Minimal and free Kubernetes distribution with Terraform
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Dalton Hubble 275fc0f9e8 Disable LocalStorageCapacityIsolationFSQuotaMonitoring feature
* Kubernetes v1.25.0 moved the LocalStorageCapacityIsolationFSQuotaMonitoring
feature from alpha to beta, but it breaks Kubelet updating ConfigMaps in
Pods, as shown by conformance tests
* Kubernetes is rolling LocalStorageCapacityIsolationFSQuotaMonitoring back
to alpha so its not enabled by default, but that will require a release
* Disable the feature gate directly as a workaround for now to make
Kubernetes v1.25.0 usable

```
FailedMount: MountVolume.SetUp failed for volume "configmap-volume" : requesting quota on existing directory /var/lib/kubelet/pods/f09fae17-ff16-4a05-aab3-7b897cb5b732/volumes/kubernetes.io~configmap/configmap-volume but different pod 673ad247-abf0-434e-99eb-1c3f57d7fdaa a4568e94-2b2d-438f-a4bd-c9edc814e478
```

Rel:

* https://github.com/kubernetes/kubernetes/pull/112076
* https://github.com/kubernetes/kubernetes/pull/107329
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Typhoon Release Stars Sponsors Twitter

Typhoon is a minimal and free Kubernetes distribution.

  • Minimal, stable base Kubernetes distribution
  • Declarative infrastructure and configuration
  • Free (freedom and cost) and privacy-respecting
  • Practical for labs, datacenters, and clouds

Typhoon distributes upstream Kubernetes, architectural conventions, and cluster addons, much like a GNU/Linux distribution provides the Linux kernel and userspace components.

Features

Modules

Typhoon provides a Terraform Module for each supported operating system and platform.

Typhoon is available for Fedora CoreOS.

Platform Operating System Terraform Module Status
AWS Fedora CoreOS aws/fedora-coreos/kubernetes stable
Azure Fedora CoreOS azure/fedora-coreos/kubernetes alpha
Bare-Metal Fedora CoreOS bare-metal/fedora-coreos/kubernetes stable
DigitalOcean Fedora CoreOS digital-ocean/fedora-coreos/kubernetes beta
Google Cloud Fedora CoreOS google-cloud/fedora-coreos/kubernetes stable
Platform Operating System Terraform Module Status
AWS Fedora CoreOS (ARM64) aws/fedora-coreos/kubernetes alpha

Typhoon is available for Flatcar Linux.

Platform Operating System Terraform Module Status
AWS Flatcar Linux aws/flatcar-linux/kubernetes stable
Azure Flatcar Linux azure/flatcar-linux/kubernetes alpha
Bare-Metal Flatcar Linux bare-metal/flatcar-linux/kubernetes stable
DigitalOcean Flatcar Linux digital-ocean/flatcar-linux/kubernetes beta
Google Cloud Flatcar Linux google-cloud/flatcar-linux/kubernetes stable
Platform Operating System Terraform Module Status
AWS Flatcar Linux (ARM64) aws/flatcar-linux/kubernetes alpha

Documentation

Usage

Define a Kubernetes cluster by using the Terraform module for your chosen platform and operating system. Here's a minimal example:

module "yavin" {
  source = "git::https://github.com/poseidon/typhoon//google-cloud/fedora-coreos/kubernetes?ref=v1.25.0"

  # Google Cloud
  cluster_name  = "yavin"
  region        = "us-central1"
  dns_zone      = "example.com"
  dns_zone_name = "example-zone"

  # configuration
  ssh_authorized_key = "ssh-ed25519 AAAAB3Nz..."

  # optional
  worker_count = 2
  worker_preemptible = true
}

# Obtain cluster kubeconfig
resource "local_file" "kubeconfig-yavin" {
  content  = module.yavin.kubeconfig-admin
  filename = "/home/user/.kube/configs/yavin-config"
}

Initialize modules, plan the changes to be made, and apply the changes.

$ terraform init
$ terraform plan
Plan: 62 to add, 0 to change, 0 to destroy.
$ terraform apply
Apply complete! Resources: 62 added, 0 changed, 0 destroyed.

In 4-8 minutes (varies by platform), the cluster will be ready. This Google Cloud example creates a yavin.example.com DNS record to resolve to a network load balancer across controller nodes.

$ export KUBECONFIG=/home/user/.kube/configs/yavin-config
$ kubectl get nodes
NAME                                       ROLES    STATUS  AGE  VERSION
yavin-controller-0.c.example-com.internal  <none>   Ready   6m   v1.25.0
yavin-worker-jrbf.c.example-com.internal   <none>   Ready   5m   v1.25.0
yavin-worker-mzdm.c.example-com.internal   <none>   Ready   5m   v1.25.0

List the pods.

$ kubectl get pods --all-namespaces
NAMESPACE     NAME                                      READY  STATUS    RESTARTS  AGE
kube-system   calico-node-1cs8z                         2/2    Running   0         6m
kube-system   calico-node-d1l5b                         2/2    Running   0         6m
kube-system   calico-node-sp9ps                         2/2    Running   0         6m
kube-system   coredns-1187388186-zj5dl                  1/1    Running   0         6m
kube-system   coredns-1187388186-dkh3o                  1/1    Running   0         6m
kube-system   kube-apiserver-controller-0               1/1    Running   0         6m
kube-system   kube-controller-manager-controller-0      1/1    Running   0         6m
kube-system   kube-proxy-117v6                          1/1    Running   0         6m
kube-system   kube-proxy-9886n                          1/1    Running   0         6m
kube-system   kube-proxy-njn47                          1/1    Running   0         6m
kube-system   kube-scheduler-controller-0               1/1    Running   0         6m

Non-Goals

Typhoon is strict about minimalism, maturity, and scope. These are not in scope:

  • In-place Kubernetes Upgrades
  • Adding every possible option
  • Openstack or Mesos platforms

Help

Schedule a meeting via Github Sponsors to discuss your use case.

Motivation

Typhoon powers the author's cloud and colocation clusters. The project has evolved through operational experience and Kubernetes changes. Typhoon is shared under a free license to allow others to use the work freely and contribute to its upkeep.

Typhoon addresses real world needs, which you may share. It is honest about limitations or areas that aren't mature yet. It avoids buzzword bingo and hype. It does not aim to be the one-solution-fits-all distro. An ecosystem of Kubernetes distributions is healthy.

Social Contract

Typhoon is not a product, trial, or free-tier. Typhoon does not offer support, services, or charge money. And Typhoon is independent of operating system or platform vendors.

Typhoon clusters will contain only free components. Cluster components will not collect data on users without their permission.

Sponsors

Poseidon's Github Sponsors support the infrastructure and operational costs of providing Typhoon.


If you'd like your company here, please contact dghubble at psdn.io.