* Allow for more minimal base cluster setups, that manage CoreDNS or
kube-proxy as applications, with rolling updates, or deploy systems.
Or in the case of kube-proxy, its becoming more common to not install
it and instead use Cilium
* Add a `components` pass-through variable to configure pre-installed
components like kube-proxy and CoreDNS. These components can be
disabled (individually or together) to allow for managing components
with separate plan/apply processes or automations
* terraform-render-bootstrap manifest assets are now structured as
manifests/{coredns,kube-proxy,network} so adapt the controller
layout scripts accordingly
* This is similar to some changes in v1.29.2 that allowed for the
container networking provider manifests to be skipped
Related: https://github.com/poseidon/typhoon/pull/1419, https://github.com/poseidon/typhoon/pull/1421
* When `true`, the chosen container `networking` provider is installed during cluster bootstrap
* Set `false` to self-manage the container networking provider. This allows flannel, Calico, or Cilium
to be managed via Terraform (like any other Kubernetes resources). Nodes will be NotReady until you
apply the self-managed container networking provider. This may become the default in future.
* Set CNI networking to "none" to skip installing any CNI provider
(i.e. no flannel, Calico, or Cilium). In this mode, cluster nodes
will be NotReady until you add your own CNI stack
* Motivation: I now tend to manage CNI components as addon modules
just like other applications overlaid onto a cluster. It allows for
faster iteration and may eventually become the recommendation
* With Cilium v1.14, Cilium's kube-proxy partial mode changed to
either be enabled or disabled (not partial). This somtimes leaves
Cilium (and the host) unable to reach the kube-apiserver via the
in-cluster Kubernetes Service IP, until the host is rebooted
* As a workaround, configure Cilium to rely on external DNS resolvers
to find the IP address of the apiserver. This is less portable
and less "clean" than using in-cluster discovery, but also what
Cilium wants users to do. Revert this when the upstream issue
https://github.com/cilium/cilium/issues/27982 is resolved
* To accompany the restructure of the bare-metal modules to
allow discrete workers to be defined and attached to a cluster
(#1295), the `workers` variable (older way, used for defining
homogeneous workers inline) should be optional and default
to an empty list
* Add docs covering inline vs discrete metal workers
Fix#1301
* Add an internal `worker` module to the bare-metal module, to
allow individual bare-metal machines to be defined and joined
to an existing bare-metal cluster. This is similar to the "worker
pools" modules for adding sets of nodes to cloud (AWS, GCP, Azure)
clusters, but on metal, each piece of hardware is potentially
unique
New: Using the new `worker` module, a Kubernetes cluster can be defined
without any `workers` (i.e. just a control-plane). Use the `worker`
module to define each piece machine that should join the bare-metal
cluster and customize it in detail. This style is quite flexible and
suited for clusters with hardware that varies quite a bit.
```tf
module "mercury" {
source = "git::https://github.com/poseidon/typhoon//bare-metal/flatcar-linux/kubernetes?ref=v1.26.2"
# bare-metal
cluster_name = "mercury"
matchbox_http_endpoint = "http://matchbox.example.com"
os_channel = "flatcar-stable"
os_version = "2345.3.1"
# configuration
k8s_domain_name = "node1.example.com"
ssh_authorized_key = "ssh-rsa AAAAB3Nz..."
# machines
controllers = [{
name = "node1"
mac = "52:54:00:a1:9c:ae"
domain = "node1.example.com"
}]
}
```
```tf
module "mercury-node1" {
source = "git::https://github.com/poseidon/typhoon//bare-metal/flatcar-linux/kubernetes/worker?ref=v1.26.2"
cluster_name = "mercury"
# bare-metal
matchbox_http_endpoint = "http://matchbox.example.com"
os_channel = "flatcar-stable"
os_version = "2345.3.1"
# configuration
name = "node2"
mac = "52:54:00:b2:2f:86"
domain = "node2.example.com"
kubeconfig = module.mercury.kubeconfig
ssh_authorized_key = "ssh-rsa AAAAB3Nz..."
# optional
snippets = []
node_labels = []
node_tains = []
install_disk = "/dev/vda"
cached_install = false
}
```
For clusters with fairly similar hardware, you may continue to
define `workers` directly within the cluster definition. This
reduces some repetition, but is not quite as flexible.
```tf
module "mercury" {
source = "git::https://github.com/poseidon/typhoon//bare-metal/flatcar-linux/kubernetes?ref=v1.26.1"
# bare-metal
cluster_name = "mercury"
matchbox_http_endpoint = "http://matchbox.example.com"
os_channel = "flatcar-stable"
os_version = "2345.3.1"
# configuration
k8s_domain_name = "node1.example.com"
ssh_authorized_key = "ssh-rsa AAAAB3Nz..."
# machines
controllers = [{
name = "node1"
mac = "52:54:00:a1:9c:ae"
domain = "node1.example.com"
}]
workers = [
{
name = "node2",
mac = "52:54:00:b2:2f:86"
domain = "node2.example.com"
},
{
name = "node3",
mac = "52:54:00:c3:61:77"
domain = "node3.example.com"
}
]
}
```
Optional variables `snippets`, `worker_node_labels`, and
`worker_node_taints` are still defined as a map from machine name
to a list of snippets, labels, or taints respectively to allow some
degree of per-machine customization. However, fields like
`install_disk`, `kernel_args`, `cached_install` and future options
will not be designed this way. Instead, if your machines vary it
is recommended to use the new `worker` module to define each node
