terraform-hcloud-kube-hetzner/agents.tf

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module "agents" {
source = "./modules/host"
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for_each = local.agent_nodepools
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name = "${var.use_cluster_name_in_node_name ? "${var.cluster_name}-" : ""}${each.value.nodepool_name}"
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ssh_keys = [hcloud_ssh_key.k3s.id]
public_key = var.public_key
private_key = var.private_key
additional_public_keys = var.additional_public_keys
firewall_ids = [hcloud_firewall.k3s.id]
placement_group_id = hcloud_placement_group.k3s.id
location = each.value.location
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server_type = each.value.server_type
ipv4_subnet_id = hcloud_network_subnet.subnet[[for i, v in var.agent_nodepools : i if v.name == each.value.nodepool_name][0] + 2].id
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# We leave some room so 100 eventual Hetzner LBs that can be created perfectly safely
# It leaves the subnet with 254 x 254 - 100 = 64416 IPs to use, so probably enough.
private_ipv4 = cidrhost(local.network_ipv4_subnets[[for i, v in var.agent_nodepools : i if v.name == each.value.nodepool_name][0] + 2], each.value.index + 101)
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labels = {
"provisioner" = "terraform",
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"engine" = "k3s"
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}
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depends_on = [
hcloud_network_subnet.subnet
]
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}
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resource "null_resource" "agents" {
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for_each = local.agent_nodepools
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triggers = {
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agent_id = module.agents[each.key].id
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}
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connection {
user = "root"
private_key = local.ssh_private_key
agent_identity = local.ssh_identity
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host = module.agents[each.key].ipv4_address
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}
# Generating k3s agent config file
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provisioner "file" {
content = yamlencode({
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node-name = module.agents[each.key].name
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server = "https://${module.control_planes[0].private_ipv4_address}:6443"
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token = random_password.k3s_token.result
kubelet-arg = "cloud-provider=external"
flannel-iface = "eth1"
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node-ip = module.agents[each.key].private_ipv4_address
node-label = each.value.labels
node-taint = each.value.taints
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})
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destination = "/tmp/config.yaml"
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}
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# Install k3s agent
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provisioner "remote-exec" {
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inline = local.install_k3s_agent
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}
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# Start the k3s agent and wait for it to have started
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provisioner "remote-exec" {
inline = [
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"systemctl start k3s-agent 2> /dev/null",
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<<-EOT
timeout 120 bash <<EOF
until systemctl status k3s-agent > /dev/null; do
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systemctl start k3s-agent 2> /dev/null
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echo "Waiting for the k3s agent to start..."
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sleep 2
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done
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EOF
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EOT
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]
}
depends_on = [
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null_resource.first_control_plane,
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hcloud_network_subnet.subnet
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]
}