Initial code

Signed-off-by: Julien Riou <julien@riou.xyz>

README.md

@@ -1,2 +1,58 @@
 # notify-by-telegram
-Send Nagios notifications to a Telegram channel
+Send Nagios notifications to a Telegram channel.
+
+
+## Telegram bot
+
+This [tutorial](https://takersplace.de/2019/12/19/telegram-notifications-with-nagios/) explains how to create a Telegram bot. You'll need the *chat_id* and *auth_key* for the next section.
+
+## Installation
+
+_This guide has been written for [Debian](https://www.debian.org/). Some commands might slightly change depending on your distribution._
+
+Clone the repository:
+```
+git clone https://github.com/jouir/notify-by-telegram.git
+sudo cp -p notify-by-telegram.py /usr/lib/nagios/plugins/notify-by-telegram.py
+sudo chmod 755 /usr/lib/nagios/plugins/notify-by-telegram.py
+sudo chown root:root /usr/lib/nagios/plugins/notify-by-telegram.py
+```
+
+Install dependencies using the package manager:
+```
+sudo apt install python3-jinja2 python3-requests
+```
+
+## Configuration
+
+Copy and update the configuration file example:
+```
+sudo cp -p config.json.example /etc/nagios/telegram.json
+sudo chmod 640 root:nagios /etc/nagios/telegram.json
+```
+
+Add Nagios configurations:
+```
+sudo cp -p nagios.cfg /etc/nagios4/conf.d/telegram.cfg
+```
+
+Ensure Nagios reads the configuration file:
+```
+grep cfg_dir=/etc/nagios4/conf.d /etc/nagios4/nagios.cfg
+```
+
+Then reload service:
+```
+systemctl reload nagios4
+```
+
+## Logs
+
+Errors logs can be set with the `--logfile` argument.
+
+Example:
+```
+tail -f /var/log/nagios4/telegram.log
+```
+
+Log level can be raised using `--verbose` or even more with `--debug` arguments.