This module handles opinionated Google Cloud Platform Kubernetes Engine cluster creation and configuration with Node Pools, IP MASQ, Network Policy, etc. The resources/services/activations/deletions that this module will create/trigger are:
- Create a GKE cluster with the provided addons
- Create GKE Node Pool(s) with provided configuration and attach to cluster
- Replace the default kube-dns configmap if
stub_domainsare provided - Activate network policy if
network_policyis true - Add
ip-masq-agentconfigmap with providednon_masquerade_cidrsifconfigure_ip_masqis true
Sub modules are provided for creating private clusters, beta private clusters, and beta public clusters as well. Beta sub modules allow for the use of various GKE beta features. See the modules directory for the various sub modules.
This module is meant for use with Terraform 0.12. If you haven't upgraded and need a Terraform 0.11.x-compatible version of this module, the last released version intended for Terraform 0.11.x is 3.0.0.
There are multiple examples included in the examples folder but simple usage is as follows:
# google_client_config and kubernetes provider must be explicitly specified like the following.
data "google_client_config" "default" {}
provider "kubernetes" {
host = "https://${module.gke.endpoint}"
token = data.google_client_config.default.access_token
cluster_ca_certificate = base64decode(module.gke.ca_certificate)
}
module "gke" {
source = "terraform-google-modules/kubernetes-engine/google"
project_id = "<PROJECT ID>"
name = "gke-test-1"
region = "us-central1"
zones = ["us-central1-a", "us-central1-b", "us-central1-f"]
network = "vpc-01"
subnetwork = "us-central1-01"
ip_range_pods = "us-central1-01-gke-01-pods"
ip_range_services = "us-central1-01-gke-01-services"
http_load_balancing = false
horizontal_pod_autoscaling = true
network_policy = false
node_pools = [
{
name = "default-node-pool"
machine_type = "e2-medium"
node_locations = "us-central1-b,us-central1-c"
min_count = 1
max_count = 100
local_ssd_count = 0
disk_size_gb = 100
disk_type = "pd-standard"
image_type = "COS"
auto_repair = true
auto_upgrade = true
service_account = "project-service-account@<PROJECT ID>.iam.gserviceaccount.com"
preemptible = false
initial_node_count = 80
},
]
node_pools_oauth_scopes = {
all = []
default-node-pool = [
"https://www.googleapis.com/auth/cloud-platform",
]
}
node_pools_labels = {
all = {}
default-node-pool = {
default-node-pool = true
}
}
node_pools_metadata = {
all = {}
default-node-pool = {
node-pool-metadata-custom-value = "my-node-pool"
}
}
node_pools_taints = {
all = []
default-node-pool = [
{
key = "default-node-pool"
value = true
effect = "PREFER_NO_SCHEDULE"
},
]
}
node_pools_tags = {
all = []
default-node-pool = [
"default-node-pool",
]
}
}Then perform the following commands on the root folder:
terraform initto get the pluginsterraform planto see the infrastructure planterraform applyto apply the infrastructure buildterraform destroyto destroy the built infrastructure
| Name | Description | Type | Default | Required |
|---|---|---|---|---|
| add_cluster_firewall_rules | Create additional firewall rules | bool |
false |
no |
| add_master_webhook_firewall_rules | Create master_webhook firewall rules for ports defined in firewall_inbound_ports |
bool |
false |
no |
| add_shadow_firewall_rules | Create GKE shadow firewall (the same as default firewall rules with firewall logs enabled). | bool |
false |
no |
| basic_auth_password | The password to be used with Basic Authentication. | string |
"" |
no |
| basic_auth_username | The username to be used with Basic Authentication. An empty value will disable Basic Authentication, which is the recommended configuration. | string |
"" |
no |
| cluster_autoscaling | Cluster autoscaling configuration. See more details | object({ |
{ |
no |
| cluster_ipv4_cidr | The IP address range of the kubernetes pods in this cluster. Default is an automatically assigned CIDR. | any |
null |
no |
| cluster_resource_labels | The GCE resource labels (a map of key/value pairs) to be applied to the cluster | map(string) |
{} |
no |
| configure_ip_masq | Enables the installation of ip masquerading, which is usually no longer required when using aliasied IP addresses. IP masquerading uses a kubectl call, so when you have a private cluster, you will need access to the API server. | bool |
false |
no |
| create_service_account | Defines if service account specified to run nodes should be created. | bool |
true |
no |
| database_encryption | Application-layer Secrets Encryption settings. The object format is {state = string, key_name = string}. Valid values of state are: "ENCRYPTED"; "DECRYPTED". key_name is the name of a CloudKMS key. | list(object({ state = string, key_name = string })) |
[ |
no |
| default_max_pods_per_node | The maximum number of pods to schedule per node | number |
