster version. To see available tags, visit this GCR registry

Next, you'll need to fetch the chart, apply your values using helm template and then apply the resulting Kubernetes object to your cluster.

helm fetch stable/cluster-autoscaler --untar

And then

helm template --name cluster-autoscaler --namespace kube-system ./cluster-autoscaler -f ./cluster-autoscaler-values.yaml | kubectl apply -n kube-system -f -

Long Term Storage

You can choose to create S3 buckets for long term storage of Jenkins X build artefacts with enable_logs_storage, enable_reports_storage and enable_repository_storage.

During terraform apply the enabledS3 buckets are created, and the jx_requirements output will contain the following section:

    storage:
      logs:
        enabled: ${enable_logs_storage}
        url: s3://${logs_storage_bucket}
      reports:
        enabled: ${enable_reports_storage}
        url: s3://${reports_storage_bucket}
      repository:
        enabled: ${enable_repository_storage}
        url: s3://${repository_storage_bucket}

If you just want to experiment with Jenkins X, you can set the variable force_destroy to true. This allows you to remove all generated buckets when running terraform destroy.

⚠️ Note: If you set force_destroy to false, and run a terraform destroy, it will fail. In that case empty the s3 buckets from the aws s3 console, and re run terraform destroy.

Secrets Management

Vault is the default tool used by Jenkins X for managing secrets. Part of this module's responsibilities is the creation of all resources required to run the Vault Operator. These resources are An S3 Bucket, a DynamoDB Table and a KMS Key.

You can also configure an existing Vault instance for use with Jenkins X. In this case provide the Vault URL via the vault_url input variable and follow the Jenkins X documentation around the installation of an external Vault instance.

To use other secret backends such as AWS Secrets Manager, set use_vault variable to false, and use_asm variable to true.

⚠️ Note: AWS Secrets Manager is not supported yet, but will be functional soon. The use_asm just sets the secretStorage to asm instead of vault for now.

NGINX

The module can install the nginx chart. Example can be found here. You can specify a nginx_values.yaml file or the module will use the default one stored here.

ExternalDNS

You can enable ExternalDNS with the enable_external_dns variable. This modifies the generated jx-requirements.yml file to enable External DNS when running jx boot.

If enable_external_dns is true, additional configuration is required.

If you want to use a domain with an already existing Route 53 Hosted Zone, you can provide it through the apex_domain variable:

This domain will be configured in the jx_requirements output in the following section:

    ingress:
      domain: ${domain}
      ignoreLoadBalancer: true
      externalDNS: ${enable_external_dns}

If you want to use a subdomain and have this module create and configure a new Hosted Zone with DNS delegation, you can provide the following variables:

subdomain: This subdomain is added to the apex domain and configured in the resulting jx-requirements.yml file.

create_and_configure_subdomain: This flag instructs the script to create a new Route53 Hosted Zone for your subdomain and configure DNS delegation with the apex domain.

By providing these variables, the script creates a new Route 53 HostedZone that looks like <subdomain>.<apex_domain>, then it delegates the resolving of DNS to the apex domain. This is done by creating a NS RecordSet in the apex domain's Hosted Zone with the subdomain's HostedZone nameservers.

This ensures that the newly created HostedZone for the subdomain is instantly resolvable instead of having to wait for DNS propagation.

cert-manager

You can enable cert-manager to use TLS for your cluster through LetsEncrypt with the enable_tls variable.

LetsEncrypt has two environments, staging and production.

If you use staging, you will receive self-signed certificates, but you are not rate-limited, if you use the production environment, you receive certificates signed by LetsEncrypt, but you can be rate limited.

You can choose to use the production environment with the production_letsencrypt variable:

You need to provide a valid email to register your domain in LetsEncrypt with tls_email.

Velero Backups

This module can set up the resources required for running backups with Velero on your cluster by setting the flag enable_backup to true.

Enabling backups on pre-existing clusters

If your cluster is pre-existing and already contains a namespace named velero, then enabling backups will initially fail with an error that you are trying to create a namespace which already exists.

Error: namespaces "velero" already exists

If you get this error, consider it a warning - you may then adjust accordingly by importing that namespace to be managed by Terraform, deleting the previously existing ns if it wasn't actually in use, or setting enable_backup back to false to continue managing Velero in the previous manner.

