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Adjust Google Cloud worker health checks to use kube-proxy healthz
* Change the workers managed instance group to health check nodes via HTTP probe of the kube-proxy port 10256 /healthz endpoints * Advantages: kube-proxy is a lower value target (in case there were bugs in firewalls) that Kubelet, its more representative than health checking Kubelet (Kubelet must run AND kube-proxy Daemonset must be healthy), and its already used by kube-proxy liveness probes (better discoverability via kubectl or alerts on pods crashlooping) * Another motivator is that GKE clusters also use kube-proxy port 10256 checks to assess node health
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Dalton Hubble
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CHANGES.md
16
CHANGES.md
@ -21,7 +21,7 @@ Notable changes between versions.
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### Flatcar Linux
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* Migrate Flatcar Linux from Ignition spec v2.3.0 to v3.3.0 (**action required**)
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* Migrate Flatcar Linux from Ignition spec v2.3.0 to v3.3.0 ([#1196](https://github.com/poseidon/typhoon/pull/1196)) (**action required**)
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* Flatcar Linux 3185.0.0+ [supports](https://flatcar-linux.org/docs/latest/provisioning/ignition/specification/#ignition-v3) Ignition v3.x specs (which are rendered from Butane Configs, like Fedora CoreOS)
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* `poseidon/ct` v0.11.0 [supports](https://github.com/poseidon/terraform-provider-ct/pull/131) the `flatcar` Butane Config variant
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* Require poseidon v0.11+ and Flatcar Linux 3185.0.0+
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@ -35,8 +35,8 @@ version: 1.0.0
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### AWS
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* [Refresh](https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-instance-refresh.html) instances in autoscaling group when launch configuration changes
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* Changes to worker launch configurations start an autoscaling group instance refresh to replace instances
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* [Refresh](https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-instance-refresh.html) instances in autoscaling group when launch configuration changes ([#1208](https://github.com/poseidon/typhoon/pull/1208)) (**important**)
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* Worker launch configuration changes start an autoscaling group instance refresh to replace instances
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* Instance refresh creates surge instances, waits for a warm-up period, then deletes old instances
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* Changing `worker_type`, `disk_*`, `worker_price`, `worker_target_groups`, or Butane `worker_snippets` on existing worker nodes will replace instances
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* New AMIs or changing `os_stream` will be ignored, to allow Fedora CoreOS or Flatcar Linux to keep themselves updated
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@ -47,16 +47,16 @@ version: 1.0.0
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### Google
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* [Roll](https://cloud.google.com/compute/docs/instance-groups/rolling-out-updates-to-managed-instance-groups) instance template changes to worker managed instance groups ([#1207](https://github.com/poseidon/typhoon/pull/1207)) (**important**)
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* Changes to worker instance templates roll out by gradually replacing instances
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* Worker instance template changes roll out by gradually replacing instances
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* Automatic rollouts create surge instances, wait for Kubelet health checks, then delete old instances (0 unavailable instances)
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* Changing `worker_type`, `disk_size`, `preemptible`, or Butane `worker_snippets` on existing worker nodes will replace instances
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* Changing `worker_type`, `disk_size`, `worker_preemptible`, or Butane `worker_snippets` on existing worker nodes will replace instances
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* New AMIs or changing `os_stream` will be ignored, to allow Fedora CoreOS or Flatcar Linux to keep themselves updated
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* Previously, new instance templates were made in the same way, but not applied to instances unless manually replaced
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* Add health checks to worker managed instance groups (i.e. "autohealing") ([#1207](https://github.com/poseidon/typhoon/pull/1207))
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* Use SSL health checks to probe the Kubelet every 30s
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* Use health checks to probe kube-proxy every 30s
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* Replace worker nodes that fail the health check 6 times (3min)
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* Name `kube-apiserver` and `kubelet` health checks consistently ([#1207](https://github.com/poseidon/typhoon/pull/1207))
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* Use name `${cluster_name}-apiserver-health` and `${cluster_name}-kubelet-health`
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* Name `kube-apiserver` and `worker` health checks consistently ([#1207](https://github.com/poseidon/typhoon/pull/1207))
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* Use name `${cluster_name}-apiserver-health` and `${cluster_name}-worker-health`
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* Rename managed instance group from `${cluster_name}-worker-group` to `${cluster_name}-worker` ([#1207](https://github.com/poseidon/typhoon/pull/1207))
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* Fix bug provisioning clusters with multiple controller nodes ([#1195](https://github.com/poseidon/typhoon/pull/1195))
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@ -196,13 +196,13 @@ resource "google_compute_firewall" "allow-ingress" {
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target_tags = ["${var.cluster_name}-worker"]
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}
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resource "google_compute_firewall" "google-kubelet-health-checks" {
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name = "${var.cluster_name}-kubelet-health"
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resource "google_compute_firewall" "google-worker-health-checks" {
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name = "${var.cluster_name}-worker-health"
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network = google_compute_network.network.name
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allow {
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protocol = "tcp"
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ports = [10250]
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ports = [10256]
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}
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# https://cloud.google.com/compute/docs/instance-groups/autohealing-instances-in-migs
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@ -36,14 +36,14 @@ resource "google_compute_region_instance_group_manager" "workers" {
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auto_healing_policies {
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health_check = google_compute_health_check.worker.id
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initial_delay_sec = 120
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initial_delay_sec = 300
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}
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}
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# Health check for worker Kubelet
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# Health check for worker node
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resource "google_compute_health_check" "worker" {
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name = "${var.name}-kubelet-health"
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description = "Health check for worker Kubelet"
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name = "${var.name}-worker-health"
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description = "Health check for worker node"
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timeout_sec = 20
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check_interval_sec = 30
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@ -51,8 +51,9 @@ resource "google_compute_health_check" "worker" {
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healthy_threshold = 1
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unhealthy_threshold = 6
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ssl_health_check {
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port = "10250"
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http_health_check {
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port = "10256"
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request_path = "/healthz"
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}
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}
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@ -196,13 +196,13 @@ resource "google_compute_firewall" "allow-ingress" {
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target_tags = ["${var.cluster_name}-worker"]
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}
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resource "google_compute_firewall" "google-kubelet-health-checks" {
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name = "${var.cluster_name}-kubelet-health"
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resource "google_compute_firewall" "google-worker-health-checks" {
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name = "${var.cluster_name}-worker-health"
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network = google_compute_network.network.name
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allow {
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protocol = "tcp"
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ports = [10250]
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ports = [10256]
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}
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# https://cloud.google.com/compute/docs/instance-groups/autohealing-instances-in-migs
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@ -36,14 +36,14 @@ resource "google_compute_region_instance_group_manager" "workers" {
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auto_healing_policies {
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health_check = google_compute_health_check.worker.id
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initial_delay_sec = 120
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initial_delay_sec = 300
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}
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}
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# Health check for worker Kubelet
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resource "google_compute_health_check" "worker" {
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name = "${var.name}-kubelet-health"
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description = "Health check for worker Kubelet"
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name = "${var.name}-worker-health"
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description = "Health check for worker node"
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timeout_sec = 20
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check_interval_sec = 30
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@ -51,8 +51,9 @@ resource "google_compute_health_check" "worker" {
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healthy_threshold = 1
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unhealthy_threshold = 6
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ssl_health_check {
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port = "10250"
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http_health_check {
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port = "10256"
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request_path = "/healthz"
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}
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}
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