wes-audio-server.yaml

apiVersion: v1
kind: Service
metadata:
  name: wes-audio-server
spec:
  selector:
    app: wes-audio-server
  ports:
    - name: pulseaudio
      protocol: TCP
      port: 4713
      targetPort: 4713
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: wes-audio-server
spec:
  selector:
    matchLabels:
      app: wes-audio-server
  template:
    metadata:
      labels:
        app: wes-audio-server
    spec:
      priorityClassName: wes-high-priority
      nodeSelector:
        resource.microphone: "true"
      containers:
        - name: wes-audio-server
          image: waggle/wes-audio-server:0.3.0
          imagePullPolicy: IfNotPresent
          resources:
            limits:
              memory: 20Mi
            requests:
              cpu: 200m
              memory: 20Mi
          ports:
            - containerPort: 4713
          securityContext:
            privileged: true
          # NOTE The main purpose of this service is the multiplex the usb microphone
          # so I use a liveness probe to tie the health of this service to whether a
          # usb microphone is available.
          #
          # NOTE I am *not* using a readiness probe because I haven't found a way to
          # get kuberetes to "hand off" ownership of the mic when updating the service.
          # Basically, Kubernetes uses a readiness probe to decide when a Pod is ready
          # to receive traffic. During an update it does a swicth:
          #
          #       /[A]
          #  [svc]
          #        [B waiting for readiness probe...]
          #
          #        [A terminating...]
          #  [svc]
          #       \[B ready!]
          #
          # Unfortunately, if "A" is kept alive in this case, it holds onto the mic causing
          # it to appear busy. This may not be a big deal, but I just wanted to document how
          # what's usually the right behavior affects this service a little differently.
          livenessProbe:
            exec:
              command:
                - "/bin/sh"
                - "-c"
                - "pactl list sources | grep -q 'USB Audio'"
            initialDelaySeconds: 5
            periodSeconds: 5
            failureThreshold: 1
# TODO(sean) use device plugin to run on all devices with microphones
---
# NOTE this configmap will be mounted into plugins at /etc/asound.conf by runplugin
# so they expect a pulseaudio backend.
apiVersion: v1
kind: ConfigMap
metadata:
  name: wes-audio-server-plugin-conf
data:
  asound.conf: |
    pcm.pulse {
        type pulse
    }
    ctl.pulse {
        type pulse
    }
    pcm.!default {
        type pulse
    }
    ctl.!default {
        type pulse
    }