The recommended way is to import the namespace and then run another Terraform plan and apply:

terraform import module.eks-jx.module.backup.kubernetes_namespace.velero_namespace velero

Running `jx boot`

A terraform output (jx_requirements) is available after applying this Terraform module.

terraform output jx_requirements

This jx_requirements output can be used as input to Jenkins X Boot which is responsible for installing all the required Jenkins X components into the cluster created by this module.

⚠️ Note: The generated jx_requirements output is only intended for the first run of jx boot. During this first run of jx boot a git repository containing the source code for Jenkins X Boot is created. This (new) repository contains a jx-requirements.yml (which is now ahead of the jx-requirements output from terraform) used by successive runs of jx boot.

Execute:

terraform output jx_requirements > <some_empty_dir>/jx-requirements.yml
cd <some_empty_dir>
jx boot --requirements jx-requirements.yml

You are prompted for any further required configuration. The number of prompts depends on how much you have pre-configured via your Terraform variables.

❕ Remember you need to export VAULT_AWS_ACCESS_KEY_ID and VAULT_AWS_SECRET_ACCESS_KEY. See Cluster provisioning.

Production cluster considerations

The configuration, as seen in Cluster provisioning, is not suited for creating and maintaining a production Jenkins X cluster. The following is a list of considerations for a production use case.

Specify the version attribute of the module, for example:

module "eks-jx" {
  source  = "jenkins-x/eks-jx/aws"
  version = "1.0.0"
  # insert your configuration
}

output "jx_requirements" {
  value = module.eks-jx.jx_requirements
}

Specifying the version ensures that you are using a fixed version and that version upgrades cannot occur unintended.

Keep the Terraform configuration under version control by creating a dedicated repository for your cluster configuration or by adding it to an already existing infrastructure repository.
Setup a Terraform backend to securely store and share the state of your cluster. For more information refer to Configuring a Terraform backend.
Disable public API for the EKS cluster. If that is not not possible, restrict access to it by specifying the cidr blocks which can access it.

Configuring a Terraform backend

A "backend" in Terraform determines how state is loaded and how an operation such as apply is executed. By default, Terraform uses the local backend, which keeps the state of the created resources on the local file system. This is problematic since sensitive information will be stored on disk and it is not possible to share state across a team. When working with AWS a good choice for your Terraform backend is the s3 backend which stores the Terraform state in an AWS S3 bucket. The examples directory of this repository contains configuration examples for using the s3 backed.

To use the s3 backend, you will need to create the bucket upfront. You need the S3 bucket as well as a Dynamo table for state locks. You can use terraform-aws-tfstate-backend to create these required resources.

Using Spot Instances

You can save up to 90% of cost when you use Spot Instances. You just need to make sure your applications are resilient. You can set the ceiling spot_price of what you want to pay then set enable_spot_instances to true.

⚠️ Note: If the price of the instance reaches this point it will be terminated.

Worker Group Launch Templates

Worker Groups, the default worker node groups for this module, are based on an older AWS tool called "Launch Configurations" which have some limitations around Spot instances and delegating a percentage of a pool of workers to on-demand or spot instances, as well as issues when autoscaling is enabled.

The issue with autoscaling with the default worker group is that it is prone to autoscaling using Nodes from only a single AZ. AWS has a "AZRebalance" job that can run to help with this, but it is aggressive in removing nodes.

All of these issues can be resolved by using Worker Group Launch Templates instead, configured with a template for each Availability Zone. Using an ASG for each AZ bypasses the autoscaling issues in AWS. Furthermore, we are also able to specify several types of machines that are suitable for spot instances rather than just one. Using only one often results in Spot instances not being able to be provisioned, and this greatly reduces the occurence of this happening, as well as allowing for lower spot prices.

Enabling Worker Group Launch Templates

To use the Worker Group Launch Template, set the variable enable_worker_groups_launch_template to true, and define an array of instance types allowed.

