Step 1: Place ngrok in /opt/ngrok/.
Step 2: Get authtoken from ngrok website, then add it to /opt/ngrok/ngrok.yml.
Step 3. Modify your own configrations in /opt/ngrok/ngrok.yml.
Step 4: Add ngrok.service to /lib/systemd/system/.
Step 5: Start ngrok service by typing:
systemctl enable ngrok.service
systemctl start ngrok.service
or just execute install.sh on Linux x64 platform.
curl -O https://raw.githubusercontent.com/hmahadik/systemd-ngrok/master/install.sh
chmod +x install.sh
sudo ./install.sh <your_authtoken>