110 |
no |
| description | The description of the cluster | string |
"" |
no |
| disable_legacy_metadata_endpoints | Disable the /0.1/ and /v1beta1/ metadata server endpoints on the node. Changing this value will cause all node pools to be recreated. | bool |
true |
no |
| enable_binary_authorization | Enable BinAuthZ Admission controller | bool |
false |
no |
| enable_network_egress_export | Whether to enable network egress metering for this cluster. If enabled, a daemonset will be created in the cluster to meter network egress traffic. | bool |
false |
no |
| enable_resource_consumption_export | Whether to enable resource consumption metering on this cluster. When enabled, a table will be created in the resource export BigQuery dataset to store resource consumption data. The resulting table can be joined with the resource usage table or with BigQuery billing export. | bool |
true |
no |
| enable_shielded_nodes | Enable Shielded Nodes features on all nodes in this cluster | bool |
true |
no |
| enable_vertical_pod_autoscaling | Vertical Pod Autoscaling automatically adjusts the resources of pods controlled by it | bool |
false |
no |
| firewall_inbound_ports | List of TCP ports for admission/webhook controllers. Either flag add_master_webhook_firewall_rules or add_cluster_firewall_rules (also adds egress rules) must be set to true for inbound-ports firewall rules to be applied. |
list(string) |
[ |
no |
| firewall_priority | Priority rule for firewall rules | number |
1000 |
no |
| gcloud_upgrade | Whether to upgrade gcloud at runtime | bool |
false |
no |
| grant_registry_access | Grants created cluster-specific service account storage.objectViewer role. | bool |
false |
no |
| horizontal_pod_autoscaling | Enable horizontal pod autoscaling addon | bool |
true |
no |
| http_load_balancing | Enable httpload balancer addon | bool |
true |
no |
| identity_namespace | Workload Identity namespace. (Default value of enabled automatically sets project based namespace [project_id].svc.id.goog) |
string |
"enabled" |
no |
| impersonate_service_account | An optional service account to impersonate for gcloud commands. If this service account is not specified, the module will use Application Default Credentials. | string |
"" |
no |
| initial_node_count | The number of nodes to create in this cluster's default node pool. | number |
0 |
no |
| ip_masq_link_local | Whether to masquerade traffic to the link-local prefix (169.254.0.0/16). | bool |
false |
no |
| ip_masq_resync_interval | The interval at which the agent attempts to sync its ConfigMap file from the disk. | string |
"60s" |
no |
| ip_range_pods | The name of the secondary subnet ip range to use for pods | string |
n/a | yes |
| ip_range_services | The name of the secondary subnet range to use for services | string |
n/a | yes |
| issue_client_certificate | Issues a client certificate to authenticate to the cluster endpoint. To maximize the security of your cluster, leave this option disabled. Client certificates don't automatically rotate and aren't easily revocable. WARNING: changing this after cluster creation is destructive! | bool |
false |
no |
| kubernetes_version | The Kubernetes version of the masters. If set to 'latest' it will pull latest available version in the selected region. | string |
"latest" |
no |
| logging_service | The logging service that the cluster should write logs to. Available options include logging.googleapis.com, logging.googleapis.com/kubernetes (beta), and none | string |
"logging.googleapis.com/kubernetes" |
no |
| maintenance_exclusions | List of maintenance exclusions. A cluster can have up to three | list(object({ name = string, start_time = string, end_time = string })) |
[] |
no |
| maintenance_start_time | Time window specified for daily or recurring maintenance operations in RFC3339 format | string |
"05:00" |
no |
| master_authorized_networks | List of master authorized networks. If none are provided, disallow external access (except the cluster node IPs, which GKE automatically whitelists). | list(object({ cidr_block = string, display_name = string })) |
[] |
no |
| monitoring_service | The monitoring service that the cluster should write metrics to. Automatically send metrics from pods in the cluster to the Google Cloud Monitoring API. VM metrics will be collected by Google Compute Engine regardless of this setting Available options include monitoring.googleapis.com, monitoring.googleapis.com/kubernetes (beta) and none | string |
"monitoring.googleapis.com/kubernetes" |
no |
| name | The name of the cluster (required) | string |
n/a | yes |
| network | The VPC network to host the cluster in (required) | string |
n/a | yes |
| network_policy | Enable network policy addon | bool |
false |
no |
| network_policy_provider | The network policy provider. | string |
"CALICO" |
no |
