039205560a
* nodelocaldns: allow a secondary pod for nodelocaldns for local-HA * CI: add job to test nodelocaldns secondary
103 lines
3.2 KiB
Django/Jinja
103 lines
3.2 KiB
Django/Jinja
apiVersion: apps/v1
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kind: DaemonSet
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metadata:
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name: nodelocaldns-second
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namespace: kube-system
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labels:
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k8s-app: kube-dns
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addonmanager.kubernetes.io/mode: Reconcile
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spec:
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selector:
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matchLabels:
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k8s-app: nodelocaldns-second
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template:
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metadata:
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labels:
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k8s-app: nodelocaldns-second
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annotations:
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prometheus.io/scrape: 'true'
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prometheus.io/port: '{{ nodelocaldns_secondary_prometheus_port }}'
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spec:
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nodeSelector:
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{{ nodelocaldns_ds_nodeselector }}
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priorityClassName: system-cluster-critical
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serviceAccountName: nodelocaldns
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hostNetwork: true
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dnsPolicy: Default # Don't use cluster DNS.
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tolerations:
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- effect: NoSchedule
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operator: "Exists"
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- effect: NoExecute
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operator: "Exists"
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containers:
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- name: node-cache
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image: "{{ nodelocaldns_image_repo }}:{{ nodelocaldns_image_tag }}"
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resources:
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limits:
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memory: {{ nodelocaldns_memory_limit }}
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requests:
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cpu: {{ nodelocaldns_cpu_requests }}
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memory: {{ nodelocaldns_memory_requests }}
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args: [ "-localip", "{{ nodelocaldns_ip }}", "-conf", "/etc/coredns/Corefile", "-upstreamsvc", "coredns", "-skipteardown" ]
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securityContext:
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privileged: true
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{% if nodelocaldns_bind_metrics_host_ip %}
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env:
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- name: MY_HOST_IP
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valueFrom:
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fieldRef:
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fieldPath: status.hostIP
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{% endif %}
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livenessProbe:
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httpGet:
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host: {{ nodelocaldns_ip }}
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path: /health
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port: {{ nodelocaldns_health_port }}
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scheme: HTTP
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 10
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readinessProbe:
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httpGet:
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host: {{ nodelocaldns_ip }}
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path: /health
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port: {{ nodelocaldns_health_port }}
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scheme: HTTP
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 10
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volumeMounts:
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- name: config-volume
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mountPath: /etc/coredns
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- name: xtables-lock
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mountPath: /run/xtables.lock
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lifecycle:
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preStop:
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exec:
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command:
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- sh
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- -c
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- sleep {{ nodelocaldns_secondary_skew_seconds }} && kill -9 1
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volumes:
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- name: config-volume
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configMap:
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name: nodelocaldns
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items:
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- key: Corefile-second
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path: Corefile
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{% if dns_etchosts | default(None) %}
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- key: hosts
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path: hosts
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{% endif %}
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- name: xtables-lock
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hostPath:
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path: /run/xtables.lock
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type: FileOrCreate
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# Implement a time skew between the main nodelocaldns and this secondary.
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# Since the two nodelocaldns instances share the :53 port, we want to keep
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# at least one running at any time enven if the manifests are replaced simultaneously
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terminationGracePeriodSeconds: {{ nodelocaldns_secondary_skew_seconds }}
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updateStrategy:
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rollingUpdate:
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maxUnavailable: {{ serial | default('20%') }}
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type: RollingUpdate
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