ngrok.service

[Unit]
Description=Share local port(s) with ngrok
After=syslog.target network.target

[Service]
PrivateTmp=true
Type=simple
Restart=always
RestartSec=1min
StandardOutput=null
StandardError=null
ExecStart=/opt/ngrok/ngrok start --config /opt/ngrok/ngrok.yml --all
ExecStop=/usr/bin/killall ngrok

[Install]
WantedBy=multi-user.target

ngrok.yml

authtoken:
region: eu
json_resolver_url: ""
dns_resolver_ips: []
console_ui: false
log_level: info
log_format: logfmt
log: /opt/ngrok/ngrok.log
web_addr: localhost:4040
update: false
tunnels:
  ssh:
    addr: 22
    proto: tcp

update.sh

#!/bin/bash

# https://tinyurl.com/w-tunnels

GIST_FILENAME='w-tunnels.json'

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
cd $DIR

set -ex

TMPFILE=$(mktemp)
echo '$GIST_FILENAME_RUBY =' \'${GIST_FILENAME}\' >> $TMPFILE
cat <<-RUBY >> $TMPFILE

require 'open-uri'
require 'json'

tunnels = JSON.parse(open('http://localhost:4040/api/tunnels').read)
tunnels.merge!(updated_at: Time.now.utc.to_s)
IO.write(\$GIST_FILENAME_RUBY, JSON.pretty_generate(tunnels))

RUBY

ruby ${TMPFILE}
rm ${TMPFILE}

git add -u
git commit --allow-empty-message -m ''
git checkout --orphan new-master master
git commit --allow-empty-message -m ''
git branch -M new-master master
git push -f
git gc

w-tunnels.json

{
  "tunnels": [
    {
      "name": "ssh",
      "uri": "/api/tunnels/ssh",
      "public_url": "tcp://0.tcp.eu.ngrok.io:16858",
      "proto": "tcp",
      "config": {
        "addr": "localhost:22",
        "inspect": false
      },
      "metrics": {
        "conns": {
          "count": 4,
          "gauge": 0,
          "rate1": 9.52852247585503e-196,
          "rate5": 7.486761581971751e-42,
          "rate15": 1.4551065405658382e-16,
          "p50": 316628573733,
          "p90": 600102170608,
          "p95": 600102170608,
          "p99": 600102170608
        },
        "http": {
          "count": 0,
          "rate1": 0,
          "rate5": 0,
          "rate15": 0,
          "p50": 0,
          "p90": 0,
          "p95": 0,
          "p99": 0
        }
      }
    }
  ],
  "uri": "/api/tunnels",
  "updated_at": "2019-01-18 18:35:01 UTC"
}