3e3ee0aeb1
* 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
72 lines
1.7 KiB
Django/Jinja
72 lines
1.7 KiB
Django/Jinja
apiVersion: v1
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kind: ConfigMap
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metadata:
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name: nodelocaldns
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namespace: kube-system
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labels:
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addonmanager.kubernetes.io/mode: EnsureExists
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data:
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Corefile: |
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{{ dns_domain }}:53 {
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errors
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cache 30
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reload
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loop
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bind {{ nodelocaldns_ip }}
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{% if secondaryclusterIP is defined and dns_mode == 'coredns_dual' %}
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forward . {{ clusterIP }} {{ secondaryclusterIP }} {
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{% else %}
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forward . {{ clusterIP }} {
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{% endif %}
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force_tcp
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}
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prometheus :9253
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health {{ nodelocaldns_ip }}:8080
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}
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in-addr.arpa:53 {
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errors
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cache 30
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reload
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loop
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bind {{ nodelocaldns_ip }}
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{% if secondaryclusterIP is defined %}
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forward . {{ clusterIP }} {{ secondaryclusterIP }} {
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{% else %}
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forward . {{ clusterIP }} {
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{% endif %}
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force_tcp
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}
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prometheus :9253
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}
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ip6.arpa:53 {
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errors
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cache 30
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reload
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loop
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bind {{ nodelocaldns_ip }}
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{% if secondaryclusterIP is defined %}
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forward . {{ clusterIP }} {{ secondaryclusterIP }} {
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{% else %}
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forward . {{ clusterIP }} {
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{% endif %}
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force_tcp
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}
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prometheus :9253
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}
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.:53 {
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errors
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cache 30
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reload
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loop
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bind {{ nodelocaldns_ip }}
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{% if resolvconf_mode == 'host_resolvconf' and upstream_dns_servers is defined and upstream_dns_servers|length > 0 %}
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forward . {{ upstream_dns_servers|join(' ') }} {
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{% else %}
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forward . /etc/resolv.conf {
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{% endif %}
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force_tcp
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}
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prometheus :9253
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}
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