The cluster master is the "control plane" of the cluster; for example, it runs
the Kubernetes API used by kubectl. Worker machines are configured by
attaching GKE node pools
to the cluster module.
How do you use this module?
See the root README for instructions on
using Terraform modules.
See variables.tf for all the
variables you can set on this module.
See outputs.tf for all the variables
that are outputted by this module.
What is a GKE Cluster?
The GKE Cluster, or "cluster master", runs the Kubernetes control plane
processes including the Kubernetes API server, scheduler, and core resource
controllers.
The master is the unified endpoint for your cluster; it's the "hub" through
which all other components such as nodes interact. Users can interact with the
cluster via Kubernetes API calls, such as by using kubectl. The GKE cluster
is responsible for running workloads on nodes, as well as scaling/upgrading
nodes.
How do I attach worker machines using a GKE node pool?
GKE Node Pools
are a group of nodes who share the same configuration, defined as a NodeConfig.
Node pools also control the autoscaling of their nodes, and autoscaling
configuration is done inline, alongside the node config definition. A GKE
Cluster can have multiple node pools defined.
Node pools are configured directly with the
google_container_node_pool
Terraform resource by providing a reference to the cluster you configured with
this module as the cluster field.
What VPC network will this cluster use?
You must explicitly specify the network and subnetwork of your GKE cluster using
the network and subnetwork fields; this module will not implicitly use the
default network with an automatically generated subnetwork.
The modules in the terraform-google-network
Gruntwork module are a useful tool for configuring your VPC network and
subnetworks in GCP.
What is a VPC-native cluster?
A VPC-native cluster is a GKE Cluster that uses alias IP ranges, in that
it allocates IP addresses from a block known to GCP. When using an alias range, pod addresses are natively routable
within GCP, and VPC networks can ensure that the IP range the cluster uses is reserved.
While using a secondary IP range is recommended in order to to separate cluster master and pod IPs,
when using a network in the same project as your GKE cluster you can specify a blank range name to draw alias IPs from your subnetwork's primary IP range. If
using a shared VPC network (a network from another GCP project) using an explicit secondary range is required.
In a private cluster, the nodes have internal IP addresses only, which ensures that their workloads are isolated from the public Internet.
Private nodes do not have outbound Internet access, but Private Google Access provides private nodes and their workloads with
limited outbound access to Google Cloud Platform APIs and services over Google's private network.
If you want your cluster nodes to be able to access the Internet, for example pull images from external container registries,
you will have to set up Cloud NAT.
See Example GKE Setup for further information.
You can create a private cluster by setting enable_private_nodes to true. Note that with a private cluster, setting
the master CIDR range with master_ipv4_cidr_block is also required.
How do I control access to the cluster master?
In a private cluster, the master has two endpoints:
Private endpoint: This is the internal IP address of the master, behind an internal load balancer in the master's
VPC network. Nodes communicate with the master using the private endpoint. Any VM in your VPC network, and in the same
region as your private cluster, can use the private endpoint.
Public endpoint: This is the external IP address of the master. You can disable access to the public endpoint by setting
enable_private_endpoint to true.
You can relax the restrictions by authorizing certain address ranges to access the endpoints with the input variable
master_authorized_networks_config.
How do I configure logging and monitoring with Stackdriver for my cluster?
Stackdriver Kubernetes Engine Monitoring is enabled by default using this module. It provides improved support for both
Stackdriver Monitoring and Stackdriver Logging in your cluster, including a GKE-customized Stackdriver Console with
fine-grained breakdown of resources including namespaces and pods. Learn more with the official documentation
Although Stackdriver Kubernetes Engine Monitoring is enabled by default, you can use the legacy Stackdriver options by
modifying your configuration. See the differences between GKE Stackdriver versions
for the differences between legacy Stackdriver and Stackdriver Kubernetes Engine Monitoring.
How do I use Prometheus for monitoring?
Prometheus monitoring for your cluster is ready to go through GCP's Stackdriver Kubernetes Engine Monitoring service. If
you've configured your GKE cluster with Stackdriver Kubernetes Engine Monitoring, you can follow Google's guide to
using Prometheus to configure your cluster with
Prometheus.
Private cluster restrictions and limitations
Private clusters have the following restrictions and limitations:
The size of the RFC 1918 block for the cluster master must be /28.
The nodes in a private cluster must run Kubernetes version 1.8.14-gke.0 or later.
You cannot convert an existing, non-private cluster to a private cluster.
Each private cluster you create uses a unique VPC Network Peering.
Deleting the VPC peering between the cluster master and the cluster nodes, deleting the firewall rules that allow
ingress traffic from the cluster master to nodes on port 10250, or deleting the default route to the default
Internet gateway, causes a private cluster to stop functioning.
How do I configure the cluster to use Google Groups for GKE?
If you want to enable Google Groups for use with RBAC, you have to provide a G Suite domain name using input variable var.gsuite_domain_name. If a
value is provided, the cluster will be initialised with a security group gke-security-groups@[yourdomain.com].
In G Suite, you will have to:
Create a G Suite Google Group in your domain, named gke-security-groups@[yourdomain.com]. The group must be named exactly gke-security-groups.
Create groups, if they do not already exist, that represent groups of users or groups who should have different permissions on your clusters.
Add these groups (not users) to the membership of gke-security-groups@[yourdomain.com].
After the cluster has been created, you are ready to create Roles, ClusterRoles, RoleBindings, and ClusterRoleBindings
that reference your G Suite Google Groups. Note that you cannot enable this feature on existing clusters.
For more information, see https://cloud.google.com/kubernetes-engine/docs/how-to/role-based-access-control#google-groups-for-gke.
Questions? Ask away.
We're here to talk about our services, answer any questions, give advice, or just to chat.
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a":"33ef675bb7206ab6fb5176d60115e0f261e5c190"},{"name":"validation","children":[{"name":"validate_all_modules_and_examples_test.go","path":"test/validation/validate_all_modules_and_examples_test.go","sha":"74c928d0cbc2914e5cd708277bd857cb2375b660"}]}]},{"name":"variables.tf","path":"variables.tf","sha":"3c24dc1b8c5e8e0528f405a97e6f18e409c161b3"}]},"detailsContent":"<h1 class=\"preview__body--title\" id=\"gke-cluster-module\">GKE Cluster Module</h1><div class=\"preview__body--border\"></div><p>The GKE Cluster module is used to administer the <a href=\"https://cloud.google.com/kubernetes-engine/docs/concepts/cluster-architecture\" class=\"preview__body--description--blue\" target=\"_blank\">cluster master</a>\nfor a <a href=\"https://cloud.google.com/kubernetes-engine/docs/how-to/cluster-admin-overview\" class=\"preview__body--description--blue\" target=\"_blank\">Google Kubernetes Engine (GKE) Cluster</a>.</p>\n<p>The cluster master is the "control plane" of the cluster; for example, it runs\nthe Kubernetes API used by <code>kubectl</code>. Worker machines are configured by\nattaching <a href=\"https://cloud.google.com/kubernetes-engine/docs/concepts/node-pools\" class=\"preview__body--description--blue\" target=\"_blank\">GKE node pools</a>\nto the cluster module.</p>\n<h2 class=\"preview__body--subtitle\" id=\"how-do-you-use-this-module\">How do you use this module?</h2>\n<ul>\n<li>See the <a href=\"/repos/v0.7.0/terraform-google-gke/README.md\" class=\"preview__body--description--blue\">root README</a> for instructions on\nusing Terraform modules.</li>\n<li>See the <a href=\"/repos/v0.7.0/terraform-google-gke/examples\" class=\"preview__body--description--blue\">examples</a> folder for example usage.</li>\n<li>See <a href=\"/repos/v0.7.0/terraform-google-gke/modules/gke-cluster/variables.tf\" class=\"preview__body--description--blue\">variables.tf</a> for all the\nvariables you can set on this module.</li>\n<li>See <a href=\"/repos/v0.7.0/terraform-google-gke/modules/gke-cluster/outputs.tf\" class=\"preview__body--description--blue\">outputs.tf</a> for all the variables\nthat are outputted by this module.</li>\n</ul>\n<h2 class=\"preview__body--subtitle\" id=\"what-is-a-gke-cluster\">What is a GKE Cluster?</h2>\n<p>The GKE Cluster, or "cluster master", runs the Kubernetes control plane\nprocesses including the Kubernetes API server, scheduler, and core resource\ncontrollers.</p>\n<p>The master is the unified endpoint for your cluster; it's the "hub" through\nwhich all other components such as nodes interact. Users can interact with the\ncluster via Kubernetes API calls, such as by using <code>kubectl</code>. The GKE cluster\nis responsible for running workloads on nodes, as well as scaling/upgrading\nnodes.</p>\n<h2 class=\"preview__body--subtitle\" id=\"how-do-i-attach-worker-machines-using-a-gke-node-pool\">How do I attach worker machines using a GKE node pool?</h2>\n<p>A "<a href=\"https://kubernetes.io/docs/concepts/architecture/nodes/\" class=\"preview__body--description--blue\" target=\"_blank\">node</a>" is\na worker machine in Kubernetes; in GKE, nodes are provisioned as\n<a href=\"https://cloud.google.com/compute/docs/instances/\" class=\"preview__body--description--blue\" target=\"_blank\">Google Compute Engine VM instances</a>.