ingress-nginx: Upgrade to 0.21.0 (#3789)

Upstream Changes:

  - ingress-nginx 0.21.0 (https://github.com/kubernetes/ingress-nginx/releases/tag/nginx-0.21.0)

Our Changes:

  - Sync templates with upstream changes
  - Remove --default-backend-service requirement. Use the flag only for custom default backends

roles/kubernetes-apps/ingress_controller/ingress_nginx/tasks/main.yml

@@ -32,7 +32,6 @@
   set_fact:
     ingress_nginx_templates:
       - { name: 00-namespace, file: 00-namespace.yml, type: ns }
-      - { name: deploy-default-backend, file: deploy-default-backend.yml, type: deploy }
       - { name: svc-default-backend, file: svc-default-backend.yml, type: svc }
       - { name: cm-ingress-nginx, file: cm-ingress-nginx.yml, type: cm }
       - { name: cm-tcp-services, file: cm-tcp-services.yml, type: cm }

roles/kubernetes-apps/ingress_controller/ingress_nginx/templates/deploy-default-backend.yml.j2

@@ -1,49 +0,0 @@
----
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: default-backend
-  namespace: {{ ingress_nginx_namespace }}
-  labels:
-    app.kubernetes.io/name: default-backend
-    app.kubernetes.io/part-of: ingress-nginx
-spec:
-  replicas: 1
-  selector:
-    matchLabels:
-      app.kubernetes.io/name: default-backend
-      app.kubernetes.io/part-of: ingress-nginx
-  template:
-    metadata:
-      labels:
-        app.kubernetes.io/name: default-backend
-        app.kubernetes.io/part-of: ingress-nginx
-    spec:
-{% if kube_version is version('v1.11.1', '>=') %}
-      priorityClassName: {% if ingress_nginx_namespace == 'kube-system' %}system-cluster-critical{% else %}k8s-cluster-critical{% endif %}{{''}}
-{% endif %}
-      terminationGracePeriodSeconds: 60
-      containers:
-        - name: default-backend
-          # Any image is permissible as long as:
-          # 1. It serves a 404 page at /
-          # 2. It serves 200 on a /healthz endpoint
-          image: {{ ingress_nginx_default_backend_image_repo }}:{{ ingress_nginx_default_backend_image_tag }}
-          livenessProbe:
-            httpGet:
-              path: /healthz
-              port: 8080
-              scheme: HTTP
-            initialDelaySeconds: 30
-            timeoutSeconds: 5
-          ports:
-            - containerPort: 8080
-          resources:
-            limits:
-              cpu: 10m
-              memory: 20Mi
-            requests:
-              cpu: 10m
-              memory: 20Mi
-      nodeSelector:
-        beta.kubernetes.io/os: linux

roles/kubernetes-apps/ingress_controller/ingress_nginx/templates/ds-ingress-nginx-controller.yml.j2

@@ -42,7 +42,6 @@ spec:
           imagePullPolicy: {{ k8s_image_pull_policy }}
           args:
             - /nginx-ingress-controller
-            - --default-backend-service=$(POD_NAMESPACE)/default-backend
             - --configmap=$(POD_NAMESPACE)/ingress-nginx
             - --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
             - --udp-services-configmap=$(POD_NAMESPACE)/udp-services