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396 lines
9.8 KiB
Markdown
396 lines
9.8 KiB
Markdown
# Setting up ExternalDNS using the same domain for public and private Route53 zones
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This tutorial describes how to setup ExternalDNS using the same domain for public and private Route53 zones and [nginx-ingress-controller](https://github.com/kubernetes/ingress-nginx). It also outlines how to use [cert-manager](https://github.com/jetstack/cert-manager) to automatically issue SSL certificates from [Let's Encrypt](https://letsencrypt.org/) for both public and private records.
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## Deploy public nginx-ingress-controller
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Consult [External DNS nginx ingress docs](nginx-ingress.md) for installation guidelines.
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Specify `ingress-class` in nginx-ingress-controller container args:
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```yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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app: external-ingress
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name: external-ingress-controller
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: external-ingress
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template:
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metadata:
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labels:
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app: external-ingress
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spec:
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containers:
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- args:
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- /nginx-ingress-controller
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- --default-backend-service=$(POD_NAMESPACE)/default-http-backend
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- --configmap=$(POD_NAMESPACE)/external-ingress-configuration
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- --tcp-services-configmap=$(POD_NAMESPACE)/external-tcp-services
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- --udp-services-configmap=$(POD_NAMESPACE)/external-udp-services
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- --annotations-prefix=nginx.ingress.kubernetes.io
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- --ingress-class=external-ingress
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- --publish-service=$(POD_NAMESPACE)/external-ingress
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env:
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- name: POD_NAME
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valueFrom:
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fieldRef:
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apiVersion: v1
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fieldPath: metadata.name
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- name: POD_NAMESPACE
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valueFrom:
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fieldRef:
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apiVersion: v1
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fieldPath: metadata.namespace
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image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.11.0
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livenessProbe:
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failureThreshold: 3
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httpGet:
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path: /healthz
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port: 10254
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scheme: HTTP
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initialDelaySeconds: 10
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periodSeconds: 10
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successThreshold: 1
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timeoutSeconds: 1
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name: external-ingress-controller
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ports:
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- containerPort: 80
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name: http
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protocol: TCP
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- containerPort: 443
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name: https
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protocol: TCP
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readinessProbe:
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failureThreshold: 3
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httpGet:
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path: /healthz
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port: 10254
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scheme: HTTP
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periodSeconds: 10
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successThreshold: 1
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timeoutSeconds: 1
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```
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Set `type: LoadBalancer` in your public nginx-ingress-controller Service definition.
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```yaml
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apiVersion: v1
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kind: Service
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metadata:
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annotations:
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service.beta.kubernetes.io/aws-load-balancer-connection-idle-timeout: "3600"
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service.beta.kubernetes.io/aws-load-balancer-proxy-protocol: '*'
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labels:
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app: external-ingress
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name: external-ingress
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spec:
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externalTrafficPolicy: Cluster
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ports:
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- name: http
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port: 80
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protocol: TCP
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targetPort: http
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- name: https
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port: 443
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protocol: TCP
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targetPort: https
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selector:
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app: external-ingress
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sessionAffinity: None
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type: LoadBalancer
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```
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## Deploy private nginx-ingress-controller
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Consult [External DNS nginx ingress docs](nginx-ingress.md) for installation guidelines.
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Make sure to specify `ingress-class` in nginx-ingress-controller container args:
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```yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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app: internal-ingress
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name: internal-ingress-controller
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: internal-ingress
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template:
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metadata:
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labels:
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app: internal-ingress
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spec:
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containers:
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- args:
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- /nginx-ingress-controller
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- --default-backend-service=$(POD_NAMESPACE)/default-http-backend
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- --configmap=$(POD_NAMESPACE)/internal-ingress-configuration
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- --tcp-services-configmap=$(POD_NAMESPACE)/internal-tcp-services
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- --udp-services-configmap=$(POD_NAMESPACE)/internal-udp-services
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- --annotations-prefix=nginx.ingress.kubernetes.io
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- --ingress-class=internal-ingress
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- --publish-service=$(POD_NAMESPACE)/internal-ingress
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env:
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- name: POD_NAME
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valueFrom:
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fieldRef:
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apiVersion: v1
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fieldPath: metadata.name
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- name: POD_NAMESPACE
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valueFrom:
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fieldRef:
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apiVersion: v1
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fieldPath: metadata.namespace
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image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.11.0
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livenessProbe:
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failureThreshold: 3
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httpGet:
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path: /healthz
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port: 10254
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scheme: HTTP
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initialDelaySeconds: 10
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periodSeconds: 10
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successThreshold: 1
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timeoutSeconds: 1
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name: internal-ingress-controller
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ports:
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- containerPort: 80
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name: http
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protocol: TCP
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- containerPort: 443
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name: https
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protocol: TCP
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readinessProbe:
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failureThreshold: 3
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httpGet:
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path: /healthz
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port: 10254
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scheme: HTTP
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periodSeconds: 10
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successThreshold: 1
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timeoutSeconds: 1
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```
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Set additional annotations in your private nginx-ingress-controller Service definition to create an internal load balancer.
