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Introduce the component system for managing pre-installed addons

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* 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.
This commit is contained in:
Dalton Hubble
2024-05-18 15:05:33 -07:00
parent 563feacd29
commit b3c384fbc0
32 changed files with 185 additions and 92 deletions
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4
google-cloud/flatcar-linux/kubernetes/bootstrap.tf
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@ -1,11 +1,11 @@
# Kubernetes assets (kubeconfig, manifests)
module "bootstrap" {
source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=452bcf379d94f5d479c1dee281fd479872271415"
source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=a54fe54d9895f5dd51332b79533143f52792090f"
cluster_name = var.cluster_name
api_servers = [format("%s.%s", var.cluster_name, var.dns_zone)]
etcd_servers = [for fqdn in google_dns_record_set.etcds.*.name : trimsuffix(fqdn, ".")]
networking = var.install_container_networking ? var.networking : "none"
networking = var.networking
network_mtu = 1440
pod_cidr = var.pod_cidr
service_cidr = var.service_cidr

9
google-cloud/flatcar-linux/kubernetes/variables.tf
View File

@ -94,12 +94,6 @@ variable "networking" {
default = "cilium"
}
variable "install_container_networking" {
type = bool
description = "Install the chosen networking provider during cluster bootstrap (use false to self-manage)"
default = true
}
variable "pod_cidr" {
type = string
description = "CIDR IPv4 range to assign Kubernetes pods"
@ -157,6 +151,9 @@ variable "components" {
enable = optional(bool)
coredns = optional(map(any))
kube_proxy = optional(map(any))
flannel = optional(map(any))
calico = optional(map(any))
cilium = optional(map(any))
})
default = null
}