# Copyright 2018 The Knative Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: webhook
  namespace: knative-serving
  labels:
    serving.knative.dev/release: "v0.19.0"
spec:
  selector:
    matchLabels:
      app: webhook
      role: webhook
  template:
    metadata:
      annotations:
        cluster-autoscaler.kubernetes.io/safe-to-evict: "false"
      labels:
        app: webhook
        role: webhook
        serving.knative.dev/release: "v0.19.0"
    spec:
      # To avoid node becoming SPOF, spread our replicas to different nodes.
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - podAffinityTerm:
                labelSelector:
                  matchLabels:
                    app: webhook
                topologyKey: kubernetes.io/hostname
              weight: 100
      serviceAccountName: controller
      containers:
        - name: webhook
          # This is the Go import path for the binary that is containerized
          # and substituted here.
          image: gcr.io/knative-releases/knative.dev/serving/cmd/webhook@sha256:d27b4495ccc304d5a921d847dd1bce82bd2664ce3e5625b57758ebad03542b5f
          resources:
            requests:
              cpu: 100m
              memory: 100Mi
            limits:
              cpu: 500m
              memory: 500Mi
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: SYSTEM_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: CONFIG_LOGGING_NAME
              value: config-logging
            - name: CONFIG_OBSERVABILITY_NAME
              value: config-observability
            - name: WEBHOOK_PORT
              value: "8443"
            # TODO(https://github.com/knative/pkg/pull/953): Remove stackdriver specific config
            - name: METRICS_DOMAIN
              value: knative.dev/serving
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsNonRoot: true
            capabilities:
              drop:
                - all
          ports:
            - name: metrics
              containerPort: 9090
            - name: profiling
              containerPort: 8008
            - name: https-webhook
              containerPort: 8443
          readinessProbe: &probe
            periodSeconds: 1
            httpGet:
              scheme: HTTPS
              port: 8443
              httpHeaders:
                - name: k-kubelet-probe
                  value: "webhook"
          livenessProbe:
            !!merge <<: *probe
            failureThreshold: 6
            initialDelaySeconds: 20
      # Our webhook should gracefully terminate by lame ducking first, set this to a sufficiently
      # high value that we respect whatever value it has configured for the lame duck grace period.
      terminationGracePeriodSeconds: 300