webhook.yaml

# 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: devel
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: devel
    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: ko://knative.dev/serving/cmd/webhook

        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

        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:
          <<: *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

---
apiVersion: v1
kind: Service
metadata:
  labels:
    role: webhook
    serving.knative.dev/release: devel
  name: webhook
  namespace: knative-serving
spec:
  ports:
  # Define metrics and profiling for them to be accessible within service meshes.
  - name: http-metrics
    port: 9090
    targetPort: 9090
  - name: http-profiling
    port: 8008
    targetPort: 8008
  - name: https-webhook
    port: 443
    targetPort: 8443
  selector:
    role: webhook