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Add support for running a nodelocal dns cache (#3861)

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* Add support for running a nodelocal dns cache

After encountering dns issues in a cluster I was recently working on I
noticed Kubernetes 1.13 introduced support for running a nodelocal dns
cache.

I believe this can usefull for more people.

73b548db06
https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/0030-nodelocal-dns-cache.md

* Add requested changes

* Add additional requested changes + documentation

* Add requested changes after review

* Replace incorrect variable
This commit is contained in:
Thomas Nys
2018-12-11 02:28:03 +01:00
committed by Kubernetes Prow Robot
parent 7b674e0607
commit 3e3ee0aeb1
12 changed files with 223 additions and 0 deletions
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71
roles/kubernetes-apps/ansible/templates/nodelocaldns-config.yml.j2 Normal file
View File

@@ -0,0 +1,71 @@
apiVersion: v1
kind: ConfigMap
metadata:
name: nodelocaldns
namespace: kube-system
labels:
addonmanager.kubernetes.io/mode: EnsureExists
data:
Corefile: |
{{ dns_domain }}:53 {
errors
cache 30
reload
loop
bind {{ nodelocaldns_ip }}
{% if secondaryclusterIP is defined and dns_mode == 'coredns_dual' %}
forward . {{ clusterIP }} {{ secondaryclusterIP }} {
{% else %}
forward . {{ clusterIP }} {
{% endif %}
force_tcp
}
prometheus :9253
health {{ nodelocaldns_ip }}:8080
}
in-addr.arpa:53 {
errors
cache 30
reload
loop
bind {{ nodelocaldns_ip }}
{% if secondaryclusterIP is defined %}
forward . {{ clusterIP }} {{ secondaryclusterIP }} {
{% else %}
forward . {{ clusterIP }} {
{% endif %}
force_tcp
}
prometheus :9253
}
ip6.arpa:53 {
errors
cache 30
reload
loop
bind {{ nodelocaldns_ip }}
{% if secondaryclusterIP is defined %}
forward . {{ clusterIP }} {{ secondaryclusterIP }} {
{% else %}
forward . {{ clusterIP }} {
{% endif %}
force_tcp
}
prometheus :9253
}
.:53 {
errors
cache 30
reload
loop
bind {{ nodelocaldns_ip }}
{% if resolvconf_mode == 'host_resolvconf' and upstream_dns_servers is defined and upstream_dns_servers|length > 0 %}
forward . {{ upstream_dns_servers|join(' ') }} {
{% else %}
forward . /etc/resolv.conf {
{% endif %}
force_tcp
}
prometheus :9253
}