c12s-kubespray/roles/kubernetes-apps/ansible/templates/coredns-deployment.yml.j2
woopstar e40368ae2b Add CoreDNS support with various fixes
Added CoreDNS to downloads

Updated with labels. Should now work without RBAC too

Fix DNS settings on hosts

Rename CoreDNS service from kube-dns to coredns

Add rotate based on http://edgeofsanity.net/rant/2017/12/20/systemd-resolved-is-broken.html

Updated docs with CoreDNS info

Added labels and fixed minor settings from official yaml file: https://github.com/kubernetes/kubernetes/blob/release-1.9/cluster/addons/dns/coredns.yaml.sed

Added a secondary deployment and secondary service ip. This is to mitigate dns timeouts and create high resitency for failures. See discussion at 'https://github.com/coreos/coreos-kubernetes/issues/641#issuecomment-281174806'

Set dns list correct. Thanks to @whereismyjetpack

Only download KubeDNS or CoreDNS if selected

Move dns cleanup to its own file and import tasks based on dns mode

Fix install of KubeDNS when dnsmask_kubedns mode is selected

Add new dns option coredns_dual for dual stack deployment. Added variable to configure replicas deployed. Updated docs for dual stack deployment. Removed rotate option in resolv.conf.

Run DNS manifests for CoreDNS and KubeDNS

Set skydns servers on dual stack deployment

Use only one template for CoreDNS dual deployment

Set correct cluster ip for the dns server
2018-03-16 21:51:37 +01:00

81 lines
2.4 KiB
Django/Jinja

---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: coredns{{ coredns_ordinal_suffix | default('') }}
namespace: {{ system_namespace }}
labels:
k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
kubernetes.io/name: "CoreDNS"
spec:
replicas: {{ coredns_replicas }}
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 0
maxSurge: 10%
selector:
matchLabels:
k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
template:
metadata:
labels:
k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
annotations:
scheduler.alpha.kubernetes.io/critical-pod: ''
spec:
{% if rbac_enabled %}
serviceAccountName: coredns
{% endif %}
tolerations:
- key: node-role.kubernetes.io/master
effect: NoSchedule
- key: "CriticalAddonsOnly"
operator: "Exists"
containers:
- name: coredns
image: "{{ coredns_image_repo }}:{{ coredns_image_tag }}"
imagePullPolicy: {{ k8s_image_pull_policy }}
resources:
# TODO: Set memory limits when we've profiled the container for large
# clusters, then set request = limit to keep this container in
# guaranteed class. Currently, this container falls into the
# "burstable" category so the kubelet doesn't backoff from restarting it.
limits:
memory: {{ dns_memory_limit }}
requests:
cpu: {{ dns_cpu_requests }}
memory: {{ dns_memory_requests }}
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile