Updating GUIDE.md

public-electrum-server/GUIDE.md

@@ -1,11 +1,10 @@
 # Public Bitcoin Electrum Server
 
-### Pre-amble
+### Introduction
 In this guide I will walk you through how you make your locally hosted Bitcoin Electrum Server accessible via the public domain without exposing your home IP address.
 
-### Requirements
-I used @k3tan's [Ministry of Nodes
-Guide](https://youtube.com/playlist?list=PLCRbH-IWlcW2A_kpx2XwAMgT0rcZEZ2Cg) 01 to 05 as the basis of my setup
+### Pre-requisites
+I used @k3tan's [Ministry of Nodes Guide](https://youtube.com/playlist?list=PLCRbH-IWlcW2A_kpx2XwAMgT0rcZEZ2Cg) 01 to 05 as the basis of my setup
 
 Setup a Local machine with +1TB SSD:
 - [UNB22 - 01 - Overview](https://youtu.be/9Kb7TobTNPI)
@@ -22,3 +21,49 @@ Setup Fulcrum Server OR ElectrumX Server on Local machine:
 In addition to the above you will also need a VPS:
 - [Host4Coins](https://host4coins.net/)
 - [1984Hosting](https://1984.hosting/)
+
+### Local Machine Setup
+
+This guide assumes you have a local machine running Debian-based Linux Distro with a fully sync-ed Bitcoin Node and Bitcoin indexer either ElectrumX or Fulcrum (ElectRS is another option ElectrumX is many times faster than this).
+
+The way we are going to expose our Bitcoin indexer to the public is via a [Reverse SSH tunnel](https://youtu.be/N8f5zv9UUMI) from our local machine to a VPS.
+
+This [guide](https://openoms.github.io/bitcoin-tutorials/ssh_tunnel.html) from @openoms covers some of this but not specifically from the perspective of tunnelling your Electrum Server.
+
+You should have [ssh keys setup](https://www.cyberciti.biz/faq/how-to-set-up-ssh-keys-on-linux-unix/) and copied over to your VPS. For this ssh tunnel daemon to work smoothly you will need ssh keys without a passphrase.
+
+First install autossh which is a wrapper on ssh:
+```
+sudo apt-get update
+sudo apt-get upgrade
+sudo apt-get install autossh
+```
+
+Then create a `.service` file to run your ssh tunnel daemon:
+```
+sudo vim /etc/systemd/system/ssh-tunnel.service
+```
+
+Here is a template of this `.service` file:
+```
+[Unit]
+Description=Remote SSH tunnel for multiple TCP applications
+After=network.target
+
+[Service]
+User=statue
+Group=statue
+Environment="AUTOSSH_GATETIME=0"
+ExecStart=/usr/bin/autossh -C -M 0 -v -N -o "ServerAliveInterval=60" -R <remote_port>:localhost:50001 <VPS-username>@<VPS-ip-or-domain>
+Restart=always
+RestartSec=60
+StandardOutput=journal
+
+[Install]
+WantedBy=multi-user.target
+```
+
+The port you are tunneling should be the regular TCP port 50001 and not the SSL
+port 50002. This is because on the VPS we will be using your cert and key from
+your Electrum server to apply SSL via nginx when exposing the data to the
+public.