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b3c384fbc0
* Previously: Typhoon provisions clusters with kube-system components
like CoreDNS, kube-proxy, and a chosen CNI provider (among flannel,
Calico, or Cilium) pre-installed. This is convenient since clusters
come with "batteries included". But it also means upgrading these
components is generally done in lock-step, by upgrading to a new
Typhoon / Kubernetes release
* It can be valuable to manage these components with a separate
plan/apply process or through automations and deploy systems. For
example, this allows managing CoreDNS separately from the cluster's
lifecycle.
* These "components" will continue to be pre-installed by default,
but a new `components` variable allows them to be disabled and
managed as "addons", components you apply after cluster creation
and manage on a rolling basis. For some of these, we may provide
Terraform modules to aide in managing these components.
```
module "cluster" {
# defaults
components = {
enable = true
coredns = {
enable = true
}
kube_proxy = {
enable = true
}
# Only the CNI set in var.networking will be installed
flannel = {
enable = true
}
calico = {
enable = true
}
cilium = {
enable = true
}
}
}
```
An earlier variable `install_container_networking = true/false` has
been removed, since it can now be achieved with this more extensible
and general components mechanism by setting the chosen networking
provider enable field to false.
124 lines
3.1 KiB
HCL
124 lines
3.1 KiB
HCL
variable "cluster_name" {
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type = string
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description = "Unique cluster name (prepended to dns_zone)"
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}
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# Digital Ocean
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variable "region" {
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type = string
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description = "Digital Ocean region (e.g. nyc1, sfo2, fra1, tor1)"
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}
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variable "dns_zone" {
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type = string
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description = "Digital Ocean domain (i.e. DNS zone) (e.g. do.example.com)"
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}
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# instances
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variable "controller_count" {
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type = number
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description = "Number of controllers (i.e. masters)"
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default = 1
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}
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variable "worker_count" {
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type = number
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description = "Number of workers"
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default = 1
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}
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variable "controller_type" {
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type = string
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description = "Droplet type for controllers (e.g. s-2vcpu-2gb, s-2vcpu-4gb, s-4vcpu-8gb)."
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default = "s-2vcpu-2gb"
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}
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variable "worker_type" {
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type = string
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description = "Droplet type for workers (e.g. s-1vcpu-2gb, s-2vcpu-2gb)"
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default = "s-1vcpu-2gb"
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}
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variable "os_image" {
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type = string
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description = "Flatcar Linux image for instances (e.g. custom-image-id)"
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}
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variable "controller_snippets" {
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type = list(string)
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description = "Controller Container Linux Config snippets"
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default = []
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}
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variable "worker_snippets" {
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type = list(string)
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description = "Worker Container Linux Config snippets"
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default = []
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}
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# configuration
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variable "ssh_fingerprints" {
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type = list(string)
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description = "SSH public key fingerprints. (e.g. see `ssh-add -l -E md5`)"
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}
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variable "networking" {
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type = string
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description = "Choice of networking provider (flannel, calico, or cilium)"
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default = "cilium"
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}
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variable "pod_cidr" {
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type = string
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description = "CIDR IPv4 range to assign Kubernetes pods"
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default = "10.2.0.0/16"
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}
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variable "service_cidr" {
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type = string
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description = <<EOD
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CIDR IPv4 range to assign Kubernetes services.
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The 1st IP will be reserved for kube_apiserver, the 10th IP will be reserved for coredns.
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EOD
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default = "10.3.0.0/16"
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}
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variable "enable_reporting" {
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type = bool
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description = "Enable usage or analytics reporting to upstreams (Calico)"
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default = false
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}
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variable "enable_aggregation" {
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type = bool
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description = "Enable the Kubernetes Aggregation Layer"
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default = true
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}
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# unofficial, undocumented, unsupported
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variable "cluster_domain_suffix" {
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type = string
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description = "Queries for domains with the suffix will be answered by coredns. Default is cluster.local (e.g. foo.default.svc.cluster.local) "
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default = "cluster.local"
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}
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variable "components" {
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description = "Configure pre-installed cluster components"
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# Component configs are passed through to terraform-render-bootstrap,
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# which handles type enforcement and defines defaults
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# https://github.com/poseidon/terraform-render-bootstrap/blob/main/variables.tf#L95
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type = object({
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enable = optional(bool)
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coredns = optional(map(any))
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kube_proxy = optional(map(any))
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flannel = optional(map(any))
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calico = optional(map(any))
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cilium = optional(map(any))
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})
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default = null
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}
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