terraform-hcloud-kube-hetzner/servers.tf

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resource "hcloud_server" "control_planes" {
count = var.servers_num - 1
name = "k3s-control-plane-${count.index + 1}"
image = data.hcloud_image.linux.name
rescue = "linux64"
server_type = var.control_plane_server_type
location = var.location
ssh_keys = [hcloud_ssh_key.k3s.id]
firewall_ids = [hcloud_firewall.k3s.id]
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placement_group_id = hcloud_placement_group.k3s.id
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labels = {
"provisioner" = "terraform",
"engine" = "k3s",
}
connection {
user = "root"
private_key = local.ssh_private_key
agent_identity = local.ssh_identity
host = self.ipv4_address
}
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provisioner "file" {
content = templatefile("${path.module}/templates/config.ign.tpl", {
name = self.name
ssh_public_key = local.ssh_public_key
})
destination = "/root/config.ign"
}
# Install MicroOS
provisioner "remote-exec" {
inline = local.MicroOS_install_commands
}
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# Issue a reboot command
provisioner "local-exec" {
command = "ssh ${local.ssh_args} root@${self.ipv4_address} '(sleep 2; reboot)&'; sleep 3"
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}
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# Wait for MicroOS to reboot and be ready
provisioner "local-exec" {
command = <<-EOT
until ssh ${local.ssh_args} -o ConnectTimeout=2 root@${self.ipv4_address} true 2> /dev/null
do
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echo "Waiting for MicroOS to reboot and become available..."
sleep 2
done
EOT
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}
# Generating k3s server config file
provisioner "file" {
content = yamlencode({
node-name = self.name
server = "https://${local.first_control_plane_network_ip}:6443"
cluster-init = true
disable-cloud-controller = true
disable = "servicelb, local-storage"
flannel-iface = "eth1"
kubelet-arg = "cloud-provider=external"
node-ip = cidrhost(hcloud_network_subnet.k3s.ip_range, 3 + count.index)
advertise-address = cidrhost(hcloud_network_subnet.k3s.ip_range, 3 + count.index)
tls-san = cidrhost(hcloud_network_subnet.k3s.ip_range, 3 + count.index)
token = random_password.k3s_token.result
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node-taint = var.allow_scheduling_on_control_plane ? [] : ["node-role.kubernetes.io/master:NoSchedule"]
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})
destination = "/etc/rancher/k3s/config.yaml"
}
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# Run an other control plane server
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provisioner "remote-exec" {
inline = [
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# set the hostname in a persistent fashion
"hostnamectl set-hostname ${self.name}",
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# first we disable automatic reboot (after transactional updates), and configure the reboot method as kured
"rebootmgrctl set-strategy off && echo 'REBOOT_METHOD=kured' > /etc/transactional-update.conf",
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# then then we start k3s in server mode and join the cluster
"systemctl enable k3s-server",
<<-EOT
until systemctl status k3s-server > /dev/null
do
systemctl start k3s-server
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echo "Waiting on other 'learning' control planes, patience is the mother of all virtues..."
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sleep 2
done
EOT
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]
}
network {
network_id = hcloud_network.k3s.id
ip = cidrhost(hcloud_network_subnet.k3s.ip_range, 3 + count.index)
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}
depends_on = [
hcloud_server.first_control_plane,
hcloud_network_subnet.k3s
]
}