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Raise CoreDNS replica count to 2 or more

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* Run at least two replicas of CoreDNS to better support
rolling updates (previously, kube-dns had a pod nanny)
* On multi-master clusters, set the CoreDNS replica count
to match the number of masters (e.g. a 3-master cluster
previously used replicas:1, now replicas:3)
* Add AntiAffinity preferred rule to favor distributing
CoreDNS pods across controller nodes nodes
This commit is contained in:
Dalton Hubble 2018-10-13 16:21:22 -07:00
parent 43fe78a2cc
commit 55bb4dfba6
10 changed files with 11 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
CHANGES.md
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@ -9,6 +9,8 @@ Notable changes between versions.
* Update Calico from v3.2.1 to v3.2.3 * Update Calico from v3.2.1 to v3.2.3
* On multi-controller clusters, raise scheduler and controller-manager replics to equal the number of controller nodes ([#312](https://github.com/poseidon/typhoon/pull/312)) * On multi-controller clusters, raise scheduler and controller-manager replics to equal the number of controller nodes ([#312](https://github.com/poseidon/typhoon/pull/312))
* Single-controller clusters continue to run 2 replicas as before * Single-controller clusters continue to run 2 replicas as before
* Raise default CoreDNS replica count to the larger of 2 or the number of controller nodes ([#313](https://github.com/poseidon/typhoon/pull/313))
* Add AntiAffinity preferred rule to favor spreading CoreDNS pods
#### DigitalOcean #### DigitalOcean

2
aws/container-linux/kubernetes/bootkube.tf
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@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests) # Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" { module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=7797377d50b2f770b59adf6aae43045c43453a8a" source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=f7c2f8d590dcca0cb9bd4de15d765cad29109455"
cluster_name = "${var.cluster_name}" cluster_name = "${var.cluster_name}"
api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"] api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]

2
aws/fedora-atomic/kubernetes/bootkube.tf
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@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests) # Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" { module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=7797377d50b2f770b59adf6aae43045c43453a8a" source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=f7c2f8d590dcca0cb9bd4de15d765cad29109455"
cluster_name = "${var.cluster_name}" cluster_name = "${var.cluster_name}"
api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"] api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]

2
azure/container-linux/kubernetes/bootkube.tf
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@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests) # Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" { module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=7797377d50b2f770b59adf6aae43045c43453a8a" source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=f7c2f8d590dcca0cb9bd4de15d765cad29109455"
cluster_name = "${var.cluster_name}" cluster_name = "${var.cluster_name}"
api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"] api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]

2
bare-metal/container-linux/kubernetes/bootkube.tf
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@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests) # Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" { module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=7797377d50b2f770b59adf6aae43045c43453a8a" source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=f7c2f8d590dcca0cb9bd4de15d765cad29109455"
cluster_name = "${var.cluster_name}" cluster_name = "${var.cluster_name}"
api_servers = ["${var.k8s_domain_name}"] api_servers = ["${var.k8s_domain_name}"]

2
bare-metal/fedora-atomic/kubernetes/bootkube.tf
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@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests) # Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" { module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=7797377d50b2f770b59adf6aae43045c43453a8a" source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=f7c2f8d590dcca0cb9bd4de15d765cad29109455"
cluster_name = "${var.cluster_name}" cluster_name = "${var.cluster_name}"
api_servers = ["${var.k8s_domain_name}"] api_servers = ["${var.k8s_domain_name}"]

2
digital-ocean/container-linux/kubernetes/bootkube.tf
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@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests) # Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" { module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=7797377d50b2f770b59adf6aae43045c43453a8a" source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=f7c2f8d590dcca0cb9bd4de15d765cad29109455"
cluster_name = "${var.cluster_name}" cluster_name = "${var.cluster_name}"
api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"] api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]

2
digital-ocean/fedora-atomic/kubernetes/bootkube.tf
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@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests) # Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" { module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=7797377d50b2f770b59adf6aae43045c43453a8a" source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=f7c2f8d590dcca0cb9bd4de15d765cad29109455"
cluster_name = "${var.cluster_name}" cluster_name = "${var.cluster_name}"
api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"] api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]

2
google-cloud/container-linux/kubernetes/bootkube.tf
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@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests) # Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" { module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=7797377d50b2f770b59adf6aae43045c43453a8a" source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=f7c2f8d590dcca0cb9bd4de15d765cad29109455"
cluster_name = "${var.cluster_name}" cluster_name = "${var.cluster_name}"
api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"] api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]

2
google-cloud/fedora-atomic/kubernetes/bootkube.tf
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@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests) # Self-hosted Kubernetes assets (kubeconfig, manifests)
module "bootkube" { module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=7797377d50b2f770b59adf6aae43045c43453a8a" source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=f7c2f8d590dcca0cb9bd4de15d765cad29109455"
cluster_name = "${var.cluster_name}" cluster_name = "${var.cluster_name}"
api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"] api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]