Notify on boot

Sometimes its handy to send a notification on boot, for example to send the IP address that the server has.

This script uses discord to send a message.

1. Install dependencies

   sudo apt install -y jq
   

2. Install discord.sh

   cd /usr/local/bin
   sudo curl -L -O https://github.com/fieu/discord.sh/releases/download/v2.0.0/discord.sh
   sudo chmod +x discord.sh
   

3. Create a boot-notify.sh script to send a message

   /opt/boot-notify.sh

   IP=$(hostname -I | awk '{print $1}')
   WEBHOOK_URL=<https://discord.com/api/webhooks/<webhook-url>>
   
   discord.sh \
   --webhook-url="$WEBHOOK_URL" \
   --username="server" \
   --text="server booted with IP $IP"
   

   sudo chmod u+x /opt/boot-notify.sh
   

4. Create a boot-notify systemd task that runs after networking has started

   /etc/systemd/system/boot-notify.service

   [Unit]
   Description=Sends a message over discord at startup
   After=network-online.target
   
   [Service]
   Type=simple
   ExecStart=/bin/bash /opt/boot-notify.sh
   
   [Install]
   WantedBy=multi-user.target
   

5. Test the systemd service

   sudo systemctl daemon-reload
   sudo systemctl start boot-notify
   

   Then verify the message is received

6. Enable the systemd service

   sudo systemctl enable boot-notify
   

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Last update: August 12, 2023
Created: June 3, 2023