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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
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2
aws/container-linux/kubernetes/bootkube.tf
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@ -1,6 +1,6 @@
# Self-hosted Kubernetes assets (kubeconfig, manifests)
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 = "${var.cluster_name}"
api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]