Telecry

A simple Elixir script to notify of a GCE spot instance preemption event via Telegram bot API token.

Use

The mix escript.build output is used as a standalone shutdown script to be applied to a Compute Engine instance's shutdown-script metadata. This is not intended to be used as a normal Elixir package.

The script makes the following assumptions:

1. The secrets TG_TOKEN and TG_TARGET_ID exist in the file /run/secrets/tg/nixiumbot. You will very likely need to redefine @secrets_path in lib/telecry/cli.ex.

2. The format for the secrets file is:

TG_TOKEN=your-tg-token-here
TG_TARGET_ID=target-id-to-send-message-to

3. The resulting script output from MIX_ENV=prod mix escript.build is going to be larger than Google's allowed local limit of 256KB, so you will need to either copy the script to the server manually and target it's local path directly (e.g., metadata.shutdown-script = #! /path/to/escript /path/to/telecry)

Alternatively, you should be able to copy it to a bucket and use metadata.shutdown-script-url.