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README.md | ||
diagram.png | ||
gke-clusters.tf | ||
gke-hub.tf | ||
gke-nodepools.tf | ||
main.tf | ||
outputs.tf | ||
variables.tf |
README.md
GKE Multitenant Blueprint
This blueprint presents an opinionated architecture to handle multiple homogeneous GKE clusters. The general idea behind this blueprint is to deploy a single project hosting multiple clusters leveraging several useful GKE features.
The pattern used in this design is useful, for blueprint, in cases where multiple clusters host/support the same workloads, such as in the case of a multi-regional deployment. Furthermore, combined with Anthos Config Sync and proper RBAC, this architecture can be used to host multiple tenants (e.g. teams, applications) sharing the clusters.
This blueprint is used as part of the FAST GKE stage but it can also be used independently if desired.
The overall architecture is based on the following design decisions:
- All clusters are assumed to be private, therefore only VPC-native clusters are supported.
- Logging and monitoring configured to use Cloud Operations for system components and user workloads.
- GKE metering enabled by default and stored in a bigquery dataset created within the project.
- Optional GKE Fleet support with the possibility to enable any of the following features:
- Support for Config Sync, Hierarchy Controller, and Policy Controller when using Anthos Config Management.
- Groups for GKE can be enabled to facilitate the creation of flexible RBAC policies referencing group principals.
- Support for application layer secret encryption.
- Support to customize peering configuration of the control plane VPC (e.g. to import/export routes to the peered network)
- Some features are enabled by default in all clusters:
Basic usage
The following example shows how to deploy two clusters and one node pool for each
locals {
cluster_defaults = {
private_cluster_config = {
enable_private_endpoint = true
master_global_access = true
}
}
subnet_self_links = {
ew1 = "projects/prj-host/regions/europe-west1/subnetworks/gke-0"
ew3 = "projects/prj-host/regions/europe-west3/subnetworks/gke-0"
}
}
module "gke-fleet" {
source = "./fabric/blueprints/gke/multitenant-fleet/"
project_id = var.project_id
billing_account_id = var.billing_account_id
folder_id = var.folder_id
prefix = "myprefix"
group_iam = {
"gke-admin@example.com" = [
"roles/container.admin"
]
}
iam = {
"roles/container.clusterAdmin" = [
"cicd@my-cicd-project.iam.gserviceaccount.com"
]
}
clusters = {
cluster-0 = {
location = "europe-west1"
private_cluster_config = local.cluster_defaults.private_cluster_config
vpc_config = {
subnetwork = local.subnet_self_links.ew1
master_ipv4_cidr_block = "172.16.10.0/28"
}
}
cluster-1 = {
location = "europe-west3"
private_cluster_config = local.cluster_defaults.private_cluster_config
vpc_config = {
subnetwork = local.subnet_self_links.ew3
master_ipv4_cidr_block = "172.16.20.0/28"
}
}
}
nodepools = {
cluster-0 = {
nodepool-0 = {
node_config = {
disk_type = "pd-balanced"
machine_type = "n2-standard-4"
spot = true
}
}
}
cluster-1 = {
nodepool-0 = {
node_config = {
disk_type = "pd-balanced"
machine_type = "n2-standard-4"
}
}
}
}
vpc_config = {
host_project_id = "my-host-project-id"
vpc_self_link = "projects/prj-host/global/networks/prod-0"
}
}
# tftest modules=7 resources=27
GKE Fleet
This example deploys two clusters and configures several GKE Fleet features:
- Enables multi-cluster ingress and sets the configuration cluster to be
cluster-eu1
. - Enables Multi-cluster services and assigns the required roles to its service accounts.
