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typhoon/docs/advanced/worker-pools.md

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# 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 EBS volume in GB | 40 | 100 |
| disk_type | Type of the EBS volume | "gp2" | standard, gp2, io1 |
| disk_iops | IOPS of the EBS volume | 0 (i.e. auto) | 400 |
| spot_price | Spot price in USD for worker instances or 0 to use on-demand instances | 0 | 0.10 |
| clc_snippets | Container Linux Config snippets | [] | [example](/advanced/customization/#usage) |
| service_cidr | Must match `service_cidr` of cluster | "10.3.0.0/16" | "10.3.0.0/24" |
| node_labels | List of initial node labels | [] | ["worker-pool=foo"] |
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=v1.16.2"
# 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_DS1_v2" | 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" |
| node_labels | List of initial node labels | [] | ["worker-pool=foo"] |
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=v1.16.2"
# 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 v1.16.2
yavin-worker-jrbf.c.example-com.internal Ready 5m v1.16.2
yavin-worker-mzdm.c.example-com.internal Ready 5m v1.16.2
yavin-16x-worker-jrbf.c.example-com.internal Ready 3m v1.16.2
yavin-16x-worker-mzdm.c.example-com.internal Ready 3m v1.16.2
```
### 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" |
| cluster_name | Must be set to `cluster_name` of cluster | "yavin" |
| 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 |
| 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 |
| clc_snippets | Container Linux Config snippets | [] | [example](/advanced/customization/#usage) |
| service_cidr | Must match `service_cidr` of cluster | "10.3.0.0/16" | "10.3.0.0/24" |
| node_labels | List of initial node labels | [] | ["worker-pool=foo"] |
Check the list of valid [machine types](https://cloud.google.com/compute/docs/machine-types).
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