typhoon/aws/container-linux/kubernetes/workers/workers.tf

91 lines
2.5 KiB
HCL

# Workers AutoScaling Group
resource "aws_autoscaling_group" "workers" {
name = "${var.name}-worker ${aws_launch_configuration.worker.name}"
# count
desired_capacity = var.worker_count
min_size = var.worker_count
max_size = var.worker_count + 2
default_cooldown = 30
health_check_grace_period = 30
# network
vpc_zone_identifier = var.subnet_ids
# template
launch_configuration = aws_launch_configuration.worker.name
# target groups to which instances should be added
target_group_arns = flatten([
aws_lb_target_group.workers-http.id,
aws_lb_target_group.workers-https.id,
var.target_groups,
])
lifecycle {
# override the default destroy and replace update behavior
create_before_destroy = true
}
# Waiting for instance creation delays adding the ASG to state. If instances
# can't be created (e.g. spot price too low), the ASG will be orphaned.
# Orphaned ASGs escape cleanup, can't be updated, and keep bidding if spot is
# used. Disable wait to avoid issues and align with other clouds.
wait_for_capacity_timeout = "0"
tags = [
{
key = "Name"
value = "${var.name}-worker"
propagate_at_launch = true
},
]
}
# Worker template
resource "aws_launch_configuration" "worker" {
image_id = local.ami_id
instance_type = var.instance_type
spot_price = var.spot_price
enable_monitoring = false
user_data = data.ct_config.worker-ignition.rendered
# storage
root_block_device {
volume_type = var.disk_type
volume_size = var.disk_size
iops = var.disk_iops
}
# network
security_groups = var.security_groups
lifecycle {
// Override the default destroy and replace update behavior
create_before_destroy = true
ignore_changes = [image_id]
}
}
# Worker Ignition config
data "ct_config" "worker-ignition" {
content = data.template_file.worker-config.rendered
pretty_print = false
snippets = var.clc_snippets
}
# Worker Container Linux config
data "template_file" "worker-config" {
template = file("${path.module}/cl/worker.yaml.tmpl")
vars = {
kubeconfig = indent(10, var.kubeconfig)
ssh_authorized_key = var.ssh_authorized_key
cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
cluster_domain_suffix = var.cluster_domain_suffix
cgroup_driver = local.flavor == "flatcar" && local.channel == "edge" ? "systemd" : "cgroupfs"
}
}