- A
default
Config Management template is created with binary authorization, config sync enabled with a git repository, hierarchy controller, and policy controller. - The two clusters are configured to use the
default
Config Management template.
locals {
subnet_self_links = {
ew1 = "projects/prj-host/regions/europe-west1/subnetworks/gke-0"
ew3 = "projects/prj-host/regions/europe-west3/subnetworks/gke-0"
}
}
module "gke" {
source = "./fabric/blueprints/gke/multitenant-fleet/"
project_id = var.project_id
billing_account_id = var.billing_account_id
folder_id = var.folder_id
prefix = "myprefix"
clusters = {
cluster-0 = {
location = "europe-west1"
vpc_config = {
subnetwork = local.subnet_self_links.ew1
}
}
cluster-1 = {
location = "europe-west3"
vpc_config = {
subnetwork = local.subnet_self_links.ew3
}
}
}
nodepools = {
cluster-0 = {
nodepool-0 = {
node_config = {
disk_type = "pd-balanced"
machine_type = "n2-standard-4"
spot = true
}
}
}
cluster-1 = {
nodepool-0 = {
node_config = {
disk_type = "pd-balanced"
machine_type = "n2-standard-4"
}
}
}
}
fleet_features = {
appdevexperience = false
configmanagement = true
identityservice = true
multiclusteringress = "cluster-0"
multiclusterservicediscovery = true
servicemesh = true
}
fleet_workload_identity = true
fleet_configmanagement_templates = {
default = {
binauthz = true
config_sync = {
git = {
gcp_service_account_email = null
https_proxy = null
policy_dir = "configsync"
secret_type = "none"
source_format = "hierarchy"
sync_branch = "main"
sync_repo = "https://github.com/myorg/myrepo"
sync_rev = null
sync_wait_secs = null
}
prevent_drift = true
source_format = "hierarchy"
}
hierarchy_controller = {
enable_hierarchical_resource_quota = true
enable_pod_tree_labels = true
}
policy_controller = {
audit_interval_seconds = 30
exemptable_namespaces = ["kube-system"]
log_denies_enabled = true
referential_rules_enabled = true
template_library_installed = true
}
version = "1.10.2"
}
}
fleet_configmanagement_clusters = {
default = ["cluster-0", "cluster-1"]
}
vpc_config = {
host_project_id = "my-host-project-id"
vpc_self_link = "projects/prj-host/global/networks/prod-0"
}
}
# tftest modules=8 resources=38
Files
name | description | modules |
---|---|---|
gke-clusters.tf | GKE clusters. | gke-cluster |
gke-hub.tf | GKE hub configuration. | gke-hub |
gke-nodepools.tf | GKE nodepools. | gke-nodepool |
main.tf | Project and usage dataset. | bigquery-dataset · project |
outputs.tf | Output variables. | |
variables.tf | Module variables. |
Variables
name | description | type | required | default |
---|---|---|---|---|
billing_account_id | Billing account id. | string |
✓ | |
folder_id | Folder used for the GKE project in folders/nnnnnnnnnnn format. | string |
✓ | |
prefix | Prefix used for resource names. | string |
✓ | |
project_id | ID of the project that will contain all the clusters. | string |
✓ | |
vpc_config | Shared VPC project and VPC details. | object({…}) |
✓ | |
clusters | Clusters configuration. Refer to the gke-cluster module for type details. | map(object({…})) |
{} |
|
fleet_configmanagement_clusters | Config management features enabled on specific sets of member clusters, in config name => [cluster name] format. | map(list(string)) |
{} |
|
fleet_configmanagement_templates | Sets of config management configurations that can be applied to member clusters, in config name => {options} format. | map(object({…})) |
{} |
|
fleet_features | Enable and configue fleet features. Set to null to disable GKE Hub if fleet workload identity is not used. | object({…}) |
null |
|
fleet_workload_identity | Use Fleet Workload Identity for clusters. Enables GKE Hub if set to true. | bool |
false |
|
group_iam | Project-level IAM bindings for groups. Use group emails as keys, list of roles as values. | map(list(string)) |
{} |
|
iam | Project-level authoritative IAM bindings for users and service accounts in {ROLE => [MEMBERS]} format. | map(list(string)) |
{} |
|
labels | Project-level labels. | map(string) |
{} |
|
nodepools | Nodepools configuration. Refer to the gke-nodepool module for type details. | map(map(object({…}))) |
{} |
|
project_services | Additional project services to enable. | list(string) |
[] |
Outputs
name | description | sensitive |
---|---|---|
cluster_ids | Cluster ids. | |
clusters | Cluster resources. | |
project_id | GKE project id. |