docs/config/kubernetes/production/deployments/webapp.yaml at 8bc92ba905415d1ea3579bc1b6df2eee271a6303 · github/docs · GitHub

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apiVersion: apps/v1
kind: Deployment
metadata:
  name: webapp
spec:
  replicas: 4
  selector:
    matchLabels:
      app: webapp
  template:
    metadata:
      labels:
        app: webapp
      annotations:
        # Our internal logs aren't structured so we use logfmt_sloppy to just log stdout and error
        # See https://thehub.github.com/epd/engineering/dev-practicals/observability/logging/ for more details
        fluentbit.io/parser: logfmt_sloppy
        observability.github.com/splunk_index: docs-internal
    spec:
      dnsPolicy: Default
      containers:
        - name: webapp
          image: docs-internal
          resources:
            requests:
              cpu: 4000m
              # Absolute minimum to start app is 1000m
              # Node is single-threaded but we want more CPUs
              # for OS and image resizing, and other binary executions
              # Better to increase replicas or memory than CPU
              memory: 8Gi
              # Absolute minimum to start app is 4500Mi
              # Would increase with more pages, versions, or languages supported
              # The additional memory helps during traffic surges
            limits:
              cpu: 16000m
              memory: 16Gi
          ports:
            - name: http
              containerPort: 4000
              protocol: TCP
          envFrom:
            - secretRef:
                name: vault-secrets
            - configMapRef:
                name: kube-cluster-metadata
            # application-config is created at deploy time from
            # configuration set in config/moda/configuration/*/env.yaml
            - configMapRef:
                name: application-config
          # Zero-downtime deploys
          # https://thehub.github.com/engineering/products-and-services/internal/moda/feature-documentation/pod-lifecycle/#required-prestop-hook
          # https://kubernetes.io/docs/concepts/containers/container-lifecycle-hooks/#container-hooks
          lifecycle:
            preStop:
              exec:
                command: ['sleep', '5']
          readinessProbe:
            initialDelaySeconds: 5
            httpGet:
              # WARNING: This should be updated to a meaningful endpoint for your application which will return a 200 once the app is fully started.
              # See: https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/#define-readiness-probes
              path: /healthcheck
              port: http