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Add optional cluster_domain_suffix variable

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* Allow kube-dns to respond to DNS queries with a custom
suffix, instead of the default 'cluster.local'
* Useful when multiple clusters exist on the same local
network and wish to query services on one another
This commit is contained in:
Barak Michener
2017-12-09 13:36:59 -08:00
committed by Dalton Hubble
parent 495e33e213
commit e79088baa0
33 changed files with 119 additions and 57 deletions
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17
digital-ocean/container-linux/kubernetes/bootkube.tf
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@ -2,12 +2,13 @@
module "bootkube" {
source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=v0.9.1"
cluster_name = "${var.cluster_name}"
api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]
etcd_servers = "${digitalocean_record.etcds.*.fqdn}"
asset_dir = "${var.asset_dir}"
networking = "${var.networking}"
network_mtu = 1440
pod_cidr = "${var.pod_cidr}"
service_cidr = "${var.service_cidr}"
cluster_name = "${var.cluster_name}"
api_servers = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]
etcd_servers = "${digitalocean_record.etcds.*.fqdn}"
asset_dir = "${var.asset_dir}"
networking = "${var.networking}"
network_mtu = 1440
pod_cidr = "${var.pod_cidr}"
service_cidr = "${var.service_cidr}"
cluster_domain_suffix = "${var.cluster_domain_suffix}"
}

2
digital-ocean/container-linux/kubernetes/cl/controller.yaml.tmpl
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@ -84,7 +84,7 @@ systemd:
--anonymous-auth=false \
--client-ca-file=/etc/kubernetes/ca.crt \
--cluster_dns=${k8s_dns_service_ip} \
--cluster_domain=cluster.local \
--cluster_domain=${cluster_domain_suffix} \
--cni-conf-dir=/etc/kubernetes/cni/net.d \
--exit-on-lock-contention \
--hostname-override=$${COREOS_DIGITALOCEAN_IPV4_PRIVATE_0} \

2
digital-ocean/container-linux/kubernetes/cl/worker.yaml.tmpl
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@ -60,7 +60,7 @@ systemd:
--anonymous-auth=false \
--client-ca-file=/etc/kubernetes/ca.crt \
--cluster_dns=${k8s_dns_service_ip} \
--cluster_domain=cluster.local \
--cluster_domain=${cluster_domain_suffix} \
--cni-conf-dir=/etc/kubernetes/cni/net.d \
--exit-on-lock-contention \
--hostname-override=$${COREOS_DIGITALOCEAN_IPV4_PRIVATE_0} \

5
digital-ocean/container-linux/kubernetes/controllers.tf
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@ -69,8 +69,9 @@ data "template_file" "controller_config" {
etcd_domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"
# etcd0=https://cluster-etcd0.example.com,etcd1=https://cluster-etcd1.example.com,...
etcd_initial_cluster = "${join(",", formatlist("%s=https://%s:2380", null_resource.repeat.*.triggers.name, null_resource.repeat.*.triggers.domain))}"
k8s_dns_service_ip = "${cidrhost(var.service_cidr, 10)}"
etcd_initial_cluster = "${join(",", formatlist("%s=https://%s:2380", null_resource.repeat.*.triggers.name, null_resource.repeat.*.triggers.domain))}"
k8s_dns_service_ip = "${cidrhost(var.service_cidr, 10)}"
cluster_domain_suffix = "${var.cluster_domain_suffix}"
}
}

7
digital-ocean/container-linux/kubernetes/variables.tf
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@ -76,3 +76,10 @@ EOD
type = "string"
default = "10.3.0.0/16"
}
variable "cluster_domain_suffix" {
description = "Queries for domains with the suffix will be answered by kube-dns. Default is cluster.local (e.g. foo.default.svc.cluster.local) "
type = "string"
default = "cluster.local"
}

5
digital-ocean/container-linux/kubernetes/workers.tf
View File

@ -43,8 +43,9 @@ data "template_file" "worker_config" {
template = "${file("${path.module}/cl/worker.yaml.tmpl")}"
vars = {
k8s_dns_service_ip = "${cidrhost(var.service_cidr, 10)}"
k8s_etcd_service_ip = "${cidrhost(var.service_cidr, 15)}"
k8s_dns_service_ip = "${cidrhost(var.service_cidr, 10)}"
k8s_etcd_service_ip = "${cidrhost(var.service_cidr, 15)}"
cluster_domain_suffix = "${var.cluster_domain_suffix}"
}
}