150 lines
5.5 KiB
Markdown
150 lines
5.5 KiB
Markdown
# 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=v1.9.4"
|
|
|
|
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 | "${module.cluster.kubeconfig}" |
|
|
| ssh_authorized_key | SSH public key for ~/.ssh_authorized_keys | "ssh-rsa AAAAB3NZ..." |
|
|
|
|
#### Optional
|
|
|
|
| Name | Description | Default | Example |
|
|
|:-----|:------------|:--------|:--------|
|
|
| count | Number of instances | 1 | 3 |
|
|
| instance_type | EC2 instance type | "t2.small" | "t2.medium" |
|
|
| os_channel | Container Linux AMI channel | stable| "beta", "alpha" |
|
|
| disk_size | Size of the disk in GB | 40 | 100 |
|
|
| service_cidr | Must match `service_cidr` of cluster | "10.3.0.0/16" | "10.3.0.0/24" |
|
|
| cluster_domain_suffix | Must match `cluster_domain_suffix` of cluster | "cluster.local" | "k8s.example.com" |
|
|
|
|
Check the list of valid [instance types](https://aws.amazon.com/ec2/instance-types/).
|
|
|
|
## Google Cloud
|
|
|
|
Create a cluster following the Google Cloud [tutorial](../google-cloud.md#cluster). Define a worker pool using the Google Cloud internal `workers` module.
|
|
|
|
```tf
|
|
module "yavin-worker-pool" {
|
|
source = "git::https://github.com/poseidon/typhoon//google-cloud/container-linux/kubernetes/workers?ref=v1.9.4"
|
|
|
|
providers = {
|
|
google = "google.default"
|
|
}
|
|
|
|
# Google Cloud
|
|
region = "us-central1"
|
|
network = "${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 v1.9.4
|
|
yavin-worker-jrbf.c.example-com.internal Ready 5m v1.9.4
|
|
yavin-worker-mzdm.c.example-com.internal Ready 5m v1.9.4
|
|
yavin-16x-worker-jrbf.c.example-com.internal Ready 3m v1.9.4
|
|
yavin-16x-worker-mzdm.c.example-com.internal Ready 3m v1.9.4
|
|
```
|
|
|
|
### 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 ~/.ssh_authorized_keys | "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 | OS 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).
|
|
|