c12s-kubespray/roles/kubernetes-apps/ansible/templates/nodelocaldns-second-daemonset.yml.j2
Cristian Calin 039205560a
nodelocaldns: allow a secondary pod for nodelocaldns for local-HA (#8100)
* nodelocaldns: allow a secondary pod for nodelocaldns for local-HA

* CI: add job to test nodelocaldns secondary
2021-11-09 09:57:47 -08:00

103 lines
3.2 KiB
Django/Jinja

apiVersion: apps/v1
kind: DaemonSet
metadata:
name: nodelocaldns-second
namespace: kube-system
labels:
k8s-app: kube-dns
addonmanager.kubernetes.io/mode: Reconcile
spec:
selector:
matchLabels:
k8s-app: nodelocaldns-second
template:
metadata:
labels:
k8s-app: nodelocaldns-second
annotations:
prometheus.io/scrape: 'true'
prometheus.io/port: '{{ nodelocaldns_secondary_prometheus_port }}'
spec:
nodeSelector:
{{ nodelocaldns_ds_nodeselector }}
priorityClassName: system-cluster-critical
serviceAccountName: nodelocaldns
hostNetwork: true
dnsPolicy: Default # Don't use cluster DNS.
tolerations:
- effect: NoSchedule
operator: "Exists"
- effect: NoExecute
operator: "Exists"
containers:
- name: node-cache
image: "{{ nodelocaldns_image_repo }}:{{ nodelocaldns_image_tag }}"
resources:
limits:
memory: {{ nodelocaldns_memory_limit }}
requests:
cpu: {{ nodelocaldns_cpu_requests }}
memory: {{ nodelocaldns_memory_requests }}
args: [ "-localip", "{{ nodelocaldns_ip }}", "-conf", "/etc/coredns/Corefile", "-upstreamsvc", "coredns", "-skipteardown" ]
securityContext:
privileged: true
{% if nodelocaldns_bind_metrics_host_ip %}
env:
- name: MY_HOST_IP
valueFrom:
fieldRef:
fieldPath: status.hostIP
{% endif %}
livenessProbe:
httpGet:
host: {{ nodelocaldns_ip }}
path: /health
port: {{ nodelocaldns_health_port }}
scheme: HTTP
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 10
readinessProbe:
httpGet:
host: {{ nodelocaldns_ip }}
path: /health
port: {{ nodelocaldns_health_port }}
scheme: HTTP
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 10
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
- name: xtables-lock
mountPath: /run/xtables.lock
lifecycle:
preStop:
exec:
command:
- sh
- -c
- sleep {{ nodelocaldns_secondary_skew_seconds }} && kill -9 1
volumes:
- name: config-volume
configMap:
name: nodelocaldns
items:
- key: Corefile-second
path: Corefile
{% if dns_etchosts | default(None) %}
- key: hosts
path: hosts
{% endif %}
- name: xtables-lock
hostPath:
path: /run/xtables.lock
type: FileOrCreate
# Implement a time skew between the main nodelocaldns and this secondary.
# Since the two nodelocaldns instances share the :53 port, we want to keep
# at least one running at any time enven if the manifests are replaced simultaneously
terminationGracePeriodSeconds: {{ nodelocaldns_secondary_skew_seconds }}
updateStrategy:
rollingUpdate:
maxUnavailable: {{ serial | default('20%') }}
type: RollingUpdate