</p>\n<p><a href=\"https://cloud.google.com/kubernetes-engine/docs/concepts/node-pools\" class=\"preview__body--description--blue\" target=\"_blank\">GKE Node Pools</a>\nare a group of nodes who share the same configuration, defined as a <a href=\"https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/NodeConfig\" class=\"preview__body--description--blue\" target=\"_blank\">NodeConfig</a>.\nNode pools also control the autoscaling of their nodes, and autoscaling\nconfiguration is done inline, alongside the node config definition. A GKE\nCluster can have multiple node pools defined.</p>\n<p>Node pools are configured directly with the\n<a href=\"https://www.terraform.io/docs/providers/google/r/container_node_pool.html\" class=\"preview__body--description--blue\" target=\"_blank\"><code>google_container_node_pool</code></a>\nTerraform resource by providing a reference to the cluster you configured with\nthis module as the <code>cluster</code> field.</p>\n<h2 class=\"preview__body--subtitle\" id=\"what-vpc-network-will-this-cluster-use\">What VPC network will this cluster use?</h2>\n<p>You must explicitly specify the network and subnetwork of your GKE cluster using\nthe <code>network</code> and <code>subnetwork</code> fields; this module will not implicitly use the\n<code>default</code> network with an automatically generated subnetwork.</p>\n<p>The modules in the <a href=\"/repos/terraform-google-network\" class=\"preview__body--description--blue\"><code>terraform-google-network</code></a>\nGruntwork module are a useful tool for configuring your VPC network and\nsubnetworks in GCP.</p>\n<h2 class=\"preview__body--subtitle\" id=\"what-is-a-vpc-native-cluster\">What is a VPC-native cluster?</h2>\n<p>A VPC-native cluster is a GKE Cluster that uses <a href=\"https://cloud.google.com/vpc/docs/alias-ip\" class=\"preview__body--description--blue\" target=\"_blank\">alias IP ranges</a>, in that\nit allocates IP addresses from a block known to GCP. When using an alias range, pod addresses are natively routable\nwithin GCP, and VPC networks can ensure that the IP range the cluster uses is reserved.</p>\n<p>While using a secondary IP range is recommended <a href=\"/repos/terraform-google-network/modules/vpc-network#how-is-a-secondary-range-connected-to-an-alias-ip-range\" class=\"preview__body--description--blue\">in order to to separate cluster master and pod IPs</a>,\nwhen using a network in the same project as your GKE cluster you can specify a blank range name to draw alias IPs from your subnetwork's primary IP range. If\nusing a shared VPC network (a network from another GCP project) using an explicit secondary range is required.</p>\n<p>See <a href=\"https://cloud.google.com/kubernetes-engine/docs/how-to/alias-ips#cluster_sizing\" class=\"preview__body--description--blue\" target=\"_blank\">considerations for cluster sizing</a>\nfor more information on sizing secondary ranges for your VPC-native cluster.</p>\n<h2 class=\"preview__body--subtitle\" id=\"what-is-a-private-cluster\">What is a private cluster?</h2>\n<p>In a private cluster, the nodes have internal IP addresses only, which ensures that their workloads are isolated from the public Internet.\nPrivate nodes do not have outbound Internet access, but Private Google Access provides private nodes and their workloads with\nlimited outbound access to Google Cloud Platform APIs and services over Google's private network.</p>\n<p>If you want your cluster nodes to be able to access the Internet, for example pull images from external container registries,\nyou will have to set up <a href=\"https://cloud.google.com/nat/docs/overview\" class=\"preview__body--description--blue\" target=\"_blank\">Cloud NAT</a>.\nSee <a href=\"https://cloud.google.com/nat/docs/gke-example\" class=\"preview__body--description--blue\" target=\"_blank\">Example GKE Setup</a> for further information.</p>\n<p>You can create a private cluster by setting <code>enable_private_nodes</code> to <code>true</code>. Note that with a private cluster, setting\nthe master CIDR range with <code>master_ipv4_cidr_block</code> is also required.</p>\n<h3 class=\"preview__body--subtitle\" id=\"how-do-i-control-access-to-the-cluster-master\">How do I control access to the cluster master?</h3>\n<p>In a private cluster, the master has two endpoints:</p>\n<ul>\n<li>\n<p><strong>Private endpoint:</strong> This is the internal IP address of the master, behind an internal load balancer in the master's\nVPC network. Nodes communicate with the master using the private endpoint. Any VM in your VPC network, and in the same\nregion as your private cluster, can use the private endpoint.</p>\n</li>\n<li>\n<p><strong>Public endpoint:</strong> This is the external IP address of the master. You can disable access to the public endpoint by setting\n<code>enable_private_endpoint</code> to <code>true</code>.