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```yaml
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apiVersion: v1
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kind: Service
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metadata:
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annotations:
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service.beta.kubernetes.io/aws-load-balancer-connection-idle-timeout: "3600"
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service.beta.kubernetes.io/aws-load-balancer-internal: 0.0.0.0/0
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service.beta.kubernetes.io/aws-load-balancer-proxy-protocol: '*'
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labels:
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app: internal-ingress
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name: internal-ingress
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spec:
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externalTrafficPolicy: Cluster
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ports:
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- name: http
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port: 80
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protocol: TCP
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targetPort: http
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- name: https
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port: 443
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protocol: TCP
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targetPort: https
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selector:
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app: internal-ingress
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sessionAffinity: None
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type: LoadBalancer
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```
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## Deploy the public zone ExternalDNS
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Consult [AWS ExternalDNS setup docs](aws.md) for installation guidelines.
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In ExternalDNS containers args, make sure to specify `aws-zone-type` and `ingress-class`:
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```yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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app: external-dns-public
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name: external-dns-public
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namespace: kube-system
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: external-dns-public
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strategy:
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type: Recreate
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template:
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metadata:
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labels:
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app: external-dns-public
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spec:
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containers:
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- args:
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- --source=ingress
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- --provider=aws
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- --registry=txt
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- --txt-owner-id=external-dns
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- --ingress-class=external-ingress
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- --aws-zone-type=public
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image: registry.k8s.io/external-dns/external-dns:v0.14.2
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name: external-dns-public
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```
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## Deploy the private zone ExternalDNS
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Consult [AWS ExternalDNS setup docs](aws.md) for installation guidelines.
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In ExternalDNS containers args, make sure to specify `aws-zone-type` and `ingress-class`:
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```yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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app: external-dns-private
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name: external-dns-private
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namespace: kube-system
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: external-dns-private
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strategy:
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type: Recreate
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template:
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metadata:
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labels:
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app: external-dns-private
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spec:
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containers:
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- args:
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- --source=ingress
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- --provider=aws
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- --registry=txt
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- --txt-owner-id=dev.k8s.nexus
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- --ingress-class=internal-ingress
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- --aws-zone-type=private
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image: registry.k8s.io/external-dns/external-dns:v0.14.2
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name: external-dns-private
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```
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## Create application Service definitions
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For this setup to work, you need to create two Ingress definitions for your application.
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At first, create a public Ingress definition:
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```yaml
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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labels:
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app: app
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name: app-public
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spec:
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ingressClassName: external-ingress
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rules:
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- host: app.domain.com
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http:
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paths:
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- backend:
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service:
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name: app
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port:
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number: 80
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pathType: Prefix
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```
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Then create a private Ingress definition:
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```yaml
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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labels:
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app: app
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name: app-private
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spec:
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ingressClassName: internal-ingress
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rules:
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- host: app.domain.com
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http:
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paths:
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- backend:
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service:
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name: app
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port:
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number: 80
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pathType: Prefix
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```
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Additionally, you may leverage [cert-manager](https://github.com/jetstack/cert-manager) to automatically issue SSL certificates from [Let's Encrypt](https://letsencrypt.org/). To do that, request a certificate in public service definition:
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```yaml
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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annotations:
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certmanager.k8s.io/acme-challenge-type: "dns01"
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certmanager.k8s.io/acme-dns01-provider: "route53"
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certmanager.k8s.io/cluster-issuer: "letsencrypt-production"
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kubernetes.io/tls-acme: "true"
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labels:
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app: app
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name: app-public
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spec:
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ingressClassName: "external-ingress"
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rules:
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- host: app.domain.com
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http:
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paths:
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- backend:
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service:
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name: app
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port:
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number: 80
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pathType: Prefix
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tls:
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- hosts:
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- app.domain.com
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secretName: app-tls
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```
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And reuse the requested certificate in private Service definition:
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```yaml
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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labels:
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app: app
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name: app-private
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spec:
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ingressClassName: "internal-ingress"
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rules:
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- host: app.domain.com
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http:
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paths:
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- backend:
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service:
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name: app
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port:
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number: 80
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pathType: Prefix
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tls:
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- hosts:
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- app.domain.com
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secretName: app-tls
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```
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