# Worker Pools Typhoon AWS, Azure, 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` * `azure/container-linux/kubernetes/workers` * `google-cloud/container-linux/kubernetes/workers` ## AWS Create a cluster following the AWS [tutorial](../cl/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=v1.14.3" # 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-pool" kubeconfig = module.aws-tempest.kubeconfig ssh_authorized_key = var.ssh_authorized_key # optional worker_count = 2 instance_type = "m5.large" os_image = "coreos-beta" } ``` Apply the change. ``` terraform apply ``` Verify an auto-scaling group of workers joins 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 | |:-----|:------------|:--------| | name | Unique name (distinct from cluster name) | "tempest-m5s" | | 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 | | 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 | |:-----|:------------|:--------|:--------| | worker_count | Number of instances | 1 | 3 | | instance_type | EC2 instance type | "t3.small" | "t3.medium" | | os_image | AMI channel for a Container Linux derivative | coreos-stable | coreos-stable, coreos-beta, coreos-alpha, flatcar-stable, flatcar-beta, flatcar-alpha | | disk_size | Size of the disk in GB | 40 | 100 | | spot_price | Spot price in USD for workers. Leave as default empty string for regular on-demand instances | "" | "0.10" | | 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/) or per-region and per-type [spot prices](https://aws.amazon.com/ec2/spot/pricing/). ## Azure Create a cluster following the Azure [tutorial](../cl/azure.md#cluster). Define a worker pool using the Azure internal `workers` module. ```tf module "ramius-worker-pool" { source = "git::https://github.com/poseidon/typhoon//azure/container-linux/kubernetes/workers?ref=v1.16.0" # Azure region = module.azure-ramius.region resource_group_name = module.azure-ramius.resource_group_name subnet_id = module.azure-ramius.subnet_id security_group_id = module.azure-ramius.security_group_id backend_address_pool_id = module.azure-ramius.backend_address_pool_id # configuration name = "ramius-low-priority" kubeconfig = module.azure-ramius.kubeconfig ssh_authorized_key = var.ssh_authorized_key # optional worker_count = 2 vm_type = "Standard_F4" priority = "Low" } ``` Apply the change. ``` terraform apply ``` Verify a scale set of workers joins the cluster within a few minutes. ### Variables The Azure internal `workers` module supports a number of [variables](https://github.com/poseidon/typhoon/blob/master/azure/container-linux/kubernetes/workers/variables.tf). #### Required | Name | Description | Example | |:-----|:------------|:--------| | name | Unique name (distinct from cluster name) | "ramius-f4" | | region | Must be set to `region` output by cluster | module.cluster.region | | resource_group_name | Must be set to `resource_group_name` output by cluster | module.cluster.resource_group_name | | subnet_id | Must be set to `subnet_id` output by cluster | module.cluster.subnet_id | | security_group_id | Must be set to `security_group_id` output by cluster | module.cluster.security_group_id | | backend_address_pool_id | Must be set to `backend_address_pool_id` output by cluster | module.cluster.backend_address_pool_id | | 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 | |:-----|:------------|:--------|:--------| | worker_count | Number of instances | 1 | 3 | | vm_type | Machine type for instances | "Standard_F1" | See below | | os_image | Channel for a Container Linux derivative | coreos-stable | coreos-stable, coreos-beta, coreos-alpha | | priority | Set priority to Low to use reduced cost surplus capacity, with the tradeoff that instances can be deallocated at any time | Regular | Low | | clc_snippets | Container Linux Config snippets | [] | [example](/advanced/customization/#usage) | | service_cidr | CIDR IPv4 range to assign to Kubernetes services | "10.3.0.0/16" | "10.3.0.0/24" | | cluster_domain_suffix | FQDN suffix for Kubernetes services answered by coredns. | "cluster.local" | "k8s.example.com" | Check the list of valid [machine types](https://azure.microsoft.com/en-us/pricing/details/virtual-machines/linux/) and their [specs](https://docs.microsoft.com/en-us/azure/virtual-machines/linux/sizes-general). Use `az vm list-skus` to get the identifier. ## Google Cloud Create a cluster following the Google Cloud [tutorial](../cl/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=v1.16.0" # Google Cloud region = "europe-west2" 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 # optional worker_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 v1.16.0 yavin-worker-jrbf.c.example-com.internal Ready 5m v1.16.0 yavin-worker-mzdm.c.example-com.internal Ready 5m v1.16.0 yavin-16x-worker-jrbf.c.example-com.internal Ready 3m v1.16.0 yavin-16x-worker-mzdm.c.example-com.internal Ready 3m v1.16.0 ``` ### 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 | |:-----|:------------|:--------| | name | Unique name (distinct from cluster name) | "yavin-16x" | | region | Region for the worker pool instances. May differ from the cluster's region | "europe-west2" | | network | Must be set to `network_name` output by cluster | module.cluster.network_name | | 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..." | Check the list of regions [docs](https://cloud.google.com/compute/docs/regions-zones/regions-zones) or with `gcloud compute regions list`. #### Optional | Name | Description | Default | Example | |:-----|:------------|:--------|:--------| | worker_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).