Use this script at your OWN risk!
The purpose of this script is to guard validator node against appearance of another validator node with same key and to prevent double signing. This may happen if main validator node goes offline because of problems on provider side, and you need to start another one but if first validator appears online again it will lead to double signing if seconds validator will not be shut down.
Supported operation systems: Debian, Ubuntu
It is recommended to disable node autostart to prevent accidental node startup.
Script runs every minute and checks specific port (26656 by default) on the remote system. And when it sees that this port become available it performs "Shutdown command" command from root user.
Please do not forget to remove this script from root user cronjob after node will be shutted down. And do not forget to remove validator key from the system after that.
In order to install all required tools simply issue following command:
$ bash <(curl -s https://raw.githubusercontent.com/Distributed-Validators-Synctems/validator-online-guard/master/setup.sh)
In order to receive notifications about operation result please copy included notification.sh.sample into directory with config.sh and name it notification.sh. After that please provide correct values for TELEGRAM_CHAT_ID and TELEGRAM_BOT_TOKEN variables inside notification.sh.