| network_project_id | The project ID of the shared VPC's host (for shared vpc support) | string |
"" |
no |
| node_metadata | Specifies how node metadata is exposed to the workload running on the node | string |
"GKE_METADATA" |
no |
| node_pools | List of maps containing node pools | list(map(string)) |
[ |
no |
| node_pools_labels | Map of maps containing node labels by node-pool name | map(map(string)) |
{ |
no |
| node_pools_metadata | Map of maps containing node metadata by node-pool name | map(map(string)) |
{ |
no |
| node_pools_oauth_scopes | Map of lists containing node oauth scopes by node-pool name | map(list(string)) |
{ |
no |
| node_pools_tags | Map of lists containing node network tags by node-pool name | map(list(string)) |
{ |
no |
| node_pools_taints | Map of lists containing node taints by node-pool name | map(list(object({ key = string, value = string, effect = string }))) |
{ |
no |
| non_masquerade_cidrs | List of strings in CIDR notation that specify the IP address ranges that do not use IP masquerading. | list(string) |
[ |
no |
| project_id | The project ID to host the cluster in (required) | string |
n/a | yes |
| region | The region to host the cluster in (optional if zonal cluster / required if regional) | string |
null |
no |
| regional | Whether is a regional cluster (zonal cluster if set false. WARNING: changing this after cluster creation is destructive!) | bool |
true |
no |
| registry_project_ids | Projects holding Google Container Registries. If empty, we use the cluster project. If a service account is created and the grant_registry_access variable is set to true, the storage.objectViewer role is assigned on these projects. |
list(string) |
[] |
no |
| release_channel | The release channel of this cluster. Accepted values are UNSPECIFIED, RAPID, REGULAR and STABLE. Defaults to UNSPECIFIED. |
string |
null |
no |
| remove_default_node_pool | Remove default node pool while setting up the cluster | bool |
false |
no |
| resource_usage_export_dataset_id | The ID of a BigQuery Dataset for using BigQuery as the destination of resource usage export. | string |
"" |
no |
| service_account | The service account to run nodes as if not overridden in node_pools. The create_service_account variable default value (true) will cause a cluster-specific service account to be created. |
string |
"" |
no |
| shadow_firewall_rules_priority | The firewall priority of GKE shadow firewall rules. The priority should be less than default firewall, which is 1000. | number |
999 |
no |
| skip_provisioners | Flag to skip all local-exec provisioners. It breaks stub_domains and upstream_nameservers variables functionality. |
bool |
false |
no |
| stub_domains | Map of stub domains and their resolvers to forward DNS queries for a certain domain to an external DNS server | map(list(string)) |
{} |
no |
| subnetwork | The subnetwork to host the cluster in (required) | string |
n/a | yes |
| upstream_nameservers | If specified, the values replace the nameservers taken by default from the node’s /etc/resolv.conf | list(string) |
[] |
no |
| zones | The zones to host the cluster in (optional if regional cluster / required if zonal) | list(string) |
[] |
no |
| Name | Description |
|---|---|
| ca_certificate | Cluster ca certificate (base64 encoded) |
| cluster_id | Cluster ID |
| endpoint | Cluster endpoint |
| horizontal_pod_autoscaling_enabled | Whether horizontal pod autoscaling enabled |
| http_load_balancing_enabled | Whether http load balancing enabled |
| identity_namespace | Workload Identity namespace |
| instance_group_urls | List of GKE generated instance groups |
| location | Cluster location (region if regional cluster, zone if zonal cluster) |
| logging_service | Logging service used |
| master_authorized_networks_config | Networks from which access to master is permitted |
| master_version | Current master kubernetes version |
| min_master_version | Minimum master kubernetes version |
| monitoring_service | Monitoring service used |
| name | Cluster name |
| network_policy_enabled | Whether network policy enabled |
| node_pools_names | List of node pools names |
| node_pools_versions | List of node pools versions |
| region | Cluster region |
| release_channel | The release channel of this cluster |
| service_account | The service account to default running nodes as if not overridden in node_pools. |
| type | Cluster type (regional / zonal) |
| zones | List of zones in which the cluster resides |
The node_pools variable takes the following parameters:
| Name | Description | Default | Requirement |
|---|---|---|---|
| accelerator_count | The number of the guest accelerator cards exposed to this instance | 0 | Optional |
| accelerator_type | The accelerator type resource to expose to the instance | " " | Optional |
| auto_repair | Whether the nodes will be automatically repaired | true | Optional |