When using autoscaling with Launch Templates per AZ, the min and max number of nodes is per zone. These values can be adjusted by using the variables lt_desired_nodes_per_subnet, lt_min_nodes_per_subnet, and lt_max_nodes_per_subnet

module "eks-jx" {
  source  = "jenkins-x/eks-jx/aws"
  enable_worker_groups_launch_template = true
  allowed_spot_instance_types          = ["m5.large", "m5a.large", "m5d.large", "m5ad.large", "t3.large", "t3a.large"]
  lt_desired_nodes_per_subnet          = 2
  lt_min_nodes_per_subnet              = 2
  lt_max_nodes_per_subnet              = 3
}

Transitioning from Worker Groups to Worker Groups Launch Templates

In order to prevent any interruption to service, you'll first want to enable Worker Group Launch Templates.

Once you've verified that you are able to see the new Nodes created by the Launch Templates by running kubectl get nodes, then you can remove the older Worker Group.

To remove the older worker group, it's recommended to first scale down to zero nodes, one at a time, by adjusting the min/max node capacity. Once you've scaled down to zero nodes for the original worker group, and your workloads have been scheduled on nodes created by the launch templates you can set enable_worker_group to false.

module "eks-jx" { source = "jenkins-x/eks-jx/aws" enable_worker_group = false enable_worker_groups_launch_template = true allowed_spot_instance_types = ["m5.large", "m5a.large", "m5d.large", "m5ad.large", "t3.large", "t3a.large"] lt_desired_nodes_per_subnet = 2 lt_min_nodes_per_subnet = 2 lt_max_nodes_per_subnet = 3 }

EKS node groups

This module provisions self-managed worker nodes by default.

If you want AWS to manage the provisioning and lifecycle of worker nodes for EKS, you can opt for managed node groups.

They have the added benefit of running the latest Amazon EKS-optimized AMIs and gracefully drain nodes before termination to ensure that your applications stay available.

In order to provision EKS node groups create a main.tf with the following content:

module "eks-jx" {
  source  = "jenkins-x/eks-jx/aws"
  enable_worker_group = false
}

output "jx_requirements" {
  value = module.eks-jx.jx_requirements
}

output "vault_user_id" {
  value       = module.eks-jx.vault_user_id
  description = "The Vault IAM user id"
}

output "vault_user_secret" {
  value       = module.eks-jx.vault_user_secret
  description = "The Vault IAM user secret"
}

Note: EKS node groups now support using spot instances and launch templates (will be set accordingly with the use of the enable_spot_instances variable)

Custom EKS node groups

A single node group will be created by default when using EKS node groups. Supply values for the node_groups_managed variable to override this behaviour:

module "eks-jx" {
  source  = "jenkins-x/eks-jx/aws"
  enable_worker_group = false
  node_groups_managed = {
    node-group-name = {
      ami_type                = "AL2_x86_64"
      disk_size               = 50
      desired_capacity        = 3
      max_capacity            = 5
      min_capacity            = 3
      instance_types          = [ "m5.large" ]
      launce_template_id      = null
      launch_template_version = null
      
      k8s_labels = {
        purpose = "application"
      }
    },
    second-node-group-name = {
      # ...
    },
    # ...
  }
}

One can use launch templates with node groups by specifying the template id and version in the parameters.

resource "aws_launch_template" "foo" {
  name = "foo"
  # ...
}

module "eks-jx" {
  source  = "jenkins-x/eks-jx/aws"
  enable_worker_group = false
  node_groups_managed = {
    node-group-name = {
      ami_type                = "AL2_x86_64"
      disk_size               = 50
      desired_capacity        = 3
      max_capacity            = 5
      min_capacity            = 3
      instance_types          = [ "m5.large" ]
      launce_template_id      = aws_launch_template.foo.id
      launch_template_version = aws_launch_template.foo.latest_version
      
      k8s_labels = {
        purpose = "application"
      }
    },
    second-node-group-name = {
      # ...
    },
    # ...
  }
}

⚠️ Note: EKS node groups are supported in kubernetes v1.14+ and platform version eks.3

AWS Auth

When running EKS, authentication for the cluster is controlled by a configmap called aws-auth. By default, that should look something like this:

apiVersion: v1
data:
  mapAccounts: |
    []
  mapRoles: |
    - "groups":
      - "system:bootstrappers"
      - "system:nodes"
      "rolearn": "arn:aws:iam::777777777777:role/project-eks-12345"
      "username": "system:node:{{EC2PrivateDNSName}}"
  mapUsers: |
    []
kind: ConfigMap
metadata:
  name: aws-auth
  namespace: kube-system

When using this Terraform module, this AWS Auth configmap is generated for you via the EKS module that is used internally. Additional users, roles, and accounts may be mapped into this config map by providing the variables map_users, map_roles or map_accounts respectively.

