Add SSH-Tunnel-Quick-Setup.md

SSH-Tunnel-Quick-Setup.md

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+## Generate SSH Key
+
+```sh
+ssh-keygen -t ed25519 -C "khairul169"
+cat .ssh/id_ed25519.pub
+```
+
+## Add SSH Public Key to the server
+```sh
+ssh root@hostname
+mkdir .ssh
+nano .ssh/authorized_keys
+```
+
+## Test SSH Connection
+```sh
+ssh root@hostname -i .ssh/id_ed25519
+```
+
+## Install AutoSSH
+```sh
+sudo apt install autossh -y
+```
+
+## Create Tunnel Script
+
+`sudo nano /etc/ssh-tunnel.sh`
+```sh
+#!/bin/sh
+
+SSH_KEY="/root/.ssh/id_ed25519"
+SRC_PORT=80
+SRC_HOST=localhost
+DEST_PORT=8081
+
+autossh -M 0 root@hostname -R "$DEST_PORT:$SRC_HOST:$SRC_PORT" -i $SSH_KEY -N -o "StrictHostKeyChecking no" -o "ServerAliveInterval 60" -o "ServerAliveCountMax 3" -o "ExitOnForwardFailure yes"
+```
+
+`sudo chmod +x /etc/ssh-tunnel.sh`
+
+## Create & Enable Systemd Service
+`sudo nano /etc/systemd/system/sshtunnel.service`
+```
+[Unit]
+Description=AutoSSH tunnel service to My SSH Tunnel Server
+
+[Service]
+Environment="AUTOSSH_GATETIME=0"
+ExecStart=/etc/ssh-tunnel.sh
+Restart=on-failure
+RestartSec=10
+TimeoutSec=10
+
+[Install]
+WantedBy=default.target
+```
+
+```sh
+sudo systemctl daemon-reload
+sudo systemctl enable --now sshtunnel
+sudo systemctl status sshtunnel
+```