axion1337.chat-gitops/apps/production/coturn.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: coturn-config
  namespace: matrix
data:
  turnserver.conf: |
    # TURN Server configuration
    realm=axion1337.chat

    # Listen ports
    listening-port=3478
    listening-ip=0.0.0.0
    alt-listening-port=5349
    alt-listening-ip=0.0.0.0

    # External IPs (for clients behind NAT)
    relay-ip=49.13.132.245
    external-ip=49.13.132.245

    # Relay port range
    min-bps=0
    bps-capacity=0

    # Authentication
    use-auth-secret
    static-auth-secret=$TURN_SECRET

    # HTTPS/TLS
    cert=/etc/coturn/tls/tls.crt
    pkey=/etc/coturn/tls/tls.key

    # Performance tuning
    max-bps=0
    bps-capacity=0
    log-file=stdout

    # Logging
    verbose
---
apiVersion: v1
kind: Service
metadata:
  name: coturn
  namespace: matrix
spec:
  type: ClusterIP
  ports:
    - name: stun-udp
      port: 3478
      protocol: UDP
    - name: stun-tcp
      port: 3478
      protocol: TCP
    - name: turns-tcp
      port: 5349
      protocol: TCP
  selector:
    app: coturn
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: coturn
  namespace: matrix
spec:
  replicas: 1
  # hostNetwork pods bind directly to the node's ports (3478/5349) - on this single-node
  # cluster, RollingUpdate's default "bring up the new pod before removing the old one"
  # can never schedule (port conflict). Recreate kills the old pod first.
  # Note: switching to Recreate on an existing Deployment that already had the
  # RollingUpdate defaults recorded required a one-time manual
  # `kubectl patch --type=merge -p '{"spec":{"strategy":{"rollingUpdate":null,"type":"Recreate"}}}'`
  # (2026-07-28) - a YAML `rollingUpdate: null` in this file is dropped before reaching the
  # API server (client-side omits null keys) rather than sent as an explicit field deletion,
  # so it can't clear an already-set field on its own.
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: coturn
  template:
    metadata:
      labels:
        app: coturn
      annotations:
        prometheus.io/scrape: "false"
        # Bumped on every TURN_SECRET rotation (Issue #38) to force a new pod, since
        # Kubernetes doesn't restart running pods when a referenced Secret's content
        # changes and the initContainer that reads it only runs once at pod start.
        rotated-at: "2026-08-01T02:00:01Z"
    spec:
      hostNetwork: true
      dnsPolicy: ClusterFirstWithHostNet
      initContainers:
      - name: init-config
        # Gepinnt und aktuell gehalten (#0052); 1.36 ist die im Repo bereits
        # anderswo genutzte Version — ein Stand statt zwei.
        image: busybox:1.36
        command:
        - sh
        - -c
        - |
          TURN_SECRET=$(cat /etc/coturn-secret/TURN_SECRET)
          sed "s|\$TURN_SECRET|$TURN_SECRET|g" /etc/coturn-template/turnserver.conf > /etc/coturn/turnserver.conf
          chmod 644 /etc/coturn/turnserver.conf
        resources:
          limits:
            cpu: 100m
            memory: 64Mi
          requests:
            cpu: 50m
            memory: 32Mi
        volumeMounts:
        - name: config-template
          mountPath: /etc/coturn-template
        - name: config
          mountPath: /etc/coturn
        - name: secret
          mountPath: /etc/coturn-secret
          readOnly: true
      containers:
      - name: coturn
        # Gepinnt statt ':latest' (#0052). Vorher lief hier 4.10.0, waehrend ':latest'
        # laengst auf 4.17.2 zeigte: mit imagePullPolicy IfNotPresent haelt der Node das
        # einmal gezogene Image fest, und der naechste Pod-Neustart auf einem frischen
        # Node waere still ueber sieben Minor-Versionen gesprungen. Genau deshalb ist
        # ':latest' weder reproduzierbar noch sinnvoll scanbar.
        image: coturn/coturn:4.17.2
        imagePullPolicy: IfNotPresent
        ports:
        - name: stun-udp
          containerPort: 3478
          protocol: UDP
        - name: stun-tcp
          containerPort: 3478
          protocol: TCP
        - name: turns-tcp
          containerPort: 5349
          protocol: TCP
        volumeMounts:
        - name: config
          mountPath: /etc/coturn
        - name: tls
          mountPath: /etc/coturn/tls
          readOnly: true
        resources:
          limits:
            cpu: 500m
            memory: 256Mi
          requests:
            cpu: 100m
            memory: 128Mi
        livenessProbe:
          tcpSocket:
            port: 3478
          initialDelaySeconds: 30
          periodSeconds: 10
      volumes:
      - name: config
        emptyDir: {}
      - name: config-template
        configMap:
          name: coturn-config
      - name: secret
        secret:
          secretName: coturn-secret
          defaultMode: 0400
      - name: tls
        secret:
          secretName: turn-axion1337-chat-tls
      affinity:
        nodeAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 100
            preference:
              matchExpressions:
              - key: kubernetes.io/hostname
                operator: In
                values:
                - matrix