# Worker Pools Typhoon AWS and Google Cloud allow additional groups of workers to be defined and joined to a cluster. For example, add worker pools of instances with different types, disk sizes, Container Linux channels, or preemptibility modes. Internal Terraform Modules: * `aws/container-linux/kubernetes/workers` * `google-cloud/container-linux/kubernetes/workers` ## AWS Create a cluster following the AWS [tutorial](../aws.md#cluster). Define a worker pool using the AWS internal `workers` module. ```tf module "tempest-worker-pool" { source = "git::https://github.com/poseidon/typhoon//aws/container-linux/kubernetes/workers?ref=v1.9.6" providers = { aws = "aws.default" } # AWS vpc_id = "${module.aws-tempest.vpc_id}" subnet_ids = "${module.aws-tempest.subnet_ids}" security_groups = "${module.aws-tempest.worker_security_groups}" # configuration name = "tempest-worker-pool" kubeconfig = "${module.aws-tempest.kubeconfig}" ssh_authorized_key = "${var.ssh_authorized_key}" count = 2 instance_type = "m5.large" os_channel = "beta" } ``` Apply the change. ``` terraform apply ``` Verify an auto-scaling group of workers join the cluster within a few minutes. ### Variables The AWS internal `workers` module supports a number of [variables](https://github.com/poseidon/typhoon/blob/master/aws/container-linux/kubernetes/workers/variables.tf). #### Required | Name | Description | Example | |:-----|:------------|:--------| | vpc_id | Must be set to `vpc_id` output by cluster | "${module.cluster.vpc_id}" | | subnet_ids | Must be set to `subnet_ids` output by cluster | "${module.cluster.subnet_ids}" | | security_groups | Must be set to `worker_security_groups` output by cluster | "${module.cluster.worker_security_groups}" | | name | Unique name (distinct from cluster name) | "tempest-m5s" | | kubeconfig | Must be set to `kubeconfig` output by cluster | "${module.cluster.kubeconfig}" | | ssh_authorized_key | SSH public key for user 'core' | "ssh-rsa AAAAB3NZ..." | #### Optional | Name | Description | Default | Example | |:-----|:------------|:--------|:--------| | count | Number of instances | 1 | 3 | | instance_type | EC2 instance type | "t2.small" | "t2.medium" | | os_channel | Container Linux AMI channel | stable| "beta", "alpha" | | disk_size | Size of the disk in GB | 40 | 100 | | service_cidr | Must match `service_cidr` of cluster | "10.3.0.0/16" | "10.3.0.0/24" | | cluster_domain_suffix | Must match `cluster_domain_suffix` of cluster | "cluster.local" | "k8s.example.com" | Check the list of valid [instance types](https://aws.amazon.com/ec2/instance-types/). ## Google Cloud Create a cluster following the Google Cloud [tutorial](../google-cloud.md#cluster). Define a worker pool using the Google Cloud internal `workers` module. ```tf module "yavin-worker-pool" { source = "git::https://github.com/poseidon/typhoon//google-cloud/container-linux/kubernetes/workers?ref=v1.9.6" providers = { google = "google.default" } # Google Cloud region = "us-central1" network = "${module.google-cloud-yavin.network_name}" cluster_name = "yavin" # configuration name = "yavin-16x" kubeconfig = "${module.google-cloud-yavin.kubeconfig}" ssh_authorized_key = "${var.ssh_authorized_key}" count = 2 machine_type = "n1-standard-16" os_image = "coreos-beta" preemptible = true } ``` Apply the change. ``` terraform apply ``` Verify a managed instance group of workers joins the cluster within a few minutes. ``` $ kubectl get nodes NAME STATUS AGE VERSION yavin-controller-0.c.example-com.internal Ready 6m v1.9.6 yavin-worker-jrbf.c.example-com.internal Ready 5m v1.9.6 yavin-worker-mzdm.c.example-com.internal Ready 5m v1.9.6 yavin-16x-worker-jrbf.c.example-com.internal Ready 3m v1.9.6 yavin-16x-worker-mzdm.c.example-com.internal Ready 3m v1.9.6 ``` ### Variables The Google Cloud internal `workers` module supports a number of [variables](https://github.com/poseidon/typhoon/blob/master/google-cloud/container-linux/kubernetes/workers/variables.tf). #### Required | Name | Description | Example | |:-----|:------------|:--------| | region | Must be set to `region` of cluster | "us-central1" | | network | Must be set to `network_name` output by cluster | "${module.cluster.network_name}" | | name | Unique name (distinct from cluster name) | "yavin-16x" | | cluster_name | Must be set to `cluster_name` of cluster | "yavin" | | kubeconfig | Must be set to `kubeconfig` output by cluster | "${module.cluster.kubeconfig}" | | ssh_authorized_key | SSH public key for user 'core' | "ssh-rsa AAAAB3NZ..." | #### Optional | Name | Description | Default | Example | |:-----|:------------|:--------|:--------| | count | Number of instances | 1 | 3 | | machine_type | Compute instance machine type | "n1-standard-1" | See below | | os_image | Container Linux image for compute instances | "coreos-stable" | "coreos-alpha", "coreos-beta" | | disk_size | Size of the disk in GB | 40 | 100 | | preemptible | If true, Compute Engine will terminate instances randomly within 24 hours | false | true | | service_cidr | Must match `service_cidr` of cluster | "10.3.0.0/16" | "10.3.0.0/24" | | cluster_domain_suffix | Must match `cluster_domain_suffix` of cluster | "cluster.local" | "k8s.example.com" | Check the list of valid [machine types](https://cloud.google.com/compute/docs/machine-types).