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aws: Switch EC2 instances to use resource-based hostnames

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* Use EC2 resource-based hostnames instead of IP-based hostnames. The Amazon
DNS server can resolve A and AAAA queries to IPv4 and IPv6 node addresses
* For example, nodes used to be named like `ip-10-11-12-13.us-east-1.compute.internal`
but going forward use the instance id `i-0123456789abcdef.us-east-1.compute.internal`
* Tag controller node EBS volumes with a name based on the controller node name
This commit is contained in:
Dalton Hubble
2024-08-22 20:02:53 -07:00
parent effa13c141
commit 808b8a948f
7 changed files with 90 additions and 50 deletions
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24
aws/flatcar-linux/kubernetes/workers/workers.tf
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@ -3,16 +3,14 @@ resource "aws_autoscaling_group" "workers" {
name = "${var.name}-worker"
# 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
desired_capacity = var.worker_count
min_size = var.worker_count
max_size = var.worker_count + 2
# network
vpc_zone_identifier = var.subnet_ids
# template
# instance template
launch_template {
id = aws_launch_template.worker.id
version = aws_launch_template.worker.latest_version
@ -32,6 +30,10 @@ resource "aws_autoscaling_group" "workers" {
min_healthy_percentage = 90
}
}
# Grace period before checking new instance's health
health_check_grace_period = 30
# Cooldown period between scaling activities
default_cooldown = 30
lifecycle {
# override the default destroy and replace update behavior
@ -60,8 +62,6 @@ resource "aws_launch_template" "worker" {
enabled = false
}
user_data = sensitive(base64encode(data.ct_config.worker.rendered))
# storage
ebs_optimized = true
block_device_mappings {
@ -76,7 +76,13 @@ resource "aws_launch_template" "worker" {
}
# network
vpc_security_group_ids = var.security_groups
network_interfaces {
associate_public_ip_address = true
security_groups = var.security_groups
}
# boot
user_data = sensitive(base64encode(data.ct_config.worker.rendered))
# metadata
metadata_options {