</p>\n</li>\n</ul>\n<p>You can relax the restrictions by authorizing certain address ranges to access the endpoints with the input variable\n<code>master_authorized_networks_config</code>.</p>\n<h3 class=\"preview__body--subtitle\" id=\"how-do-i-configure-logging-and-monitoring-with-stackdriver-for-my-cluster\">How do I configure logging and monitoring with Stackdriver for my cluster?</h3>\n<p>Stackdriver Kubernetes Engine Monitoring is enabled by default using this module. It provides improved support for both\nStackdriver Monitoring and Stackdriver Logging in your cluster, including a GKE-customized Stackdriver Console with\nfine-grained breakdown of resources including namespaces and pods. Learn more with the <a href=\"https://cloud.google.com/monitoring/kubernetes-engine/#about-skm\" class=\"preview__body--description--blue\" target=\"_blank\">official documentation</a></p>\n<p>Although Stackdriver Kubernetes Engine Monitoring is enabled by default, you can use the legacy Stackdriver options by\nmodifying your configuration. See the <a href=\"https://cloud.google.com/monitoring/kubernetes-engine/#version\" class=\"preview__body--description--blue\" target=\"_blank\">differences between GKE Stackdriver versions</a>\nfor the differences between legacy Stackdriver and Stackdriver Kubernetes Engine Monitoring.</p>\n<h4 id=\"how-do-i-use-prometheus-for-monitoring\">How do I use Prometheus for monitoring?</h4>\n<p>Prometheus monitoring for your cluster is ready to go through GCP's Stackdriver Kubernetes Engine Monitoring service. If\nyou've configured your GKE cluster with Stackdriver Kubernetes Engine Monitoring, you can follow Google's guide to\n<a href=\"https://cloud.google.com/monitoring/kubernetes-engine/prometheus\" class=\"preview__body--description--blue\" target=\"_blank\">using Prometheus</a> to configure your cluster with\nPrometheus.</p>\n<h3 class=\"preview__body--subtitle\" id=\"private-cluster-restrictions-and-limitations\">Private cluster restrictions and limitations</h3>\n<p>Private clusters have the following restrictions and limitations:</p>\n<ul>\n<li>The size of the RFC 1918 block for the cluster master must be /28.</li>\n<li>The nodes in a private cluster must run Kubernetes version 1.8.14-gke.0 or later.</li>\n<li>You cannot convert an existing, non-private cluster to a private cluster.</li>\n<li>Each private cluster you create uses a unique VPC Network Peering.</li>\n<li>Deleting the VPC peering between the cluster master and the cluster nodes, deleting the firewall rules that allow\ningress traffic from the cluster master to nodes on port 10250, or deleting the default route to the default\nInternet gateway, causes a private cluster to stop functioning.</li>\n</ul>\n<h2 class=\"preview__body--subtitle\" id=\"how-do-i-configure-the-cluster-to-use-google-groups-for-gke\">How do I configure the cluster to use Google Groups for GKE?</h2>\n<p>If you want to enable Google Groups for use with RBAC, you have to provide a G Suite domain name using input variable <code>var.gsuite_domain_name</code>. If a\nvalue is provided, the cluster will be initialised with a security group <code>gke-security-groups@[yourdomain.com]</code>.</p>\n<p>In G Suite, you will have to:</p>\n<ol>\n<li>Create a G Suite Google Group in your domain, named gke-security-groups@[yourdomain.com]. The group must be named exactly gke-security-groups.</li>\n<li>Create groups, if they do not already exist, that represent groups of users or groups who should have different permissions on your clusters.</li>\n<li>Add these groups (not users) to the membership of gke-security-groups@[yourdomain.com].</li>\n</ol>\n<p>After the cluster has been created, you are ready to create Roles, ClusterRoles, RoleBindings, and ClusterRoleBindings\nthat reference your G Suite Google Groups. Note that you cannot enable this feature on existing clusters.</p>\n<p>For more information, see https://cloud.google.com/kubernetes-engine/docs/how-to/role-based-access-control#google-groups-for-gke.</p>\n","repoName":"terraform-google-gke","repoRef":"v0.10.0","serviceDescriptor":{"serviceName":"StackDriver","serviceRepoName":"terraform-google-gke","serviceRepoOrg":"gruntwork-io","serviceMainReadmePath":"/modules/gke-cluster/README.md#how-do-i-configure-logging-and-monitoring-with-stackdriver-for-my-cluster","cloudProviders":["gcp"],"description":"Aggregate all metrics from your GCP services.","imageUrl":"grunt.png","licenseType":"open-source","technologies":["Terraform"],"compliance":[],"tags":[""]},"serviceCategoryName":"Monitoring & alerting","fileName":"README.md","filePath":"/modules/gke-cluster","title":"Repo Browser: StackDriver","description":"Browse the repos in the Gruntwork Infrastructure as Code Library."}