72 lines
2.8 KiB
Markdown
72 lines
2.8 KiB
Markdown
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# Worker Pools
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Typhoon can create "worker pools", groups of homogeneous workers that are part of an existing cluster. For example, you may wish to augment a Kubernetes cluster with groups of workers with a different machine type, larger disks, or preemptibility.
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## Google Cloud
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Create a cluster following the Google Cloud [tutorial](../google-cloud.md#cluster). Then define a worker pool using the internal `workers` Terraform module.
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```tf
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module "yavin-worker-pool" {
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source = "git::https://github.com/poseidon/typhoon//google-cloud/container-linux/kubernetes/workers?ref=v1.9.4"
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# Google Cloud
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network = "${module.google-cloud-yavin.network_name}"
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region = "us-central1"
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count = 2
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machine_type = "n1-standard-16"
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preemptible = true
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cluster_name = "yavin-16x"
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ssh_authorized_key = "${var.ssh_authorized_key}"
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kubeconfig = "${module.google-cloud-yavin.kubeconfig}"
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}
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```
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Apply the change.
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```
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terraform apply
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```
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Verify a managed instance group of workers joins the cluster within a few minutes.
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```
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$ kubectl get nodes
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NAME STATUS AGE VERSION
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yavin-controller-0.c.example-com.internal Ready 6m v1.9.3
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yavin-worker-jrbf.c.example-com.internal Ready 5m v1.9.3
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yavin-worker-mzdm.c.example-com.internal Ready 5m v1.9.3
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yavin-16x-worker-jrbf.c.example-com.internal Ready 3m v1.9.3
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yavin-16x-worker-mzdm.c.example-com.internal Ready 3m v1.9.3
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```
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### Variables
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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).
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#### Required
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| Name | Description | Example |
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|:-----|:------------|:--------|
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| cluster_name | Unique name | "yavin-worker-pool" |
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| region | Must match region of cluster | "us-central1" |
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| network | Must match network name output by cluster | "${module.cluster.network_name}" |
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| ssh_authorized_key | SSH public key for ~/.ssh_authorized_keys | "ssh-rsa AAAAB3NZ..." |
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#### Optional
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| Name | Description | Default | Example |
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|:-----|:------------|:--------|:--------|
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| count | Number of workers | 1 | 3 |
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| machine_type | Machine type for compute instances | "n1-standard-1" | See below |
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| os_image | OS image for compute instances | "coreos-stable" | "coreos-alpha" |
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| disk_size | Size of the disk in GB | 40 | 100 |
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| preemptible | If enabled, Compute Engine will terminate instances randomly within 24 hours | false | true |
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| service_cidr | Must match service_cidr of cluster | "10.3.0.0/16" | "10.3.0.0/24" |
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| cluster_domain_suffix | Must match domain suffix of cluster | "cluster.local" | "k8s.example.com" |
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Check the list of valid [machine types](https://cloud.google.com/compute/docs/machine-types).
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