| autoscaling | Configuration required by cluster autoscaler to adjust the size of the node pool to the current cluster usage | true | Optional |
| auto_upgrade | Whether the nodes will be automatically upgraded | true (if cluster is regional) | Optional |
| disk_size_gb | Size of the disk attached to each node, specified in GB. The smallest allowed disk size is 10GB | 100 | Optional |
| disk_type | Type of the disk attached to each node (e.g. 'pd-standard' or 'pd-ssd') | pd-standard | Optional |
| effect | Effect for the taint | Required | |
| enable_integrity_monitoring | Enables monitoring and attestation of the boot integrity of the instance. The attestation is performed against the integrity policy baseline. This baseline is initially derived from the implicitly trusted boot image when the instance is created. | true | Optional |
| enable_secure_boot | Secure Boot helps ensure that the system only runs authentic software by verifying the digital signature of all boot components, and halting the boot process if signature verification fails. | false | Optional |
| image_type | The image type to use for this node. Note that changing the image type will delete and recreate all nodes in the node pool | COS | Optional |
| initial_node_count | The initial number of nodes for the pool. In regional or multi-zonal clusters, this is the number of nodes per zone. Changing this will force recreation of the resource. Defaults to the value of min_count | " " | Optional |
| key | The key required for the taint | Required | |
| local_ssd_count | The amount of local SSD disks that will be attached to each cluster node and may be used as a hostpath volume or a local PersistentVolume. |
0 | Optional |
| machine_type | The name of a Google Compute Engine machine type | e2-medium | Optional |
| max_count | Maximum number of nodes in the NodePool. Must be >= min_count | 100 | Optional |
| min_count | Minimum number of nodes in the NodePool. Must be >=0 and <= max_count. Should be used when autoscaling is true | 1 | Optional |
| name | The name of the node pool | Required | |
| node_count | The number of nodes in the nodepool when autoscaling is false. Otherwise defaults to 1. Only valid for non-autoscaling clusers | Required | |
| node_locations | The list of zones in which the cluster's nodes are located. Nodes must be in the region of their regional cluster or in the same region as their cluster's zone for zonal clusters. Defaults to cluster level node locations if nothing is specified | " " | Optional |
| node_metadata | Options to expose the node metadata to the workload running on the node | Optional | |
| preemptible | A boolean that represents whether or not the underlying node VMs are preemptible | false | Optional |
| service_account | The service account to be used by the Node VMs | " " | Optional |
| tags | The list of instance tags applied to all nodes | Required | |
| value | The value for the taint | Required | |
| version | The Kubernetes version for the nodes in this pool. Should only be set if auto_upgrade is false | " " | Optional |
Before this module can be used on a project, you must ensure that the following pre-requisites are fulfilled:
- Terraform and kubectl are installed on the machine where Terraform is executed.
- The Service Account you execute the module with has the right permissions.
- The Compute Engine and Kubernetes Engine APIs are active on the project you will launch the cluster in.
- If you are using a Shared VPC, the APIs must also be activated on the Shared VPC host project and your service account needs the proper permissions there.
The project factory can be used to provision projects with the correct APIs active and the necessary Shared VPC connections.
- kubectl 1.9.x
- Terraform 0.12
- Terraform Provider for GCP v3.41
Some submodules use the terraform-google-gcloud module. By default, this module assumes you already have gcloud installed in your $PATH. See the module documentation for more information.
In order to execute this module you must have a Service Account with the following project roles:
- roles/compute.viewer
- roles/compute.securityAdmin (only required if
add_cluster_firewall_rulesis set totrue) - roles/container.clusterAdmin
- roles/container.developer
- roles/iam.serviceAccountAdmin
- roles/iam.serviceAccountUser
- roles/resourcemanager.projectIamAdmin (only required if
service_accountis set tocreate)
Additionally, if service_account is set to create and grant_registry_access is requested, the service account requires the following role on the registry_project_ids projects:
- roles/resourcemanager.projectIamAdmin
In order to operate with the Service Account you must activate the following APIs on the project where the Service Account was created:
- Compute Engine API - compute.googleapis.com
- Kubernetes Engine API - container.googleapis.com