terraform-hcloud-kube-hetzner/agents.tf

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module "agents" {
source = "./modules/host"
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count = var.agents_num
name = "k3s-agent-${count.index}"
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ssh_keys = [hcloud_ssh_key.k3s.id]
public_key = var.public_key
private_key = var.private_key
additional_public_keys = var.additional_public_keys
firewall_ids = [hcloud_firewall.k3s.id]
placement_group_id = hcloud_placement_group.k3s.id
location = var.location
network_id = hcloud_network.k3s.id
ip = cidrhost(hcloud_network_subnet.k3s.ip_range, 513 + count.index)
server_type = var.control_plane_server_type
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labels = {
"provisioner" = "terraform",
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"engine" = "k3s"
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}
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hcloud_token = var.hcloud_token
}
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resource "null_resource" "agents" {
count = var.agents_num
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triggers = {
agent_id = module.agents[count.index].id
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}
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connection {
user = "root"
private_key = local.ssh_private_key
agent_identity = local.ssh_identity
host = module.agents[count.index].ipv4_address
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}
# Generating k3s agent config file
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provisioner "file" {
content = yamlencode({
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node-name = module.agents[count.index].name
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server = "https://${local.first_control_plane_network_ip}:6443"
token = random_password.k3s_token.result
kubelet-arg = "cloud-provider=external"
flannel-iface = "eth1"
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node-ip = cidrhost(hcloud_network_subnet.k3s.ip_range, 513 + count.index)
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node-label = var.automatically_upgrade_k3s ? ["k3s_upgrade=true"] : []
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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.k3s
]
}