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sshtunnel

An absolute horrorshow - a Docker container that encapsulates an SSH tunnel.

My eyes! Why!?

Well... I need a poor-man's VPN whose only job is to expose a port on my internal Kubernetes cluster to the outside world, via a machine hosted in the cloud.

What?

Basically, I don't want to expose my home IP address to the Intarwebs as a server, and I don't want to fiddle around with Dynamic DNS either. This solves both - I have a tiny VM image on AWS that is just an endpoint for the SSH tunnel, and use port-forwarding to forward the port I want made public back to my cluster.

How To Use

With shame.

No, really

You need to provide the following environment variables:

Variable Value/Meaning
REMOTEHOST The remote machine to log in to
USER The username to log in to the remote host with
LISTENPORT The port the remote machine should listen for connections on
HOST The local host connections should be forwarded to
PORT The port on the local host to forward to

You will also need to provide an SSH client certificate in /usr/local/tunnel/cert/clientcert.pem. You can do this using either a Volume mount or by extending the Docker image and copying a certificate into place.

I want to do the bad thing on Kubernetes

Create a Secret with your certificate in, something like this:

apiVersion: v1
kind: Secret
metadata:
  name: tunnel-secret
type: Opaque
stringData:
  clientcert.pem: |
    -----BEGIN RSA PRIVATE KEY-----
    /// INSERT PRIVATE KEY HERE ///
    -----END RSA PRIVATE KEY-----

Then you can make a deployment with the sshtunnel container that looks something like this:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: tunnel
  labels:
    app: sshtunnel
spec:
  replicas: 1
  selector:
    matchLabels:
      app: sshtunnel
  template:
    metadata:
      labels:
        app: sshtunnel
    spec:
      containers:
      - name: sshtunnel
        image: snowgoons/sshtunnel:latest
        env:
        - name: REMOTEHOST
          value: "myremotehost"
        - name: USER
          value: "myusername"
        - name: LISTENPORT
          value: "1234"
        - name: HOST
          value: "mylocalendpoint"
        - name: PORT
          value: "1234"
        volumeMounts:
        - name: clientcert
          mountPath: "/usr/local/tunnel/cert"
          readOnly: true
      volumes:
      - name: clientcert
        secret:
          secretName: tunnel-secret