`map_users`

To add an additional AWS IAM user named "patrick", you can create an aws_iam_user resource, and then use the map_users variable to allow Patrick to access EKS:

resource "aws_iam_user" "patrick" {
  name = "patrick"
}

module "eks-jx" {
  source  = "jenkins-x/eks-jx/aws"
  map_users = [
    {
      userarn  = aws_iam_user.patrick.arn
      username = aws_iam_user.patrick.name
      groups   = ["system:masters"]
    }
  ]
}

`map_roles`

To map additional roles to the AWS Auth ConfigMap, use map_roles:

module "eks-jx" {
  source  = "jenkins-x/eks-jx/aws"
  map_roles = [
    {
      rolearn  = "arn:aws:iam::66666666666:role/role1"
      username = "role1"
      groups   = ["system:masters"]
    },
  ]
}

`map_accounts`

To map additional accounts to the AWS Auth ConfigMap, use map_accounts:

module "eks-jx" {
  source  = "jenkins-x/eks-jx/aws"
  map_accounts = [
    "777777777777",
    "888888888888",
  ]
}

Using SSH Key Pair

Import a key pair or use an existing one and take note of the name. Set key_name and set enable_key_name to true.

Using different EBS Volume type and size

Set volume_type to either standard, gp2 or io1 and volume_size to the desired size in GB. If chosing io1 set desired iops.

Resizing a disk on existing nodes

The existing nodes needs to be terminated and replaced with new ones if disk is needed to be resized. You need to execute the following command before terraform apply in order to replace the Auto Scaling Launch Configuration.

terraform taint module.eks-jx.module.cluster.module.eks.aws_launch_configuration.workers[0]

Support for JX3

Creation of namespaces and service accounts using terraform is no longer required for JX3. To keep compatibility with JX2, a flag is_jx2 was introduced, in v1.6.0.

Existing VPC

If you want to create the cluster in an existing VPC you can specify create_vpc to false and specify where to create the clsuter with vpc_id and subnets.

Existing EKS cluster

It is very common to have another module used to create EKS clusters for all your AWS accounts, in that case, you can set create_eks and create_vpc to false and cluster_name to the id/name of the EKS cluster where jx components need to be installed in. This will prevent creating a new vpc and eks cluster for jx. There are also flags to control the creation of IAM roles. See this for a complete example.

Examples

You can find examples for different configurations in the examples folder.

Each example generates a valid jx-requirements.yml file that can be used to boot a Jenkins X cluster.

FAQ: Frequently Asked Questions

IAM Roles for Service Accounts

This module sets up a series of IAM Policies and Roles. These roles will be annotated into a few Kubernetes Service accounts. This allows us to make use of IAM Roles for Sercive Accounts to set fine-grained permissions on a pod per pod basis. There is no way to provide your own roles or define other Service Accounts by variables, but you can always modify the modules/cluster/irsa.tf Terraform file.

Development

Releasing

At the moment, there is no release pipeline defined in jenkins-x.yml. A Terraform release does not require building an artifact; only a tag needs to be created and pushed. To make this task easier and there is a helper script release.sh which simplifies this process and creates the changelog as well:

./scripts/release.sh

This can be executed on demand whenever a release is required. For the script to work, the environment variable $GH_TOKEN must be exported and reference a valid GitHub API token.

How can I contribute

Contributions are very welcome! Check out the Contribution Guidelines for instructions.

Name		Name	Last commit message	Last commit date
Latest commit History 172 Commits
.github		.github
examples		examples
images		images
modules		modules
scripts		scripts
templates		templates
test		test
.gitignore		.gitignore
.releaserc		.releaserc
.shellspec		.shellspec
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
Makefile		Makefile
OWNERS		OWNERS
README.md		README.md
jenkins-x.yml		jenkins-x.yml
local.tf		local.tf
main.tf		main.tf
outputs.tf		outputs.tf
variables.tf		variables.tf
versions.tf		versions.tf

License

OnScale/terraform-aws-eks-jx

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