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add k8s_external plugin to CoreDNS configuration (#4704)

pull/4983/head
Alex Barcelo 2019-07-16 09:53:23 +02:00 committed by Kubernetes Prow Robot
parent d9dedc2cd5
commit 99c5f7e013
4 changed files with 12 additions and 0 deletions
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4
docs/vars.md
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@ -61,6 +61,10 @@ following default cluster parameters:
bits in kube_pods_subnet dictates how many kube-nodes can be in cluster. bits in kube_pods_subnet dictates how many kube-nodes can be in cluster.
* *skydns_server* - Cluster IP for DNS (default is 10.233.0.3) * *skydns_server* - Cluster IP for DNS (default is 10.233.0.3)
* *skydns_server_secondary* - Secondary Cluster IP for CoreDNS used with coredns_dual deployment (default is 10.233.0.4) * *skydns_server_secondary* - Secondary Cluster IP for CoreDNS used with coredns_dual deployment (default is 10.233.0.4)
* *enable_coredns_k8s_external* - If enabled, it configures the [k8s_external plugin](https://coredns.io/plugins/k8s_external/)
on the CoreDNS service.
* *coredns_k8s_external_zone* - Zone that will be used when CoreDNS k8s_external plugin is enabled
(default is k8s_external.local)
* *cloud_provider* - Enable extra Kubelet option if operating inside GCE or * *cloud_provider* - Enable extra Kubelet option if operating inside GCE or
OpenStack (default is unset) OpenStack (default is unset)
* *kube_hostpath_dynamic_provisioner* - Required for use of PetSets type in * *kube_hostpath_dynamic_provisioner* - Required for use of PetSets type in

3
inventory/sample/group_vars/k8s-cluster/k8s-cluster.yml
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@ -135,6 +135,9 @@ dns_mode: coredns
enable_nodelocaldns: true enable_nodelocaldns: true
nodelocaldns_ip: 169.254.25.10 nodelocaldns_ip: 169.254.25.10
nodelocaldns_health_port: 9254 nodelocaldns_health_port: 9254
# Enable k8s_external plugin for CoreDNS
enable_coredns_k8s_external: false
coredns_k8s_external_zone: k8s_external.local
# Can be docker_dns, host_resolvconf or none # Can be docker_dns, host_resolvconf or none
resolvconf_mode: docker_dns resolvconf_mode: docker_dns

3
roles/kubernetes-apps/ansible/templates/coredns-config.yml.j2
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@ -30,6 +30,9 @@ data:
forward . /etc/resolv.conf { forward . /etc/resolv.conf {
prefer_udp prefer_udp
} }
{% endif %}
{% if enable_coredns_k8s_external %}
k8s_external {{ coredns_k8s_external_zone }}
{% endif %} {% endif %}
cache 30 cache 30
loop loop

2
roles/kubespray-defaults/defaults/main.yaml
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@ -89,6 +89,8 @@ kube_dns_servers:
dns_servers: "{{kube_dns_servers[dns_mode]}}" dns_servers: "{{kube_dns_servers[dns_mode]}}"
enable_coredns_k8s_external: false
coredns_k8s_external_zone: k8s_external.local
# Kubernetes configuration dirs and system namespace. # Kubernetes configuration dirs and system namespace.
# Those are where all the additional config stuff goes # Those are where all the additional config stuff goes