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Syncthing on K8s

Syncthing is an open source sync tool between different devices, it is free to use, and point to point sharing service.

syncthing screenshot in dark mode

The K8s Deployment File for Syncthing

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: syncthing-pv-claim
  labels:
    app: syncthing
spec:
  storageClassName: local-path
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: syncthing
  labels:
    app: syncthing
spec:
  replicas: 1
  selector:
    matchLabels:
      app: syncthing
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: syncthing
    spec:
      nodeSelector:
        kubernetes.io/arch: arm64
        persistant-prefered: '1'
      containers:
      - image: syncthing/syncthing:1.18
        name: syncthing
        resources:
          limits:
            memory: "256Mi"
            cpu: "500m"
        ports:
        - containerPort: 8384
          name: syncthing
          protocol: TCP
        - containerPort: 22000
          protocol: TCP
          name: to-listen
        - containerPort: 22000
          protocol: UDP
          name: to-discover
        volumeMounts:
        - name: syncthing-persistent-storage
          mountPath: /var/syncthing
      volumes:
      - name: syncthing-persistent-storage
        persistentVolumeClaim:
          claimName: syncthing-pv-claim

---
apiVersion: v1
kind: Service
metadata:
  name: syncthing-service
  labels:
    app: syncthing
spec:
  ports:
    - name: http
      port: 32080
      targetPort: 8384
      protocol: TCP
    - protocol: TCP
      port: 32000
      targetPort: 22000
      name: to-listen
    - protocol: UDP
      port: 32000
      targetPort: 22000
      name: to-discover
  selector:
    app: syncthing
  type: NodePort
# if we use NodePort here so custom port, such as 22000, 8383 will be exposed through 32000 and 32080 at instance ip
# we cannot use cluster ip only here because it will not expose the ports https://stackoverflow.com/questions/41509439/whats-the-difference-between-clusterip-nodeport-and-loadbalancer-service-types
# we need to enable the ports in firewall to support syncthing if use cluster ip

Why Use NodePort as Service Type in K8s Config?

Here we use NodePort for the service type, instead of ClusterIP, the reason is that Syncthing requires some specific port for connection, and it needs a volume to store the data. There is a hack to make it use ClusterIP and binding ingress and domain, let me know in comments if you prefer using a domain name and ClusterIP instead of IP address + Node Port.

P.S. Solution Based On Syncthing

  • KeePass + Syncthing, as a password maanger.
    • How to make it in short:
      1. Syncthing supports encryption, (i.e. use a remote syncthing instance as an untrudsted device)
      2. Put keepass db into a shared folder, but not the key
      3. Manually copy the key across devices
      4. Now you will have a self hosted password manager across as many devices as you want
  • Syncthing can be used as a back-up service
  • More about syncthing
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